<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\SoftDeletes;

class Department extends Model
{
    use SoftDeletes;

    protected $table = 'departments';

    protected $fillable = [
        'tenant_id',
        'parent_id',
        'code',
        'name',
        'description',
        'is_active',
        'sort_order',
        'created_by',
        'updated_by',
        'deleted_by',
    ];

    protected $casts = [
        'tenant_id' => 'integer',
        'parent_id' => 'integer',
        'is_active' => 'boolean',
        'sort_order' => 'integer',
    ];

    protected $hidden = [
        'deleted_by',
        'deleted_at',
    ];

    /**
     * 상위 부서
     */
    public function parent(): BelongsTo
    {
        return $this->belongsTo(self::class, 'parent_id');
    }

    /**
     * 하위 부서
     */
    public function children(): HasMany
    {
        return $this->hasMany(self::class, 'parent_id');
    }

    /**
     * 부서-사용자 매핑 (DepartmentUser pivot)
     */
    public function departmentUsers(): HasMany
    {
        return $this->hasMany(DepartmentUser::class, 'department_id');
    }

    /**
     * 부서에 속한 사용자들 (belongsToMany)
     */
    public function users()
    {
        return $this->belongsToMany(User::class, 'department_user')
            ->withTimestamps()
            ->withPivot(['tenant_id', 'is_primary', 'joined_at', 'left_at']);
    }
}