<?php
// ===== НАСТРОЙКИ =====
header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST');
header('Access-Control-Allow-Headers: Content-Type');

// Папка для хранения данных
$roomsDir = __DIR__ . '/rooms_data';

// Создаём папку, если её нет
if (!is_dir($roomsDir)) {
    mkdir($roomsDir, 0755, true);
}

// ===== ФУНКЦИИ =====
function getRoomFile($roomId) {
    global $roomsDir;
    return $roomsDir . '/room_' . $roomId . '.json';
}

function getChatFile($roomId) {
    global $roomsDir;
    return $roomsDir . '/chat_' . $roomId . '.json';
}

function getUsersFile($roomId) {
    global $roomsDir;
    return $roomsDir . '/users_' . $roomId . '.json';
}

function loadRoom($roomId) {
    $file = getRoomFile($roomId);
    if (!file_exists($file)) {
        return null;
    }
    return json_decode(file_get_contents($file), true);
}

function saveRoom($roomId, $data) {
    $file = getRoomFile($roomId);
    file_put_contents($file, json_encode($data));
}

function loadChat($roomId) {
    $file = getChatFile($roomId);
    if (!file_exists($file)) {
        return [];
    }
    return json_decode(file_get_contents($file), true) ?: [];
}

function saveChat($roomId, $messages) {
    $file = getChatFile($roomId);
    if (count($messages) > 200) {
        $messages = array_slice($messages, -200);
    }
    file_put_contents($file, json_encode($messages));
}

function loadUsers($roomId) {
    $file = getUsersFile($roomId);
    if (!file_exists($file)) {
        return [];
    }
    return json_decode(file_get_contents($file), true) ?: [];
}

function saveUsers($roomId, $users) {
    $file = getUsersFile($roomId);
    file_put_contents($file, json_encode($users));
}

function respond($data) {
    echo json_encode($data);
    exit;
}

function respondError($message) {
    respond(['success' => false, 'error' => $message]);
}

function respondSuccess($data = []) {
    $data['success'] = true;
    respond($data);
}

// ===== ОБРАБОТКА ЗАПРОСОВ =====
$action = $_GET['action'] ?? '';
$roomId = $_GET['room_id'] ?? '';

if (empty($roomId)) {
    respondError('Не указан ID комнаты');
}

$room = loadRoom($roomId);
if (!$room) {
    respondError('Комната не найдена');
}

$input = json_decode(file_get_contents('php://input'), true) ?: [];

switch ($action) {
    case 'get_state':
        respondSuccess([
            'state' => [
                'video_url' => $room['video_url'],
                'current_time' => $room['current_time'],
                'is_playing' => $room['is_playing'],
                'last_update' => $room['last_update']
            ]
        ]);
        break;
    
    case 'update_time':
        $adminToken = $input['admin_token'] ?? '';
        
        if ($adminToken !== $room['admin_token']) {
            respondError('Недостаточно прав');
        }
        
        $room['current_time'] = (float)($input['current_time'] ?? $room['current_time']);
        $room['is_playing'] = (bool)($input['is_playing'] ?? $room['is_playing']);
        $room['last_update'] = time();
        
        saveRoom($roomId, $room);
        
        respondSuccess([
            'state' => [
                'current_time' => $room['current_time'],
                'is_playing' => $room['is_playing']
            ]
        ]);
        break;
    
    case 'video_command':
        $adminToken = $input['admin_token'] ?? '';
        
        if ($adminToken !== $room['admin_token']) {
            respondError('Недостаточно прав');
        }
        
        $command = $input['command'] ?? '';
        $value = $input['value'] ?? null;
        
        switch ($command) {
            case 'play':
                $room['is_playing'] = true;
                if ($value !== null) {
                    $room['current_time'] = (float)$value;
                }
                break;
                
            case 'pause':
                $room['is_playing'] = false;
                if ($value !== null) {
                    $room['current_time'] = (float)$value;
                }
                break;
                
            case 'seek':
                if ($value !== null) {
                    $room['current_time'] = (float)$value;
                }
                break;
                
            default:
                respondError('Неизвестная команда');
        }
        
        $room['last_update'] = time();
        saveRoom($roomId, $room);
        
        respondSuccess([
            'state' => [
                'current_time' => $room['current_time'],
                'is_playing' => $room['is_playing']
            ]
        ]);
        break;
    
    case 'get_chat':
        $messages = loadChat($roomId);
        respondSuccess(['messages' => $messages]);
        break;
    
    case 'send_message':
        $nick = $input['nick'] ?? '';
        $text = $input['text'] ?? '';
        $isAdmin = (bool)($input['is_admin'] ?? false);
        
        if (empty($nick) || empty($text)) {
            respondError('Пустое сообщение');
        }
        
        $messages = loadChat($roomId);
        $messages[] = [
            'nick' => mb_substr($nick, 0, 20),
            'text' => mb_substr($text, 0, 500),
            'time' => date('H:i'),
            'is_admin' => $isAdmin,
            'timestamp' => time()
        ];
        
        saveChat($roomId, $messages);
        
        respondSuccess(['message' => end($messages)]);
        break;
    
    case 'register_user':
        $nick = $input['nick'] ?? '';
        
        if (empty($nick)) {
            respondError('Пустой ник');
        }
        
        $users = loadUsers($roomId);
        $sessionId = bin2hex(random_bytes(8));
        
        $found = false;
        foreach ($users as &$user) {
            if ($user['nick'] === $nick) {
                $user['last_seen'] = time();
                $user['session_id'] = $sessionId;
                $found = true;
                break;
            }
        }
        
        if (!$found) {
            $users[] = [
                'nick' => mb_substr($nick, 0, 20),
                'session_id' => $sessionId,
                'joined_at' => time(),
                'last_seen' => time()
            ];
        }
        
        $users = array_filter($users, function($user) {
            return (time() - $user['last_seen']) < 60;
        });
        
        saveUsers($roomId, array_values($users));
        
        respondSuccess(['count' => count($users)]);
        break;
    
    case 'get_users':
        $users = loadUsers($roomId);
        
        $activeUsers = array_filter($users, function($user) {
            return (time() - $user['last_seen']) < 60;
        });
        
        if (count($activeUsers) !== count($users)) {
            saveUsers($roomId, array_values($activeUsers));
        }
        
        respondSuccess([
            'count' => count($activeUsers),
            'users' => array_values($activeUsers)
        ]);
        break;
    
    default:
        respondError('Неизвестное действие');
}
?>