<?php
/**
 * Web 游戏服务器入口
 * 使用方法: php -S 0.0.0.0:8080 web/server.php
 */

// 设置错误报告
error_reporting(E_ALL);
ini_set('display_errors', 0);

// 自动加载
require_once __DIR__ . '/../vendor/autoload.php';

use Game\Core\UserManager;
use Game\Core\GameSession;
use Game\Core\WebInput;

// 设置 Web 模式
WebInput::getInstance()->setWebMode(true);

// 启动会话
session_start();

// 设置响应头
header('Content-Type: application/json; charset=utf-8');
header('Access-Control-Allow-Origin: *');
header('Access-Control-Allow-Methods: GET, POST, OPTIONS');
header('Access-Control-Allow-Headers: Content-Type');

// 处理 OPTIONS 预检请求
if ($_SERVER['REQUEST_METHOD'] === 'OPTIONS') {
    http_response_code(200);
    exit;
}

// 获取请求路径
$requestUri = $_SERVER['REQUEST_URI'];
$path = parse_url($requestUri, PHP_URL_PATH);

// 静态文件处理
if ($path === '/' || $path === '/game-ws.html') {
    header('Content-Type: text/html; charset=utf-8');
    readfile(__DIR__ . '/game-ws.html');
    exit;
}

// API 路由
$response = ['success' => false, 'message' => '未知请求'];

try {
    switch ($path) {
        case '/api/register':
            $response = handleRegister();
            break;

        case '/api/login':
            $response = handleLogin();
            break;

        case '/api/logout':
            $response = handleLogout();
            break;

        case '/api/status':
            $response = handleStatus();
            break;

        case '/api/game/render':
            $response = handleGameRender();
            break;

        case '/api/game/input':
            $response = handleGameInput();
            break;

        case '/api/game/battle-stream':
            // SSE 实时战斗流
            handleBattleStream();
            exit;
            break;

        default:
            // 检查是否是静态文件
            $filePath = __DIR__ . $path;
            if (file_exists($filePath) && is_file($filePath)) {
                $ext = pathinfo($path, PATHINFO_EXTENSION);
                $mimeTypes = [
                    'js' => 'application/javascript',
                    'css' => 'text/css',
                    'html' => 'text/html',
                    'png' => 'image/png',
                    'jpg' => 'image/jpeg',
                    'gif' => 'image/gif',
                ];
                header('Content-Type: ' . ($mimeTypes[$ext] ?? 'application/octet-stream'));
                readfile($filePath);
                exit;
            }
            http_response_code(404);
            $response = ['success' => false, 'message' => '未找到'];
    }
} catch (Exception $e) {
    http_response_code(500);
    $response = ['success' => false, 'message' => '服务器错误: ' . $e->getMessage()];
}

echo json_encode($response, JSON_UNESCAPED_UNICODE);

// ============ 处理函数 ============

function getInput(): array
{
    $input = file_get_contents('php://input');
    return json_decode($input, true) ?? [];
}

function handleRegister(): array
{
    $data = getInput();
    $username = $data['username'] ?? '';
    $password = $data['password'] ?? '';

    $userManager = new UserManager();
    $result = $userManager->register($username, $password);

    if ($result['success']) {
        $_SESSION['user_id'] = $result['userId'];
        $_SESSION['username'] = $username;
    }

    return $result;
}

function handleLogin(): array
{
    $data = getInput();
    $username = $data['username'] ?? '';
    $password = $data['password'] ?? '';

    $userManager = new UserManager();
    $result = $userManager->login($username, $password);

    if ($result['success']) {
        $_SESSION['user_id'] = $result['userId'];
        $_SESSION['username'] = $username;
    }

    return $result;
}

function handleLogout(): array
{
    session_destroy();
    return ['success' => true, 'message' => '已退出登录'];
}

function handleStatus(): array
{
    if (empty($_SESSION['user_id'])) {
        return ['success' => false, 'loggedIn' => false, 'message' => '未登录'];
    }

    return [
        'success' => true,
        'loggedIn' => true,
        'userId' => $_SESSION['user_id'],
        'username' => $_SESSION['username'] ?? '未知',
    ];
}

function handleGameRender(): array
{
    if (empty($_SESSION['user_id'])) {
        return ['success' => false, 'message' => '请先登录'];
    }

    $session = new GameSession($_SESSION['user_id']);
    $output = $session->render();
    $stateInfo = $session->getStateInfo();

    return [
        'success' => true,
        'output' => $output,
        'state' => $stateInfo['state'],
        'stateName' => $stateInfo['stateName'],
        'playerInfo' => $stateInfo['playerInfo'],
    ];
}

function handleGameInput(): array
{
    if (empty($_SESSION['user_id'])) {
        return ['success' => false, 'message' => '请先登录'];
    }

    $data = getInput();
    $input = $data['input'] ?? '';

    $session = new GameSession($_SESSION['user_id']);
    $result = $session->handleInput($input);

    // 现在handleInput返回的是数组：output, state, stateName, playerInfo
    return array_merge(['success' => true], $result);
}

/**
 * 处理 SSE 实时战斗流
 */
function handleBattleStream(): void
{
    if (empty($_SESSION['user_id'])) {
        http_response_code(401);
        echo "data: " . json_encode(['error' => '请先登录']) . "\n\n";
        return;
    }

    // 从URL参数或POST数据获取输入
    $input = $_GET['input'] ?? $_POST['input'] ?? '';

    // 设置 SSE 响应头
    header('Content-Type: text/event-stream');
    header('Cache-Control: no-cache');
    header('Connection: keep-alive');
    header('X-Accel-Buffering: no'); // 禁用代理缓冲

    // 发送初始化消息
    echo "event: start\n";
    echo "data: " . json_encode(['message' => '战斗开始']) . "\n\n";
    ob_flush();
    flush();

    // 创建游戏会话并流式处理战斗
    try {
        $session = new GameSession($_SESSION['user_id']);
        $session->streamBattle($input);
    } catch (Exception $e) {
        echo "event: error\n";
        echo "data: " . json_encode(['message' => $e->getMessage()]) . "\n\n";
        ob_flush();
        flush();
    }
}