<?php

namespace App\Models\Tenants;

use App\Models\Orders\Order;
use App\Traits\Auditable;
use App\Traits\BelongsToTenant;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\SoftDeletes;

class Sale extends Model
{
    use Auditable, BelongsToTenant, SoftDeletes;

    /**
     * 매출 생성 시점 상수
     */
    public const SOURCE_ORDER_CONFIRM = 'order_confirm';      // 수주확정 시

    public const SOURCE_SHIPMENT_COMPLETE = 'shipment_complete'; // 출하완료 시

    public const SOURCE_MANUAL = 'manual';                     // 수동 등록

    public const SOURCE_TYPES = [
        self::SOURCE_ORDER_CONFIRM => '수주확정',
        self::SOURCE_SHIPMENT_COMPLETE => '출하완료',
        self::SOURCE_MANUAL => '수동등록',
    ];

    protected $fillable = [
        'tenant_id',
        'order_id',
        'shipment_id',
        'sale_number',
        'sale_date',
        'client_id',
        'supply_amount',
        'tax_amount',
        'total_amount',
        'description',
        'status',
        'source_type',
        'account_code',
        'tax_invoice_issued',
        'transaction_statement_issued',
        'tax_invoice_id',
        'deposit_id',
        'created_by',
        'updated_by',
        'deleted_by',
    ];

    protected $casts = [
        'sale_date' => 'date:Y-m-d',
        'supply_amount' => 'decimal:2',
        'tax_amount' => 'decimal:2',
        'total_amount' => 'decimal:2',
        'client_id' => 'integer',
        'order_id' => 'integer',
        'shipment_id' => 'integer',
        'tax_invoice_issued' => 'boolean',
        'transaction_statement_issued' => 'boolean',
        'tax_invoice_id' => 'integer',
        'deposit_id' => 'integer',
    ];

    /**
     * 상태 목록
     */
    public const STATUSES = [
        'draft' => '임시저장',
        'confirmed' => '확정',
        'invoiced' => '세금계산서발행',
    ];

    /**
     * 수주 관계
     */
    public function order(): BelongsTo
    {
        return $this->belongsTo(Order::class);
    }

    /**
     * 출하 관계
     */
    public function shipment(): BelongsTo
    {
        return $this->belongsTo(Shipment::class);
    }

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

    /**
     * 입금 관계
     */
    public function deposit(): BelongsTo
    {
        return $this->belongsTo(Deposit::class);
    }

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

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

    /**
     * 확정 가능 여부
     */
    public function canConfirm(): bool
    {
        return $this->status === 'draft';
    }

    /**
     * 수정 가능 여부
     */
    public function canEdit(): bool
    {
        return $this->status === 'draft';
    }

    /**
     * 삭제 가능 여부
     */
    public function canDelete(): bool
    {
        return $this->status === 'draft';
    }

    /**
     * 생성 시점 라벨
     */
    public function getSourceTypeLabelAttribute(): string
    {
        return self::SOURCE_TYPES[$this->source_type] ?? $this->source_type ?? '수동등록';
    }

    /**
     * 수주에서 매출 생성
     */
    public static function createFromOrder(Order $order, string $saleNumber): self
    {
        return new self([
            'tenant_id' => $order->tenant_id,
            'order_id' => $order->id,
            'sale_number' => $saleNumber,
            'sale_date' => now()->toDateString(),
            'client_id' => $order->client_id,
            'supply_amount' => $order->supply_amount,
            'tax_amount' => $order->tax_amount,
            'total_amount' => $order->total_amount,
            'description' => "수주 {$order->order_no} 매출",
            'status' => 'draft',
            'source_type' => self::SOURCE_ORDER_CONFIRM,
            'created_by' => $order->updated_by ?? $order->created_by,
        ]);
    }

    /**
     * 출하에서 매출 생성
     */
    public static function createFromShipment(Shipment $shipment, string $saleNumber): self
    {
        return new self([
            'tenant_id' => $shipment->tenant_id,
            'order_id' => $shipment->order_id,
            'shipment_id' => $shipment->id,
            'sale_number' => $saleNumber,
            'sale_date' => $shipment->shipped_date ?? now()->toDateString(),
            'client_id' => $shipment->order?->client_id,
            'supply_amount' => $shipment->total_amount / 1.1, // 세전 역산
            'tax_amount' => $shipment->total_amount - ($shipment->total_amount / 1.1),
            'total_amount' => $shipment->total_amount,
            'description' => "출하 {$shipment->shipment_no} 매출",
            'status' => 'draft',
            'source_type' => self::SOURCE_SHIPMENT_COMPLETE,
            'created_by' => $shipment->updated_by ?? $shipment->created_by,
        ]);
    }
}