<?php

declare(strict_types=1);

namespace Domain\Models\Entities;

use Domain\Models\ValueObjects\BasketProduct;
use Domain\Models\ValueObjects\Entities\BasketId;
use Domain\Models\ValueObjects\Entities\ProductId;
use Money\Money;
use Shared\DDD\Entity;

/** @implements \Shared\DDD\Entity<\Domain\Models\ValueObjects\Entities\BasketId> */
final class Basket implements Entity
{
    /**
     * @var array<string,\Domain\Models\ValueObjects\BasketProduct>
     */
    private array $items = [];

    /**
     * @param  array<array-key,\Domain\Models\ValueObjects\BasketProduct>  $items
     */
    public function __construct(
        public readonly BasketId $id,
        array $items = []
    ) {
        foreach ($items as $item) {
            if (! $item instanceof BasketProduct) {
                throw new \DomainException('All items shall be of type BasketProduct');
            }
            $this->items[(string) $item->id->value] = $item;
        }
    }

    #[\Override]
    public function id(): BasketId
    {
        return $this->id;
    }

    public function has(ProductId $itemId): bool
    {
        return array_key_exists((string) $itemId->value, $this->items);
    }

    public function addOrUpdate(BasketProduct $item): void
    {
        if ($this->has($item->id)) {
            $existingItem = $this->items[(string) $item->id->value];
            $updatedItem  = $this->cloneWithQuantity(
                $existingItem,
                $existingItem->qty + $item->qty
            );

            $this->items[(string) $item->id->value] = $updatedItem;

            return;
        }

        $this->items[(string) $item->id->value] = $item;
    }

    public function remove(ProductId $itemId, int $qty): void
    {
        if ($qty < 1) {
            throw new \DomainException('Cannot remove quantity less than 1');
        }

        if (! $this->has($itemId)) {
            throw new \DomainException('Basket item does not exists');
        }

        $existingItem = $this->items[(string) $itemId->value];

        if ($existingItem->qty <= $qty) {
            $this->removeLine($itemId);

            return;
        }

        $updatedItem = $this->cloneWithQuantity(
            $existingItem,
            $existingItem->qty - $qty
        );

        $this->items[(string) $itemId->value] = $updatedItem;
    }

    public function removeLine(ProductId $itemId): void
    {
        if (! $this->has($itemId)) {
            throw new \DomainException('Basket item does not exists');
        }

        unset($this->items[(string) $itemId->value]);
    }

    /**
     * @return array<string,\Domain\Models\ValueObjects\BasketProduct>
     */
    public function items(): array
    {
        return $this->items;
    }

    public function totalTaxIncluded(): Money
    {
        return array_reduce(
            $this->items,
            fn (Money $total, BasketProduct $item) => $total->add($item->totalTtc()),
            Money::EUR(0)
        );
    }

    public function totalVat(): Money
    {
        return array_reduce(
            $this->items,
            fn (Money $total, BasketProduct $item) => $total->add($item->taxTotal()),
            Money::EUR(0)
        );
    }

    public function totalRaw(): Money
    {
        return array_reduce(
            $this->items,
            fn (Money $total, BasketProduct $item) => $total->add($item->subtotalHt()),
            Money::EUR(0)
        );
    }

    public function totalDiscount(): Money
    {
        return array_reduce(
            $this->items,
            fn (Money $total, BasketProduct $item) => $total->add($item->discountTotal()),
            Money::EUR(0)
        );
    }

    public function totalWeight(): int
    {
        return (int) array_sum(array_map(fn (BasketProduct $item) => $item->weightTotal(), $this->items));
    }

    public function countItems(): int
    {
        return (int) array_sum(array_map(fn (BasketProduct $item) => $item->qty, $this->items));
    }

    private function cloneWithQuantity(BasketProduct $item, int $qty): BasketProduct
    {
        return new BasketProduct(
            $item->id,
            $item->name,
            $qty,
            $item->unitPriceHt,
            $item->unitDiscount,
            $item->taxRate,
            $item->weightGrams,
            $item->brand,
            $item->incoId,
            $item->orderUnit,
            $item->slug,
            $item->picture,
            $item->description,
            $item->weightVariable,
            $item->discountRate,
            $item->priceKgTtc,
            [...$item->options]
        );
    }
}