<?php

if (!defined('ABSPATH')) {
    exit;
}

if (!class_exists('WPAIC_Ajax')) {
    class WPAIC_Ajax
    {
        // ... class content ...
        public function __construct()
        {
            add_action('wp_ajax_wpaic_process', array($this, 'process_request'));
            add_action('wp_ajax_nopriv_wpaic_process', array($this, 'process_request'));
        }

        public function process_request()
        {
            // 1. Security Check
            check_ajax_referer('wpaic_nonce', 'nonce');

            // 2. Get Data
            $user_message = isset($_POST['message']) ? sanitize_text_field(wp_unslash($_POST['message'])) : '';
            // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
            $context_raw = isset($_POST['context']) ? wp_unslash($_POST['context']) : array();
            $context = is_array($context_raw) ? $context_raw : array();

            $context_title = isset($context['title']) ? sanitize_text_field($context['title']) : '';
            $context_h1 = isset($context['h1']) ? sanitize_text_field($context['h1']) : '';
            $context_price = isset($context['price']) ? sanitize_text_field($context['price']) : '';
            $context_sizes = isset($context['sizes']) ? sanitize_text_field($context['sizes']) : '';
            $context_colors = isset($context['colors']) ? sanitize_text_field($context['colors']) : '';
            $context_desc = isset($context['description']) ? sanitize_textarea_field($context['description']) : '';

            if (empty($user_message)) {
                wp_send_json_error(array('message' => esc_html__('Message is empty.', 'aiy-sales-chat')));
            }

            $api_key = get_option('wpaic_gemini_api_key');
            if (empty($api_key)) {
                wp_send_json_error(array('message' => 'API Key is missing.'));
            }

            // 3. Construct Prompt with Backend Data (WooCommerce)
            $product_id = isset($_POST['product_id']) ? intval($_POST['product_id']) : 0;

            if ($product_id > 0 && function_exists('wc_get_product')) {
                $product = wc_get_product($product_id);
                if ($product) {
                    // Get Attributes
                    $attributes_str = '';
                    foreach ($product->get_attributes() as $attribute) {
                        if ($attribute->is_taxonomy()) {
                            // phpcs:ignore WordPress.DB.DirectDatabaseQuery
                            $terms = wc_get_product_terms($product->get_id(), $attribute->get_name(), array('fields' => 'names'));
                            $attributes_str .= $attribute->get_name() . ': ' . implode(', ', $terms) . "\n";
                        } else {
                            $attributes_str .= $attribute->get_name() . ': ' . implode(', ', $attribute->get_options()) . "\n";
                        }
                    }

                    $context_title = $product->get_name();
                    $context_h1 = $product->get_name();
                    $context_price = $product->get_price_html(); // Formatted price
                    $context_sizes = empty($context_sizes) ? $attributes_str : $context_sizes; // Prefer backend, fallback to scraped
                    $context_status = $product->get_stock_status(); // instock / outofstock
                    $context_desc = wp_strip_all_tags($product->get_short_description() . "\n" . $product->get_description());
                }
            }

            $html_context = "
Page Title: $context_title
Product Name: $context_h1
Price: $context_price
Stock Status: " . ($product ? $product->get_stock_status() : 'Unknown') . "
Attributes/Sizes/Colors: $context_sizes
Description: $context_desc";

            // Default if empty
// Default if empty
            $contact_info_default = "Or via email: contact@example.com";

            $contact_info = get_option('wpaic_contact_info', $contact_info_default);
            $site_locale = get_locale();

            $system_instruction = "You are an expert sales assistant.
Context of the page where the customer is:
$html_context

Contact and company information:
$contact_info

Your task:
- Answer the question: '$user_message'.
- Be short, persuasive, and friendly.
- Use the context data (price, benefits, sizes, colors) to sell the product.
- Answer in the language corresponding to the locale: $site_locale.
- IF YOU DO NOT know the answer or are unsure, politely offer the contact details above.
- When providing contact details, use EXACTLY this format (bulleted list):
* Contact: [Detail]
* Or via email: email@address.com

We look forward to your message!";

            // 4. Call Google Gemini API
            $url = 'https://generativelanguage.googleapis.com/v1beta/models/gemini-flash-latest:generateContent?key=' . $api_key;

            $body = array(
                'contents' => array(
                    array(
                        'parts' => array(
                            array('text' => $system_instruction)
                        )
                    )
                )
            );

            $response = wp_remote_post($url, array(
                'headers' => array('Content-Type' => 'application/json'),
                'body' => json_encode($body),
                'timeout' => 15
            ));

            if (is_wp_error($response)) {
                wp_send_json_error(array('message' => $response->get_error_message()));
            }

            $response_body = wp_remote_retrieve_body($response);
            $json = json_decode($response_body, true);

            if (isset($json['error'])) {
                wp_send_json_error(array('message' => 'AI Error: ' . $json['error']['message']));
            }

            $reply = $json['candidates'][0]['content']['parts'][0]['text'] ?? "I didn't understand, can you repeat?";
            $reply = str_replace("**", "", $reply); // Simple markdown cleanup

            // 5. Log Conversation
            global $wpdb;
            $table_name = $wpdb->prefix . 'wpaic_conversations';
            // phpcs:ignore WordPress.DB.DirectDatabaseQuery
            $result = $wpdb->insert(
                $table_name,
                array(
                    'user_ip' => isset($_SERVER['REMOTE_ADDR']) ? sanitize_text_field(wp_unslash($_SERVER['REMOTE_ADDR'])) : '0.0.0.0',
                    'message' => $user_message,
                    'reply' => $reply,
                    'context' => json_encode($context),
                    'created_at' => current_time('mysql')
                )
            );

            if ($result === false) {
                // DB Error logging skipped for production
            }

            wp_send_json_success(array('reply' => $reply));
        }
    }
}