<?php
declare(strict_types=1);

namespace SixShop\Message\Entity;

use think\Model;

/**
 * 私信实体类
 */
class PrivateMessageEntity extends Model
{
    // 设置表名
    protected $name = 'message_privates';
    
    // 设置字段信息
    protected $schema = [
        'id'           => 'int',
        'from_user_id' => 'int',
        'to_user_id'   => 'int',
        'content'      => 'string',
        'is_read'      => 'int',
        'read_time'    => 'int',
        'create_time'  => 'int',
        'update_time'  => 'int',
        'delete_time'  => 'int',
    ];
    
    // 自动时间戳
    protected $autoWriteTimestamp = true;
    
    // 软删除
    protected $deleteTime = 'delete_time';
    
    /**
     * 获取是否已读文本
     */
    public function getIsReadTextAttr()
    {
        $statuses = [
            0 => '未读',
            1 => '已读',
        ];
        
        return $statuses[$this->is_read] ?? '未知状态';
    }
    
    /**
     * 标记为已读
     */
    public function markAsRead()
    {
        if ($this->is_read == 0) {
            $this->is_read = 1;
            $this->read_time = time();
            $this->save();
        }
        
        return $this;
    }
    
    /**
     * 关联发送者用户
     */
    public function fromUser()
    {
        return $this->belongsTo('app\common\model\User', 'from_user_id');
    }
    
    /**
     * 关联接收者用户
     */
    public function toUser()
    {
        return $this->belongsTo('app\common\model\User', 'to_user_id');
    }
    
    /**
     * 判断是否为系统消息
     */
    public function isSystemMessage()
    {
        return $this->from_user_id == 0;
    }
}