<?php

namespace App\Products\Product\Transfer;

use Komma\KMS\Transfer\AbstractCsvExportService;
use Komma\KMS\Globalization\Languages\Models\Language;
use App\Discounts\Actions\ModifyPriceAction;
use App\Discounts\Conditions\QuantityDiscountCondition;
use App\Discounts\DiscountServiceInterface;
use App\Products\Product\Product;

/**
 * Class ProductCsvExportService
 *
 * Is directed by a ImportExportService and can export Product related data to a multidimensional csv array.
 * The first level keys in the array represent rows by arrays. The keys from those arrays represent columns and their values,
 * The column values.
 *
 * @package App\Products\Product
 */
class ProductCsvExportService extends AbstractCsvExportService
{
    use ProductColumnMapsTrait;

    /** @var DiscountServiceInterface $discountService */
    private $discountService;

    public function __construct()
    {
        $this->discountService = app(DiscountServiceInterface::class);
    }

    /**
     * Returns an array of arrays that represent products.
     * Each row represents an item in the form of an array. In the case of products an example could be:
     * [
     *  ['1', 'my awesome product', 'product description']
     *  ['1', 'my awesome second product', 'product description 2']
     * ]
     *
     * @return array
     */
    function export():array
    {
        $languageIso2s = ['nl', 'en', 'de']; //The order of the iso2's also determines their order in the csv. From left to right.
        $languages = Language::whereIn('iso_2', $languageIso2s)->get()->sortBy(function($language) use ($languageIso2s) {
            return array_search($language->iso_2, $languageIso2s);
        });

        $products = Product::with(['translations'])->get();

        $productsCsv = $products->map(function(Product $product) use($languages) {
            //Product fields
            $productDataCollection = collect([$product->active, $product->price, (string) $product->stock_keeping_unit]);

            //Discount
            $discountDataCollection = collect();
            $discount = $this->discountService->getQuantityDiscountForASpecificDiscountable($product);
            if($discount)
            {
                /** @var QuantityDiscountCondition $quantityDiscountCondition */
                $quantityDiscountCondition = $discount->getDiscountCondition();
                /** @var ModifyPriceAction $modifyPriceAction */
                $modifyPriceAction = $discount->getDiscountAction();

                $discountDataCollection->push($quantityDiscountCondition->getQuantity().'/'.$modifyPriceAction->getModificationValue());
            } else {
                $discountDataCollection->push('');
            }

            //Product translation fields
            $productTranslationDataCollection = $languages->map(function (Language $language) use($product) {
                $productTranslation = $product->translations->where('language_id', $language->id)->first();
                if($productTranslation) {
                    return [$productTranslation->name, $productTranslation->description, $productTranslation->meta_description];
                } else {
                    return ['', '', ''];
                }
            })->collapse();

            $row = $productDataCollection->merge($discountDataCollection)->merge($productTranslationDataCollection);

            return $row;
        })->toArray();

        return $productsCsv;
    }
}