<?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;

/**
 * 휴가 잔여일수 모델
 *
 * @property int $id
 * @property int $tenant_id
 * @property int $user_id
 * @property int $year
 * @property float $total_days
 * @property float $used_days
 * @property float $remaining_days
 */
class LeaveBalance extends Model
{
    use Auditable, BelongsToTenant;

    protected $table = 'leave_balances';

    protected $casts = [
        'year' => 'integer',
        'total_days' => 'decimal:1',
        'used_days' => 'decimal:1',
        'remaining_days' => 'decimal:1',
    ];

    protected $fillable = [
        'tenant_id',
        'user_id',
        'year',
        'total_days',
        'used_days',
    ];

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

    /**
     * 사용자
     */
    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class, 'user_id');
    }

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

    /**
     * 특정 연도
     */
    public function scopeForYear($query, int $year)
    {
        return $query->where('year', $year);
    }

    /**
     * 특정 사용자
     */
    public function scopeForUser($query, int $userId)
    {
        return $query->where('user_id', $userId);
    }

    /**
     * 현재 연도
     */
    public function scopeCurrentYear($query)
    {
        return $query->where('year', now()->year);
    }

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

    /**
     * 휴가 사용
     */
    public function useLeave(float $days): void
    {
        $this->used_days += $days;
        $this->save();
    }

    /**
     * 휴가 복원 (취소 시)
     */
    public function restoreLeave(float $days): void
    {
        $this->used_days = max(0, $this->used_days - $days);
        $this->save();
    }

    /**
     * 사용 가능 여부
     */
    public function canUse(float $days): bool
    {
        return $this->remaining_days >= $days;
    }
}