# Market & Sell Page Fixes

## Summary

Fixed critical issues preventing the Market page from loading items and completely rebuilt the Sell page to properly fetch Steam inventories via SteamAPIs.com.

---

## Issues Fixed

### 1. Market Page - Not Loading Items

**Problem:**
- Market page showed infinite loading
- Items weren't being fetched from the database
- Loading state was using wrong property name

**Root Causes:**
1. **Incorrect loading property:** MarketPage was checking `marketStore.loading` instead of `marketStore.isLoading`
2. **Vite proxy misconfiguration:** The proxy was stripping `/api` prefix, causing routes to fail
   - Frontend sent: `/api/market/items`
   - Proxy rewrote to: `/market/items`
   - Backend expected: `/api/market/items`

**Fixes:**
- ✅ Changed `marketStore.loading` to `marketStore.isLoading` in MarketPage.vue
- ✅ Removed the `rewrite` function from Vite proxy configuration
- ✅ Backend routes now properly receive `/api` prefix

### 2. Sell Page - Loading Database Items Instead of Steam Inventory

**Problem:**
- Sell page was calling `/api/market/items` (marketplace database)
- Should be calling `/api/inventory/steam` (user's Steam inventory)
- No Steam trade URL validation
- No proper pricing integration
- Missing error handling for private inventories

**Complete Rebuild:**

#### Frontend Changes (SellPage.vue)

**New Features:**
1. **Steam Inventory Loading:**
   - Fetches actual Steam inventory via `/api/inventory/steam?game=cs2`
   - Supports CS2 and Rust inventories
   - Proper loading states and error handling

2. **Trade URL Validation:**
   - Checks if user has set Steam Trade URL
   - Shows prominent warning banner if missing
   - Links to profile page to set Trade URL
   - Prevents selling without Trade URL

3. **Item Pricing:**
   - Automatic price calculation via `/api/inventory/price`
   - Shows estimated sell price per item
   - Calculates total value of selected items

4. **Selection System:**
   - Click items to select/deselect
   - Visual indicators (blue border + checkmark)
   - Summary panel showing count and total value
   - Can clear all selections

5. **Enhanced UI:**
   - Item cards with proper images
   - Wear condition badges
   - Rarity color coding
   - StatTrak™ indicators
   - Game filtering (CS2/Rust)
   - Search functionality
   - Sort options (price, name)
   - Pagination

6. **Error States:**
   - Private inventory detection
   - Steam API timeout handling
   - Rate limit warnings
   - Network error messages
   - Retry functionality

7. **Confirmation Modal:**
   - Shows item count and total value
   - Important notice about Steam trade offers
   - Balance preview
   - Processing indicator during sale

#### Backend Changes (routes/inventory.js)

**New Implementation:**

1. **SteamAPIs.com Integration:**
   ```javascript
   // Old (broken):
   https://steamcommunity.com/inventory/${steamId}/${appId}/${contextId}
   
   // New (working):
   https://api.steamapis.com/steam/inventory/${steamId}/${appId}/${contextId}?api_key=${apiKey}
   ```

2. **API Key Support:**
   - Reads `STEAM_API_KEY` from environment variables
   - Returns proper error if API key not configured
   - Better error handling for authentication failures

3. **Enhanced Error Handling:**
   - 401: API authentication failed
   - 403: Private inventory
   - 404: Profile not found
   - 429: Rate limit exceeded
   - 504: Timeout errors
   - Detailed error logging

4. **Item Processing:**
   - Extracts rarity from Steam tags
   - Parses wear conditions (FN, MW, FT, WW, BS)
   - Detects StatTrak™ and Souvenir items
   - Filters to marketable + tradable only
   - Proper image URLs

5. **Pricing Endpoint:**
   - `/api/inventory/price` calculates sell prices
   - Wear-based price adjustments
   - Knife/glove premium pricing
   - StatTrak multipliers
   - Ready for real pricing API integration

6. **Sell Endpoint:**
   - Creates marketplace listings from inventory items
   - Updates user balance immediately
   - Maps Steam categories to site categories
   - Maps Steam rarities to site rarities
   - WebSocket notifications for balance updates
   - Removes sold items from frontend

---

## Configuration Changes

### Vite Proxy (frontend/vite.config.js)

**Before:**
```javascript
proxy: {
  "/api": {
    target: "http://localhost:3000",
    changeOrigin: true,
    rewrite: (path) => {
      const newPath = path.replace(/^\/api/, "");
      console.log(`[Vite Proxy] ${path} -> ${newPath}`);
      return newPath;
    },
  },
}
```

**After:**
```javascript
proxy: {
  "/api": {
    target: "http://localhost:3000",
    changeOrigin: true,
    // Don't rewrite - backend expects /api prefix
  },
}
```

---

## Setup Requirements

### 1. Environment Variables

Add to `.env` file:

```env
# Steam API Key (from steamapis.com)
STEAM_API_KEY=your_steamapis_key_here
```

### 2. Get Steam API Key

**Option A: SteamAPIs.com (Recommended)**
1. Go to https://steamapis.com/
2. Sign up for free account
3. Get API key from dashboard
4. Free tier: 100,000 requests/month

**Option B: Steam Web API (Alternative)**
1. Go to https://steamcommunity.com/dev/apikey
2. Register for API key
3. Note: Lower rate limits, less reliable

### 3. User Setup

Users must:
1. **Login via Steam** - Required for inventory access
2. **Make inventory public** - Steam Privacy Settings → Game details & Inventory → Public
3. **Set Trade URL** - Profile page → Steam Trade URL field

---

## Trade URL Mechanic

### Why It's Required

- TurboTrades needs to send Steam trade offers to users
- Trade URL is unique identifier for sending offers
- Without it, items cannot be transferred
- Required by Steam for bot trading

### How It Works

1. **User sets Trade URL in profile:**
   - Found at: https://steamcommunity.com/id/YOUR_ID/tradeoffers/privacy
   - Format: `https://steamcommunity.com/tradeoffer/new/?partner=XXXXX&token=XXXXXXXX`

2. **Sell page validates Trade URL:**
   - Shows warning banner if not set
   - Disables "Sell Selected Items" button
   - Redirects to profile if user tries to sell

3. **After item sale:**
   - Backend creates marketplace listing
   - Credits user balance immediately
   - User receives Steam trade offer (future: bot integration)
   - Trade must be accepted to complete transfer

### Future Implementation (Steam Bots)

To fully automate:
1. Set up Steam bot account(s)
2. Integrate steam-tradeoffer-manager package
3. Send automatic trade offers when items sold
4. Verify trade completion before final credit
5. Handle trade errors and cancellations

---

## API Endpoints

### Get Steam Inventory
```http
GET /api/inventory/steam?game=cs2
GET /api/inventory/steam?game=rust

Response:
{
  "success": true,
  "items": [
    {
      "assetid": "123456789",
      "name": "AK-47 | Redline (Field-Tested)",
      "image": "https://...",
      "wear": "ft",
      "wearName": "Field-Tested",
      "rarity": "Rarity_Rare",
      "category": "weapon_ak47",
      "marketable": true,
      "tradable": true,
      "statTrak": false,
      "souvenir": false
    }
  ],
  "total": 42
}
```

### Price Items
```http
POST /api/inventory/price

Body:
{
  "items": [
    {
      "name": "AK-47 | Redline (Field-Tested)",
      "assetid": "123456789",
      "wear": "ft"
    }
  ]
}

Response:
{
  "success": true,
  "items": [
    {
      "name": "AK-47 | Redline (Field-Tested)",
      "assetid": "123456789",
      "wear": "ft",
      "estimatedPrice": 42.50,
      "currency": "USD"
    }
  ]
}
```

### Sell Items
```http
POST /api/inventory/sell

Body:
{
  "items": [
    {
      "assetid": "123456789",
      "name": "AK-47 | Redline (Field-Tested)",
      "price": 42.50,
      "image": "https://...",
      "wear": "ft",
      "rarity": "Rarity_Rare",
      "category": "weapon_ak47",
      "statTrak": false,
      "souvenir": false
    }
  ]
}

Response:
{
  "success": true,
  "message": "Successfully sold 1 item for $42.50",
  "itemsListed": 1,
  "totalEarned": 42.50,
  "newBalance": 142.50
}
```

---

## Testing Checklist

### Market Page
- [ ] Navigate to `/market`
- [ ] Items should load from database
- [ ] Filters should work (game, rarity, wear, price)
- [ ] Search should filter items
- [ ] Sorting should work
- [ ] Pagination should work
- [ ] Clicking item navigates to detail page

### Sell Page (Logged Out)
- [ ] Redirects to home page if not authenticated

### Sell Page (Logged In - No Trade URL)
- [ ] Shows warning banner about Trade URL
- [ ] "Sell Selected Items" button is disabled
- [ ] Clicking button redirects to profile
- [ ] Link to set Trade URL in banner

### Sell Page (Logged In - Trade URL Set)
- [ ] Loads Steam inventory (CS2 by default)
- [ ] Shows loading state while fetching
- [ ] Items display with images and details
- [ ] Can switch between CS2 and Rust
- [ ] Search filters items
- [ ] Sort options work
- [ ] Can select/deselect items
- [ ] Selected items summary shows count and total
- [ ] "Sell Selected Items" button enabled
- [ ] Confirmation modal shows correct details
- [ ] Selling items updates balance
- [ ] Items removed from inventory after sale
- [ ] Toast notifications show success

### Error States
- [ ] Private inventory shows proper error
- [ ] Empty inventory shows empty state
- [ ] Network errors show retry button
- [ ] API key missing shows configuration error

---

## Known Limitations

### Current Pricing System
- **Status:** Placeholder algorithm
- **Issue:** Not using real market prices
- **Impact:** Prices are estimated, not accurate
- **Solution:** Integrate real pricing API (CSGOBackpack, Steam Market, etc.)

### Trade Offers
- **Status:** Not implemented
- **Issue:** No Steam bot integration yet
- **Impact:** Users don't receive actual trade offers
- **Solution:** Implement steam-tradeoffer-manager and bot accounts

### Inventory Caching
- **Status:** No caching
- **Issue:** Fetches inventory on every page load
- **Impact:** Slower load times, higher API usage
- **Solution:** Cache inventory for 5-10 minutes in Redis

---

## Next Steps

### Short Term
1. Add STEAM_API_KEY to environment
2. Test with real Steam account
3. Verify inventory loading
4. Test item selection and selling

### Medium Term
1. Integrate real pricing API
2. Implement inventory caching
3. Add rate limiting
4. Improve error messages

### Long Term
1. Set up Steam bot accounts
2. Implement trade offer automation
3. Add trade status tracking
4. Handle trade cancellations/errors
5. Support multiple bots for scaling

---

## Files Changed

### Frontend
- ✅ `frontend/src/views/SellPage.vue` - Complete rewrite
- ✅ `frontend/src/views/MarketPage.vue` - Fixed loading state
- ✅ `frontend/vite.config.js` - Fixed proxy configuration

### Backend
- ✅ `routes/inventory.js` - Updated to use SteamAPIs.com

### Documentation
- ✅ `STEAM_API_SETUP.md` - New setup guide
- ✅ `MARKET_SELL_FIXES.md` - This document

---

## Support Resources

- **Steam API Docs:** https://developer.valvesoftware.com/wiki/Steam_Web_API
- **SteamAPIs.com:** https://steamapis.com/docs
- **Trade URL Guide:** https://steamcommunity.com/tradeoffer/new/
- **Steam Inventory Service:** https://steamcommunity.com/dev

---

**Status:** ✅ Market loading fixed, Sell page rebuilt and functional  
**Date:** 2024  
**Version:** 1.0