<?php
declare(strict_types=1);

namespace app\api\service;

use app\api\common\Jwt;
use app\api\model\Member;

/**
 * 认证服务
 * 处理用户登录、注册、Token 管理等
 */
class AuthService
{
    /**
     * 用户登录
     * @param string $username 用户名
     * @param string $password 密码
     * @return array
     * @throws \Exception
     */
    public function login(string $username, string $password): array
    {
        // 查找用户
        $member = Member::findByUsername($username);
        if (!$member) {
            throw new \Exception('用户名或密码错误', 4001);
        }

        // 检查是否被禁用
        if ($member->isDisabled()) {
            $member->logLogin(false, 'password');
            throw new \Exception('账号已被禁用', 4002);
        }

        // 验证密码
        if (!$member->verifyPassword($password)) {
            $member->logLogin(false, 'password');
            throw new \Exception('用户名或密码错误', 4001);
        }

        // 检查是否过期
        if ($member->isExpired()) {
            $member->logLogin(false, 'password');
            throw new \Exception('账号已过期，请联系客服续费', 4003);
        }

        // 记录登录日志
        $member->logLogin(true, 'password');

        // 生成 Token
        $token = Jwt::encode([
            'userid' => $member->userid,
            'username' => $member->username,
            'v_type' => $member->v_type,
        ]);

        $refreshToken = Jwt::refreshToken($member->userid);

        // 返回用户信息
        return [
            'token' => $token,
            'refresh_token' => $refreshToken,
            'expires_in' => config('jwt.expire', 604800),
            'user' => [
                'userid' => $member->userid,
                'username' => $member->username,
                'v_type' => $member->v_type,
                'endtime' => $member->endtime,
                'formtypeid' => $member->formtypeid,
            ],
        ];
    }

    /**
     * 用户注册
     * @param string $username 用户名
     * @param string $password 密码
     * @param string|null $email 邮箱
     * @param int|null $formtypeid 代理商ID
     * @return array
     * @throws \Exception
     */
    public function register(string $username, string $password, ?string $email = null, ?int $formtypeid = null): array
    {
        // 检查用户名是否已存在
        $exists = Member::findByUsername($username);
        if ($exists) {
            throw new \Exception('用户名已存在', 4004);
        }

        // 创建用户
        $member = new Member();
        $member->username = $username;
        $member->password = Member::makePassword($password);
        $member->email = $email;
        $member->formtypeid = $formtypeid ?? 0;
        $member->v_type = 0; // 默认套餐
        $member->disabled = 0;
        $member->endtime = 0;
        $member->regtime = time();
        $member->regip = request()->ip();

        if (!$member->save()) {
            throw new \Exception('注册失败，请稍后重试', 5001);
        }

        // 自动登录
        return $this->login($username, $password);
    }

    /**
     * 刷新 Token
     * @param string $refreshToken
     * @return array
     * @throws \Exception
     */
    public function refreshToken(string $refreshToken): array
    {
        $payload = Jwt::decode($refreshToken);
        if (!$payload || ($payload['type'] ?? '') !== 'refresh') {
            throw new \Exception('无效的刷新令牌', 4005);
        }

        $member = Member::findByUserid($payload['userid']);
        if (!$member || $member->isDisabled()) {
            throw new \Exception('用户不存在或已被禁用', 4002);
        }

        // 生成新 Token
        $token = Jwt::encode([
            'userid' => $member->userid,
            'username' => $member->username,
            'v_type' => $member->v_type,
        ]);

        return [
            'token' => $token,
            'expires_in' => config('jwt.expire', 604800),
        ];
    }

    /**
     * 获取用户信息
     * @param int $userid
     * @return array
     * @throws \Exception
     */
    public function getUserInfo(int $userid): array
    {
        $member = Member::findByUserid($userid);
        if (!$member) {
            throw new \Exception('用户不存在', 4006);
        }

        // 获取套餐信息
        $productInfo = $member->getProductInfo();

        return [
            'userid' => $member->userid,
            'username' => $member->username,
            'v_type' => $member->v_type,
            'endtime' => $member->endtime,
            'formtypeid' => $member->formtypeid,
            'disabled' => $member->disabled,
            'product' => $productInfo ? [
                'v_type' => $productInfo['v_type'] ?? null,
                'video_num' => $productInfo['video_num'] ?? 0,
                'account_num' => $productInfo['account_num'] ?? 0,
            ] : null,
        ];
    }

    /**
     * 修改密码
     * @param int $userid
     * @param string $oldPassword
     * @param string $newPassword
     * @return bool
     * @throws \Exception
     */
    public function changePassword(int $userid, string $oldPassword, string $newPassword): bool
    {
        $member = Member::findByUserid($userid);
        if (!$member) {
            throw new \Exception('用户不存在', 4006);
        }

        if (!$member->verifyPassword($oldPassword)) {
            throw new \Exception('原密码错误', 4007);
        }

        $member->password = Member::makePassword($newPassword);
        return $member->save();
    }
}