<?php

namespace app\model;

use Illuminate\Database\Eloquent\Model;

class ApprovalNode extends Model
{
    protected $table = 'approval_node';

    protected $fillable = [
        'flow_id',
        'type',
        'name',
        'order',
        'approvers',
        'conditions',
    ];

    protected $casts = [
        'approvers' => 'array',
        'conditions' => 'array',
        'order' => 'integer',
        'created_at' => 'datetime',
        'updated_at' => 'datetime',
    ];

    /**
     * 节点类型常量
     */
    const TYPE_APPROVER = 'approver';       // 审批人（单人）
    const TYPE_AND_APPROVE = 'and_approve'; // 会签（需所有人通过）
    const TYPE_OR_APPROVE = 'or_approve';   // 或签（任一人通过）
    const TYPE_NOTIFY = 'notify';           // 抄送（通知用）

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

    /**
     * 获取指定顺序的节点
     */
    public function scopeByOrder($query, int $order)
    {
        return $query->where('order', $order);
    }

    /**
     * 判断是否是审批节点
     */
    public function isApprovalNode(): bool
    {
        return in_array($this->type, [
            self::TYPE_APPROVER,
            self::TYPE_AND_APPROVE,
            self::TYPE_OR_APPROVE,
        ]);
    }

    /**
     * 判断是否是会签
     */
    public function isAndApprove(): bool
    {
        return $this->type === self::TYPE_AND_APPROVE;
    }

    /**
     * 判断是否是或签
     */
    public function isOrApprove(): bool
    {
        return $this->type === self::TYPE_OR_APPROVE;
    }
}