add diagonal infinite scrolling card mosaic background

Reviewed-on: #13

.claude/settings.local.json

@@ -1,11 +1,15 @@
 {
+  "permissions": {
+    "allow": [
+      "mcp__supabase__apply_migration",
+      "mcp__supabase__list_tables",
+      "mcp__supabase__execute_sql",
+      "Bash(npm run build:*)",
+      "mcp__supabase__get_advisors"
+    ]
+  },
   "enableAllProjectMcpServers": true,
   "enabledMcpjsonServers": [
     "supabase"
-  ],
-  "permissions": {
-    "allow": [
-      "mcp__supabase__apply_migration"
-    ]
-  }
+  ]
 }

dev-dist/sw.js

@@ -82,7 +82,7 @@ define(['./workbox-ca84f546'], (function (workbox) { 'use strict';
     "revision": "3ca0b8505b4bec776b69afdba2768812"
   }, {
     "url": "index.html",
-    "revision": "0.ufhads5pjvs"
+    "revision": "0.vigoqq958cg"
   }], {});
   workbox.cleanupOutdatedCaches();
   workbox.registerRoute(new workbox.NavigationRoute(workbox.createHandlerBoundToURL("index.html"), {

src/App.tsx

@@ -11,6 +11,7 @@ import Community from './components/Community';
 import PWAInstallPrompt from './components/PWAInstallPrompt';
 import { AuthProvider, useAuth } from './contexts/AuthContext';
 import { ToastProvider } from './contexts/ToastContext';
+import CardMosaicBackground from "./components/CardMosaicBackground.tsx";
 
 type Page = 'home' | 'deck' | 'login' | 'collection' | 'edit-deck' | 'search' | 'life-counter' | 'community';
 
@@ -40,7 +41,7 @@ function AppContent() {
     switch (currentPage) {
       case 'home':
         return (
-          <div className="relative bg-gray-900 text-white p-3 sm:p-6 animate-fade-in md:min-h-screen">
+          <div className="relative  text-white p-3 sm:p-6 animate-fade-in md:min-h-screen">
             <div className="max-w-7xl mx-auto">
               <h1 className="text-2xl md:text-3xl font-bold mb-4 md:mb-6 animate-slide-in-left">My Decks</h1>
               <DeckList
@@ -78,9 +79,12 @@ function AppContent() {
   };
 
   return (
-    <div className="min-h-screen bg-gray-900 flex flex-col">
+    <div className="min-h-screen bg-gray-900 flex flex-col relative">
+      {/* Animated card mosaic overlay */}
+      <CardMosaicBackground />
+
       <Navigation currentPage={currentPage} setCurrentPage={setCurrentPage} />
-      <main className="relative flex-1 overflow-y-auto">
+      <main className="relative flex-1 overflow-y-auto z-20">
         <div className="relative min-h-full md:min-h-0 pt-0 md:pt-16 pb-20 md:pb-0">
           {renderPage()}
         </div>

src/components/CardMosaicBackground.tsx

@@ -0,0 +1,155 @@
+import React, { useEffect, useState, useRef } from 'react';
+import { getRandomCards } from '../services/api';
+import { Card } from '../types';
+
+export default function CardMosaicBackground() {
+  const [cards, setCards] = useState<Card[]>([]);
+  const [offset, setOffset] = useState({ x: 0, y: 0 });
+  const animationRef = useRef<number>();
+
+  // Grid configuration - large grid to cover entire screen
+  const cardsPerRow = 18;
+  const cardsPerCol = 15;
+  // Spacing adjusted for card transforms: w-64 = 256px
+  // With rotateZ(15deg) and rotateX(60deg), cards need more space
+  const cardWidth = 130; // Horizontal spacing to avoid overlap
+  const cardHeight = 85; // Vertical spacing to avoid overlap
+  const gridWidth = cardsPerRow * cardWidth;
+  const gridHeight = cardsPerCol * cardHeight;
+
+  useEffect(() => {
+    const fetchCards = async () => {
+      try {
+        // Fetch enough cards for one grid
+        const totalCards = cardsPerRow * cardsPerCol;
+        const randomCards = await getRandomCards(totalCards);
+        setCards(randomCards);
+      } catch (error) {
+        console.error('Error fetching background cards:', error);
+      }
+    };
+
+    fetchCards();
+  }, []);
+
+  // Diagonal infinite scroll animation
+  useEffect(() => {
+    if (cards.length === 0) return;
+
+    const speed = 0.5; // Pixels per frame (diagonal speed)
+    let lastTime = Date.now();
+
+    const animate = () => {
+      const now = Date.now();
+      const delta = now - lastTime;
+      lastTime = now;
+
+      setOffset((prev) => {
+        // Move diagonally: right and up
+        let newX = prev.x + (speed * delta) / 16;
+        let newY = prev.y - (speed * delta) / 16;
+
+        // Loop seamlessly when we've moved one full grid
+        if (newX >= gridWidth) newX = newX % gridWidth;
+        if (newY <= -gridHeight) newY = newY % gridHeight;
+
+        return { x: newX, y: newY };
+      });
+
+      animationRef.current = requestAnimationFrame(animate);
+    };
+
+    animationRef.current = requestAnimationFrame(animate);
+
+    return () => {
+      if (animationRef.current) {
+        cancelAnimationFrame(animationRef.current);
+      }
+    };
+  }, [cards.length, gridWidth, gridHeight]);
+
+  if (cards.length === 0) return null;
+
+  // Render the card grid (will be duplicated 4 times for infinite effect)
+  const renderGrid = (offsetX: number, offsetY: number, key: string) => (
+    <div
+      key={key}
+      className="absolute"
+      style={{
+        left: `${offsetX}px`,
+        top: `${offsetY}px`,
+        width: `${gridWidth}px`,
+        height: `${gridHeight}px`,
+        perspective: '2000px', // Apply perspective to parent for uniform card sizes
+        transformStyle: 'preserve-3d',
+      }}
+    >
+      {cards.map((card, index) => {
+        const col = index % cardsPerRow;
+        const row = Math.floor(index / cardsPerRow);
+
+        return (
+          <div
+            key={`${key}-${card.id}-${index}`}
+            className="absolute"
+            style={{
+              left: `${col * cardWidth}px`,
+              top: `${row * cardHeight}px`,
+              transform: `
+                perspective(1000px)
+                rotateX(60deg)
+                rotateY(5deg)
+                rotateZ(15deg)
+              `,
+              opacity: 1.0, // Full opacity - gradient overlay handles the fade
+            }}
+          >
+            <img
+              src={card.image_uris?.normal || card.image_uris?.large}
+              alt=""
+              className="w-64 h-auto rounded-lg shadow-2xl"
+              draggable={false}
+            />
+          </div>
+        );
+      })}
+    </div>
+  );
+
+  return (
+    <div className="fixed inset-0 overflow-hidden pointer-events-none z-10">
+      {/* Scrolling grid container */}
+      <div
+        className="absolute"
+        style={{
+          transform: `translate(${offset.x}px, ${offset.y}px)`,
+          willChange: 'transform',
+        }}
+      >
+        {/* Duplicate grids in 2x2 pattern for seamless infinite scroll */}
+        {/* Position grids to cover entire viewport and beyond */}
+        {renderGrid(-gridWidth, window.innerHeight - gridHeight / 2, 'grid-tl')}
+        {renderGrid(0, window.innerHeight - gridHeight / 2, 'grid-tr')}
+        {renderGrid(-gridWidth, window.innerHeight - gridHeight / 2 + gridHeight, 'grid-bl')}
+        {renderGrid(0, window.innerHeight - gridHeight / 2 + gridHeight, 'grid-br')}
+      </div>
+
+      {/* Fixed gradient overlay - cards pass UNDER and fade naturally */}
+      <div
+        className="absolute inset-0 pointer-events-none z-10"
+        style={{
+          background: `
+            linear-gradient(to top,
+              transparent 0%,
+              transparent 25%,
+              rgba(3, 7, 18, 0.3) 40%,
+              rgba(3, 7, 18, 0.6) 55%,
+              rgba(3, 7, 18, 0.85) 70%,
+              rgb(3, 7, 18) 85%
+            )
+          `
+        }}
+      />
+    </div>
+  );
+}

src/components/CardSearch.tsx

@@ -201,7 +201,7 @@ const CardSearch = () => {
   };
 
   return (
-    <div className="relative bg-gray-900 text-white p-3 sm:p-6 md:min-h-screen">
+    <div className="relative text-white p-3 sm:p-6 md:min-h-screen">
       <div className="max-w-7xl mx-auto">
         <h1 className="text-2xl md:text-3xl font-bold mb-4 md:mb-6">Card Search</h1>
         <form onSubmit={handleSearch} className="mb-8 space-y-4">

src/components/Collection.tsx

@@ -1,17 +1,25 @@
-import React, { useState, useEffect } from 'react';
+import React, { useState, useEffect, useRef, useCallback } from 'react';
 import { Search, Loader2, Trash2, CheckCircle, XCircle, RefreshCw, Plus, Minus, X } from 'lucide-react';
 import { Card } from '../types';
-import { getUserCollection, getCardsByIds, addCardToCollection } from '../services/api';
+import { getUserCollectionPaginated, getCardsByIds, addCardToCollection, getCollectionTotalValue } from '../services/api';
 import { useAuth } from '../contexts/AuthContext';
 import { supabase } from '../lib/supabase';
 import ConfirmModal from './ConfirmModal';
 
+const PAGE_SIZE = 50;
+
 export default function Collection() {
   const { user } = useAuth();
   const [searchQuery, setSearchQuery] = useState('');
   const [collection, setCollection] = useState<{ card: Card; quantity: number }[]>([]);
   const [filteredCollection, setFilteredCollection] = useState<{ card: Card; quantity: number }[]>([]);
   const [isLoadingCollection, setIsLoadingCollection] = useState(true);
+  const [isLoadingMore, setIsLoadingMore] = useState(false);
+  const [hasMore, setHasMore] = useState(false);
+  const [offset, setOffset] = useState(0);
+  const [totalCount, setTotalCount] = useState(0);
+  const [totalCollectionValue, setTotalCollectionValue] = useState<number>(0);
+  const [isLoadingTotalValue, setIsLoadingTotalValue] = useState(true);
   const [hoveredCard, setHoveredCard] = useState<Card | null>(null);
   const [selectedCard, setSelectedCard] = useState<{ card: Card; quantity: number } | null>(null);
   const [cardFaceIndex, setCardFaceIndex] = useState<Map<string, number>>(new Map());
@@ -22,6 +30,7 @@ export default function Collection() {
     cardId: string;
     cardName: string;
   }>({ isOpen: false, cardId: '', cardName: '' });
+  const observerTarget = useRef<HTMLDivElement>(null);
 
   // Helper function to check if a card has an actual back face (not adventure/split/etc)
   const isDoubleFaced = (card: Card) => {
@@ -62,6 +71,58 @@ export default function Collection() {
     });
   };
 
+  // Calculate total collection value (lightweight query from database)
+  useEffect(() => {
+    const calculateTotalValue = async () => {
+      if (!user) {
+        setIsLoadingTotalValue(false);
+        return;
+      }
+
+      try {
+        setIsLoadingTotalValue(true);
+        // Get total value directly from database (no need to fetch all cards!)
+        const totalValue = await getCollectionTotalValue(user.id);
+        setTotalCollectionValue(totalValue);
+      } catch (error) {
+        console.error('Error calculating total collection value:', error);
+        setTotalCollectionValue(0);
+      } finally {
+        setIsLoadingTotalValue(false);
+      }
+    };
+
+    calculateTotalValue();
+  }, [user]);
+
+  // Subscribe to realtime updates for collection total value
+  useEffect(() => {
+    if (!user) return;
+
+    const profileChannel = supabase
+      .channel('profile-total-value-changes')
+      .on(
+        'postgres_changes',
+        {
+          event: 'UPDATE',
+          schema: 'public',
+          table: 'profiles',
+          filter: `id=eq.${user.id}`,
+        },
+        (payload: any) => {
+          if (payload.new?.collection_total_value !== undefined) {
+            console.log('Collection total value updated:', payload.new.collection_total_value);
+            setTotalCollectionValue(payload.new.collection_total_value);
+          }
+        }
+      )
+      .subscribe();
+
+    return () => {
+      supabase.removeChannel(profileChannel);
+    };
+  }, [user]);
+
   // Load user's collection from Supabase on mount
   useEffect(() => {
     const loadCollection = async () => {
@@ -72,26 +133,33 @@ export default function Collection() {
 
       try {
         setIsLoadingCollection(true);
-        // Get collection from Supabase (returns Map<card_id, quantity>)
-        const collectionMap = await getUserCollection(user.id);
+        setOffset(0);
+        setCollection([]);
 
-        if (collectionMap.size === 0) {
+        // Get paginated collection from Supabase
+        const result = await getUserCollectionPaginated(user.id, PAGE_SIZE, 0);
+        setTotalCount(result.totalCount);
+        setHasMore(result.hasMore);
+
+        if (result.items.size === 0) {
           setCollection([]);
+          setFilteredCollection([]);
           return;
         }
 
-        // Get the actual card data from Scryfall for all cards in collection
-        const cardIds = Array.from(collectionMap.keys());
+        // Get the actual card data from Scryfall for all cards in this page
+        const cardIds = Array.from(result.items.keys());
         const cards = await getCardsByIds(cardIds);
 
         // Combine card data with quantities
         const collectionWithCards = cards.map(card => ({
           card,
-          quantity: collectionMap.get(card.id) || 0,
+          quantity: result.items.get(card.id) || 0,
         }));
 
         setCollection(collectionWithCards);
         setFilteredCollection(collectionWithCards);
+        setOffset(PAGE_SIZE);
       } catch (error) {
         console.error('Error loading collection:', error);
         setSnackbar({ message: 'Failed to load collection', type: 'error' });
@@ -103,6 +171,70 @@ export default function Collection() {
     loadCollection();
   }, [user]);
 
+  // Load more cards for infinite scroll
+  const loadMoreCards = useCallback(async () => {
+    if (!user || isLoadingMore || !hasMore) return;
+
+    try {
+      setIsLoadingMore(true);
+
+      // Get next page of collection
+      const result = await getUserCollectionPaginated(user.id, PAGE_SIZE, offset);
+      setHasMore(result.hasMore);
+
+      if (result.items.size === 0) {
+        return;
+      }
+
+      // Get card data from Scryfall
+      const cardIds = Array.from(result.items.keys());
+      const cards = await getCardsByIds(cardIds);
+
+      // Combine card data with quantities
+      const newCards = cards.map(card => ({
+        card,
+        quantity: result.items.get(card.id) || 0,
+      }));
+
+      // Deduplicate: only add cards that aren't already in the collection
+      setCollection(prev => {
+        const existingIds = new Set(prev.map(item => item.card.id));
+        const uniqueNewCards = newCards.filter(item => !existingIds.has(item.card.id));
+        return [...prev, ...uniqueNewCards];
+      });
+
+      setOffset(prev => prev + PAGE_SIZE);
+    } catch (error) {
+      console.error('Error loading more cards:', error);
+      setSnackbar({ message: 'Failed to load more cards', type: 'error' });
+    } finally {
+      setIsLoadingMore(false);
+    }
+  }, [user, offset, hasMore, isLoadingMore]);
+
+  // Intersection Observer for infinite scroll
+  useEffect(() => {
+    const observer = new IntersectionObserver(
+      (entries) => {
+        if (entries[0].isIntersecting && hasMore && !isLoadingMore) {
+          loadMoreCards();
+        }
+      },
+      { threshold: 0.1 }
+    );
+
+    const currentTarget = observerTarget.current;
+    if (currentTarget) {
+      observer.observe(currentTarget);
+    }
+
+    return () => {
+      if (currentTarget) {
+        observer.unobserve(currentTarget);
+      }
+    };
+  }, [hasMore, isLoadingMore, loadMoreCards]);
+
   // Filter collection based on search query
   useEffect(() => {
     if (!searchQuery.trim()) {
@@ -189,7 +321,7 @@ export default function Collection() {
   };
 
   return (
-    <div className="relative bg-gray-900 text-white p-3 sm:p-6 md:min-h-screen">
+    <div className="relative text-white p-3 sm:p-6 md:min-h-screen">
       <div className="max-w-7xl mx-auto">
         <h1 className="text-2xl md:text-3xl font-bold mb-4 md:mb-6">My Collection</h1>
 
@@ -209,9 +341,31 @@ export default function Collection() {
 
         {/* Collection */}
         <div>
-          <h2 className="text-xl font-semibold mb-4">
-            {searchQuery ? `Found ${filteredCollection.length} card(s)` : `My Cards (${collection.length} unique, ${collection.reduce((acc, c) => acc + c.quantity, 0)} total)`}
-          </h2>
+          <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-2 mb-4">
+            <h2 className="text-xl font-semibold">
+              {searchQuery ? `Found ${filteredCollection.length} card(s)` : `My Cards (${collection.length} unique, ${collection.reduce((acc, c) => acc + c.quantity, 0)} total)`}
+            </h2>
+            {/* Collection Value Summary */}
+            <div className="bg-gray-800 border border-gray-700 rounded-lg px-4 py-2">
+              <div className="text-xs text-gray-400 mb-0.5">
+                {searchQuery ? 'Filtered Value' : 'Total Collection Value'}
+              </div>
+              <div className="text-lg font-bold text-green-400">
+                {isLoadingTotalValue ? (
+                  <Loader2 className="animate-spin" size={20} />
+                ) : searchQuery ? (
+                  // For search results, calculate from filtered collection
+                  `$${filteredCollection.reduce((total, { card, quantity }) => {
+                    const price = card.prices?.usd ? parseFloat(card.prices.usd) : 0;
+                    return total + (price * quantity);
+                  }, 0).toFixed(2)}`
+                ) : (
+                  // For full collection, use pre-calculated total
+                  `$${totalCollectionValue.toFixed(2)}`
+                )}
+              </div>
+            </div>
+          </div>
 
           {isLoadingCollection ? (
             <div className="flex items-center justify-center py-12">
@@ -255,6 +409,12 @@ export default function Collection() {
                       <div className="absolute top-1 right-1 bg-blue-600 text-white text-xs sm:text-sm font-bold px-2 py-1 rounded-full shadow-lg">
                         x{quantity}
                       </div>
+                      {/* Price badge */}
+                      {card.prices?.usd && (
+                        <div className="absolute bottom-1 left-1 bg-green-600 text-white text-[10px] sm:text-xs font-bold px-1.5 py-0.5 rounded shadow-lg">
+                          ${card.prices.usd}
+                        </div>
+                      )}
                       {/* Flip button for double-faced cards */}
                       {isMultiFaced && (
                         <button
@@ -279,6 +439,25 @@ export default function Collection() {
               })}
             </div>
           )}
+
+          {/* Infinite scroll loading indicator */}
+          {!searchQuery && isLoadingMore && (
+            <div className="flex justify-center py-8">
+              <Loader2 className="animate-spin text-blue-500" size={32} />
+            </div>
+          )}
+
+          {/* Observer target for infinite scroll */}
+          {!searchQuery && hasMore && !isLoadingMore && (
+            <div ref={observerTarget} className="h-20" />
+          )}
+
+          {/* End of collection indicator */}
+          {!searchQuery && !hasMore && collection.length > 0 && (
+            <div className="text-center py-8 text-gray-500 text-sm">
+              End of collection • {totalCount} total cards
+            </div>
+          )}
         </div>
       </div>
 

src/components/DeckList.tsx

@@ -77,7 +77,7 @@ const DeckList = ({ onDeckEdit, onCreateDeck }: DeckListProps) => {
       {/* Create New Deck Card */}
       <button
         onClick={onCreateDeck}
-        className="bg-gray-800 rounded-lg overflow-hidden shadow-lg hover:shadow-xl border-2 border-dashed border-gray-600 hover:border-blue-500 transition-all duration-300 hover:scale-105 cursor-pointer group aspect-[5/7] flex flex-col items-center justify-center gap-3 p-4"
+        className="rounded-lg overflow-hidden shadow-lg hover:shadow-xl border-2 border-dashed border-gray-600 hover:border-blue-500 transition-all duration-300 hover:scale-105 cursor-pointer group aspect-[5/7] flex flex-col items-center justify-center gap-3 p-4"
       >
         <PlusCircle size={48} className="text-gray-600 group-hover:text-blue-500 transition-colors" />
         <div className="text-center">

src/components/TradeCreator.tsx

@@ -3,7 +3,7 @@ import { X, ArrowLeftRight, ArrowRight, ArrowLeft, Minus, Send, Gift, Loader2, S
 import { useAuth } from '../contexts/AuthContext';
 import { useToast } from '../contexts/ToastContext';
 import { getUserCollection, getCardsByIds } from '../services/api';
-import { createTrade } from '../services/tradesService';
+import { createTrade, updateTrade } from '../services/tradesService';
 import { Card } from '../types';
 
 interface CollectionItem {
@@ -182,6 +182,11 @@ interface TradeCreatorProps {
   receiverCollection: CollectionItem[];
   onClose: () => void;
   onTradeCreated: () => void;
+  editMode?: boolean;
+  existingTradeId?: string;
+  initialSenderCards?: Card[];
+  initialReceiverCards?: Card[];
+  initialMessage?: string;
 }
 
 type MobileStep = 'want' | 'give' | 'review';
@@ -192,13 +197,18 @@ export default function TradeCreator({
   receiverCollection,
   onClose,
   onTradeCreated,
+  editMode = false,
+  existingTradeId,
+  initialSenderCards = [],
+  initialReceiverCards = [],
+  initialMessage = '',
 }: TradeCreatorProps) {
   const { user } = useAuth();
   const toast = useToast();
   const [myCollection, setMyCollection] = useState<CollectionItem[]>([]);
   const [loading, setLoading] = useState(true);
   const [submitting, setSubmitting] = useState(false);
-  const [message, setMessage] = useState('');
+  const [message, setMessage] = useState(initialMessage);
 
   const [isGiftMode, setIsGiftMode] = useState(false);
   const [mobileStep, setMobileStep] = useState<MobileStep>('want');
@@ -222,6 +232,57 @@ export default function TradeCreator({
     }
   }, [isGiftMode]);
 
+  // Pre-populate cards in edit mode
+  useEffect(() => {
+    if (!editMode || !myCollection.length || !receiverCollection.length) return;
+    if (initialSenderCards.length === 0 && initialReceiverCards.length === 0) return;
+
+    console.log('Pre-populating cards', {
+      initialSenderCards: initialSenderCards.length,
+      initialReceiverCards: initialReceiverCards.length,
+      myCollection: myCollection.length,
+      receiverCollection: receiverCollection.length
+    });
+
+    // Pre-populate sender cards with their quantities
+    const senderMap = new Map<string, SelectedCard>();
+    initialSenderCards.forEach(card => {
+      const collectionItem = myCollection.find(c => c.card.id === card.id);
+      if (collectionItem) {
+        // Find the quantity from trade items if card has quantity property
+        const quantity = (card as any).quantity || 1;
+        console.log('Adding sender card:', card.name, 'qty:', quantity);
+        senderMap.set(card.id, {
+          card: card,
+          quantity: quantity,
+          maxQuantity: collectionItem.quantity,
+        });
+      } else {
+        console.log('Card not found in my collection:', card.name, card.id);
+      }
+    });
+    setMyOfferedCards(senderMap);
+
+    // Pre-populate receiver cards with their quantities
+    const receiverMap = new Map<string, SelectedCard>();
+    initialReceiverCards.forEach(card => {
+      const collectionItem = receiverCollection.find(c => c.card.id === card.id);
+      if (collectionItem) {
+        // Find the quantity from trade items if card has quantity property
+        const quantity = (card as any).quantity || 1;
+        console.log('Adding receiver card:', card.name, 'qty:', quantity);
+        receiverMap.set(card.id, {
+          card: card,
+          quantity: quantity,
+          maxQuantity: collectionItem.quantity,
+        });
+      } else {
+        console.log('Card not found in their collection:', card.name, card.id);
+      }
+    });
+    setWantedCards(receiverMap);
+  }, [editMode, myCollection, receiverCollection, initialSenderCards, initialReceiverCards]);
+
   const loadMyCollection = async () => {
     if (!user) return;
     setLoading(true);
@@ -314,28 +375,42 @@ export default function TradeCreator({
 
     setSubmitting(true);
     try {
-      const senderCards = Array.from(myOfferedCards.values()).map((item) => ({
+      const myCards = Array.from(myOfferedCards.values()).map((item) => ({
         cardId: item.card.id,
         quantity: item.quantity,
       }));
 
-      const receiverCards = Array.from(wantedCards.values()).map((item) => ({
+      const theirCards = Array.from(wantedCards.values()).map((item) => ({
         cardId: item.card.id,
         quantity: item.quantity,
       }));
 
-      await createTrade({
-        senderId: user.id,
-        receiverId,
-        message: message || undefined,
-        senderCards,
-        receiverCards,
-      });
+      if (editMode && existingTradeId) {
+        // Update existing trade
+        await updateTrade({
+          tradeId: existingTradeId,
+          editorId: user.id,
+          message: message || undefined,
+          myCards,
+          theirCards,
+        });
+        toast.success('Trade updated!');
+      } else {
+        // Create new trade
+        await createTrade({
+          user1Id: user.id,
+          user2Id: receiverId,
+          message: message || undefined,
+          user1Cards: myCards,
+          user2Cards: theirCards,
+        });
+        toast.success('Trade offer sent!');
+      }
 
       onTradeCreated();
     } catch (error) {
-      console.error('Error creating trade:', error);
-      toast.error('Failed to create trade');
+      console.error('Error with trade:', error);
+      toast.error(editMode ? 'Failed to update trade' : 'Failed to create trade');
     } finally {
       setSubmitting(false);
     }
@@ -487,12 +562,6 @@ export default function TradeCreator({
                     placeholder="Add a message..."
                     className="w-full px-3 py-2 bg-gray-700 border border-gray-600 rounded-lg text-sm focus:ring-2 focus:ring-blue-500 focus:border-transparent"
                   />
-                  {message && (
-                    <div className="mt-2 p-2 bg-gray-900/50 rounded border border-gray-700">
-                      <p className="text-xs text-gray-400 mb-1">Preview:</p>
-                      <p className="text-sm text-gray-200">{message}</p>
-                    </div>
-                  )}
                 </div>
               </div>
             )}
@@ -559,7 +628,7 @@ export default function TradeCreator({
           <div className="flex items-center justify-between p-4 border-b border-gray-700">
             <div className="flex items-center gap-3">
               <ArrowLeftRight size={24} className="text-blue-400" />
-              <h2 className="text-xl font-bold">Trade with {receiverUsername}</h2>
+              <h2 className="text-xl font-bold">{editMode ? 'Edit Trade' : `Trade with ${receiverUsername}`}</h2>
               <label className="flex items-center gap-2 ml-4 cursor-pointer">
                 <div
                   className={`relative w-10 h-5 rounded-full transition-colors ${
@@ -638,23 +707,14 @@ export default function TradeCreator({
               )}
             </div>
 
-            <div className="space-y-2 mb-4">
+            <div className="flex items-center gap-4 mb-4">
               <input
                 type="text"
                 value={message}
                 onChange={(e) => setMessage(e.target.value)}
                 placeholder="Add a message (optional)"
-                className="w-full px-4 py-2 bg-gray-700 border border-gray-600 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
+                className="flex-1 px-4 py-2 bg-gray-700 border border-gray-600 rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-transparent"
               />
-              {message && (
-                <div className="p-2 bg-gray-900/50 rounded border border-gray-700">
-                  <p className="text-xs text-gray-400 mb-1">Preview:</p>
-                  <p className="text-sm text-gray-200">{message}</p>
-                </div>
-              )}
-            </div>
-
-            <div className="flex items-center gap-4">
               <button
                 onClick={onClose}
                 className="px-4 py-2 bg-gray-700 hover:bg-gray-600 rounded-lg transition"

src/components/TradeDetail.tsx

@@ -1,17 +1,18 @@
 import React, { useState, useEffect } from 'react';
-import { X, Check, ArrowLeftRight, DollarSign, Loader2, RefreshCcw } from 'lucide-react';
+import { X, Check, ArrowLeftRight, DollarSign, Loader2, Edit, RefreshCcw, History, AlertTriangle } from 'lucide-react';
 import { useAuth } from '../contexts/AuthContext';
 import { useToast } from '../contexts/ToastContext';
-import { Trade, TradeItem } from '../services/tradesService';
+import { Trade, TradeHistoryEntry, getTradeVersionHistory } from '../services/tradesService';
+import { getUserCollection, getCardsByIds } from '../services/api';
 import { Card } from '../types';
-import { getCardsByIds } from '../services/api';
+import TradeCreator from './TradeCreator';
 
 interface TradeDetailProps {
   trade: Trade;
   onClose: () => void;
   onAccept: (tradeId: string) => Promise<void>;
   onDecline: (tradeId: string) => Promise<void>;
-  onCounterOffer: (trade: Trade, senderCards: Card[], receiverCards: Card[]) => void;
+  onTradeUpdated: () => void;
 }
 
 interface TradeCardItem {
@@ -19,6 +20,11 @@ interface TradeCardItem {
   quantity: number;
 }
 
+interface CollectionItem {
+  card: Card;
+  quantity: number;
+}
+
 function calculateTotalPrice(items: TradeCardItem[]): number {
   return items.reduce((total, { card, quantity }) => {
     const price = card.prices?.usd ? parseFloat(card.prices.usd) : 0;
@@ -31,7 +37,7 @@ export default function TradeDetail({
   onClose,
   onAccept,
   onDecline,
-  onCounterOffer,
+  onTradeUpdated,
 }: TradeDetailProps) {
   const { user } = useAuth();
   const toast = useToast();
@@ -39,13 +45,20 @@ export default function TradeDetail({
   const [processing, setProcessing] = useState(false);
   const [senderCards, setSenderCards] = useState<TradeCardItem[]>([]);
   const [receiverCards, setReceiverCards] = useState<TradeCardItem[]>([]);
+  const [showHistory, setShowHistory] = useState(false);
+  const [history, setHistory] = useState<TradeHistoryEntry[]>([]);
+  const [showEditMode, setShowEditMode] = useState(false);
+  const [editReceiverCollection, setEditReceiverCollection] = useState<CollectionItem[]>([]);
 
-  const isSender = trade.sender_id === user?.id;
-  const isReceiver = trade.receiver_id === user?.id;
-  const otherUser = isSender ? trade.receiver : trade.sender;
+  const isUser1 = trade.user1_id === user?.id;
+  const isUser2 = trade.user2_id === user?.id;
+  const otherUser = isUser1 ? trade.user2 : trade.user1;
+  const myUserId = user?.id || '';
+  const otherUserId = isUser1 ? trade.user2_id : trade.user1_id;
 
   useEffect(() => {
     loadTradeCards();
+    loadTradeHistory();
   }, [trade]);
 
   const loadTradeCards = async () => {
@@ -62,22 +75,22 @@ export default function TradeDetail({
       const cardMap = new Map<string, Card>();
       cards.forEach(card => cardMap.set(card.id, card));
 
-      const senderItems: TradeCardItem[] = [];
-      const receiverItems: TradeCardItem[] = [];
+      const myItems: TradeCardItem[] = [];
+      const theirItems: TradeCardItem[] = [];
 
       trade.items?.forEach(item => {
         const card = cardMap.get(item.card_id);
         if (!card) return;
 
-        if (item.owner_id === trade.sender_id) {
-          senderItems.push({ card, quantity: item.quantity });
+        if (item.owner_id === myUserId) {
+          myItems.push({ card, quantity: item.quantity });
         } else {
-          receiverItems.push({ card, quantity: item.quantity });
+          theirItems.push({ card, quantity: item.quantity });
         }
       });
 
-      setSenderCards(senderItems);
-      setReceiverCards(receiverItems);
+      setSenderCards(myItems);
+      setReceiverCards(theirItems);
     } catch (error) {
       console.error('Error loading trade cards:', error);
       toast.error('Failed to load trade details');
@@ -86,6 +99,15 @@ export default function TradeDetail({
     }
   };
 
+  const loadTradeHistory = async () => {
+    try {
+      const historyData = await getTradeVersionHistory(trade.id);
+      setHistory(historyData);
+    } catch (error) {
+      console.error('Error loading trade history:', error);
+    }
+  };
+
   const handleAccept = async () => {
     setProcessing(true);
     try {
@@ -110,20 +132,65 @@ export default function TradeDetail({
     }
   };
 
-  const handleCounterOffer = () => {
-    const senderCardsList = senderCards.map(item => item.card);
-    const receiverCardsList = receiverCards.map(item => item.card);
-    onCounterOffer(trade, senderCardsList, receiverCardsList);
-    onClose();
+  const handleEdit = async () => {
+    try {
+      // Load the other user's collection for editing
+      const collectionMap = await getUserCollection(otherUserId);
+      const cardIds = Array.from(collectionMap.keys());
+      const cards = await getCardsByIds(cardIds);
+      const collection = cards.map((card) => ({
+        card,
+        quantity: collectionMap.get(card.id) || 0,
+      }));
+
+      setEditReceiverCollection(collection);
+      setShowEditMode(true);
+    } catch (error) {
+      console.error('Error loading collection for edit:', error);
+      toast.error('Failed to load collection');
+    }
   };
 
-  const senderPrice = calculateTotalPrice(senderCards);
-  const receiverPrice = calculateTotalPrice(receiverCards);
+  // In the symmetric model, counter-offer is the same as edit
+  const handleCounterOffer = handleEdit;
 
-  const yourCards = isSender ? senderCards : receiverCards;
-  const theirCards = isSender ? receiverCards : senderCards;
-  const yourPrice = isSender ? senderPrice : receiverPrice;
-  const theirPrice = isSender ? receiverPrice : senderPrice;
+  // senderCards = myCards, receiverCards = theirCards (already calculated correctly)
+  const yourCards = senderCards;
+  const theirCards = receiverCards;
+  const yourPrice = calculateTotalPrice(yourCards);
+  const theirPrice = calculateTotalPrice(theirCards);
+
+  // For edit mode, pre-populate with current cards
+  // In the symmetric model, both edit and counter-offer use the same perspective:
+  // - Your cards (what you're offering)
+  // - Their cards (what you want)
+  // Include quantity in the card object so TradeCreator can preserve it
+  const editInitialSenderCards = yourCards.map(c => ({ ...c.card, quantity: c.quantity }));
+  const editInitialReceiverCards = theirCards.map(c => ({ ...c.card, quantity: c.quantity }));
+
+  if (showEditMode) {
+    return (
+      <TradeCreator
+        receiverId={otherUserId}
+        receiverUsername={otherUser?.username || 'User'}
+        receiverCollection={editReceiverCollection}
+        onClose={() => {
+          setShowEditMode(false);
+          onClose();
+        }}
+        onTradeCreated={() => {
+          setShowEditMode(false);
+          onTradeUpdated();
+          onClose();
+        }}
+        editMode={true}
+        existingTradeId={trade.id}
+        initialSenderCards={editInitialSenderCards}
+        initialReceiverCards={editInitialReceiverCards}
+        initialMessage={trade.message || ''}
+      />
+    );
+  }
 
   return (
     <div className="fixed inset-0 bg-black/80 backdrop-blur-sm z-50 flex items-end md:items-center justify-center p-0 md:p-4">
@@ -133,9 +200,9 @@ export default function TradeDetail({
           <div className="flex items-center gap-2">
             <ArrowLeftRight size={20} className="text-blue-400" />
             <div>
-              <h2 className="text-lg font-bold">Trade Details</h2>
+              <h2 className="text-lg font-bold">Trade Details {trade.version > 1 && `(v${trade.version})`}</h2>
               <p className="text-sm text-gray-400">
-                {isSender ? 'To' : 'From'}: {otherUser?.username}
+                With: {otherUser?.username}
               </p>
             </div>
           </div>
@@ -154,105 +221,150 @@ export default function TradeDetail({
               <Loader2 className="animate-spin text-blue-500" size={48} />
             </div>
           ) : (
-            <div className="grid grid-cols-1 lg:grid-cols-2 gap-4">
-              {/* Your Side */}
-              <div className="space-y-3">
-                <div className="flex items-center justify-between">
-                  <h3 className="font-semibold text-green-400">
-                    {isSender ? 'You Give' : 'You Receive'}
-                  </h3>
-                  <div className="flex items-center gap-1 text-green-400 text-sm">
-                    <DollarSign size={14} />
-                    {yourPrice.toFixed(2)}
+            <div className="space-y-4">
+              {/* Invalid Trade Warning */}
+              {trade.status === 'pending' && !trade.is_valid && (
+                <div className="bg-red-900/30 border border-red-600 rounded-lg p-3 flex items-start gap-2">
+                  <AlertTriangle size={20} className="text-red-400 flex-shrink-0 mt-0.5" />
+                  <div>
+                    <h4 className="font-semibold text-red-400 text-sm">Trade No Longer Valid</h4>
+                    <p className="text-red-200 text-xs mt-1">
+                      One or more cards in this trade are no longer available in the required quantities. This trade cannot be accepted until it is updated.
+                    </p>
                   </div>
                 </div>
-
-                {yourCards.length === 0 ? (
-                  <p className="text-gray-500 text-center py-8">Gift (no cards)</p>
-                ) : (
-                  <div className="grid grid-cols-3 sm:grid-cols-4 gap-2">
-                    {yourCards.map((item, idx) => (
-                      <div key={idx} className="relative rounded-lg overflow-hidden">
-                        <img
-                          src={item.card.image_uris?.small || item.card.image_uris?.normal}
-                          alt={item.card.name}
-                          className="w-full h-auto"
-                        />
-                        {item.quantity > 1 && (
-                          <div className="absolute top-1 right-1 bg-green-600 text-white text-xs px-1.5 py-0.5 rounded font-semibold">
-                            x{item.quantity}
-                          </div>
-                        )}
-                        {item.card.prices?.usd && (
-                          <div className="absolute bottom-1 left-1 bg-gray-900/90 text-white text-[10px] px-1 py-0.5 rounded">
-                            ${item.card.prices.usd}
-                          </div>
-                        )}
-                      </div>
-                    ))}
+              )}
+              <div className="grid grid-cols-1 lg:grid-cols-2 gap-4">
+                {/* Your Side */}
+                <div className="space-y-3">
+                  <div className="flex items-center justify-between">
+                    <h3 className="font-semibold text-green-400">
+                      You Give
+                    </h3>
+                    <div className="flex items-center gap-1 text-green-400 text-sm">
+                      <DollarSign size={14} />
+                      {yourPrice.toFixed(2)}
+                    </div>
                   </div>
-                )}
-              </div>
 
-              {/* Their Side */}
-              <div className="space-y-3">
-                <div className="flex items-center justify-between">
-                  <h3 className="font-semibold text-blue-400">
-                    {isSender ? 'You Receive' : 'They Give'}
-                  </h3>
-                  <div className="flex items-center gap-1 text-blue-400 text-sm">
-                    <DollarSign size={14} />
-                    {theirPrice.toFixed(2)}
-                  </div>
+                  {yourCards.length === 0 ? (
+                    <p className="text-gray-500 text-center py-8">Gift (no cards)</p>
+                  ) : (
+                    <div className="grid grid-cols-3 sm:grid-cols-4 gap-2">
+                      {yourCards.map((item, idx) => (
+                        <div key={idx} className="relative rounded-lg overflow-hidden">
+                          <img
+                            src={item.card.image_uris?.small || item.card.image_uris?.normal}
+                            alt={item.card.name}
+                            className="w-full h-auto"
+                          />
+                          {item.quantity > 1 && (
+                            <div className="absolute top-1 right-1 bg-green-600 text-white text-xs px-1.5 py-0.5 rounded font-semibold">
+                              x{item.quantity}
+                            </div>
+                          )}
+                          {item.card.prices?.usd && (
+                            <div className="absolute bottom-1 left-1 bg-gray-900/90 text-white text-[10px] px-1 py-0.5 rounded">
+                              ${item.card.prices.usd}
+                            </div>
+                          )}
+                        </div>
+                      ))}
+                    </div>
+                  )}
                 </div>
 
-                {theirCards.length === 0 ? (
-                  <p className="text-gray-500 text-center py-8">Gift (no cards)</p>
-                ) : (
-                  <div className="grid grid-cols-3 sm:grid-cols-4 gap-2">
-                    {theirCards.map((item, idx) => (
-                      <div key={idx} className="relative rounded-lg overflow-hidden">
-                        <img
-                          src={item.card.image_uris?.small || item.card.image_uris?.normal}
-                          alt={item.card.name}
-                          className="w-full h-auto"
-                        />
-                        {item.quantity > 1 && (
-                          <div className="absolute top-1 right-1 bg-blue-600 text-white text-xs px-1.5 py-0.5 rounded font-semibold">
-                            x{item.quantity}
-                          </div>
-                        )}
-                        {item.card.prices?.usd && (
-                          <div className="absolute bottom-1 left-1 bg-gray-900/90 text-white text-[10px] px-1 py-0.5 rounded">
-                            ${item.card.prices.usd}
-                          </div>
-                        )}
-                      </div>
-                    ))}
+                {/* Their Side */}
+                <div className="space-y-3">
+                  <div className="flex items-center justify-between">
+                    <h3 className="font-semibold text-blue-400">
+                      You Receive
+                    </h3>
+                    <div className="flex items-center gap-1 text-blue-400 text-sm">
+                      <DollarSign size={14} />
+                      {theirPrice.toFixed(2)}
+                    </div>
                   </div>
-                )}
-              </div>
-            </div>
-          )}
 
-          {/* Message */}
-          {trade.message && (
-            <div className="mt-4 p-3 bg-gray-800 rounded-lg">
-              <p className="text-sm text-gray-400 mb-1">Message:</p>
-              <p className="text-sm">{trade.message}</p>
-            </div>
-          )}
-
-          {/* Price Difference */}
-          {!loading && (senderPrice > 0 || receiverPrice > 0) && (
-            <div className="mt-4 p-3 bg-gray-800 rounded-lg">
-              <div className="flex items-center justify-between text-sm">
-                <span className="text-gray-400">Value Difference:</span>
-                <span className={Math.abs(senderPrice - receiverPrice) > 5 ? 'text-yellow-400' : 'text-gray-300'}>
-                  ${Math.abs(senderPrice - receiverPrice).toFixed(2)}
-                  {senderPrice > receiverPrice ? ' in your favor' : senderPrice < receiverPrice ? ' in their favor' : ' (balanced)'}
-                </span>
+                  {theirCards.length === 0 ? (
+                    <p className="text-gray-500 text-center py-8">Gift (no cards)</p>
+                  ) : (
+                    <div className="grid grid-cols-3 sm:grid-cols-4 gap-2">
+                      {theirCards.map((item, idx) => (
+                        <div key={idx} className="relative rounded-lg overflow-hidden">
+                          <img
+                            src={item.card.image_uris?.small || item.card.image_uris?.normal}
+                            alt={item.card.name}
+                            className="w-full h-auto"
+                          />
+                          {item.quantity > 1 && (
+                            <div className="absolute top-1 right-1 bg-blue-600 text-white text-xs px-1.5 py-0.5 rounded font-semibold">
+                              x{item.quantity}
+                            </div>
+                          )}
+                          {item.card.prices?.usd && (
+                            <div className="absolute bottom-1 left-1 bg-gray-900/90 text-white text-[10px] px-1 py-0.5 rounded">
+                              ${item.card.prices.usd}
+                            </div>
+                          )}
+                        </div>
+                      ))}
+                    </div>
+                  )}
+                </div>
               </div>
+
+              {/* Message */}
+              {trade.message && (
+                <div className="p-3 bg-gray-800 rounded-lg">
+                  <p className="text-sm text-gray-400 mb-1">Message:</p>
+                  <p className="text-sm">{trade.message}</p>
+                </div>
+              )}
+
+              {/* Price Difference */}
+              {!loading && (yourPrice > 0 || theirPrice > 0) && (
+                <div className="p-3 bg-gray-800 rounded-lg">
+                  <div className="flex items-center justify-between text-sm">
+                    <span className="text-gray-400">Value Difference:</span>
+                    <span className={Math.abs(yourPrice - theirPrice) > 5 ? 'text-yellow-400' : 'text-gray-300'}>
+                      ${Math.abs(yourPrice - theirPrice).toFixed(2)}
+                      {yourPrice > theirPrice ? ' in your favor' : yourPrice < theirPrice ? ' in their favor' : ' (balanced)'}
+                    </span>
+                  </div>
+                </div>
+              )}
+
+              {/* History */}
+              {history.length > 0 && (
+                <div>
+                  <button
+                    onClick={() => setShowHistory(!showHistory)}
+                    className="flex items-center gap-2 text-sm text-blue-400 hover:text-blue-300"
+                  >
+                    <History size={16} />
+                    {showHistory ? 'Hide' : 'Show'} History ({history.length} {history.length === 1 ? 'version' : 'versions'})
+                  </button>
+
+                  {showHistory && (
+                    <div className="mt-3 space-y-2">
+                      {history.map((entry) => (
+                        <div key={entry.id} className="p-3 bg-gray-800 rounded-lg text-sm">
+                          <div className="flex items-center justify-between mb-2">
+                            <span className="font-semibold text-purple-400">Version {entry.version}</span>
+                            <span className="text-gray-400 text-xs">
+                              Edited by {entry.editor?.username} • {new Date(entry.created_at).toLocaleDateString()}
+                            </span>
+                          </div>
+                          {entry.message && (
+                            <p className="text-gray-300 text-xs">{entry.message}</p>
+                          )}
+                        </div>
+                      ))}
+                    </div>
+                  )}
+                </div>
+              )}
             </div>
           )}
         </div>
@@ -260,13 +372,16 @@ export default function TradeDetail({
         {/* Actions - Only for pending trades */}
         {trade.status === 'pending' && !loading && (
           <div className="border-t border-gray-800 p-4 space-y-2">
-            {isReceiver ? (
+            {/* Only the user who DIDN'T make the last edit can respond */}
+            {trade.editor_id && trade.editor_id !== user?.id ? (
+              /* User receives the last edit - can accept/decline/counter */
               <>
                 <div className="flex gap-2">
                   <button
                     onClick={handleAccept}
-                    disabled={processing}
-                    className="flex-1 flex items-center justify-center gap-2 px-4 py-3 bg-green-600 hover:bg-green-700 disabled:bg-gray-600 rounded-lg font-medium transition"
+                    disabled={processing || !trade.is_valid}
+                    className="flex-1 flex items-center justify-center gap-2 px-4 py-3 bg-green-600 hover:bg-green-700 disabled:bg-gray-600 disabled:cursor-not-allowed rounded-lg font-medium transition"
+                    title={!trade.is_valid ? 'This trade is no longer valid' : ''}
                   >
                     {processing ? (
                       <Loader2 className="animate-spin" size={18} />
@@ -289,16 +404,79 @@ export default function TradeDetail({
                 <button
                   onClick={handleCounterOffer}
                   disabled={processing}
-                  className="w-full flex items-center justify-center gap-2 px-4 py-3 bg-blue-600 hover:bg-blue-700 disabled:bg-gray-600 rounded-lg font-medium transition"
+                  className="w-full flex items-center justify-center gap-2 px-4 py-3 bg-purple-600 hover:bg-purple-700 disabled:bg-gray-600 rounded-lg font-medium transition"
                 >
                   <RefreshCcw size={18} />
                   Make Counter Offer
                 </button>
               </>
+            ) : trade.editor_id === user?.id ? (
+              /* User made the last edit - can still edit while waiting for response */
+              <>
+                <p className="text-center text-gray-400 text-sm py-2">
+                  Waiting for {otherUser?.username} to respond...
+                </p>
+                <button
+                  onClick={handleEdit}
+                  disabled={processing}
+                  className="w-full flex items-center justify-center gap-2 px-4 py-3 bg-blue-600 hover:bg-blue-700 disabled:bg-gray-600 rounded-lg font-medium transition"
+                >
+                  <Edit size={18} />
+                  Modify Your Offer
+                </button>
+              </>
             ) : (
-              <p className="text-center text-gray-400 text-sm py-2">
-                Waiting for {otherUser?.username} to respond...
-              </p>
+              /* No editor yet (initial trade) */
+              <>
+                {isUser1 ? (
+                  /* User1 (initiator) can edit their initial offer */
+                  <button
+                    onClick={handleEdit}
+                    disabled={processing}
+                    className="w-full flex items-center justify-center gap-2 px-4 py-3 bg-blue-600 hover:bg-blue-700 disabled:bg-gray-600 rounded-lg font-medium transition"
+                  >
+                    <Edit size={18} />
+                    Edit Trade Offer
+                  </button>
+                ) : (
+                  /* User2 (partner) can accept/decline/counter */
+                  <>
+                    <div className="flex gap-2">
+                      <button
+                        onClick={handleAccept}
+                        disabled={processing || !trade.is_valid}
+                        className="flex-1 flex items-center justify-center gap-2 px-4 py-3 bg-green-600 hover:bg-green-700 disabled:bg-gray-600 disabled:cursor-not-allowed rounded-lg font-medium transition"
+                        title={!trade.is_valid ? 'This trade is no longer valid' : ''}
+                      >
+                        {processing ? (
+                          <Loader2 className="animate-spin" size={18} />
+                        ) : (
+                          <>
+                            <Check size={18} />
+                            Accept Trade
+                          </>
+                        )}
+                      </button>
+                      <button
+                        onClick={handleDecline}
+                        disabled={processing}
+                        className="flex-1 flex items-center justify-center gap-2 px-4 py-3 bg-red-600 hover:bg-red-700 disabled:bg-gray-600 rounded-lg font-medium transition"
+                      >
+                        <X size={18} />
+                        Decline
+                      </button>
+                    </div>
+                    <button
+                      onClick={handleCounterOffer}
+                      disabled={processing}
+                      className="w-full flex items-center justify-center gap-2 px-4 py-3 bg-purple-600 hover:bg-purple-700 disabled:bg-gray-600 rounded-lg font-medium transition"
+                    >
+                      <RefreshCcw size={18} />
+                      Make Counter Offer
+                    </button>
+                  </>
+                )}
+              </>
             )}
           </div>
         )}

src/index.css

@@ -167,6 +167,34 @@
   animation: float 3s ease-in-out infinite;
 }
 
+/* Diagonal Carousel - Cards flow from bottom-left to top-right diagonally and loop */
+@keyframes flowDiagonal {
+  0% {
+    translate: 0 0;
+    opacity: 1;
+  }
+  60% {
+    translate: 600px -600px;
+    opacity: 1;
+  }
+  75% {
+    translate: 900px -900px;
+    opacity: 0.6;
+  }
+  85% {
+    translate: 1100px -1100px;
+    opacity: 0.3;
+  }
+  100% {
+    translate: 1400px -1400px;
+    opacity: 0;
+  }
+}
+
+.animate-flow-right {
+  animation: flowDiagonal 40s linear infinite;
+}
+
 /* Gradient Animation */
 @keyframes gradientShift {
   0% {

src/lib/Entities.ts

@@ -205,42 +205,55 @@ export type Database = {
             trades: {
                 Row: {
                     id: string
-                    sender_id: string
-                    receiver_id: string
+                    user1_id: string
+                    user2_id: string
                     status: 'pending' | 'accepted' | 'declined' | 'cancelled'
                     message: string | null
                     created_at: string | null
                     updated_at: string | null
+                    version: number
+                    editor_id: string | null
                 }
                 Insert: {
                     id?: string
-                    sender_id: string
-                    receiver_id: string
+                    user1_id: string
+                    user2_id: string
                     status?: 'pending' | 'accepted' | 'declined' | 'cancelled'
                     message?: string | null
                     created_at?: string | null
                     updated_at?: string | null
+                    version?: number
+                    editor_id?: string | null
                 }
                 Update: {
                     id?: string
-                    sender_id?: string
-                    receiver_id?: string
+                    user1_id?: string
+                    user2_id?: string
                     status?: 'pending' | 'accepted' | 'declined' | 'cancelled'
                     message?: string | null
                     created_at?: string | null
                     updated_at?: string | null
+                    version?: number
+                    editor_id?: string | null
                 }
                 Relationships: [
                     {
-                        foreignKeyName: "trades_sender_id_fkey"
-                        columns: ["sender_id"]
+                        foreignKeyName: "trades_user1_id_fkey"
+                        columns: ["user1_id"]
                         isOneToOne: false
                         referencedRelation: "profiles"
                         referencedColumns: ["id"]
                     },
                     {
-                        foreignKeyName: "trades_receiver_id_fkey"
-                        columns: ["receiver_id"]
+                        foreignKeyName: "trades_user2_id_fkey"
+                        columns: ["user2_id"]
+                        isOneToOne: false
+                        referencedRelation: "profiles"
+                        referencedColumns: ["id"]
+                    },
+                    {
+                        foreignKeyName: "trades_editor_id_fkey"
+                        columns: ["editor_id"]
                         isOneToOne: false
                         referencedRelation: "profiles"
                         referencedColumns: ["id"]

src/services/api.ts

@@ -75,10 +75,76 @@ export const getUserCollection = async (userId: string): Promise<Map<string, num
   return collectionMap;
 };
 
+// Paginated collection API
+export interface PaginatedCollectionResult {
+  items: Map<string, number>; // card_id -> quantity
+  totalCount: number;
+  hasMore: boolean;
+}
+
+// Get total collection value from user profile (pre-calculated by triggers)
+export const getCollectionTotalValue = async (userId: string): Promise<number> => {
+  const { data, error } = await supabase
+    .from('profiles')
+    .select('collection_total_value')
+    .eq('id', userId)
+    .single();
+
+  if (error) {
+    console.error('Error fetching collection total value:', error);
+    return 0;
+  }
+
+  return data?.collection_total_value || 0;
+};
+
+export const getUserCollectionPaginated = async (
+  userId: string,
+  pageSize: number = 50,
+  offset: number = 0
+): Promise<PaginatedCollectionResult> => {
+  // First, get the total count
+  const { count: totalCount, error: countError } = await supabase
+    .from('collections')
+    .select('*', { count: 'exact', head: true })
+    .eq('user_id', userId);
+
+  if (countError) {
+    console.error('Error counting user collection:', countError);
+    throw countError;
+  }
+
+  // Then get the paginated data
+  const { data, error } = await supabase
+    .from('collections')
+    .select('card_id, quantity')
+    .eq('user_id', userId)
+    .order('created_at', { ascending: false })
+    .range(offset, offset + pageSize - 1);
+
+  if (error) {
+    console.error('Error fetching user collection:', error);
+    throw error;
+  }
+
+  // Create a map of card_id to quantity for easy lookup
+  const collectionMap = new Map<string, number>();
+  data?.forEach((item) => {
+    collectionMap.set(item.card_id, item.quantity);
+  });
+
+  return {
+    items: collectionMap,
+    totalCount: totalCount || 0,
+    hasMore: offset + pageSize < (totalCount || 0),
+  };
+};
+
 export const addCardToCollection = async (
   userId: string,
   cardId: string,
-  quantity: number = 1
+  quantity: number = 1,
+  priceUsd: number = 0
 ): Promise<void> => {
   // Check if card already exists in collection
   const { data: existing, error: fetchError } = await supabase
@@ -94,11 +160,12 @@ export const addCardToCollection = async (
   }
 
   if (existing) {
-    // Update existing card quantity
+    // Update existing card quantity and price
     const { error: updateError } = await supabase
       .from('collections')
       .update({
         quantity: existing.quantity + quantity,
+        price_usd: priceUsd,
         updated_at: new Date().toISOString()
       })
       .eq('id', existing.id);
@@ -112,6 +179,7 @@ export const addCardToCollection = async (
         user_id: userId,
         card_id: cardId,
         quantity: quantity,
+        price_usd: priceUsd,
       });
 
     if (insertError) throw insertError;
@@ -120,7 +188,7 @@ export const addCardToCollection = async (
 
 export const addMultipleCardsToCollection = async (
   userId: string,
-  cards: { cardId: string; quantity: number }[]
+  cards: { cardId: string; quantity: number; priceUsd?: number }[]
 ): Promise<void> => {
   // Fetch existing cards in collection
   const cardIds = cards.map(c => c.cardId);
@@ -146,6 +214,7 @@ export const addMultipleCardsToCollection = async (
       toUpdate.push({
         id: existing.id,
         quantity: existing.quantity + card.quantity,
+        price_usd: card.priceUsd || 0,
         updated_at: new Date().toISOString(),
       });
     } else {
@@ -153,6 +222,7 @@ export const addMultipleCardsToCollection = async (
         user_id: userId,
         card_id: card.cardId,
         quantity: card.quantity,
+        price_usd: card.priceUsd || 0,
       });
     }
   }
@@ -170,7 +240,11 @@ export const addMultipleCardsToCollection = async (
     for (const update of toUpdate) {
       const { error: updateError } = await supabase
         .from('collections')
-        .update({ quantity: update.quantity, updated_at: update.updated_at })
+        .update({
+          quantity: update.quantity,
+          price_usd: update.price_usd,
+          updated_at: update.updated_at
+        })
         .eq('id', update.id);
 
       if (updateError) throw updateError;

src/services/tradesService.ts

@@ -10,23 +10,53 @@ export interface TradeItem {
 
 export interface Trade {
   id: string;
-  sender_id: string;
-  receiver_id: string;
+  user1_id: string;
+  user2_id: string;
   status: 'pending' | 'accepted' | 'declined' | 'cancelled';
   message: string | null;
   created_at: string | null;
   updated_at: string | null;
-  sender?: { username: string | null };
-  receiver?: { username: string | null };
+  version: number;
+  editor_id: string | null;
+  is_valid: boolean;
+  user1?: { username: string | null };
+  user2?: { username: string | null };
   items?: TradeItem[];
 }
 
+export interface TradeHistoryEntry {
+  id: string;
+  trade_id: string;
+  version: number;
+  editor_id: string;
+  message: string | null;
+  created_at: string;
+  editor?: { username: string | null };
+  items?: TradeHistoryItem[];
+}
+
+export interface TradeHistoryItem {
+  id: string;
+  history_id: string;
+  owner_id: string;
+  card_id: string;
+  quantity: number;
+}
+
 export interface CreateTradeParams {
-  senderId: string;
-  receiverId: string;
+  user1Id: string;
+  user2Id: string;
   message?: string;
-  senderCards: { cardId: string; quantity: number }[];
-  receiverCards: { cardId: string; quantity: number }[];
+  user1Cards: { cardId: string; quantity: number }[];
+  user2Cards: { cardId: string; quantity: number }[];
+}
+
+export interface UpdateTradeParams {
+  tradeId: string;
+  editorId: string;
+  message?: string;
+  myCards: { cardId: string; quantity: number }[];
+  theirCards: { cardId: string; quantity: number }[];
 }
 
 // Get all trades for a user
@@ -35,11 +65,11 @@ export async function getTrades(userId: string): Promise<Trade[]> {
     .from('trades')
     .select(`
       *,
-      sender:profiles!trades_sender_id_fkey(username),
-      receiver:profiles!trades_receiver_id_fkey(username),
+      user1:profiles!trades_user1_id_fkey(username),
+      user2:profiles!trades_user2_id_fkey(username),
       items:trade_items(*)
     `)
-    .or(`sender_id.eq.${userId},receiver_id.eq.${userId}`)
+    .or(`user1_id.eq.${userId},user2_id.eq.${userId}`)
     .order('created_at', { ascending: false });
 
   if (error) throw error;
@@ -52,12 +82,12 @@ export async function getPendingTrades(userId: string): Promise<Trade[]> {
     .from('trades')
     .select(`
       *,
-      sender:profiles!trades_sender_id_fkey(username),
-      receiver:profiles!trades_receiver_id_fkey(username),
+      user1:profiles!trades_user1_id_fkey(username),
+      user2:profiles!trades_user2_id_fkey(username),
       items:trade_items(*)
     `)
     .eq('status', 'pending')
-    .or(`sender_id.eq.${userId},receiver_id.eq.${userId}`)
+    .or(`user1_id.eq.${userId},user2_id.eq.${userId}`)
     .order('created_at', { ascending: false });
 
   if (error) throw error;
@@ -70,8 +100,8 @@ export async function getTradeById(tradeId: string): Promise<Trade | null> {
     .from('trades')
     .select(`
       *,
-      sender:profiles!trades_sender_id_fkey(username),
-      receiver:profiles!trades_receiver_id_fkey(username),
+      user1:profiles!trades_user1_id_fkey(username),
+      user2:profiles!trades_user2_id_fkey(username),
       items:trade_items(*)
     `)
     .eq('id', tradeId)
@@ -83,39 +113,40 @@ export async function getTradeById(tradeId: string): Promise<Trade | null> {
 
 // Create a new trade with items
 export async function createTrade(params: CreateTradeParams): Promise<Trade> {
-  const { senderId, receiverId, message, senderCards, receiverCards } = params;
+  const { user1Id, user2Id, message, user1Cards, user2Cards } = params;
 
   // Create the trade
   const { data: trade, error: tradeError } = await supabase
     .from('trades')
     .insert({
-      sender_id: senderId,
-      receiver_id: receiverId,
+      user1_id: user1Id,
+      user2_id: user2Id,
       message,
       status: 'pending',
+      // editor_id starts as null - gets set when someone edits the trade
     })
     .select()
     .single();
 
   if (tradeError) throw tradeError;
 
-  // Add sender's cards
-  const senderItems = senderCards.map((card) => ({
+  // Add user1's cards
+  const user1Items = user1Cards.map((card) => ({
     trade_id: trade.id,
-    owner_id: senderId,
+    owner_id: user1Id,
     card_id: card.cardId,
     quantity: card.quantity,
   }));
 
-  // Add receiver's cards (what sender wants)
-  const receiverItems = receiverCards.map((card) => ({
+  // Add user2's cards
+  const user2Items = user2Cards.map((card) => ({
     trade_id: trade.id,
-    owner_id: receiverId,
+    owner_id: user2Id,
     card_id: card.cardId,
     quantity: card.quantity,
   }));
 
-  const allItems = [...senderItems, ...receiverItems];
+  const allItems = [...user1Items, ...user2Items];
 
   if (allItems.length > 0) {
     const { error: itemsError } = await supabase
@@ -130,6 +161,25 @@ export async function createTrade(params: CreateTradeParams): Promise<Trade> {
 
 // Accept a trade (executes the card transfer)
 export async function acceptTrade(tradeId: string): Promise<boolean> {
+  // First check if the trade is valid
+  const { data: trade, error: tradeError } = await supabase
+    .from('trades')
+    .select('is_valid, status')
+    .eq('id', tradeId)
+    .single();
+
+  if (tradeError) throw tradeError;
+
+  // Prevent accepting invalid trades
+  if (!trade.is_valid) {
+    throw new Error('This trade is no longer valid. One or more cards are no longer available in the required quantities.');
+  }
+
+  // Prevent accepting non-pending trades
+  if (trade.status !== 'pending') {
+    throw new Error('This trade has already been processed.');
+  }
+
   const { data, error } = await supabase.rpc('execute_trade', {
     trade_id: tradeId,
   });
@@ -170,11 +220,11 @@ export async function getTradeHistory(userId: string): Promise<Trade[]> {
     .from('trades')
     .select(`
       *,
-      sender:profiles!trades_sender_id_fkey(username),
-      receiver:profiles!trades_receiver_id_fkey(username),
+      user1:profiles!trades_user1_id_fkey(username),
+      user2:profiles!trades_user2_id_fkey(username),
       items:trade_items(*)
     `)
-    .or(`sender_id.eq.${userId},receiver_id.eq.${userId}`)
+    .or(`user1_id.eq.${userId},user2_id.eq.${userId}`)
     .in('status', ['accepted', 'declined', 'cancelled'])
     .order('updated_at', { ascending: false })
     .limit(50);
@@ -182,3 +232,116 @@ export async function getTradeHistory(userId: string): Promise<Trade[]> {
   if (error) throw error;
   return data as Trade[];
 }
+
+// Update an existing trade (for edits and counter-offers)
+export async function updateTrade(params: UpdateTradeParams): Promise<Trade> {
+  const { tradeId, editorId, message, myCards, theirCards } = params;
+
+  // Get current trade info
+  const { data: currentTrade, error: tradeError } = await supabase
+    .from('trades')
+    .select('version, user1_id, user2_id')
+    .eq('id', tradeId)
+    .single();
+
+  if (tradeError) throw tradeError;
+
+  const newVersion = (currentTrade.version || 1) + 1;
+
+  // Determine the other user's ID
+  const otherUserId = currentTrade.user1_id === editorId
+    ? currentTrade.user2_id
+    : currentTrade.user1_id;
+
+  // Save current state to history before updating
+  const { data: historyEntry, error: historyError } = await supabase
+    .from('trade_history')
+    .insert({
+      trade_id: tradeId,
+      version: currentTrade.version || 1,
+      editor_id: editorId,
+      message: message || null,
+    })
+    .select()
+    .single();
+
+  if (historyError) throw historyError;
+
+  // Save current items to history
+  const { data: currentItems } = await supabase
+    .from('trade_items')
+    .select('*')
+    .eq('trade_id', tradeId);
+
+  if (currentItems && currentItems.length > 0) {
+    const historyItems = currentItems.map(item => ({
+      history_id: historyEntry.id,
+      owner_id: item.owner_id,
+      card_id: item.card_id,
+      quantity: item.quantity,
+    }));
+
+    await supabase.from('trade_history_items').insert(historyItems);
+  }
+
+  // Update the trade
+  const { data: updatedTrade, error: updateError } = await supabase
+    .from('trades')
+    .update({
+      message,
+      version: newVersion,
+      editor_id: editorId,
+      updated_at: new Date().toISOString(),
+    })
+    .eq('id', tradeId)
+    .select()
+    .single();
+
+  if (updateError) throw updateError;
+
+  // Delete existing items
+  await supabase.from('trade_items').delete().eq('trade_id', tradeId);
+
+  // Add new items (myCards belong to editor, theirCards belong to other user)
+  const myItems = myCards.map((card) => ({
+    trade_id: tradeId,
+    owner_id: editorId,
+    card_id: card.cardId,
+    quantity: card.quantity,
+  }));
+
+  const theirItems = theirCards.map((card) => ({
+    trade_id: tradeId,
+    owner_id: otherUserId,
+    card_id: card.cardId,
+    quantity: card.quantity,
+  }));
+
+  const allItems = [...myItems, ...theirItems];
+
+  if (allItems.length > 0) {
+    const { error: itemsError } = await supabase
+      .from('trade_items')
+      .insert(allItems);
+
+    if (itemsError) throw itemsError;
+  }
+
+  return updatedTrade;
+}
+
+// Get version history for a trade
+export async function getTradeVersionHistory(tradeId: string): Promise<TradeHistoryEntry[]> {
+  const { data, error } = await supabase
+    .from('trade_history')
+    .select(`
+      *,
+      editor:profiles!trade_history_editor_id_fkey(username),
+      items:trade_history_items(*)
+    `)
+    .eq('trade_id', tradeId)
+    .order('version', { ascending: true });
+
+  if (error) throw error;
+  return data as TradeHistoryEntry[];
+}

supabase/migrations/20250124000000_friends_trades_visibility.sql

@@ -0,0 +1,273 @@
+/*
+  # Friends, Trades, and Collection Visibility
+
+  1. Changes to profiles
+    - Add `collection_visibility` column (public, friends, private)
+
+  2. New Tables
+    - `friendships` - Friend relationships between users
+    - `trades` - Trade offers between users
+    - `trade_items` - Cards included in trades
+
+  3. Security
+    - RLS policies for all new tables
+    - Updated collection policies for visibility
+*/
+
+-- Add collection visibility to profiles
+ALTER TABLE public.profiles
+ADD COLUMN collection_visibility text DEFAULT 'private'
+CHECK (collection_visibility IN ('public', 'friends', 'private'));
+
+-- =============================================
+-- FRIENDSHIPS TABLE
+-- =============================================
+CREATE TABLE public.friendships (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  requester_id uuid REFERENCES public.profiles(id) ON DELETE CASCADE NOT NULL,
+  addressee_id uuid REFERENCES public.profiles(id) ON DELETE CASCADE NOT NULL,
+  status text DEFAULT 'pending' CHECK (status IN ('pending', 'accepted', 'declined')),
+  created_at timestamptz DEFAULT now(),
+  updated_at timestamptz DEFAULT now(),
+  UNIQUE(requester_id, addressee_id),
+  CHECK (requester_id != addressee_id)
+);
+
+ALTER TABLE public.friendships ENABLE ROW LEVEL SECURITY;
+
+-- Users can see friendships they're involved in
+CREATE POLICY "Users can view their friendships"
+  ON public.friendships
+  FOR SELECT
+  TO authenticated
+  USING (requester_id = auth.uid() OR addressee_id = auth.uid());
+
+-- Users can create friend requests
+CREATE POLICY "Users can send friend requests"
+  ON public.friendships
+  FOR INSERT
+  TO authenticated
+  WITH CHECK (requester_id = auth.uid());
+
+-- Users can update friendships they received (accept/decline)
+CREATE POLICY "Users can respond to friend requests"
+  ON public.friendships
+  FOR UPDATE
+  TO authenticated
+  USING (addressee_id = auth.uid());
+
+-- Users can delete their own friendships
+CREATE POLICY "Users can delete their friendships"
+  ON public.friendships
+  FOR DELETE
+  TO authenticated
+  USING (requester_id = auth.uid() OR addressee_id = auth.uid());
+
+-- =============================================
+-- TRADES TABLE
+-- =============================================
+CREATE TABLE public.trades (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  sender_id uuid REFERENCES public.profiles(id) ON DELETE CASCADE NOT NULL,
+  receiver_id uuid REFERENCES public.profiles(id) ON DELETE CASCADE NOT NULL,
+  status text DEFAULT 'pending' CHECK (status IN ('pending', 'accepted', 'declined', 'cancelled')),
+  message text,
+  created_at timestamptz DEFAULT now(),
+  updated_at timestamptz DEFAULT now(),
+  CHECK (sender_id != receiver_id)
+);
+
+ALTER TABLE public.trades ENABLE ROW LEVEL SECURITY;
+
+-- Users can see trades they're involved in
+CREATE POLICY "Users can view their trades"
+  ON public.trades
+  FOR SELECT
+  TO authenticated
+  USING (sender_id = auth.uid() OR receiver_id = auth.uid());
+
+-- Users can create trades
+CREATE POLICY "Users can create trades"
+  ON public.trades
+  FOR INSERT
+  TO authenticated
+  WITH CHECK (sender_id = auth.uid());
+
+-- Sender can cancel, receiver can accept/decline
+CREATE POLICY "Users can update their trades"
+  ON public.trades
+  FOR UPDATE
+  TO authenticated
+  USING (sender_id = auth.uid() OR receiver_id = auth.uid());
+
+-- =============================================
+-- TRADE ITEMS TABLE
+-- =============================================
+CREATE TABLE public.trade_items (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  trade_id uuid REFERENCES public.trades(id) ON DELETE CASCADE NOT NULL,
+  owner_id uuid REFERENCES public.profiles(id) ON DELETE CASCADE NOT NULL,
+  card_id text NOT NULL,
+  quantity integer DEFAULT 1 CHECK (quantity > 0),
+  created_at timestamptz DEFAULT now()
+);
+
+ALTER TABLE public.trade_items ENABLE ROW LEVEL SECURITY;
+
+-- Users can see items in their trades
+CREATE POLICY "Users can view trade items"
+  ON public.trade_items
+  FOR SELECT
+  TO authenticated
+  USING (
+    EXISTS (
+      SELECT 1 FROM public.trades
+      WHERE trades.id = trade_items.trade_id
+      AND (trades.sender_id = auth.uid() OR trades.receiver_id = auth.uid())
+    )
+  );
+
+-- Users can add items to trades they created
+CREATE POLICY "Users can add trade items"
+  ON public.trade_items
+  FOR INSERT
+  TO authenticated
+  WITH CHECK (
+    EXISTS (
+      SELECT 1 FROM public.trades
+      WHERE trades.id = trade_items.trade_id
+      AND trades.sender_id = auth.uid()
+      AND trades.status = 'pending'
+    )
+  );
+
+-- =============================================
+-- UPDATE COLLECTION POLICIES FOR VISIBILITY
+-- =============================================
+
+-- Drop old restrictive policy
+DROP POLICY IF EXISTS "Users can view their own collection" ON public.collections;
+
+-- New policy: view own collection OR public collections OR friend's collections (if friends visibility)
+CREATE POLICY "Users can view collections based on visibility"
+  ON public.collections
+  FOR SELECT
+  TO authenticated
+  USING (
+    user_id = auth.uid()
+    OR EXISTS (
+      SELECT 1 FROM public.profiles
+      WHERE profiles.id = collections.user_id
+      AND profiles.collection_visibility = 'public'
+    )
+    OR EXISTS (
+      SELECT 1 FROM public.profiles p
+      JOIN public.friendships f ON (
+        (f.requester_id = p.id AND f.addressee_id = auth.uid())
+        OR (f.addressee_id = p.id AND f.requester_id = auth.uid())
+      )
+      WHERE p.id = collections.user_id
+      AND p.collection_visibility = 'friends'
+      AND f.status = 'accepted'
+    )
+  );
+
+-- =============================================
+-- UPDATE PROFILES POLICY FOR PUBLIC VIEWING
+-- =============================================
+
+-- Drop old restrictive policy
+DROP POLICY IF EXISTS "Users can view their own profile" ON public.profiles;
+
+-- New policy: users can view all profiles (needed for friend search and public collections)
+CREATE POLICY "Users can view profiles"
+  ON public.profiles
+  FOR SELECT
+  TO authenticated
+  USING (true);
+
+-- =============================================
+-- FUNCTION: Execute trade (transfer cards)
+-- =============================================
+CREATE OR REPLACE FUNCTION public.execute_trade(trade_id uuid)
+RETURNS boolean
+LANGUAGE plpgsql
+SECURITY DEFINER
+AS $$
+DECLARE
+  v_trade RECORD;
+  v_item RECORD;
+BEGIN
+  -- Get the trade
+  SELECT * INTO v_trade FROM public.trades WHERE id = trade_id;
+
+  -- Check trade exists and is pending
+  IF v_trade IS NULL OR v_trade.status != 'pending' THEN
+    RETURN false;
+  END IF;
+
+  -- Check caller is the receiver
+  IF v_trade.receiver_id != auth.uid() THEN
+    RETURN false;
+  END IF;
+
+  -- Process each trade item
+  FOR v_item IN SELECT * FROM public.trade_items WHERE trade_items.trade_id = execute_trade.trade_id
+  LOOP
+    -- Determine new owner
+    DECLARE
+      v_new_owner uuid;
+    BEGIN
+      IF v_item.owner_id = v_trade.sender_id THEN
+        v_new_owner := v_trade.receiver_id;
+      ELSE
+        v_new_owner := v_trade.sender_id;
+      END IF;
+
+      -- Remove from old owner's collection
+      UPDATE public.collections
+      SET quantity = quantity - v_item.quantity,
+          updated_at = now()
+      WHERE user_id = v_item.owner_id
+      AND card_id = v_item.card_id;
+
+      -- Delete if quantity is 0 or less
+      DELETE FROM public.collections
+      WHERE user_id = v_item.owner_id
+      AND card_id = v_item.card_id
+      AND quantity <= 0;
+
+      -- Add to new owner's collection
+      INSERT INTO public.collections (user_id, card_id, quantity)
+      VALUES (v_new_owner, v_item.card_id, v_item.quantity)
+      ON CONFLICT (user_id, card_id)
+      DO UPDATE SET
+        quantity = collections.quantity + v_item.quantity,
+        updated_at = now();
+    END;
+  END LOOP;
+
+  -- Mark trade as accepted
+  UPDATE public.trades
+  SET status = 'accepted', updated_at = now()
+  WHERE id = trade_id;
+
+  RETURN true;
+END;
+$$;
+
+-- Add unique constraint on collections for upsert
+ALTER TABLE public.collections
+ADD CONSTRAINT collections_user_card_unique UNIQUE (user_id, card_id);
+
+-- =============================================
+-- INDEXES FOR PERFORMANCE
+-- =============================================
+CREATE INDEX idx_friendships_requester ON public.friendships(requester_id);
+CREATE INDEX idx_friendships_addressee ON public.friendships(addressee_id);
+CREATE INDEX idx_friendships_status ON public.friendships(status);
+CREATE INDEX idx_trades_sender ON public.trades(sender_id);
+CREATE INDEX idx_trades_receiver ON public.trades(receiver_id);
+CREATE INDEX idx_trades_status ON public.trades(status);
+CREATE INDEX idx_trade_items_trade ON public.trade_items(trade_id);
+CREATE INDEX idx_profiles_visibility ON public.profiles(collection_visibility);

supabase/migrations/20250126000000_trade_history.sql

@@ -0,0 +1,78 @@
+-- Create trade_history table to track all versions of a trade
+CREATE TABLE IF NOT EXISTS public.trade_history (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  trade_id uuid REFERENCES public.trades(id) ON DELETE CASCADE NOT NULL,
+  version integer NOT NULL,
+  editor_id uuid REFERENCES public.profiles(id) NOT NULL,
+  message text,
+  created_at timestamptz DEFAULT now(),
+  UNIQUE(trade_id, version)
+);
+
+-- Create trade_history_items table to store cards for each version
+CREATE TABLE IF NOT EXISTS public.trade_history_items (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  history_id uuid REFERENCES public.trade_history(id) ON DELETE CASCADE NOT NULL,
+  owner_id uuid REFERENCES public.profiles(id) NOT NULL,
+  card_id text NOT NULL,
+  quantity integer DEFAULT 1,
+  created_at timestamptz DEFAULT now()
+);
+
+-- Add version column to trades table to track current version
+ALTER TABLE public.trades ADD COLUMN IF NOT EXISTS version integer DEFAULT 1;
+
+-- Add editor_id to track who last edited the trade
+ALTER TABLE public.trades ADD COLUMN IF NOT EXISTS editor_id uuid REFERENCES public.profiles(id);
+
+-- Create indexes for better performance
+CREATE INDEX IF NOT EXISTS idx_trade_history_trade_id ON public.trade_history(trade_id);
+CREATE INDEX IF NOT EXISTS idx_trade_history_items_history_id ON public.trade_history_items(history_id);
+
+-- Enable RLS
+ALTER TABLE public.trade_history ENABLE ROW LEVEL SECURITY;
+ALTER TABLE public.trade_history_items ENABLE ROW LEVEL SECURITY;
+
+-- RLS policies for trade_history
+CREATE POLICY "Users can view history of their trades"
+  ON public.trade_history FOR SELECT
+  USING (
+    EXISTS (
+      SELECT 1 FROM public.trades
+      WHERE trades.id = trade_history.trade_id
+      AND (trades.sender_id = auth.uid() OR trades.receiver_id = auth.uid())
+    )
+  );
+
+CREATE POLICY "Users can create history for their trades"
+  ON public.trade_history FOR INSERT
+  WITH CHECK (
+    EXISTS (
+      SELECT 1 FROM public.trades
+      WHERE trades.id = trade_history.trade_id
+      AND (trades.sender_id = auth.uid() OR trades.receiver_id = auth.uid())
+    )
+  );
+
+-- RLS policies for trade_history_items
+CREATE POLICY "Users can view history items of their trades"
+  ON public.trade_history_items FOR SELECT
+  USING (
+    EXISTS (
+      SELECT 1 FROM public.trade_history th
+      JOIN public.trades t ON t.id = th.trade_id
+      WHERE th.id = trade_history_items.history_id
+      AND (t.sender_id = auth.uid() OR t.receiver_id = auth.uid())
+    )
+  );
+
+CREATE POLICY "Users can create history items for their trades"
+  ON public.trade_history_items FOR INSERT
+  WITH CHECK (
+    EXISTS (
+      SELECT 1 FROM public.trade_history th
+      JOIN public.trades t ON t.id = th.trade_id
+      WHERE th.id = trade_history_items.history_id
+      AND (t.sender_id = auth.uid() OR t.receiver_id = auth.uid())
+    )
+  );

supabase/migrations/20250127000000_add_price_to_collections.sql

@@ -0,0 +1,9 @@
+-- Add price_usd column to collections table
+ALTER TABLE collections
+ADD COLUMN IF NOT EXISTS price_usd DECIMAL(10, 2) DEFAULT 0;
+
+-- Create index for faster price calculations
+CREATE INDEX IF NOT EXISTS idx_collections_price ON collections(price_usd);
+
+-- Add comment
+COMMENT ON COLUMN collections.price_usd IS 'USD price of the card at time of addition/update';

supabase/migrations/20250127000001_add_trade_validation.sql

@@ -0,0 +1,101 @@
+-- Add is_valid column to trades table
+ALTER TABLE public.trades
+ADD COLUMN IF NOT EXISTS is_valid BOOLEAN DEFAULT true;
+
+-- Create index for filtering by validity
+CREATE INDEX IF NOT EXISTS idx_trades_is_valid ON public.trades(is_valid);
+
+-- Function to validate if a trade can still be executed based on current collections
+CREATE OR REPLACE FUNCTION public.validate_trade(p_trade_id uuid)
+RETURNS boolean
+LANGUAGE plpgsql
+SECURITY DEFINER
+AS $$
+DECLARE
+  v_item RECORD;
+  v_collection_quantity integer;
+BEGIN
+  -- Check each item in the trade
+  FOR v_item IN
+    SELECT owner_id, card_id, quantity
+    FROM public.trade_items
+    WHERE trade_id = p_trade_id
+  LOOP
+    -- Get the quantity of this card in the owner's collection
+    SELECT COALESCE(quantity, 0) INTO v_collection_quantity
+    FROM public.collections
+    WHERE user_id = v_item.owner_id
+    AND card_id = v_item.card_id;
+
+    -- If owner doesn't have enough of this card, trade is invalid
+    IF v_collection_quantity < v_item.quantity THEN
+      RETURN false;
+    END IF;
+  END LOOP;
+
+  -- All items are available, trade is valid
+  RETURN true;
+END;
+$$;
+
+-- Function to check and update validity of affected trades when collections change
+CREATE OR REPLACE FUNCTION public.update_affected_trades_validity()
+RETURNS TRIGGER
+LANGUAGE plpgsql
+SECURITY DEFINER
+AS $$
+DECLARE
+  v_user_id uuid;
+  v_card_id text;
+  v_trade RECORD;
+  v_is_valid boolean;
+BEGIN
+  -- Get the user_id and card_id from the changed row
+  IF (TG_OP = 'DELETE') THEN
+    v_user_id := OLD.user_id;
+    v_card_id := OLD.card_id;
+  ELSE
+    v_user_id := NEW.user_id;
+    v_card_id := NEW.card_id;
+  END IF;
+
+  -- Find all pending trades that involve this card from this user
+  FOR v_trade IN
+    SELECT DISTINCT t.id
+    FROM public.trades t
+    JOIN public.trade_items ti ON ti.trade_id = t.id
+    WHERE t.status = 'pending'
+    AND ti.owner_id = v_user_id
+    AND ti.card_id = v_card_id
+  LOOP
+    -- Validate the trade
+    v_is_valid := public.validate_trade(v_trade.id);
+
+    -- Update the trade's validity
+    UPDATE public.trades
+    SET is_valid = v_is_valid,
+        updated_at = now()
+    WHERE id = v_trade.id;
+  END LOOP;
+
+  IF (TG_OP = 'DELETE') THEN
+    RETURN OLD;
+  ELSE
+    RETURN NEW;
+  END IF;
+END;
+$$;
+
+-- Create trigger to auto-update trade validity when collections change
+CREATE TRIGGER update_trades_on_collection_change
+AFTER UPDATE OR DELETE ON public.collections
+FOR EACH ROW
+EXECUTE FUNCTION public.update_affected_trades_validity();
+
+-- Add comment
+COMMENT ON COLUMN public.trades.is_valid IS 'Indicates if the trade can still be executed based on current collections. Auto-updated when collections change.';
+
+-- Initial validation: set is_valid for all existing pending trades
+UPDATE public.trades
+SET is_valid = public.validate_trade(id)
+WHERE status = 'pending';