<?php

namespace app\model;

use support\Model;

class ApprovalOrder extends Model
{
    protected $table = 'approval_order';

    protected $fillable = [
        'business_type',
        'business_id',
        'title',
        'applicant_id',
        'status',
        'current_nodes',
        'flow_id',
        'form_data',
        'attachments',
    ];

    protected $casts = [
        'current_nodes' => 'array',
        'form_data' => 'array',
        'attachments' => 'array',
        'created_at' => 'datetime',
        'updated_at' => 'datetime',
    ];

    /**
     * 审批状态常量
     */
    const STATUS_DRAFT = 'draft';         // 草稿
    const STATUS_PENDING = 'pending';     // 审批中
    const STATUS_APPROVED = 'approved';   // 已通过
    const STATUS_REJECTED = 'rejected';   // 已拒绝
    const STATUS_CANCELLED = 'cancelled'; // 已撤销

    /**
     * 关联流程
     */
    public function flow()
    {
        return $this->belongsTo(ApprovalFlow::class, 'flow_id');
    }

    /**
     * 关联申请人
     */
    public function applicant()
    {
        return $this->belongsTo(User::class, 'applicant_id');
    }

    /**
     * 关联审批记录
     */
    public function records()
    {
        return $this->hasMany(ApprovalRecord::class, 'order_id')->orderBy('created_at');
    }

    /**
     * 判断是否可以编辑
     */
    public function canEdit(): bool
    {
        return $this->status === self::STATUS_DRAFT;
    }

    /**
     * 判断是否可以审批
     */
    public function canApprove(): bool
    {
        return $this->status === self::STATUS_PENDING;
    }

    /**
     * 判断是否已结束
     */
    public function isEnded(): bool
    {
        return in_array($this->status, [
            self::STATUS_APPROVED,
            self::STATUS_REJECTED,
            self::STATUS_CANCELLED,
        ]);
    }
}