<?php
class ControllerExtensionModuleReverb extends Controller {

    private $error = [];

    // -------------------------------------------------------------------------
    // Main settings page
    // -------------------------------------------------------------------------

    public function index() {
        $this->load->language('extension/module/reverb');
        $this->load->model('extension/module/reverb');
        $this->load->model('setting/setting');
        $this->load->model('catalog/category');

        $this->document->setTitle($this->language->get('heading_title'));

        if ($this->request->server['REQUEST_METHOD'] === 'POST' && $this->validate()) {
            $this->model_setting_setting->editSetting('module_reverb', $this->request->post);
            // Save category mappings separately (they come as a sub-array)
            if (isset($this->request->post['module_reverb_category_mappings'])) {
                $this->model_extension_module_reverb->saveCategoryMappings(
                    $this->request->post['module_reverb_category_mappings']
                );
            }
            $this->session->data['success'] = $this->language->get('text_success');
            $this->response->redirect($this->url->link('extension/module/reverb', 'user_token=' . $this->session->data['user_token'], true));
        }

        $data = $this->buildBreadcrumbs();

        // Language strings required by the view
        $lang_keys = [
            'tab_settings', 'tab_categories', 'tab_log',
            'text_api_settings', 'text_shipping_settings', 'text_sync_settings', 'text_manual_sync',
            'entry_api_token', 'help_api_token',
            'entry_status', 'entry_sync_direction',
            'text_sync_push', 'text_sync_both',
            'entry_shipping_domestic', 'help_shipping_domestic',
            'entry_shipping_international', 'help_shipping_international',
            'help_sync_categories', 'button_sync_now',
            'text_order_import', 'button_import_orders',
            'entry_order_stores', 'help_order_stores', 'text_select_all', 'text_unselect_all',
            'entry_default_qty', 'help_default_qty',
            'text_category_mapping_help', 'text_no_categories',
            'column_oc_category', 'column_reverb_category',
            'column_date', 'column_product', 'column_direction', 'column_status', 'column_message',
            'text_push', 'text_pull', 'text_error', 'text_no_log', 'button_clear_log',
            'text_success', 'text_log_success',
            'error_warning', 'error_api_token',
        ];
        foreach ($lang_keys as $key) {
            $data[$key] = $this->language->get($key);
        }
        // Global OC strings
        $data['text_enabled']  = $this->language->get('text_enabled');
        $data['text_disabled'] = $this->language->get('text_disabled');
        $data['button_save']   = $this->language->get('button_save');
        $data['button_cancel'] = $this->language->get('button_cancel');

        // Pull saved settings into $data
        $fields = [
            'module_reverb_api_token',
            'module_reverb_status',
            'module_reverb_sync_direction',
            'module_reverb_sync_categories',
            'module_reverb_shipping_domestic',
            'module_reverb_shipping_international',
            'module_reverb_order_stores',
            'module_reverb_default_qty',
        ];
        foreach ($fields as $key) {
            $data[$key] = $this->request->post[$key] ?? $this->config->get($key);
        }

        // Defaults
        $data['module_reverb_sync_direction']      = $data['module_reverb_sync_direction'] ?? 'push';
        $data['module_reverb_sync_categories']     = $data['module_reverb_sync_categories'] ?? [];
        $data['module_reverb_shipping_domestic']   = $data['module_reverb_shipping_domestic'] ?? '0.00';
        $data['module_reverb_shipping_international'] = $data['module_reverb_shipping_international'] ?? '0.00';
        $data['module_reverb_order_stores']        = $data['module_reverb_order_stores'] ?? [0];
        $data['module_reverb_default_qty']         = $data['module_reverb_default_qty'] ?? 1;

        // Stores list for the checkbox UI
        $this->load->model('setting/store');
        $stores = $this->model_setting_store->getStores();
        array_unshift($stores, ['store_id' => 0, 'name' => 'Default']);
        $data['stores'] = $stores;

        // All OC categories for the multi-select
        $data['categories'] = $this->getCategoryTree();

        // Category mappings for the mapping tab
        $data['category_mappings']             = $this->model_extension_module_reverb->getCategoryMappings();
        $data['reverb_categories']             = $this->model_extension_module_reverb->getReverbCategories();
        $data['reverb_categories_grouped']     = $this->model_extension_module_reverb->getReverbCategoriesGrouped();
        $data['module_reverb_category_mappings'] = $data['category_mappings'];

        // Sync log
        $data['sync_log'] = $this->model_extension_module_reverb->getSyncLog(200);

        // Alerts
        $data['error_warning'] = $this->error['warning'] ?? '';
        $data['success']       = $this->session->data['success'] ?? '';
        unset($this->session->data['success']);

        $data['action']          = $this->url->link('extension/module/reverb', 'user_token=' . $this->session->data['user_token'], true);
        $data['cancel']          = $this->url->link('marketplace/extension', 'user_token=' . $this->session->data['user_token'] . '&type=module', true);
        $data['sync_url']        = $this->url->link('extension/module/reverb/sync', 'user_token=' . $this->session->data['user_token'], true);
        $data['import_url']      = $this->url->link('extension/module/reverb/importOrders', 'user_token=' . $this->session->data['user_token'], true);
        $data['clear_log_url']   = $this->url->link('extension/module/reverb/clearLog', 'user_token=' . $this->session->data['user_token'], true);
        $data['categories_url']  = $this->url->link('extension/module/reverb/reverbCategories', 'user_token=' . $this->session->data['user_token'], true);

        $data['header']      = $this->load->controller('common/header');
        $data['column_left'] = $this->load->controller('common/column_left');
        $data['footer']      = $this->load->controller('common/footer');

        $this->response->setOutput($this->load->view('extension/module/reverb', $data));
    }

    // -------------------------------------------------------------------------
    // Install / Uninstall
    // -------------------------------------------------------------------------

    public function install() {
        $this->load->model('extension/module/reverb');
        $this->model_extension_module_reverb->install();

        // Register events for order pulling (admin side)
        $this->load->model('setting/event');
        $this->model_setting_event->addEvent(
            'reverb',
            'admin/model/catalog/product/editProduct/after',
            'extension/module/reverb/eventProductSave'
        );
        $this->model_setting_event->addEvent(
            'reverb',
            'admin/model/catalog/product/addProduct/after',
            'extension/module/reverb/eventProductAddSave'
        );
    }

    public function uninstall() {
        $this->load->model('extension/module/reverb');
        $this->model_extension_module_reverb->uninstall();

        $this->load->model('setting/event');
        $this->model_setting_event->deleteEventByCode('reverb');
    }

    // -------------------------------------------------------------------------
    // Event handlers (called by OC event system on product save)
    // -------------------------------------------------------------------------

    public function eventProductSave(&$route, &$args, &$output) {
        $product_id = (int)$args[0];
        $this->saveProductReverb($product_id);
    }

    public function eventProductAddSave(&$route, &$args, &$output) {
        // $output holds the new product_id for addProduct
        $product_id = (int)$output;
        if ($product_id) {
            $this->saveProductReverb($product_id);
        }
    }

    private function saveProductReverb($product_id) {
        if (!isset($this->request->post['reverb_sync_enabled'])) {
            return;
        }
        $this->load->model('extension/module/reverb');
        $this->model_extension_module_reverb->saveProductMap($product_id, [
            'sync_enabled'         => (int)(bool)$this->request->post['reverb_sync_enabled'],
            'condition_uuid'       => $this->request->post['reverb_condition_uuid'] ?? '',
            'reverb_category_uuid' => $this->request->post['reverb_category_uuid'] ?? '',
            'handmade'             => (int)(bool)($this->request->post['reverb_handmade'] ?? 0),
            'upc_does_not_apply'   => (int)(bool)($this->request->post['reverb_upc_does_not_apply'] ?? 1),
        ]);
    }

    // -------------------------------------------------------------------------
    // Manual sync (AJAX)
    // -------------------------------------------------------------------------

    public function sync() {
        $this->load->language('extension/module/reverb');
        $this->load->model('extension/module/reverb');

        // Set JSON header first so any uncaught error still returns parseable JSON.
        $this->response->addHeader('Content-Type: application/json');

        // Discard any PHP notices/warnings buffered before this point so they
        // cannot corrupt the JSON response body.
        if (ob_get_level()) {
            ob_clean();
        }

        try {
            if (!$this->user->hasPermission('modify', 'extension/module/reverb')) {
                $this->response->setOutput(json_encode(['success' => false, 'error' => $this->language->get('error_permission')]));
                return;
            }

            $settings = $this->buildSettings();

            if (empty($settings['api_token'])) {
                $this->response->setOutput(json_encode(['success' => false, 'error' => $this->language->get('error_api_token')]));
                return;
            }

            $allowed_categories = $this->config->get('module_reverb_sync_categories');
            if (empty($allowed_categories)) {
                $this->response->setOutput(json_encode(['success' => false, 'error' => 'No sync categories configured. Select at least one category in the Settings tab.']));
                return;
            }

            $products = $this->model_extension_module_reverb->getSyncEnabledProducts((array)$allowed_categories);

            $pushed = 0;
            $errors = 0;

            foreach ($products as $product) {
                try {
                    $this->model_extension_module_reverb->syncProductToReverb($product, $product, $settings);
                    $pushed++;
                    $this->safeLog($product['product_id'], 'push', 'success', 'Synced: ' . $product['name']);
                } catch (Exception $e) {
                    $errors++;
                    $this->safeLog($product['product_id'], 'push', 'error', $e->getMessage());
                }
            }

            $this->response->setOutput(json_encode([
                'success' => true,
                'message' => sprintf($this->language->get('text_sync_complete'), $pushed, $errors),
            ]));

        } catch (Exception $e) {
            $this->response->setOutput(json_encode(['success' => false, 'error' => $e->getMessage()]));
        }
    }

    // -------------------------------------------------------------------------
    // Order import (AJAX)
    // -------------------------------------------------------------------------

    public function importOrders() {
        $this->load->language('extension/module/reverb');
        $this->load->model('extension/module/reverb');

        $this->response->addHeader('Content-Type: application/json');

        if (ob_get_level()) {
            ob_clean();
        }

        try {
            if (!$this->user->hasPermission('modify', 'extension/module/reverb')) {
                $this->response->setOutput(json_encode(['success' => false, 'error' => $this->language->get('error_permission')]));
                return;
            }

            $settings = $this->buildSettings();

            if (empty($settings['api_token'])) {
                $this->response->setOutput(json_encode(['success' => false, 'error' => $this->language->get('error_api_token')]));
                return;
            }

            $result = $this->model_extension_module_reverb->importOrdersFromReverb($settings);

            $this->response->setOutput(json_encode([
                'success' => true,
                'message' => sprintf($this->language->get('text_orders_imported'), $result['imported'], $result['skipped']),
            ]));

        } catch (Exception $e) {
            $this->response->setOutput(json_encode(['success' => false, 'error' => $e->getMessage()]));
        }
    }

    private function safeLog($product_id, $direction, $status, $message) {
        try {
            $this->model_extension_module_reverb->log($product_id, $direction, $status, $message);
        } catch (Exception $e) {
            // Log table missing or unavailable — ignore silently.
        }
    }

    // -------------------------------------------------------------------------
    // Per-product Reverb tab (AJAX — loaded into product edit page)
    // URL: extension/module/reverb/productTab?product_id=N
    // -------------------------------------------------------------------------

    public function productTab() {
        if (!$this->user->isLogged()) {
            $this->response->setOutput('');
            return;
        }

        $this->load->language('extension/module/reverb');
        $this->load->model('extension/module/reverb');

        $product_id = isset($this->request->get['product_id']) ? (int)$this->request->get['product_id'] : 0;
        $reverb_row = $this->model_extension_module_reverb->getProductMap($product_id);

        $data = [
            'product_id'                => $product_id,
            'reverb_sync_enabled'       => $reverb_row ? (int)$reverb_row['sync_enabled']      : 0,
            'reverb_condition_uuid'     => $reverb_row ? $reverb_row['condition_uuid']          : '',
            'reverb_category_uuid'      => $reverb_row ? $reverb_row['reverb_category_uuid']   : '',
            'reverb_listing_id'         => $reverb_row ? $reverb_row['reverb_listing_id']       : '',
            'reverb_handmade'           => $reverb_row ? (int)$reverb_row['handmade']           : 0,
            'reverb_upc_does_not_apply' => $reverb_row ? (int)$reverb_row['upc_does_not_apply'] : 1,
            'reverb_conditions'         => $this->model_extension_module_reverb->getListingConditions(),
            'reverb_categories_grouped' => $this->model_extension_module_reverb->getReverbCategoriesGrouped(),
            'clear_listing_url'         => $this->url->link('extension/module/reverb/clearListingId', 'user_token=' . $this->session->data['user_token'], true),
        ];

        $this->response->setOutput($this->load->view('extension/module/reverb_product', $data));
    }

    // -------------------------------------------------------------------------
    // Clear Reverb listing ID from a product (AJAX)
    // -------------------------------------------------------------------------

    public function clearListingId() {
        $this->load->language('extension/module/reverb');
        $this->load->model('extension/module/reverb');
        $this->response->addHeader('Content-Type: application/json');
        if (!$this->user->hasPermission('modify', 'extension/module/reverb')) {
            $this->response->setOutput(json_encode(['success' => false, 'error' => $this->language->get('error_permission')]));
            return;
        }
        $product_id = (int)($this->request->get['product_id'] ?? 0);
        if (!$product_id) {
            $this->response->setOutput(json_encode(['success' => false, 'error' => 'Invalid product ID.']));
            return;
        }
        $this->model_extension_module_reverb->clearListingId($product_id);
        $this->response->setOutput(json_encode(['success' => true]));
    }

    // -------------------------------------------------------------------------
    // Clear sync log (AJAX)
    // -------------------------------------------------------------------------

    public function clearLog() {
        $this->load->language('extension/module/reverb');
        $this->load->model('extension/module/reverb');
        $this->response->addHeader('Content-Type: application/json');
        if (!$this->user->hasPermission('modify', 'extension/module/reverb')) {
            $this->response->setOutput(json_encode(['success' => false, 'error' => $this->language->get('error_permission')]));
            return;
        }
        $this->model_extension_module_reverb->clearSyncLog();
        $this->response->setOutput(json_encode(['success' => true, 'message' => $this->language->get('text_log_cleared')]));
    }

    // -------------------------------------------------------------------------
    // Reverb categories (AJAX — for category mapping dropdowns)
    // -------------------------------------------------------------------------

    public function reverbCategories() {
        $this->load->model('extension/module/reverb');

        $categories = $this->model_extension_module_reverb->getReverbCategories();

        $this->response->addHeader('Content-Type: application/json');
        $this->response->setOutput(json_encode(['categories' => $categories]));
    }

    // -------------------------------------------------------------------------
    // Per-product tab (loaded inline via OCMOD template include)
    // The data is passed through the OCMOD PHP patch, not via a separate request.
    // -------------------------------------------------------------------------

    // -------------------------------------------------------------------------
    // Helpers
    // -------------------------------------------------------------------------

    private function validate() {
        if (!$this->user->hasPermission('modify', 'extension/module/reverb')) {
            $this->error['warning'] = $this->language->get('error_permission');
        }

        $token = $this->request->post['module_reverb_api_token'] ?? '';
        if (empty(trim($token))) {
            $this->error['warning'] = $this->language->get('error_api_token');
        }

        return empty($this->error);
    }

    private function buildBreadcrumbs() {
        return [
            'heading_title' => $this->language->get('heading_title'),
            'breadcrumbs'   => [
                [
                    'text' => $this->language->get('text_home'),
                    'href' => $this->url->link('common/dashboard', 'user_token=' . $this->session->data['user_token'], true),
                ],
                [
                    'text' => $this->language->get('text_extension'),
                    'href' => $this->url->link('marketplace/extension', 'user_token=' . $this->session->data['user_token'] . '&type=module', true),
                ],
                [
                    'text' => $this->language->get('heading_title'),
                    'href' => $this->url->link('extension/module/reverb', 'user_token=' . $this->session->data['user_token'], true),
                ],
            ],
        ];
    }

    private function buildSettings() {
        // config_url is often empty in OC3; fall back to the catalog constants from admin/config.php
        $store_url = $this->config->get('config_url');
        if (empty($store_url)) {
            if (defined('HTTPS_CATALOG')) {
                $store_url = HTTPS_CATALOG;
            } elseif (defined('HTTP_CATALOG')) {
                $store_url = HTTP_CATALOG;
            }
        }

        $order_stores = $this->config->get('module_reverb_order_stores');
        if (!is_array($order_stores) || empty($order_stores)) {
            $order_stores = [0];
        }

        return [
            'api_token'              => $this->config->get('module_reverb_api_token'),
            'sync_direction'         => $this->config->get('module_reverb_sync_direction') ?? 'push',
            'shipping_domestic'      => $this->config->get('module_reverb_shipping_domestic') ?? '0',
            'shipping_international' => $this->config->get('module_reverb_shipping_international') ?? '0',
            'currency'               => $this->config->get('config_currency') ?? 'AUD',
            'store_url'              => $store_url ?? '',
            'order_stores'           => $order_stores,
            'default_qty'            => max(1, (int)($this->config->get('module_reverb_default_qty') ?? 1)),
        ];
    }

    private function getCategoryTree() {
        $language_id = (int)$this->config->get('config_language_id');

        $query = $this->db->query("
            SELECT c.category_id, c.parent_id, cd.name
            FROM `" . DB_PREFIX . "category` c
            LEFT JOIN `" . DB_PREFIX . "category_description` cd
                ON cd.category_id = c.category_id AND cd.language_id = '" . $language_id . "'
            WHERE c.status = 1
            ORDER BY c.parent_id ASC, cd.name ASC
        ");

        $all    = $query->rows;
        $byPid  = [];
        foreach ($all as $row) {
            $byPid[(int)$row['parent_id']][] = $row;
        }

        $result = [];
        $stack  = [[0, '']];
        while ($stack) {
            [$pid, $indent] = array_pop($stack);
            if (empty($byPid[$pid])) {
                continue;
            }
            foreach (array_reverse($byPid[$pid]) as $cat) {
                $result[] = [
                    'category_id' => $cat['category_id'],
                    'name'        => $indent . $cat['name'],
                ];
                array_push($stack, [(int)$cat['category_id'], $indent . '&nbsp;&nbsp;&nbsp;']);
            }
        }

        return $result;
    }
}