<?php

namespace App\Models\Tenants;

use App\Traits\BelongsToTenant;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\SoftDeletes;

class Shipment extends Model
{
    use BelongsToTenant, SoftDeletes;

    protected $fillable = [
        'tenant_id',
        'shipment_no',
        'lot_no',
        'order_id',
        'scheduled_date',
        'status',
        'priority',
        'delivery_method',
        // 발주처/배송 정보
        'client_id',
        'customer_name',
        'site_name',
        'delivery_address',
        'receiver',
        'receiver_contact',
        // 상태 플래그
        'can_ship',
        'deposit_confirmed',
        'invoice_issued',
        'customer_grade',
        // 상차 정보
        'loading_manager',
        'loading_completed_at',
        'loading_time',
        // 물류/배차 정보
        'logistics_company',
        'vehicle_tonnage',
        'shipping_cost',
        // 차량/운전자 정보
        'vehicle_no',
        'driver_name',
        'driver_contact',
        'expected_arrival',
        'confirmed_arrival',
        // 기타
        'remarks',
        'created_by',
        'updated_by',
        'deleted_by',
    ];

    protected $casts = [
        'scheduled_date' => 'date',
        'can_ship' => 'boolean',
        'deposit_confirmed' => 'boolean',
        'invoice_issued' => 'boolean',
        'loading_completed_at' => 'datetime',
        'loading_time' => 'datetime',
        'expected_arrival' => 'datetime',
        'confirmed_arrival' => 'datetime',
        'shipping_cost' => 'decimal:0',
        'order_id' => 'integer',
        'client_id' => 'integer',
    ];

    /**
     * 출하 상태 목록
     */
    public const STATUSES = [
        'scheduled' => '출고예정',
        'ready' => '출하대기',
        'shipping' => '배송중',
        'completed' => '배송완료',
    ];

    /**
     * 우선순위 목록
     */
    public const PRIORITIES = [
        'urgent' => '긴급',
        'normal' => '보통',
        'low' => '낮음',
    ];

    /**
     * 배송방식 목록
     */
    public const DELIVERY_METHODS = [
        'pickup' => '상차',
        'direct' => '직접배차',
        'logistics' => '물류사',
    ];

    /**
     * 출하 품목 관계
     */
    public function items(): HasMany
    {
        return $this->hasMany(ShipmentItem::class)->orderBy('seq');
    }

    /**
     * 거래처 관계
     */
    public function client(): BelongsTo
    {
        return $this->belongsTo(\App\Models\Clients\Client::class);
    }

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

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

    /**
     * 상태 라벨
     */
    public function getStatusLabelAttribute(): string
    {
        return self::STATUSES[$this->status] ?? $this->status;
    }

    /**
     * 우선순위 라벨
     */
    public function getPriorityLabelAttribute(): string
    {
        return self::PRIORITIES[$this->priority] ?? $this->priority;
    }

    /**
     * 배송방식 라벨
     */
    public function getDeliveryMethodLabelAttribute(): string
    {
        return self::DELIVERY_METHODS[$this->delivery_method] ?? $this->delivery_method;
    }

    /**
     * 총 품목 수량
     */
    public function getTotalQuantityAttribute(): float
    {
        return $this->items->sum('quantity');
    }

    /**
     * 품목 수
     */
    public function getItemCountAttribute(): int
    {
        return $this->items->count();
    }

    /**
     * 긴급 여부
     */
    public function getIsUrgentAttribute(): bool
    {
        return $this->priority === 'urgent';
    }

    /**
     * 출하 가능 여부 확인
     */
    public function canProceedToShip(): bool
    {
        return $this->can_ship && $this->deposit_confirmed;
    }

    /**
     * 새 출하번호 생성
     */
    public static function generateShipmentNo(int $tenantId): string
    {
        $today = now()->format('Ymd');
        $prefix = 'SHP-'.$today.'-';

        $lastShipment = static::withoutGlobalScopes()
            ->where('tenant_id', $tenantId)
            ->where('shipment_no', 'like', $prefix.'%')
            ->orderByDesc('shipment_no')
            ->first();

        if ($lastShipment) {
            $lastSeq = (int) substr($lastShipment->shipment_no, -4);
            $newSeq = str_pad($lastSeq + 1, 4, '0', STR_PAD_LEFT);
        } else {
            $newSeq = '0001';
        }

        return $prefix.$newSeq;
    }
}