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<?php
session_start();
require_once 'config/database.php';

header('Content-Type: application/json');

$pdo = getDBConnection();
$user_id = $_SESSION['user_id'] ?? null;

if (!$user_id) {
    echo json_encode(['success' => false, 'message' => 'User not logged in']);
    exit;
}

$input = json_decode(file_get_contents('php://input'), true);
$action = $input['action'] ?? '';

try {
    switch ($action) {
        case 'create':
            createEvent($pdo, $user_id, $input);
            break;
            
        case 'rsvp':
            rsvpEvent($pdo, $user_id, $input);
            break;
            
        case 'like':
            likeEvent($pdo, $user_id, $input);
            break;
            
        case 'comment':
            commentEvent($pdo, $user_id, $input);
            break;
            
        case 'share':
            shareEvent($pdo, $user_id, $input);
            break;
            
        default:
            echo json_encode(['success' => false, 'message' => 'Invalid action']);
    }
} catch (Exception $e) {
    error_log("Events API Error: " . $e->getMessage());
    echo json_encode(['success' => false, 'message' => 'Server error: ' . $e->getMessage()]);
}

function createEvent($pdo, $user_id, $data) {
    $required_fields = ['title', 'event_type', 'description', 'start_date', 'end_date'];
    
    foreach ($required_fields as $field) {
        if (empty($data[$field])) {
            echo json_encode(['success' => false, 'message' => "Missing required field: $field"]);
            return;
        }
    }
    
    $stmt = $pdo->prepare("
        INSERT INTO events (
            creator_id, title, description, event_type, location, venue_name, 
            address, start_date, end_date, max_attendees, ticket_price, is_free
        ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
    ");
    
    $is_free = empty($data['ticket_price']) || $data['ticket_price'] == 0;
    $max_attendees = !empty($data['max_attendees']) ? $data['max_attendees'] : null;
    $ticket_price = !empty($data['ticket_price']) ? $data['ticket_price'] : 0.00;
    
    $stmt->execute([
        $user_id,
        $data['title'],
        $data['description'],
        $data['event_type'],
        $data['location'] ?? '',
        $data['venue_name'] ?? '',
        $data['address'] ?? '',
        $data['start_date'],
        $data['end_date'],
        $max_attendees,
        $ticket_price,
        $is_free
    ]);
    
    $event_id = $pdo->lastInsertId();
    
    echo json_encode([
        'success' => true, 
        'message' => 'Event created successfully',
        'event_id' => $event_id
    ]);
}

function rsvpEvent($pdo, $user_id, $data) {
    if (empty($data['event_id']) || empty($data['status'])) {
        echo json_encode(['success' => false, 'message' => 'Missing event_id or status']);
        return;
    }
    
    $event_id = $data['event_id'];
    $status = $data['status'];
    
    // Check if event exists
    $stmt = $pdo->prepare("SELECT id FROM events WHERE id = ?");
    $stmt->execute([$event_id]);
    if (!$stmt->fetch()) {
        echo json_encode(['success' => false, 'message' => 'Event not found']);
        return;
    }
    
    // Check if RSVP already exists
    $stmt = $pdo->prepare("SELECT id FROM event_attendees WHERE event_id = ? AND user_id = ?");
    $stmt->execute([$event_id, $user_id]);
    
    if ($stmt->fetch()) {
        // Update existing RSVP
        $stmt = $pdo->prepare("UPDATE event_attendees SET status = ?, rsvp_date = NOW() WHERE event_id = ? AND user_id = ?");
        $stmt->execute([$status, $event_id, $user_id]);
    } else {
        // Create new RSVP
        $stmt = $pdo->prepare("INSERT INTO event_attendees (event_id, user_id, status) VALUES (?, ?, ?)");
        $stmt->execute([$event_id, $user_id, $status]);
    }
    
    // Update event attendee count
    $stmt = $pdo->prepare("
        UPDATE events 
        SET current_attendees = (
            SELECT COUNT(*) 
            FROM event_attendees 
            WHERE event_id = ? AND status = 'attending'
        )
        WHERE id = ?
    ");
    $stmt->execute([$event_id, $event_id]);
    
    echo json_encode(['success' => true, 'message' => 'RSVP updated successfully']);
}

function likeEvent($pdo, $user_id, $data) {
    if (empty($data['event_id'])) {
        echo json_encode(['success' => false, 'message' => 'Missing event_id']);
        return;
    }
    
    $event_id = $data['event_id'];
    
    // Check if already liked
    $stmt = $pdo->prepare("SELECT id FROM event_likes WHERE event_id = ? AND user_id = ?");
    $stmt->execute([$event_id, $user_id]);
    
    if ($stmt->fetch()) {
        // Unlike
        $stmt = $pdo->prepare("DELETE FROM event_likes WHERE event_id = ? AND user_id = ?");
        $stmt->execute([$event_id, $user_id]);
        echo json_encode(['success' => true, 'message' => 'Event unliked']);
    } else {
        // Like
        $stmt = $pdo->prepare("INSERT INTO event_likes (event_id, user_id) VALUES (?, ?)");
        $stmt->execute([$event_id, $user_id]);
        echo json_encode(['success' => true, 'message' => 'Event liked']);
    }
}

function commentEvent($pdo, $user_id, $data) {
    if (empty($data['event_id']) || empty($data['comment'])) {
        echo json_encode(['success' => false, 'message' => 'Missing event_id or comment']);
        return;
    }
    
    $stmt = $pdo->prepare("INSERT INTO event_comments (event_id, user_id, comment) VALUES (?, ?, ?)");
    $stmt->execute([$data['event_id'], $user_id, $data['comment']]);
    
    echo json_encode(['success' => true, 'message' => 'Comment added successfully']);
}

function shareEvent($pdo, $user_id, $data) {
    if (empty($data['event_id'])) {
        echo json_encode(['success' => false, 'message' => 'Missing event_id']);
        return;
    }
    
    $platform = $data['platform'] ?? 'internal';
    
    $stmt = $pdo->prepare("INSERT INTO event_shares (event_id, user_id, platform) VALUES (?, ?, ?)");
    $stmt->execute([$data['event_id'], $user_id, $platform]);
    
    echo json_encode(['success' => true, 'message' => 'Event shared successfully']);
}
?>