<?php

namespace App\Models\Orders;

use App\Models\Items\Item;
use App\Models\Quote\Quote;
use App\Models\Quote\QuoteItem;
use App\Traits\Auditable;
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;

/**
 * 수주 상세 (Order Items)
 *
 * @mixin IdeHelperOrderItem
 */
class OrderItem extends Model
{
    use Auditable, BelongsToTenant, SoftDeletes;

    protected $table = 'order_items';

    protected $fillable = [
        'tenant_id',
        'order_id',
        'quote_id',
        'quote_item_id',
        'serial_no',
        // 품목 정보
        'item_id',
        'item_code',
        'item_name',
        'specification',
        // 제품-부품 매핑용 코드
        'floor_code',
        'symbol_code',
        'unit',
        // 수량/금액
        'quantity',
        'unit_price',
        'supply_amount',
        'tax_amount',
        'total_amount',
        // 할인
        'discount_rate',
        'discount_amount',
        // 기타
        'status_code',
        'design_code',
        'remarks',
        'note',
        'sort_order',
        'attributes',
        // 감사
        'created_by',
        'updated_by',
        'deleted_by',
    ];

    protected $casts = [
        'quantity' => 'decimal:4',
        'unit_price' => 'decimal:2',
        'supply_amount' => 'decimal:2',
        'tax_amount' => 'decimal:2',
        'total_amount' => 'decimal:2',
        'discount_rate' => 'decimal:2',
        'discount_amount' => 'decimal:2',
        'attributes' => 'array',
        'created_at' => 'datetime',
        'updated_at' => 'datetime',
        'deleted_at' => 'datetime',
    ];

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

    /**
     * 품목 마스터
     */
    public function item(): BelongsTo
    {
        return $this->belongsTo(Item::class, 'item_id');
    }

    /**
     * 원본 견적
     */
    public function quote(): BelongsTo
    {
        return $this->belongsTo(Quote::class);
    }

    /**
     * 원본 견적 품목
     */
    public function quoteItem(): BelongsTo
    {
        return $this->belongsTo(QuoteItem::class);
    }

    /**
     * 투입 구성 (자재/BOM 등)
     */
    public function components(): HasMany
    {
        return $this->hasMany(OrderItemComponent::class);
    }

    /**
     * 공급가액 계산 (수량 × 단가 - 할인)
     */
    public function calculateSupplyAmount(): float
    {
        $gross = $this->quantity * $this->unit_price;
        $discount = $this->discount_amount ?: ($gross * ($this->discount_rate / 100));

        return round($gross - $discount, 2);
    }

    /**
     * 세액 계산 (공급가액 × 10%)
     */
    public function calculateTaxAmount(): float
    {
        return round($this->supply_amount * 0.1, 2);
    }

    /**
     * 총액 계산 (공급가액 + 세액)
     */
    public function calculateTotalAmount(): float
    {
        return round($this->supply_amount + $this->tax_amount, 2);
    }

    /**
     * 금액 재계산 및 저장
     */
    public function recalculateAmounts(): self
    {
        $this->supply_amount = $this->calculateSupplyAmount();
        $this->tax_amount = $this->calculateTaxAmount();
        $this->total_amount = $this->calculateTotalAmount();

        return $this;
    }

    /**
     * 견적 품목에서 수주 품목 생성
     *
     * @param  int  $serialIndex  품목 순번 (1부터 시작)
     * @param  array  $productMapping  제품 매핑 정보 ['floor_code' => '10', 'symbol_code' => 'F1']
     */
    public static function createFromQuoteItem(QuoteItem $quoteItem, int $orderId, int $serialIndex = 1, array $productMapping = []): self
    {
        $qty = $quoteItem->calculated_quantity ?? 1;
        $supplyAmount = $quoteItem->unit_price * $qty;
        $taxAmount = round($supplyAmount * 0.1, 2);

        return new self([
            'tenant_id' => $quoteItem->tenant_id,
            'order_id' => $orderId,
            'quote_id' => $quoteItem->quote_id,
            'quote_item_id' => $quoteItem->id,
            'serial_no' => str_pad($serialIndex, 3, '0', STR_PAD_LEFT),
            'item_id' => $quoteItem->item_id,
            'item_code' => $quoteItem->item_code,
            'item_name' => $quoteItem->item_name,
            'specification' => $quoteItem->specification,
            // 제품-부품 매핑 코드
            'floor_code' => $productMapping['floor_code'] ?? null,
            'symbol_code' => $productMapping['symbol_code'] ?? null,
            'unit' => $quoteItem->unit ?? 'EA',
            'quantity' => $qty,
            'unit_price' => $quoteItem->unit_price,
            'supply_amount' => $supplyAmount,
            'tax_amount' => $taxAmount,
            'total_amount' => $supplyAmount + $taxAmount,
            'note' => $quoteItem->note,
            'sort_order' => $quoteItem->sort_order ?? 0,
        ]);
    }
}