const sqlite3 = require('sqlite3');
const { open } = require('sqlite');
const RSSParser = require('rss-parser');
// Node 18+ has global fetch built-in

const DEFAULT_SERVICES = [
    { name: 'Website', url: 'https://akkolli.net' },
    { name: 'Gitea', url: 'https://code.akkolli.net' },
    { name: 'Nextcloud', url: 'http://host.docker.internal:6060' },
];

async function getServices(db) {
    try {
        const rows = await db.all('SELECT name, url FROM monitored_services');
        if (rows && rows.length > 0) return rows;
    } catch (e) {
        // Table might not exist yet
    }
    return DEFAULT_SERVICES;
}

async function seedDefaults(db) {
    // Ensure monitored_services table exists
    await db.exec(`
    CREATE TABLE IF NOT EXISTS monitored_services (
      id INTEGER PRIMARY KEY AUTOINCREMENT,
      name TEXT NOT NULL UNIQUE,
      url TEXT NOT NULL,
      created_at DATETIME DEFAULT CURRENT_TIMESTAMP
    );
  `);

    // Seed defaults if table is empty
    const count = await db.get('SELECT COUNT(*) as cnt FROM monitored_services');
    if (count.cnt === 0) {
        for (const s of DEFAULT_SERVICES) {
            await db.run(
                'INSERT OR IGNORE INTO monitored_services (name, url) VALUES (?, ?)',
                s.name, s.url
            );
        }
        console.log('Seeded default services into monitored_services');
    }
}

async function setupRssTables(db) {
    await db.exec(`
    CREATE TABLE IF NOT EXISTS rss_feeds (
      id INTEGER PRIMARY KEY AUTOINCREMENT,
      name TEXT NOT NULL,
      url TEXT NOT NULL UNIQUE,
      last_fetched DATETIME,
      created_at DATETIME DEFAULT CURRENT_TIMESTAMP
    );
    CREATE TABLE IF NOT EXISTS rss_items (
      id INTEGER PRIMARY KEY AUTOINCREMENT,
      feed_id INTEGER NOT NULL,
      title TEXT NOT NULL,
      link TEXT NOT NULL UNIQUE,
      pub_date DATETIME,
      creator TEXT,
      snippet TEXT,
      read INTEGER DEFAULT 0,
      bookmarked INTEGER DEFAULT 0,
      created_at DATETIME DEFAULT CURRENT_TIMESTAMP
    );
    CREATE INDEX IF NOT EXISTS idx_rss_items_feed ON rss_items(feed_id);
    CREATE INDEX IF NOT EXISTS idx_rss_items_pubdate ON rss_items(pub_date DESC);
  `);

    // Seed default HN feed
    const count = await db.get('SELECT COUNT(*) as cnt FROM rss_feeds');
    if (count.cnt === 0) {
        await db.run(
            'INSERT INTO rss_feeds (name, url) VALUES (?, ?)',
            'Hacker News', 'https://news.ycombinator.com/rss'
        );
        console.log('Seeded default RSS feed (Hacker News)');
    }
}

async function syncRssFeeds(db) {
    const parser = new RSSParser({ timeout: 5000 });
    const feeds = await db.all('SELECT * FROM rss_feeds');

    for (const feed of feeds) {
        try {
            const parsed = await parser.parseURL(feed.url);
            for (const item of parsed.items || []) {
                if (!item.title || !item.link) continue;
                await db.run(
                    `INSERT OR IGNORE INTO rss_items (feed_id, title, link, pub_date, creator, snippet)
                     VALUES (?, ?, ?, ?, ?, ?)`,
                    feed.id,
                    item.title,
                    item.link,
                    item.pubDate || item.isoDate || null,
                    item.creator || item.author || null,
                    (item.contentSnippet || item.content || '').substring(0, 500) || null
                );
            }
            await db.run(
                'UPDATE rss_feeds SET last_fetched = ? WHERE id = ?',
                new Date().toISOString(), feed.id
            );
            console.log(`RSS synced: ${feed.name} (${(parsed.items || []).length} items)`);
        } catch (err) {
            console.error(`RSS sync error for ${feed.name}:`, err.message);
        }
    }

    // Prune items older than 90 days
    try {
        await db.run(`DELETE FROM rss_items WHERE created_at < datetime('now', '-90 days')`);
    } catch (e) { }
}

async function monitor() {
    console.log('Starting monitoring loop...');

    const dbPath = process.env.DB_PATH || './dashboard.db';

    const db = await open({
        filename: dbPath,
        driver: sqlite3.Database
    });

    // Ensure table exists (in case monitor runs before app)
    await db.exec(`
    CREATE TABLE IF NOT EXISTS uptime_logs (
      id INTEGER PRIMARY KEY AUTOINCREMENT,
      service_name TEXT NOT NULL,
      url TEXT NOT NULL,
      status TEXT NOT NULL,
      latency INTEGER,
      timestamp DATETIME DEFAULT CURRENT_TIMESTAMP
    );
  `);

    await seedDefaults(db);

    // Setup RSS tables and do initial sync
    await setupRssTables(db);
    syncRssFeeds(db); // initial sync, don't await to not block uptime start

    setInterval(async () => {
        console.log('Running checks...');
        const now = new Date().toISOString();

        // Re-read services each interval so new additions are picked up
        const services = await getServices(db);

        for (const service of services) {
            const start = performance.now();
            let status = 'down';
            let latency = 0;

            try {
                const controller = new AbortController();
                const timeout = setTimeout(() => controller.abort(), 5000);

                const res = await fetch(service.url, {
                    method: 'HEAD',
                    signal: controller.signal
                });
                clearTimeout(timeout);

                // Any HTTP response means the service is reachable (up).
                // Only network errors/timeouts (caught below) count as down.
                status = res.status < 500 ? 'up' : 'down';
                const end = performance.now();
                latency = Math.round(end - start);
            } catch (err) {
                status = 'down';
                latency = 0;
            }

            try {
                await db.run(
                    `INSERT INTO uptime_logs (service_name, url, status, latency, timestamp) VALUES (?, ?, ?, ?, ?)`,
                    service.name, service.url, status, latency, now
                );
            } catch (dbErr) {
                console.error('DB Write Error:', dbErr);
            }
        }

        // Prune old logs (keep 400 days for yearly view)
        try {
            await db.run(`DELETE FROM uptime_logs WHERE timestamp < datetime('now', '-400 days')`);
        } catch (e) { }

    }, 60000); // Run every minute

    // RSS sync every 5 minutes
    setInterval(() => syncRssFeeds(db), 5 * 60 * 1000);
}

monitor();