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# Artists Page Credit Integration

## Overview
The artists page now has a fully integrated credit system for purchasing tracks. Users can buy tracks using their existing credits or purchase credits via Stripe if they don't have enough.

## 🎯 **What's Been Integrated:**

### **1. Enhanced Purchase API (`api/purchase_track.php`)**
- ✅ **Credit-based purchases** - Users with sufficient credits can buy tracks directly
- ✅ **Stripe integration** - Users without enough credits can purchase via Stripe
- ✅ **Payment method detection** - Automatically determines if credits or payment needed
- ✅ **Metadata tracking** - All purchases include track and user information

### **2. Updated Webhook Handler (`webhooks/stripe.php`)**
- ✅ **Track purchase processing** - Handles successful track purchases via Stripe
- ✅ **Credit deduction** - Automatically deducts credits for track purchases
- ✅ **Purchase logging** - Comprehensive logging of all track purchases
- ✅ **Error handling** - Robust error handling and logging

### **3. Enhanced Frontend (`artists.php`)**
- ✅ **Stripe.js integration** - Dynamic loading of Stripe payment forms
- ✅ **Credit balance display** - Shows user's current credit balance
- ✅ **Payment flow** - Seamless transition from credits to Stripe payment
- ✅ **Success handling** - Different success messages for credits vs Stripe
- ✅ **Error handling** - Comprehensive error messages and recovery

## 🔄 **Purchase Flow:**

### **Scenario 1: User Has Enough Credits**
1. User clicks "Buy Full Track" button
2. System checks user's credit balance
3. If sufficient credits → Direct purchase with credit deduction
4. Track immediately available in user's purchases
5. Success message shows remaining credits

### **Scenario 2: User Needs More Credits**
1. User clicks "Buy Full Track" button
2. System checks user's credit balance
3. If insufficient credits → Stripe payment form appears
4. User enters payment details
5. Payment processed via Stripe
6. Webhook processes successful payment
7. Track added to user's purchases
8. Success message confirms purchase

## 💳 **Stripe Integration Details:**

### **Payment Intent Creation:**
```php
$payment_intent = \Stripe\PaymentIntent::create([
    'amount' => round($stripe_price * 100), // Convert to cents
    'currency' => 'usd',
    'metadata' => [
        'user_id' => $user_id,
        'track_id' => $track_id,
        'track_title' => $track['title'],
        'artist_name' => $track['artist_name'],
        'credits' => $credits_needed,
        'purchase_type' => 'track_purchase'
    ],
    'automatic_payment_methods' => [
        'enabled' => true,
    ],
]);
```

### **Webhook Processing:**
```php
function processTrackPurchase($user_id, $track_id, $credits_used, $payment_intent_id) {
    // 1. Verify track exists and is available
    // 2. Check for duplicate purchases
    // 3. Record purchase in database
    // 4. Log credit transaction
    // 5. Log successful purchase
}
```

## 🎨 **UI Enhancements:**

### **Credit Balance Display:**
- Shows current credit balance on each artist card
- Direct link to buy more credits
- Visual credit indicator with coin icon

### **Payment Form Styling:**
- Dark theme compatible Stripe elements
- Consistent with site design
- Clear pricing and credit information
- Loading states and error handling

### **Success Messages:**
- Different messages for credit vs Stripe purchases
- Clear confirmation of track ownership
- Remaining credit balance display
- Link to view all purchases

## 📊 **Database Changes:**

### **Track Purchases Table:**
```sql
ALTER TABLE track_purchases ADD COLUMN payment_method VARCHAR(20) DEFAULT 'credits';
ALTER TABLE track_purchases ADD COLUMN stripe_payment_intent_id VARCHAR(255);
```

### **Credit Transactions Table:**
```sql
ALTER TABLE credit_transactions ADD COLUMN stripe_payment_intent_id VARCHAR(255);
```

## 🔍 **Logging and Monitoring:**

### **Log Files Created:**
- `/logs/track_purchases.log` - Successful track purchases
- `/logs/track_purchase_errors.log` - Failed purchase attempts
- `/logs/stripe_actions.log` - All Stripe webhook events

### **Log Entry Example:**
```json
{
    "timestamp": "2025-01-24 15:30:45",
    "action": "track_purchase_completed",
    "user_id": 123,
    "track_id": 456,
    "track_title": "Amazing Track",
    "artist_name": "John Doe",
    "credits_used": 2,
    "payment_intent_id": "pi_123456789"
}
```

## 🛡️ **Security Features:**

### **Purchase Validation:**
- ✅ User authentication required
- ✅ Track availability verification
- ✅ Duplicate purchase prevention
- ✅ Self-purchase prevention
- ✅ Credit balance validation

### **Payment Security:**
- ✅ Stripe webhook signature verification
- ✅ Payment intent validation
- ✅ Transaction rollback on errors
- ✅ Comprehensive error logging

## 🧪 **Testing Scenarios:**

### **Test 1: Credit Purchase**
1. User with 5 credits tries to buy 2-credit track
2. Should succeed immediately
3. Credits reduced to 3
4. Track available in purchases

### **Test 2: Stripe Purchase**
1. User with 0 credits tries to buy 2-credit track
2. Should show Stripe payment form
3. Payment should process via Stripe
4. Webhook should complete purchase
5. Track should be available

### **Test 3: Error Handling**
1. User tries to buy their own track
2. Should show error message
3. No credits should be deducted

## 🚀 **Benefits:**

### **For Users:**
- ✅ **Flexible payment options** - Credits or direct payment
- ✅ **Immediate access** - Credit purchases are instant
- ✅ **Clear pricing** - Always know how many credits needed
- ✅ **Purchase history** - Track all purchases

### **For Artists:**
- ✅ **Revenue generation** - Earn from track sales
- ✅ **Credit system** - Encourages platform engagement
- ✅ **Purchase tracking** - See who bought their tracks

### **For Platform:**
- ✅ **Revenue stream** - Credit sales and track commissions
- ✅ **User engagement** - Credit system encourages usage
- ✅ **Data insights** - Track popular artists and tracks

## 🔧 **Configuration:**

### **Stripe Keys:**
- **Live Secret Key:** `sk_live_51OqKxTfpIijPJ9Aq1mn300sSjD7T4`
- **Live Publishable Key:** `pk_live_51OqKxTfpIijPJ9Aq1mn300sSjD7T4`
- **Webhook Secret:** `whsec_t00jaqKxTfpIijPJ9Aq1mn300sSjD7T4`

### **Credit Pricing:**
- **Track Price:** $1.00 per credit (configurable per track)
- **Credit Packages:** Available on `/credits.php`
- **Expiration:** 30 days from purchase

## 📈 **Future Enhancements:**

### **Planned Features:**
- 🔄 **Bulk purchases** - Buy multiple tracks at once
- 🔄 **Artist revenue sharing** - Artists earn from track sales
- 🔄 **Subscription discounts** - Pro users get credit discounts
- 🔄 **Gift purchases** - Buy tracks for other users
- 🔄 **Track previews** - 30-second previews before purchase

### **Analytics:**
- 📊 **Sales tracking** - Track revenue and popular tracks
- 📊 **User behavior** - Analyze purchase patterns
- 📊 **Artist performance** - Track artist earnings

## ✅ **Integration Complete!**

The artists page now has a fully functional credit system that:
- ✅ Integrates seamlessly with existing Stripe setup
- ✅ Provides flexible payment options
- ✅ Maintains security and data integrity
- ✅ Offers excellent user experience
- ✅ Includes comprehensive logging and monitoring

Users can now purchase tracks directly from the artists page using either their existing credits or by purchasing credits via Stripe! 🎵✨