<?php
class ProductMapper {

    /**
     * Build a Reverb listing payload from an OpenCart product array.
     *
     * @param array $product     Row from oc_product joined with oc_product_description.
     * @param array $reverb_data Row from oc_reverb_product_map (condition_uuid, reverb_category_uuid).
     * @param array $settings    Global Reverb settings (currency, shipping_domestic, shipping_international, store_image_url).
     * @return array             Ready to POST/PUT to /listings.
     */
    public static function toReverb(array $product, array $reverb_data, array $settings) {
        $currency = !empty($settings['currency']) ? $settings['currency'] : 'AUD';

        // Convert HTML description to clean plain text
        $desc = $product['description'];
        $desc = preg_replace('/<br\s*\/?>/i', "\n", $desc);
        $desc = preg_replace('/<\/p>/i', "\n\n", $desc);
        $desc = strip_tags($desc);
        $desc = html_entity_decode($desc, ENT_QUOTES | ENT_HTML5, 'UTF-8');
        $desc = trim(preg_replace('/\n{3,}/', "\n\n", $desc));

        $payload = [
            'title'         => html_entity_decode($product['name'], ENT_QUOTES | ENT_HTML5, 'UTF-8'),
            'description'   => $desc,
            'sku'           => $product['model'],
            'inventory'     => max(0, (int)$product['quantity']),
            'has_inventory' => true,
            'handmade'      => !empty($reverb_data['handmade']),
            'upc_does_not_apply' => !isset($reverb_data['upc_does_not_apply']) || (bool)$reverb_data['upc_does_not_apply'],
            'price'         => [
                'amount'   => number_format((float)$product['price'], 2, '.', ''),
                'currency' => $currency,
            ],
        ];

        if (!empty($product['manufacturer'])) {
            $payload['make'] = $product['manufacturer'];
        }

        if (!empty($reverb_data['condition_uuid'])) {
            $payload['condition'] = ['uuid' => $reverb_data['condition_uuid']];
        }

        if (!empty($reverb_data['reverb_category_uuid'])) {
            $payload['categories'] = [['uuid' => $reverb_data['reverb_category_uuid']]];
        }

        if (!empty($reverb_data['origin_country_code'])) {
            $payload['origin_country_code'] = strtoupper($reverb_data['origin_country_code']);
        }

        // Shipping rates
        $rates = [];
        if (!empty($settings['shipping_domestic'])) {
            $rates[] = [
                'region_code' => 'AU',
                'rate'        => [
                    'amount'   => number_format((float)$settings['shipping_domestic'], 2, '.', ''),
                    'currency' => $currency,
                ],
            ];
        }
        if (!empty($settings['shipping_international'])) {
            $rates[] = [
                'region_code' => 'XX',
                'rate'        => [
                    'amount'   => number_format((float)$settings['shipping_international'], 2, '.', ''),
                    'currency' => $currency,
                ],
            ];
        }
        if ($rates) {
            $payload['shipping'] = ['rates' => $rates];
        }

        return $payload;
    }

    /**
     * Extract updatable OC product fields from a Reverb listing payload
     * (used for Reverb → OpenCart sync).
     *
     * @param array $listing  A listing object from the Reverb API.
     * @return array          Partial product data to merge into OC.
     */
    public static function fromReverb(array $listing) {
        $data = [];

        if (isset($listing['title'])) {
            $data['name'] = $listing['title'];
        }
        if (isset($listing['description'])) {
            $data['description'] = $listing['description'];
        }
        if (isset($listing['price']['amount'])) {
            $data['price'] = (float)$listing['price']['amount'];
        }
        if (isset($listing['inventory'])) {
            $data['quantity'] = (int)$listing['inventory'];
        }

        return $data;
    }

    /**
     * Build photo upload payloads for a product's images.
     *
     * @param array  $images      Array of image paths relative to OC image dir.
     * @param string $store_url   Full base URL of the store (e.g. https://example.com/).
     * @return array              Array of ['image_url' => '...'] payloads.
     */
    public static function buildPhotoPayloads(array $images, $store_url) {
        $payloads = [];
        $base = rtrim($store_url, '/') . '/image/';
        foreach ($images as $path) {
            if (!empty($path)) {
                $payloads[] = ['image_url' => $base . ltrim($path, '/')];
            }
        }
        return $payloads;
    }
}