function fetch_feed_content($url) {
    $response = wp_remote_get($url);
    if (is_wp_error($response)) {
        return false;
    }

    return wp_remote_retrieve_body($response);
}

function ae_update_news_ajax() {
    check_ajax_referer('ae_nonce', 'security');
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized user');
    }

    $selected_feed = sanitize_text_field($_POST['feeds']);

    if ($selected_feed == 'all') {
        $feeds = get_option('ae_feeds', array());
        $feed_urls = array_values(array_column($feeds, 'url'));
    } else {
        $feed_urls = array($selected_feed);
    }

    if (empty($feed_urls)) {
        $response = array('error' => 'Nenhum feed selecionado.');
        echo json_encode($response);
        wp_die();
    }

    $feed_data = array();
    $now = new DateTime();

    foreach ($feed_urls as $feed_url) {
        $feed_content = fetch_feed_content($feed_url);
        if ($feed_content === false) {
            $response = array('error' => 'Não foi possível acessar o feed: ' . esc_url($feed_url));
            echo json_encode($response);
            wp_die();
        }

        $feed_xml = simplexml_load_string($feed_content);
        if ($feed_xml === false) {
            $response = array('error' => 'Erro ao processar o XML do feed: ' . esc_url($feed_url));
            echo json_encode($response);
            wp_die();
        }

        foreach ($feed_xml->channel->item as $item) {
            $pubDate = new DateTime((string) $item->pubDate);
            $interval = $now->diff($pubDate);
            if ($interval->days >= 1) {
                continue;
            }

            $title = sanitize_text_field((string) $item->title);
            $description = wp_kses_post((string) $item->description);
            $source = sanitize_text_field((string) $feed_xml->channel->title);
            $date = $pubDate->format('Y-m-d H:i:s');

            $feed_data[] = array(
                'title' => $title,
                'description' => $description,
                'source' => $source,
                'date' => $date
            );
        }
    }

    $collected_posts = get_option('ae_collected_posts', array());
    $titles = array_column($collected_posts, 'title');
    foreach ($feed_data as $data) {
        if (!in_array($data['title'], $titles)) {
            $collected_posts[] = $data;
        }
    }

    usort($collected_posts, function($a, $b) {
        return strtotime($b['date']) - strtotime($a['date']);
    });

    update_option('ae_collected_posts', $collected_posts);

    if (empty($feed_data)) {
        $response = array(
            'progress' => 100,
            'message' => 'Nenhuma nova notícia encontrada.',
            'new_results' => $collected_posts,
            'finished' => true
        );
    } else {
        $response = array(
            'progress' => 100,
            'message' => 'Atualização concluída!',
            'new_results' => $collected_posts,
            'finished' => true
        );
    }

    echo json_encode($response);
    wp_die();
}
add_action('wp_ajax_ae_update_news_ajax', 'ae_update_news_ajax');

function fetch_and_save_news_ajax() {
    check_ajax_referer('ae_nonce', 'security');
    if (!current_user_can('manage_options')) {
        wp_send_json_error('Você não tem permissão para realizar esta ação.');
    }

    $feed_name = sanitize_text_field($_POST['feed_name']);
    $feed_url = esc_url_raw($_POST['feed_url']);
    $use_news_api = sanitize_text_field($_POST['use_news_api']);

    if (empty($feed_name) || empty($feed_url)) {
        wp_send_json_error('Nome do feed e URL são obrigatórios.');
    }

    $collected_posts = fetch_and_save_news($feed_name, $feed_url, $use_news_api);

    if ($collected_posts) {
        wp_send_json_success($collected_posts);
    } else {
        wp_send_json_error('Erro ao coletar notícias. Verifique a URL do feed ou a chave API.');
    }
}
add_action('wp_ajax_fetch_and_save_news_ajax', 'fetch_and_save_news_ajax');

function fetch_and_save_news($feed_name, $feed_url, $use_news_api) {
    $articles = array();
    if ($use_news_api) {
        $articles = fetch_news_from_api($feed_name);
    } else {
        $feed_content = fetch_feed_content($feed_url);
        if ($feed_content) {
            $feed_xml = simplexml_load_string($feed_content);
            foreach ($feed_xml->channel->item as $item) {
                $articles[] = array(
                    'title' => sanitize_text_field($item->title),
                    'description' => wp_kses_post($item->description),
                    'url' => esc_url($item->link),
                    'date' => date('Y-m-d H:i:s', strtotime($item->pubDate))
                );
            }
        } else {
            return false;
        }
    }

    $collected_posts = get_option('ae_collected_posts', array());
    $titles = array_column($collected_posts, 'title');

    foreach ($articles as $article) {
        if (!in_array($article['title'], $titles)) {
            $collected_posts[] = $article;
        }
    }

    usort($collected_posts, function($a, $b) {
        return strtotime($b['date']) - strtotime($a['date']);
    });

    update_option('ae_collected_posts', $collected_posts);
    return $collected_posts;
}

function fetch_news_from_api($feed_name) {
    $api_key = get_option('news_api_key', '');
    if (empty($api_key)) {
        return false;
    }

    $url = 'https://newsapi.org/v2/everything?' . http_build_query(array(
        'q' => $feed_name,
        'apiKey' => $api_key
    ));

    $response = wp_remote_get($url);
    if (is_wp_error($response)) {
        return false;
    }

    $body = wp_remote_retrieve_body($response);
    $data = json_decode($body, true);

    if (empty($data['articles'])) {
        return array();
    }

    $articles = array();
    foreach ($data['articles'] as $article) {
        $articles[] = array(
            'title' => sanitize_text_field($article['title']),
            'description' => wp_kses_post($article['description']),
            'url' => esc_url($article['url']),
            'date' => date('Y-m-d H:i:s', strtotime($article['publishedAt']))
        );
    }

    return $articles;
}
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