<?php


namespace App\Models;


class UserSession extends BaseModel
{
    public const IDLE_SECONDS = 86400;
    public const LAST_ACTIVITY_SQL = 'CASE WHEN update_time > 0 THEN update_time ELSE create_time END';
    protected $table = 'user_session';
    protected $fillable = ['user_id', 'token', 'expire_time'];
    
    public $timestamps = true;
    protected $dateFormat = 'U'; // U 代表 UNIX 时间戳（int）

    // 2. 修改创建时间字段名为 create_time
    const CREATED_AT = 'create_time';
    const UPDATED_AT = 'update_time';
    
    public static function setToken($userId)
    {
        $time = now()->getTimestamp();
        $userSession = UserSession::where('user_id', $userId)->first();

        //获取token延长过期的时间
        $expireTime = $time + self::IDLE_SECONDS;
        $token = create_token($userId);
        //token处理
        if ($userSession) {
            
            //重新获取token
            $userSession->token = $token;
            $userSession->expire_time = $expireTime;
            $userSession->update_time = $time;
            $userSession->save();
        } else {
            //找不到在该终端的token记录，创建token记录
            $userSession = UserSession::create([
                'user_id' => $userId,
                'token' => $token,
                'expire_time' => $expireTime
            ]);
        }
        return $token;
    }

    public static function validUntil(array $session): int
    {
        $lastActivity = (int)($session['update_time'] ?? 0);
        if ($lastActivity <= 0) $lastActivity = (int)($session['create_time'] ?? 0);
        return $lastActivity > 0 ? min((int)($session['expire_time'] ?? 0), $lastActivity + self::IDLE_SECONDS) : 0;
    }

    /** Renew only the same still-active token; never move the activity clock backwards. */
    public static function renewActiveToken(string $token, int $time, ?int $sessionId = null): ?self
    {
        if ($token === '') return null;
        $sessionId = $sessionId ?? static::where('token', $token)->value('id');
        if (!$sessionId) return null;
        static::where('id', $sessionId)->where('token', $token)->where('expire_time', '>', $time)
            ->whereRaw(self::LAST_ACTIVITY_SQL . ' > (? + 0)', [$time - self::IDLE_SECONDS])
            ->whereRaw(self::LAST_ACTIVITY_SQL . ' < (? + 0)', [$time])
            ->update(['expire_time' => $time + self::IDLE_SECONDS, 'update_time' => $time]);
        $session = static::where('id', $sessionId)->where('token', $token)->where('expire_time', '>', $time)->first();
        return $session && self::validUntil($session->getAttributes()) > $time ? $session : null;
    }
}