<?php

namespace app\common\model;

use app\common\model\StockOrders;
use app\common\model\User;
use support\Model;

class ApprovalInstances extends Model
{
    /**
     * The connection name for the model.
     *
     * @var string|null
     */
    protected $connection = 'mysql';
    
    /**
     * The table associated with the model.
     *
     * @var string
     */
    protected $table = 'approval_instances';

    /**
     * The primary key associated with the table.
     *
     * @var string
     */
    protected $primaryKey = 'id';

    /**
     * Indicates if the model should be timestamped.
     *
     * @var bool
     */
    public $timestamps = true;
    
    
    // protected $dateFormat = 'U';

    /**
     * 允许自动填充模型字段
     */
    // protected $fillable = ['id', 'flow_type', 'biz_id', 'biz_type', 'form_data', 'initiator_id', 'status', 'current_step', 'finished_at', 'deadline_at', 'created_at', 'updated_at'];

    /**
     * 不允许自动填充模型字段
     */
    protected $guarded = [];

    protected $fillable = [
        'flow_type',
        'biz_id',
        'biz_type',
        'form_data',
        'initiator_id',
        'status',
        'current_step',
        'finished_at',
        'deadline_at',
        'round'
    ];

    protected $casts = [
        'form_data' => 'array', // 自动转换 JSON 字段为数组
        'finished_at' => 'datetime',
        'deadline_at' => 'datetime',
        'created_at' => 'datetime',
        'updated_at' => 'datetime',
    ];

    
    // ====== ====== ====== 映射业务表 ====== ====== ====== 
    protected const BIZ_CLASS = [
        'stock_orders'   => \app\common\model\StockOrders::class,
        'purchase_orders' => \app\common\model\PurchaseOrders::class,
    ];

    public function getBizTypeAttribute($value)
    {
        return self::BIZ_CLASS[$value] ?? $value;
    }

    public function bizInfo()
    {
        return $this->morphTo('bizInfo', 'biz_type', 'biz_id');
    }
    // ====== ====== ====== 映射表业务 ====== ====== ====== 


    public function records()
    {
        return $this->hasMany(ApprovalRecords::class, 'instance_id', 'id');
    }

    public function flows()
    {
        return $this->belongsTo(ApprovalFlows::class, 'flow_type', 'type');
    }

    public function initiator()
    {
        return $this->belongsTo(User::class, 'initiator_id', 'id');
    }

    // public function bizInfo2()
    // {
    //     return $this->belongsTo(StockOrders::class, 'biz_id', 'id');
    // }

    /**
     * 获取当前步骤的所有审批记录（pending 状态）
     */
    public function currentStepRecords()
    {
        return $this->approvalRecords()->where('step_index', $this->current_step)->where('status', 'pending');
    }
}