<?php

namespace app\util;

use app\model\CompanyFeishuApp;
use Exception;

/**
 * 飞书授权工具类
 * 处理飞书 OAuth 相关操作
 */
class FeishuUtil
{
    // Token 缓存（生产环境应使用 Redis）
    private static array $tokenCache = [];

    // 飞书 API 端点
    private const string APP_ACCESS_TOKEN_URL = 'https://open.feishu.cn/open-apis/auth/v3/tenant_access_token/internal';
    private const string USER_ACCESS_TOKEN_URL = 'https://open.feishu.cn/open-apis/authen/v1/oidc/access_token';
    private const string USER_INFO_URL = 'https://open.feishu.cn/open-apis/authen/v1/user_info';

    /**
     * 获取 app_access_token
     *
     * @param int $appId 飞书应用ID
     * @return string app_access_token
     * @throws Exception
     */
    public static function getAppAccessToken(int $appId): string
    {
        $cacheKey = "feishu:app_access_token:{$appId}";

        // 从缓存获取
        if (isset(self::$tokenCache[$cacheKey]) && self::$tokenCache[$cacheKey]['expire'] > time()) {
            return self::$tokenCache[$cacheKey]['token'];
        }

        // 获取应用配置
        $app = CompanyFeishuApp::find($appId);

        if (!$app || $app->status !== 1) {
            throw new Exception('飞书应用配置不存在或已禁用');
        }

        // 请求新的 token
        try {
            $response = HttpClient::httpPost(self::APP_ACCESS_TOKEN_URL, [
                'app_id' => $app->app_id,
                'app_secret' => $app->app_secret,
            ]);

            if ($response['code'] !== 0) {
                $errorMsg = $response['msg'] ?? $response['message'] ?? '未知错误';
                throw new Exception('获取 app_access_token 失败: ' . $errorMsg);
            }

            $token = $response['tenant_access_token'];
            $expire = $response['expire'] ?? 7200;

            // 缓存 token（提前5分钟过期）
            self::$tokenCache[$cacheKey] = [
                'token' => $token,
                'expire' => time() + $expire - 300,
            ];

            error_log("✅ 获取 app_access_token 成功: " . substr($token, 0, 30) . "...");

            return $token;
        } catch (Exception $e) {
            error_log("❌ 获取 app_access_token 失败: " . $e->getMessage());
            throw $e;
        }
    }

    /**
     * 使用 app_access_token 获取 user_access_token
     *
     * @param string $code 飞书授权码
     * @param int $appId 飞书应用ID
     * @return string user_access_token
     * @throws Exception
     */
    public static function getUserAccessToken(string $code, int $appId): string
    {
        $appAccessToken = self::getAppAccessToken($appId);
        $app = CompanyFeishuApp::find($appId);

        if (!$app || $app->status !== 1) {
            throw new Exception('飞书应用配置不存在或已禁用');
        }

        error_log("🔍 获取 user_access_token, auth_code: " . substr($code, 0, 10) . "...");
        error_log("🔍 使用 app_id: " . $app->app_id);
        error_log("👑 app_access_token: " . substr($appAccessToken, 0, 30) . "...");

        try {
            $response = HttpClient::httpPost(
                self::USER_ACCESS_TOKEN_URL,
                [
                    'grant_type' => 'authorization_code',
                    'client_id' => $app->app_id,
                    'client_secret' => $app->app_secret,
                    'code' => $code,
                ],
                [
                    'Authorization: Bearer ' . $appAccessToken,
                ]
            );

            error_log("📝 获取 user_access_token 响应: " . json_encode($response));

            if ($response['code'] !== 0) {
                $errorMsg = $response['msg'] ?? $response['message'] ?? '未知错误';
                throw new Exception('获取 user_access_token 失败: ' . $errorMsg);
            }

            if (!isset($response['data']['access_token'])) {
                throw new Exception('响应中缺少 access_token: ' . json_encode($response));
            }

            $userAccessToken = $response['data']['access_token'];
            error_log("✅ 获取 user_access_token 成功: " . substr($userAccessToken, 0, 20) . "...");

            return $userAccessToken;
        } catch (Exception $e) {
            error_log("❌ 获取 user_access_token 失败: " . $e->getMessage());
            throw $e;
        }
    }

    /**
     * 使用 user_access_token 获取用户信息
     *
     * @param string $userAccessToken user_access_token
     * @return array 用户信息
     * @throws Exception
     */
    public static function getUserInfo(string $userAccessToken): array
    {
        error_log("🔍 获取用户信息, user_access_token: " . substr($userAccessToken, 0, 20) . "...");

        try {
            $response = HttpClient::httpGet(
                self::USER_INFO_URL,
                [],
                [
                    'Authorization: Bearer ' . $userAccessToken,
                ]
            );

            error_log("📝 获取用户信息响应: " . json_encode($response));

            if ($response['code'] !== 0) {
                $errorMsg = $response['msg'] ?? $response['message'] ?? '未知错误';
                throw new Exception('获取用户信息失败: ' . $errorMsg);
            }

            $userInfo = $response['data'] ?? [];

            error_log("✅ 获取用户信息成功: " . ($userInfo['name'] ?? '未知'));

            return $userInfo;
        } catch (Exception $e) {
            error_log("❌ 获取用户信息失败: " . $e->getMessage());
            throw $e;
        }
    }

    /**
     * 清除指定应用的 token 缓存
     *
     * @param int $appId 飞书应用ID
     */
    public static function clearTokenCache(int $appId): void
    {
        $cacheKey = "feishu:app_access_token:{$appId}";
        unset(self::$tokenCache[$cacheKey]);
        error_log("🗑️ 已清除应用 {$appId} 的 token 缓存");
    }

    /**
     * 清除所有 token 缓存
     */
    public static function clearAllTokenCache(): void
    {
        self::$tokenCache = [];
        error_log("🗑️ 已清除所有 token 缓存");
    }

    /**
     * 获取完整的用户信息（一步完成整个授权流程）
     *
     * @param string $code 飞书授权码
     * @param int $appId 飞书应用ID
     * @return array 用户信息
     * @throws Exception
     */
    public static function getCompleteUserInfo(string $code, int $appId): array
    {
        $userAccessToken = self::getUserAccessToken($code, $appId);
        return self::getUserInfo($userAccessToken);
    }
}