<?php

namespace app\admin\model\lottery;

use think\Model;

class UserChance extends Model
{
    // 表名
    protected $table = 'shop_lottery_user_chance';
    
    // 自动写入时间戳字段
    protected $autoWriteTimestamp = 'integer';

    // 定义时间戳字段名
    protected $createTime = 'createtime';
    protected $updateTime = 'updatetime';

    // 追加属性
    protected $append = [
        'source_type_text',
        'status_text',
        'expire_time_text',
        'remain_count'
    ];

    /**
     * 来源类型列表
     */
    public function getSourceTypeList()
    {
        return [
            '1' => __('购买商品'),
            '2' => __('订单消费'),
            '3' => __('充值'),
            '4' => __('累计消费'),
            '5' => __('管理员发放'),
            '6' => __('签到奖励'),
            '7' => __('邀请奖励'),
            '8' => __('活动奖励')
        ];
    }

    /**
     * 状态列表
     */
    public function getStatusList()
    {
        return [
            '0' => __('已失效'),
            '1' => __('有效')
        ];
    }

    // 获取器
    public function getSourceTypeTextAttr($value, $data)
    {
        $value = $value ? $value : (isset($data['source_type']) ? $data['source_type'] : '');
        $list = $this->getSourceTypeList();
        return isset($list[$value]) ? $list[$value] : '';
    }

    public function getStatusTextAttr($value, $data)
    {
        $value = $value ? $value : (isset($data['status']) ? $data['status'] : '');
        $list = $this->getStatusList();
        return isset($list[$value]) ? $list[$value] : '';
    }

    public function getExpireTimeTextAttr($value, $data)
    {
        $value = $value ? $value : (isset($data['expire_time']) ? $data['expire_time'] : '');
        if ($value && is_numeric($value)) {
            return date("Y-m-d H:i:s", $value);
        }
        return $value ?: '永不过期';
    }

    public function getRemainCountAttr($value, $data)
    {
        $chance_count = isset($data['chance_count']) ? $data['chance_count'] : 0;
        $used_count = isset($data['used_count']) ? $data['used_count'] : 0;
        return max(0, $chance_count - $used_count);
    }

    // 修改器
    protected function setExpireTimeAttr($value)
    {
        return $value === '' ? null : ($value && !is_numeric($value) ? strtotime($value) : $value);
    }

    // 关联关系
    public function activity()
    {
        return $this->belongsTo('Activity', 'activity_id', 'id');
    }

    public function user()
    {
        return $this->belongsTo('app\\common\\model\\User', 'user_id', 'id');
    }

    /**
     * 检查机会是否有效
     */
    public function isValid()
    {
        // 检查状态
        if ($this->status != 1) {
            return false;
        }
        
        // 检查是否过期
        if ($this->expire_time && $this->expire_time < time()) {
            return false;
        }
        
        // 检查是否还有剩余次数
        if ($this->chance_count <= $this->used_count) {
            return false;
        }
        
        return true;
    }

    /**
     * 使用抽奖机会
     */
    public function useChance()
    {
        if (!$this->isValid()) {
            return false;
        }
        
        $this->used_count += 1;
        return $this->save();
    }

    /**
     * 获取用户在指定活动的有效抽奖机会
     */
    public static function getUserValidChances($user_id, $activity_id)
    {
        return self::where([
            'user_id' => $user_id,
            'activity_id' => $activity_id,
            'status' => 1
        ])->where(function($query) {
            $query->where('expire_time', 0)
                  ->whereOr('expire_time', '>', time());
        })->where('chance_count', '>', 'used_count')->sum('chance_count - used_count');
    }

    /**
     * 获取用户总的剩余抽奖次数
     */
    public static function getUserRemainCount($user_id, $activity_id)
    {
        $list = self::where([
            'user_id' => $user_id,
            'activity_id' => $activity_id,
            'status' => 1
        ])->where(function($query) {
            $query->where('expire_time', 0)
                  ->whereOr('expire_time', '>', time());
        })->select();
        
        $total = 0;
        foreach ($list as $item) {
            $remain = $item->chance_count - $item->used_count;
            if ($remain > 0) {
                $total += $remain;
            }
        }
        
        return $total;
    }
}