<?php

declare(strict_types=1);

namespace MonetaPhpShop\receipt;

use InvalidArgumentException;
use MonetaPhpShop\Money;
use MonetaPhpShop\protocol\JsonNumber;

/**
 * Чек 54-ФЗ заказа: покупатель и позиции, сумма позиций равна сумме оплаты до копейки.
 * Отдаётся в двух формах: `MNT_ATTRIBUTES` XML-ответов и объект `receipt` JSON-ответа Check URL.
 */
final class Receipt
{
    /** @var ReceiptClient|null */
    private $client;

    /** @var array<int, ReceiptItem> */
    private $items;

    /**
     * @param array<int, ReceiptItem> $items
     */
    public function __construct(?ReceiptClient $client, array $items)
    {
        if ($items === []) {
            throw new InvalidArgumentException('Чек без позиций.');
        }

        $this->client = $client;
        $this->items = array_values($items);
    }

    public function getClient(): ?ReceiptClient
    {
        return $this->client;
    }

    /**
     * @return array<int, ReceiptItem>
     */
    public function getItems(): array
    {
        return $this->items;
    }

    public function total(): Money
    {
        $total = Money::fromMinorUnits(0);
        foreach ($this->items as $item) {
            $total = $total->add($item->total());
        }

        return $total;
    }

    /**
     * `MNT_ATTRIBUTES`: `INVENTORY` всегда; `CLIENT`, `CUSTOMER` (email), `PHONE` (без `+`) —
     * если есть контакт; `SNO` — при фискализации, если система налогообложения выбрана.
     * `DELIVERY` не передаётся: доставка — позицией `INVENTORY`.
     * Без фискализации позиции урезаны ({@see ReceiptItem::toInventoryPosition()}).
     *
     * @return array<string, string>
     */
    public function toAttributes(bool $fiscalization = true, ?TaxSystem $taxSystem = null): array
    {
        $attributes = [
            'INVENTORY' => JsonNumber::encode(
                array_map(static function (ReceiptItem $item) use ($fiscalization): array {
                    return $item->toInventoryPosition($fiscalization);
                }, $this->items),
            ),
        ];

        $client = ($this->client !== null) ? $this->client->toArray(ReceiptClient::KASSA_PHONE_MAX_LENGTH) : [];
        if ($client !== []) {
            $attributes['CLIENT'] = JsonNumber::encode([$client]);
            if (isset($client['email'])) {
                $attributes['CUSTOMER'] = $client['email'];
            }
            if (isset($client['phone'])) {
                $attributes['PHONE'] = ltrim($client['phone'], '+');
            }
        }

        if ($fiscalization && ($taxSystem !== null) && $taxSystem->isPassed()) {
            $attributes['SNO'] = $taxSystem->getValue();
        }

        return $attributes;
    }

    /**
     * Объект `receipt` JSON-ответа Check URL. Без контакта — пустой `client` (`{}`).
     *
     * @return array<string, mixed>
     */
    public function toJsonReceipt(): array
    {
        $client = $this->client !== null ? $this->client->toArray(ReceiptClient::JSON_PHONE_MAX_LENGTH) : [];

        return [
            'client' => $client === [] ? new \stdClass() : $client,
            'items' => array_map(static function (ReceiptItem $item): array {
                return $item->toCheckItem();
            }, $this->items),
        ];
    }
}