<?php
if (!defined('ABSPATH')) exit;

add_action('wp_ajax_aicont_generate_and_save_content', 'aicont_generate_and_save_content_handler');

function aicont_generate_and_save_content_handler() {
    check_ajax_referer('aicont_nonce', 'nonce');

    $post_id = absint($_POST['post_id'] ?? 0);
    $keyword = sanitize_text_field($_POST['keyword'] ?? '');
    $custom_prompt = sanitize_textarea_field($_POST['custom_prompt'] ?? '');

    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']);
    }

    $post_title = get_the_title($post_id);

    if (empty($custom_prompt)) {
        $custom_prompt = get_post_meta($post_id, 'aicont_singlepost_content_prompt_custom', true);
    }
    if (empty($custom_prompt)) {
        $custom_prompt = get_option('aicont_plugin_content_prompt_custom', '');
    }

    $active_license = get_option('aicont_active_license', '');
    $active_license = $active_license ? trim(sanitize_text_field($active_license)) : '';

    $result = aicont_call_webtinus_server([
        'keyword'       => $keyword,
        'post_id'       => $post_id,
        'post_title'    => $post_title,
        'prompt'        => $custom_prompt,
        'api_key'       => $active_license 
    ]);

    if (is_wp_error($result) || empty($result['content'])) {
        $error_code = $result['error_code'] ?? 'err_content_empty';
        wp_send_json_error(['code' => $error_code]);
    }

    $updated = wp_update_post([
        'ID'           => $post_id,
        'post_content' => wp_kses_post($result['content'])
    ], true);

    if (is_wp_error($updated)) {
        wp_send_json_error(['code' => 'err_save_failed']);
    }

    wp_send_json_success([
        'message' => 'success',
        'content_length' => strlen($result['content'])
    ]);
}

function aicont_call_webtinus_server($args) {
    $client_site_url = home_url('', 'https');
    $server_url = 'https://webtinus.com/wp-json/aicont/v1/generate_contentPosts1';

    $body = wp_json_encode([
        'keyword'         => $args['keyword'],
        'post_id'         => $args['post_id'],
        'client_site_url' => $client_site_url,
        'post_title'      => $args['post_title'] ?? '',
        'prompt'          => $args['prompt'] ?? '',
        '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['content'])) {
        return ['error_code' => 'err_content_empty'];
    }

    return ['content' => trim($data['content'])];
}