<?php

/**
 * Product Link Checker Product Data Generate Controller
 *
 * This controller generates a JSON or CSV feed of all products and their attribute combinations
 * with detailed information for external services.
 */

use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Serializer\Encoder\CsvEncoder;

class ProductLinkCheckerProductModuleFrontController extends ModuleFrontController
{
    /**
     * @see FrontController::init()
     */
    public function init()
    {
        parent::init();

        // Security check
        if (!Tools::getValue('token') || Tools::getValue('token') !== Configuration::get('PLC_SECURITY_TOKEN')) {
            $response = new JsonResponse(['error' => 'Not Authorized'], 403);
            $response->send();
            exit;
        }
    }

    /**
     * @see FrontController::initContent()
     */
    public function initContent()
    {
        parent::initContent();

        $format = Tools::getValue('format', 'json');
        $productsData = [];
        $collection = new PrestaShopCollection('Product');

        // This temporary array will help flatten attributes for CSV
        $attributes_list = [];

        foreach ((array)Tools::getValue('plc_id_shop', Shop::getShops(true, null, true)) as $id_shop) {
            foreach ((array)Tools::getValue('plc_id_lang', Language::getLanguages(false, false, true)) as $id_lang) {
                foreach ($collection as $p) {
                    $product = new Product((int)$p->id, false, $id_lang, $id_shop);

                    if (!Validate::isLoadedObject($product)) {
                        continue;
                    }
                    if (Tools::getValue('plc_only_active') && !$product->active) {
                        continue;
                    }

                    // Handle products with attribute combinations
                    if ($product->hasAttributes()) {
                        $combinations = $product->getAttributeCombinations($id_lang);
                        foreach ($combinations as $combination) {
                            $index = $product->id . '_' . $combination['id_product_attribute'];
                            if (!isset($productsData[$index])) {
                                $productsData[$index] = $this->getBaseProductData($product, $id_lang, $id_shop, (int)$combination['id_product_attribute']);
                            }
                            // Store attributes for later processing (both JSON and CSV)
                            $attributes_list[$index][] = [
                                'group_name' => $combination['group_name'] ?? null,
                                'attribute_name' => $combination['attribute_name'] ?? null,
                            ];
                        }
                    } else { // Handle simple products (without combinations)
                        $index = $product->id . '_' . 0;
                        $productsData[$index] = $this->getBaseProductData($product, $id_lang, $id_shop, 0);
                    }
                }
            }
        }

        // Post-process the data based on the requested format
        foreach ($productsData as $index => &$data) {
            if (isset($attributes_list[$index])) {
                if ($format === 'csv') {
                    // Flatten attributes into a single string for CSV
                    $flat_attributes = [];
                    foreach ($attributes_list[$index] as $attr) {
                        $flat_attributes[] = $attr['group_name'] . ':' . $attr['attribute_name'];
                    }
                    $data['attributes'] = implode(' | ', $flat_attributes);
                } else {
                    // Keep the structured array for JSON
                    $data['attributes'] = $attributes_list[$index];
                }
            } elseif ($format === 'csv') {
                 // Ensure the attributes column exists for simple products in CSV
                 $data['attributes'] = '';
            }
        }
        unset($data);


        if ($format === 'csv') {
            $this->sendCsvResponse(array_values($productsData), 'products.csv');
        } else {
            $response = new JsonResponse($productsData);
            $response->send();
            exit;
        }
    }
    
    /**
     * Helper to get common product data fields.
     */
    private function getBaseProductData(Product $product, $id_lang, $id_shop, $id_product_attribute)
    {
        $combination = new Combination($id_product_attribute);
        $data = [
            'id_lang' => (int)$id_lang,
            'id_shop' => (int)$id_shop,
            'id_product' => (int)$product->id,
            'id_product_attribute' => $id_product_attribute,
            'active' => (bool)$product->active,
            'link' => $this->context->link->getProductLink($product, null, null, null, (int)$id_lang, (int)$id_shop, $id_product_attribute, false),
        ];

        // Conditionally add data based on URL flags
        Tools::getValue('plc_name') ? $data['name'] = $product->name : null;
        Tools::getValue('plc_link_rewrite') ? $data['link_rewrite'] = $product->link_rewrite : null;
        Tools::getValue('plc_description') ? $data['description'] = $product->description : null;
        Tools::getValue('plc_description_short') ? $data['description_short'] = $product->description_short : null;
        Tools::getValue('plc_meta_title') ? $data['meta_title'] = $product->meta_title : null;
        Tools::getValue('plc_meta_description') ? $data['meta_description'] = $product->meta_description : null;

        // Use combination specific data if it exists, otherwise fallback to product
        Tools::getValue('plc_reference') ? $data['reference'] = ($id_product_attribute && !empty($combination->reference)) ? $combination->reference : $product->reference : null;
        Tools::getValue('plc_ean13') ? $data['ean13'] = ($id_product_attribute && !empty($combination->ean13)) ? $combination->ean13 : $product->ean13 : null;
        Tools::getValue('plc_upc') ? $data['upc'] = ($id_product_attribute && !empty($combination->upc)) ? $combination->upc : $product->upc : null;
        Tools::getValue('plc_mpn') ? $data['mpn'] = ($id_product_attribute && !empty($combination->mpn)) ? $combination->mpn : $product->mpn : null;

        return $data;
    }

    /**
     * Encodes data as CSV and sends it as a downloadable file.
     */
    private function sendCsvResponse(array $data, $filename)
    {
        if (empty($data)) {
            $response = new Response('', 204); // No Content
            $response->send();
            exit;
        }

        $csvEncoder = new CsvEncoder();
        $csvContent = $csvEncoder->encode($data, 'csv', [
            CsvEncoder::DELIMITER_KEY => ';', // Semicolon for better Excel compatibility
        ]);

        $response = new Response($csvContent);
        $response->headers->set('Content-Type', 'text/csv');
        $response->headers->set('Content-Disposition', 'attachment; filename="' . $filename . '"');
        $response->send();
        exit;
    }
}