<?php
if (!defined('ABSPATH')) exit;

add_action('wp_ajax_aicont_generate_title_suggestion', 'aicont_generate_title_suggestion_handler');

function aicont_generate_title_suggestion_handler() {
    check_ajax_referer('aicont_nonce', 'nonce');

    $post_id = absint($_POST['post_id'] ?? 0);
    $keyword = sanitize_text_field($_POST['keyword'] ?? '');

    if (!$post_id || !get_post($post_id)) {
        wp_send_json_error(['code' => 'err_post_id_invalid']);
    }

    if (empty($keyword)) {
        wp_send_json_error(['code' => 'err_keyword_empty']);
    }

    $active_license = get_option('aicont_active_license', '');
    $active_license = $active_license ? trim(sanitize_text_field($active_license)) : '';

    $result = aicont_call_webtinus_server_for_titles([
        'keyword'       => $keyword,
        'post_id'       => $post_id,
        'api_key'       => $active_license 
    ]);

    if (is_wp_error($result) || empty($result['titles'])) {
        $error_code = $result['error_code'] ?? 'err_titles_empty';
        wp_send_json_error(['code' => $error_code]);
    }

    wp_send_json_success([
        'message' => 'success',
        'titles'  => $result['titles'],
        'count'   => count($result['titles'])
    ]);
}

function aicont_call_webtinus_server_for_titles($args) {
    $client_site_url = home_url('', 'https');
    $server_url = 'https://webtinus.com/wp-json/aicont/v1/generate_title_suggestion';

    $body = wp_json_encode([
        'post_title'      => $args['keyword'],
        'post_id'         => $args['post_id'],
        'client_site_url' => $client_site_url,
        'api_key'         => $args['api_key'] ?? '',      
        'site_title'      => get_bloginfo('name'),
        'site_language'   => get_locale()
    ], JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);

    $response = wp_remote_post($server_url, [
        'headers' => [
            'Content-Type'  => 'application/json',
            'X-Client-Site' => $client_site_url,
            'User-Agent'    => 'AiContify-WordPress-Plugin/1.0'
        ],
        'body'    => $body,
        'timeout' => 180,
        'sslverify' => true
    ]);

    if (is_wp_error($response)) {
        return ['error_code' => 'err_connection_failed'];
    }

    $response_code = wp_remote_retrieve_response_code($response);
    $response_body = wp_remote_retrieve_body($response);
    $data = json_decode($response_body, true);

    if ($response_code !== 200 || empty($data['success'])) {
        $error_code = $data['error_code'] ?? 'err_server_error';
        return ['error_code' => $error_code];
    }

    if (empty($data['titles']) || !is_array($data['titles'])) {
        return ['error_code' => 'err_titles_empty'];
    }

    // Sanitize titles
    $titles = array_map('sanitize_text_field', $data['titles']);

    return ['titles' => $titles];
}