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

$method = $_SERVER['REQUEST_METHOD'];
$db = db();

if ($method === 'POST') {
    if (isset($_POST['action'])) {
        $action = $_POST['action'];
        $id = (int)($_POST['id'] ?? 0);

        if ($id <= 0) {
            echo json_encode(['success' => false, 'error' => 'ID inválido']);
            exit;
        }

        try {
            if ($action === 'mark_played') {
                $stmt = $db->prepare("UPDATE song_requests SET status = 'played' WHERE id = ?");
                $stmt->execute([$id]);
                echo json_encode(['success' => true]);
            } elseif ($action === 'delete') {
                $stmt = $db->prepare("DELETE FROM song_requests WHERE id = ?");
                $stmt->execute([$id]);
                echo json_encode(['success' => true]);
            } else {
                echo json_encode(['success' => false, 'error' => 'Acción no reconocida']);
            }
        } catch (Exception $e) {
            echo json_encode(['success' => false, 'error' => $e->getMessage()]);
        }
        exit;
    }

    $artist = trim($_POST['artist'] ?? '');
    $song = trim($_POST['song'] ?? '');
    $requester = trim($_POST['requester'] ?? 'Anónimo');

    if (empty($artist) || empty($song)) {
        echo json_encode(['success' => false, 'error' => 'Falta artista o canción']);
        exit;
    }

    try {
        $stmt = $db->prepare("INSERT INTO song_requests (artist, song, requester) VALUES (?, ?, ?)");
        $stmt->execute([$artist, $song, $requester]);
        echo json_encode(['success' => true]);
    } catch (Exception $e) {
        echo json_encode(['success' => false, 'error' => $e->getMessage()]);
    }
    exit;
}

if ($method === 'GET') {
    $action = $_GET['action'] ?? 'list';

    if ($action === 'stats') {
        try {
            // Top artists
            $stmt = $db->query("SELECT artist, COUNT(*) as count FROM song_requests GROUP BY artist ORDER BY count DESC LIMIT 5");
            $top_artists = $stmt->fetchAll();

            // Top songs
            $stmt = $db->query("SELECT artist, song, COUNT(*) as count FROM song_requests GROUP BY artist, song ORDER BY count DESC LIMIT 5");
            $top_songs = $stmt->fetchAll();

            // Request volume by hour (last 24 hours)
            $stmt = $db->query("SELECT HOUR(created_at) as hour, COUNT(*) as count FROM song_requests WHERE created_at > DATE_SUB(NOW(), INTERVAL 24 HOUR) GROUP BY hour ORDER BY hour ASC");
            $volume_stats = $stmt->fetchAll();

            echo json_encode([
                'success' => true,
                'top_artists' => $top_artists,
                'top_songs' => $top_songs,
                'volume_stats' => $volume_stats
            ]);
        } catch (Exception $e) {
            echo json_encode(['success' => false, 'error' => $e->getMessage()]);
        }
        exit;
    }

    try {
        // Auto-archive requests older than 2 hours (7200 seconds)
        $db->query("UPDATE song_requests SET status = 'played' WHERE status = 'pending' AND created_at < (NOW() - INTERVAL 2 HOUR)");

        $status = $_GET['status'] ?? 'pending';
        $limit = isset($_GET['limit']) ? (int)$_GET['limit'] : 10;
        
        if ($status === 'all') {
            $stmt = $db->query("SELECT * FROM song_requests ORDER BY created_at DESC LIMIT $limit");
        } else {
            $stmt = $db->prepare("SELECT * FROM song_requests WHERE status = ? ORDER BY created_at DESC LIMIT $limit");
            $stmt->execute([$status]);
        }
        
        $requests = $stmt->fetchAll();
        echo json_encode(['success' => true, 'requests' => $requests]);
    } catch (Exception $e) {
        echo json_encode(['success' => false, 'requests' => [], 'error' => $e->getMessage()]);
    }
    exit;
}