const ARCHIVE_API_URL = "https://archive.org/wayback/available?url=";
const ARCHIVE_SAVE_URL = "https://web.archive.org/save/";

/**
 * Check if a given URL exists in Archive.org.
 * @param {string} url - The URL to check.
 * @returns {Promise<string|null>} - The archive URL if found, otherwise null.
 */
async function getArchiveUrl(url) {
    try {
        const response = await fetch(`${ARCHIVE_API_URL}${encodeURIComponent(url)}`);
        if (!response.ok) throw new Error(`HTTP error! Status: ${response.status}`);
        const data = await response.json();
        return data.archived_snapshots?.closest?.url || null;
    } catch (error) {
        console.error(`❌ Archive.org API error: ${error.message}`);
        return null;
    }
}

/**
 * Request Archive.org to save the given URL.
 * @param {string} url - The URL to archive.
 * @returns {Promise<string|null>} - The permalink of the archived page if successful, otherwise null.
 */
async function saveToArchive(url) {
    try {
        const response = await fetch(`${ARCHIVE_SAVE_URL}${encodeURIComponent(url)}`, { method: "POST" });
        if (!response.ok) throw new Error(`HTTP error! Status: ${response.status}`);
        return response.url.includes("/save/") ? null : response.url;
    } catch (error) {
        console.error(`❌ Failed to save URL to Archive.org: ${error.message}`);
        return null;
    }
}

module.exports = { getArchiveUrl, saveToArchive };