<?php
header('Content-Type: application/json');
require_once __DIR__ . '/../db/config.php';

try {
    $db = db();
    
    // 1. Check if there is an active "played" song within its duration (e.g. 5 minutes)
    $stmt = $db->query("SELECT COUNT(*) FROM song_requests WHERE status = 'played' AND created_at > DATE_SUB(NOW(), INTERVAL 5 MINUTE)");
    $hasActive = $stmt->fetchColumn();
    
    if ($hasActive == 0) {
        // 2. No active song? Let's take the oldest pending request and "execute" it
        $stmt = $db->query("SELECT * FROM song_requests WHERE status = 'pending' ORDER BY is_priority DESC, created_at ASC LIMIT 1");
        $next = $stmt->fetch();
        
        if ($next) {
            $stmt = $db->prepare("UPDATE song_requests SET status = 'played' WHERE id = ?");
            $stmt->execute([$next['id']]);
            
            // Log automation
            $db->prepare("INSERT INTO automation_logs (message) VALUES (?)")->execute(["Auto-DJ ejecutó: {$next['artist']} - {$next['song']}"]);
            
            // Announce in chat
            $chatMsg = "🤖 [AUTO-DJ] Es el turno de: **{$next['artist']} - {$next['song']}** (Pedido por: **{$next['requester']}**) 🎧🔥";
            $db->prepare("INSERT INTO messages (username, message, type) VALUES ('Sistema', ?, 'dj_power')")->execute([$chatMsg]);
            
            echo json_encode(['success' => true, 'action' => 'executed', 'song' => $next['song']]);
            exit;
        }
    }
    
    echo json_encode(['success' => true, 'action' => 'none']);
} catch (Exception $e) {
    echo json_encode(['success' => false, 'error' => $e->getMessage()]);
}