const { formatMessage } = require('./formatters')
const { handleGitea } = require('./gitea')
const { handleGithub } = require('./github')
// Store for already reported commit hashes (in-memory, resets on restart)
const reportedCommits = new Set();
const commitTimestamps = new Map();

// TTL constants (used in cleanup)
const COMMIT_TTL = 30 * 24 * 60 * 60 * 1000; // 30 days

/**
 * Cleanup old commits (called by Vercel Cron)
 * @param {Object} req - Express request object
 * @param {Object} res - Express response object
 */
const cleanup = (req, res) => {
    const now = Date.now();
    let cleaned = 0;
    
    for (const [hash, timestamp] of commitTimestamps.entries()) {
        if (now - timestamp > COMMIT_TTL) {
            commitTimestamps.delete(hash);
            reportedCommits.delete(hash);
            cleaned++;
        }
    }
    
    res.status(200).json({ cleaned });
};

/**
 * Webhook handler that supports both JSON and x-www-form-urlencoded formats
 * @param {Object} req - Express request object
 * @param {Object} res - Express response object
 */
const webhook = async (req, res) => {
    try {
        const payload = typeof req.body === 'string' ? JSON.parse(req.body) : req.body
        
        if (!payload || !payload.repository) {
            return res.status(400).send('Invalid webhook payload')
        }

        // Determine webhook type and handle accordingly
        const message = payload.repository.owner?.username // Gitea specific field
            ? handleGitea(payload, reportedCommits, commitTimestamps)
            : handleGithub(payload, reportedCommits, commitTimestamps)

        if (!message) {
            return res.status(200).send('No new commits to report')
        }

        // Send to Telegram
        const telegramUrl = `https://api.telegram.org/bot${process.env.TELEGRAM_BOT_TOKEN}/sendMessage`
        await fetch(telegramUrl, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({
                chat_id: `-100${process.env.TELEGRAM_CHAT_ID}`,
                text: message,
                parse_mode: 'Markdown',
                disable_web_page_preview: true
            })
        })

        res.status(200).send('ok')
    } catch (error) {
        console.error('Error processing webhook:', error)
        res.status(500).send(`Error: ${error.message}`)
    }
}

// Export both handlers
module.exports = {
    webhook,
    cleanup
};