// Webex Bot DM Helper
// Fire-and-forget pattern — logs success/failure but never throws.
// Used to notify users when their feedback issues are resolved.

const https = require('https');

const WEBEX_API_URL = 'https://webexapis.com/v1/messages';
const WEBEX_BOT_TOKEN = process.env.WEBEX_BOT_TOKEN || '';

/**
 * Send a direct message to a user via Webex Teams bot.
 * @param {string} email - Recipient's email address
 * @param {string} markdownMessage - Message body (Webex markdown supported)
 */
function sendDirectMessage(email, markdownMessage) {
    if (!WEBEX_BOT_TOKEN) {
        console.warn('[WebexBot] WEBEX_BOT_TOKEN not configured — skipping DM');
        return;
    }

    if (!email || !markdownMessage) {
        console.warn('[WebexBot] Missing email or message — skipping DM');
        return;
    }

    const postData = JSON.stringify({
        toPersonEmail: email,
        markdown: markdownMessage,
    });

    const parsed = new URL(WEBEX_API_URL);

    const reqOpts = {
        method: 'POST',
        hostname: parsed.hostname,
        path: parsed.pathname,
        headers: {
            'Content-Type': 'application/json',
            'Authorization': `Bearer ${WEBEX_BOT_TOKEN}`,
            'Content-Length': Buffer.byteLength(postData),
        },
    };

    const req = https.request(reqOpts, (res) => {
        let data = '';
        res.on('data', chunk => { data += chunk; });
        res.on('end', () => {
            if (res.statusCode >= 200 && res.statusCode < 300) {
                console.log(`[WebexBot] DM sent to ${email} (${res.statusCode})`);
            } else {
                console.error(`[WebexBot] Failed to DM ${email} — ${res.statusCode}: ${data}`);
            }
        });
    });

    req.on('error', (err) => {
        console.error(`[WebexBot] Request error sending DM to ${email}:`, err.message);
    });

    req.write(postData);
    req.end();
}

module.exports = { sendDirectMessage };