<?php

namespace app\common\controller;

use app\common\traits\ResponseTrait;
use support\Request;
use support\Response;
use app\common\utils\SystemAuth;
use app\common\utils\Jwt;
use app\common\model\User;
use app\common\model\Systems;
use support\Redis;

class SystemController
{
    use ResponseTrait;

    protected $noNeedLogin = ['auth'];

    protected $noNeedHeaderData = ['auth'];
    /**
     * 系统间认证接口
     * POST /api/system/auth
     */
    public function auth(Request $request): Response
    {
        $userId = $request->post('user_id');
        $timestamp = (int)$request->post('timestamp');
        $signature = $request->post('signature');
        $systemCode = $request->post('system_code');

        // 参数验证
        if (empty($userId) || empty($timestamp) || empty($signature)) {
            return $this->error('参数不完整', 400);
        }

        // 获取配置
        $secret = config('system_auth.shared_secret');
        $expire = config('system_auth.signature_expire', 600);

        // 验证时间戳（10分钟有效期）
        if (!SystemAuth::verifyTimestamp($timestamp, $expire)) {
            return $this->error('请求已过期', 401);
        }

        // 验证签名
        if (!SystemAuth::verifySignature($userId, $timestamp, $signature, $secret)) {
            return $this->error('签名验证失败', 401);
        }

        // 查找用户
        $user = User::find($userId);
        if (!$user) {
            return $this->error('用户不存在', 404);
        }

        // 验证系统（如果提供了 system_code）
        $system = null;
        if ($systemCode) {
            $system = Systems::where('code', $systemCode)->first();
            if (!$system) {
                return $this->error('系统不存在', 404);
            }
        }

        // 获取 corp_abbr（优先从请求参数获取，否则通过用户 corp_id 查询）
        $corpAbbr = $request->post('corp_abbr');
        if (!$corpAbbr && $user->corp_id) {
            $corp = \app\common\model\Corp::find($user->corp_id);
            $corpAbbr = $corp ? $corp->abbr : '';
        }

        // 构建 JWT payload
        $payload = $this->buildJwtPayload($user, $system);

        // 生成 access_token
        $jwt = new Jwt();
        $token = $jwt->generateToken($payload);

        // 生成 refresh_token
        $refreshToken = $this->generateRefreshToken($user->id, $systemCode ?? '');

        // 获取 home_url
        $homeUrl = $system ? $this->getHome($system->id, $payload) : '';

        // 记录 token 到 Redis 和 MySQL
        $this->recordUserToken($user->id, $token, $systemCode ?? '');

        // 构建用户信息（去除敏感信息）
        $userInfo = [
            'id'       => $user->id,
            'sn'       => $user->sn ?? '',
            'name'     => $user->name ?? '',
            'avatar'   => $user->avatar ?? '',
            'phone'    => $user->phone ?? '',
            'email'    => $user->email ?? '',
            'sex'      => $user->sex ?? '',
            'position' => $user->position ?? '',
            'status'   => $user->status ?? 1,
            'corp_id'  => $user->corp_id,
        ];

        return $this->success([
            'access_token'  => $token,
            'refresh_token' => $refreshToken,
            'expires_in'    => config('jwt.jwt_expiration'),
            'system_code'   => $systemCode ?? '',
            'corp_abbr'     => $corpAbbr ?? '',
            'login_type'    => 'system',
            'home_url'      => $homeUrl,
            'user_info'     => $userInfo,
        ], '认证成功');
    }

    /**
     * 构建 JWT payload
     */
    private function buildJwtPayload(User $user, ?Systems $system): array
    {
        $payload = [
            'user_id' => $user->id,
            'sn'      => $user->sn ?? '',
            'name'    => $user->name ?? '',
            'iat'     => time(),
            'exp'     => time() + config('jwt.jwt_expiration'),
        ];

        if ($system) {
            $payload['system_code'] = $system->code;
            $payload['system_id'] = $system->id;
        }

        return $payload;
    }

    /**
     * 生成 refresh_token
     */
    private function generateRefreshToken(int $userId, string $systemCode): string
    {
        $refreshToken = bin2hex(random_bytes(32));

        // 存储到 Redis
        $key = "refresh_token:{$refreshToken}";
        $expire = config('jwt.jwt_refresh_token_expiration');
        Redis::setex($key, $expire, json_encode([
            'user_id' => $userId,
            'system_code' => $systemCode,
        ]));

        return $refreshToken;
    }

    /**
     * 获取用户首页地址
     */
    private function getHome(int $systemId, array $payload): string
    {
        // 简单实现，可以根据实际需求调整
        return '';
    }

    /**
     * 记录用户token到 Redis 和 MySQL
     */
    private function recordUserToken(int $userId, string $token, string $systemCode): void
    {
        $request = request();
        $ip = $request ? $request->getRealIp() : '';
        $ua = $request ? $request->header('user-agent', '') : '';
        $now = time();
        $expireAt = $now + config('jwt.jwt_expiration');

        // Redis Set 用户token集合
        Redis::sAdd("user_tokens:{$userId}:{$systemCode}", $token);
        Redis::expire("user_tokens:{$userId}:{$systemCode}", config('jwt.jwt_expiration'));

        // Redis Hash token元信息
        $meta = [
            'system_code' => $systemCode,
            'login_ip'    => $ip,
            'user_agent'  => $ua,
            'login_time'  => $now,
            'expired_at'  => $expireAt,
        ];
        Redis::hMSet("user_token_meta:{$token}", $meta);
        Redis::expire("user_token_meta:{$token}", config('jwt.jwt_expiration'));

        // MySQL 持久化
        \app\common\model\UserTokenLog::create([
            'user_id'     => $userId,
            'token'       => $token,
            'system_code' => $systemCode,
            'login_ip'    => $ip,
            'user_agent'  => $ua,
            'expired_at'  => date('Y-m-d H:i:s', $expireAt),
        ]);
    }
}