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<?php
/**
 * Get Audio Analysis Status
 * Returns count of tracks needing analysis
 */

require_once '../config/database.php';

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

try {
    $pdo = getDBConnection();
    
    // Count tracks needing analysis (using single source of truth: bpm + analysis_source)
    $stmt = $pdo->prepare("
        SELECT 
            COUNT(*) as total,
            COUNT(CASE WHEN JSON_EXTRACT(metadata, '$.bpm') IS NOT NULL 
                       AND JSON_EXTRACT(metadata, '$.analysis_source') IS NOT NULL 
                  THEN 1 END) as total_analyzed
        FROM music_tracks
        WHERE status = 'complete'
        AND audio_url IS NOT NULL
        AND audio_url != ''
    ");
    
    $stmt->execute();
    $stats = $stmt->fetch(PDO::FETCH_ASSOC);
    $totalNeedingAnalysis = (int)$stats['total'] - (int)$stats['total_analyzed'];
    
    // Get user's tracks needing analysis (if user_id provided)
    $user_id = $_GET['user_id'] ?? null;
    $whereClause = "mt.status = 'complete' 
                    AND mt.audio_url IS NOT NULL 
                    AND mt.audio_url != ''
                    AND (
                        JSON_EXTRACT(mt.metadata, '$.bpm') IS NULL
                        OR JSON_EXTRACT(mt.metadata, '$.bpm') = ''
                        OR JSON_EXTRACT(mt.metadata, '$.analysis_source') IS NULL
                        OR JSON_EXTRACT(mt.metadata, '$.analysis_source') = ''
                    )";
    
    if ($user_id) {
        $whereClause .= " AND mt.user_id = " . intval($user_id);
    }
    
    $stmt = $pdo->prepare("
        SELECT 
            mt.id,
            mt.title,
            mt.audio_url,
            u.name as artist_name,
            mt.user_id
        FROM music_tracks mt
        JOIN users u ON mt.user_id = u.id
        WHERE $whereClause
        ORDER BY mt.created_at DESC
        LIMIT 50
    ");
    
    $stmt->execute();
    $sample = $stmt->fetchAll(PDO::FETCH_ASSOC);
    
    echo json_encode([
        'success' => true,
        'stats' => [
            'needing_analysis' => $totalNeedingAnalysis,
            'already_analyzed' => (int)$stats['total_analyzed'],
            'total' => (int)$stats['total']
        ],
        'tracks' => $sample
    ]);
    
} catch (Exception $e) {
    echo json_encode([
        'success' => false,
        'error' => $e->getMessage()
    ]);
}