<?php

namespace App\Models\Tenants;

use App\Models\Members\User;
use App\Traits\Auditable;
use App\Traits\BelongsToTenant;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\SoftDeletes;

/**
 * 결재선 템플릿 모델
 *
 * @property int $id
 * @property int $tenant_id
 * @property string $name
 * @property array $steps
 * @property bool $is_default
 * @property int|null $created_by
 * @property int|null $updated_by
 * @property int|null $deleted_by
 */
class ApprovalLine extends Model
{
    use Auditable, BelongsToTenant, SoftDeletes;

    protected $table = 'approval_lines';

    protected $casts = [
        'steps' => 'array',
        'is_default' => 'boolean',
    ];

    protected $fillable = [
        'tenant_id',
        'name',
        'steps',
        'is_default',
        'created_by',
        'updated_by',
        'deleted_by',
    ];

    protected $attributes = [
        'is_default' => false,
    ];

    // =========================================================================
    // 단계 유형 상수
    // =========================================================================

    public const STEP_TYPE_APPROVAL = 'approval';       // 결재

    public const STEP_TYPE_AGREEMENT = 'agreement';     // 합의

    public const STEP_TYPE_REFERENCE = 'reference';     // 참조

    public const STEP_TYPES = [
        self::STEP_TYPE_APPROVAL,
        self::STEP_TYPE_AGREEMENT,
        self::STEP_TYPE_REFERENCE,
    ];

    // =========================================================================
    // 관계 정의
    // =========================================================================

    /**
     * 생성자
     */
    public function creator(): BelongsTo
    {
        return $this->belongsTo(User::class, 'created_by');
    }

    /**
     * 수정자
     */
    public function updater(): BelongsTo
    {
        return $this->belongsTo(User::class, 'updated_by');
    }

    // =========================================================================
    // 스코프
    // =========================================================================

    /**
     * 기본 결재선만
     */
    public function scopeDefault($query)
    {
        return $query->where('is_default', true);
    }

    // =========================================================================
    // 헬퍼 메서드
    // =========================================================================

    /**
     * 결재선 단계 수
     */
    public function getStepCountAttribute(): int
    {
        return count($this->steps ?? []);
    }

    /**
     * 결재자 목록 (user_id만)
     */
    public function getApproverIdsAttribute(): array
    {
        return collect($this->steps ?? [])
            ->pluck('user_id')
            ->filter()
            ->values()
            ->toArray();
    }
}
