<?php
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namespace app\adminapi\service;

use app\common\cache\AdminTokenCache;
use app\common\enum\AdminTerminalEnum;
use app\common\model\auth\Admin;
use app\common\model\auth\AdminSession;
use think\facade\Config;

/**
 * 管理员token
 * Class AdminTokenService
 * @package app\adminapi\service
 */
class AdminTokenService
{
    public static function expireDuration($terminal): int
    {
        return (int) Config::get((int) $terminal === AdminTerminalEnum::BCR
            ? 'project.admin_token.bcr_expire_duration' : 'project.admin_token.expire_duration',
            (int) $terminal === AdminTerminalEnum::BCR ? 86400 * 180 : 3600 * 8);
    }

    public static function renewalWindow($terminal): int
    {
        return (int) Config::get((int) $terminal === AdminTerminalEnum::BCR
            ? 'project.admin_token.bcr_be_expire_duration' : 'project.admin_token.be_expire_duration',
            (int) $terminal === AdminTerminalEnum::BCR ? 86400 * 150 : 3600);
    }

    /** 与改密同一事务调用；只撤销 BCR，会话有效性由 DB 决定，旧缓存不能续活。 */
    public static function revokeBcrSessions(int $adminId): void
    {
        AdminSession::where('admin_id', $adminId)->where('terminal', AdminTerminalEnum::BCR)
            ->update(['expire_time' => time() - 1, 'update_time' => time()]);
    }

    /**
     * @notes 设置或更新管理员token
     * @param $adminId //管理员id
     * @param $terminal //多终端名称
     * @param $multipointLogin //是否支持多处登录
     * @return false|mixed
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\DbException
     * @throws \think\db\exception\ModelNotFoundException
     * @author 令狐冲
     * @date 2021/7/2 20:25
     */
    public static function setToken($adminId, $terminal, $multipointLogin = 1)
    {
        $time = time();
        $adminSession = AdminSession::where([['admin_id', '=', $adminId], ['terminal', '=', $terminal]])->find();

        //获取token延长过期的时间
        $expireTime = $time + self::expireDuration($terminal);
        $adminTokenCache = new AdminTokenCache();

        //token处理
        if ($adminSession) {
            if ($adminSession->expire_time < $time || $multipointLogin === 0
                || ((int) $terminal === AdminTerminalEnum::BCR && (int) $adminSession->expire_time === $time)) {
                //清空缓存
                $adminTokenCache->deleteAdminInfo($adminSession->token);
                //如果token过期或账号设置不支持多处登录，更新token
                $adminSession->token = create_token($adminId);
            }
            $adminSession->expire_time = $expireTime;
            $adminSession->update_time = $time;

            $adminSession->save();
        } else {
            //找不到在该终端的token记录，创建token记录
            $adminSession = AdminSession::create([
                'admin_id' => $adminId,
                'terminal' => $terminal,
                'token' => create_token($adminId),
                'expire_time' => $expireTime
            ]);
        }

        return $adminTokenCache->setAdminInfo($adminSession->token);
    }

    /**
     * @notes 延长token过期时间
     * @param $token
     * @return array|false|mixed
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\DbException
     * @throws \think\db\exception\ModelNotFoundException
     * @author 令狐冲
     * @date 2021/7/5 14:25
     */
    public static function overtimeToken($token)
    {
        $time = time();
        $adminSession = AdminSession::where('token', '=', $token)->findOrEmpty();
        if ($adminSession->isEmpty()) {
            return false;
        }
        if ((int) $adminSession->terminal === AdminTerminalEnum::BCR) {
            $previousExpiry = (int) $adminSession->expire_time;
            if ($previousExpiry <= $time || !Admin::where('id', $adminSession->admin_id)
                    ->where('disable', 0)->field('id')->find()) {
                return false;
            }
            // 比较读取时的有效期和 token；注销、改密或同端重登后不能把旧会话续活。
            // CAS 失败也可能是另一请求先续期，交给 DB 有效性校验区分。
            AdminSession::where('id', $adminSession->id)->where('token', $token)
                ->where('expire_time', $previousExpiry)->where('expire_time', '>', $time)
                ->update(['expire_time' => $time + self::expireDuration($adminSession->terminal), 'update_time' => $time]);
            return (new AdminTokenCache())->setAdminInfo($token);
        }
        //延长token过期时间
        $adminSession->expire_time = $time + self::expireDuration($adminSession->terminal);
        $adminSession->update_time = $time;
        $adminSession->save();
        return (new AdminTokenCache())->setAdminInfo($adminSession->token);
    }

    /**
     * @notes 设置token为过期
     * @param $token
     * @return bool
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\DbException
     * @throws \think\db\exception\ModelNotFoundException
     * @author 令狐冲
     * @date 2021/7/5 14:31
     */
    public static function expireToken($token)
    {
        $adminSession = AdminSession::where('token', '=', $token)
            ->with('admin')
            ->findOrEmpty();

        if ($adminSession->isEmpty()) {
            return false;
        }

        // 其他终端保留多处登录的原有退出语义。
        // BCR 必须注销；同账号多台 BCR 复用一个 token 时，这些设备会一起失效。
        if ((int) $adminSession->terminal !== AdminTerminalEnum::BCR
            && $adminSession->admin->multipoint_login === 1) {
            return false;
        }

        $time = time();
        if ((int) $adminSession->terminal === AdminTerminalEnum::BCR) {
            // 只注销调用者持有的 token，不能误伤并发重登后替换到同一行的新 token。
            AdminSession::where('id', $adminSession->id)->where('token', $token)
                ->update(['expire_time' => $time - 1, 'update_time' => $time]);
        } else {
            $adminSession->expire_time = $time;
            $adminSession->update_time = $time;
            $adminSession->save();
        }

        return (new AdminTokenCache())->deleteAdminInfo($token);
    }

}