<?php

namespace App\Data;

use App\Contracts\OutputDataTransferObject;
use App\Models\Cart;

final readonly class CartDTO implements OutputDataTransferObject
{
    /**
     * @param  CartItemDTO[]  $items
     */
    public function __construct(
        public int $id,
        public ?int $itemsCount = null,
        public ?int $totalPrice = null,
        public array $items = []
    ) {}

    /**
     * @return array<string, mixed>
     */
    public function toArray(): array
    {
        return [
            'id' => $this->id,
            'itemsCount' => $this->itemsCount,
            'totalPrice' => $this->totalPrice,
            'items' => $this->items,
        ];
    }

    public static function fromModel(Cart $cart)
    {
        return new self(
            id: $cart->id,
            itemsCount: $cart->products->count(),
            totalPrice: $cart->products->sum(fn ($product) => $product->pivot->price * $product->pivot->quantity),
            items: $cart->products->map(fn ($product) => new CartItemDTO(
                id: $product->id,
                title: $product->title,
                quantity: $product->pivot->quantity,
                price: $product->actual_price,
                subtotal: $product->actual_price * $product->pivot->quantity,
                image: $product->images->first()->path,
            ))->toArray()
        );
    }
}