// Feedback route — proxies bug reports and feature requests to GitLab Issues API
// Keeps the GitLab PAT server-side so it's never exposed to the browser.

const express = require('express');
const https = require('https');
const http = require('http');
const { requireAuth } = require('../middleware/auth');

function createFeedbackRouter() {
    const router = express.Router();

    const GITLAB_URL = process.env.GITLAB_URL || '';
    const GITLAB_PROJECT_ID = process.env.GITLAB_PROJECT_ID || '';
    const GITLAB_PAT = process.env.GITLAB_PAT || '';

    router.post('/', requireAuth(), async (req, res) => {
        if (!GITLAB_URL || !GITLAB_PROJECT_ID || !GITLAB_PAT) {
            return res.status(503).json({ error: 'Feedback integration not configured' });
        }

        const { type, title, description, page } = req.body;

        if (!type || !title || !description) {
            return res.status(400).json({ error: 'type, title, and description are required' });
        }

        if (!['bug', 'feature'].includes(type)) {
            return res.status(400).json({ error: 'type must be "bug" or "feature"' });
        }

        const labels = type === 'bug' ? 'bug' : 'enhancement';
        const prefix = type === 'bug' ? '🐛 Bug' : '✨ Feature Request';
        const username = req.user?.username || 'unknown';

        const body = [
            `**Submitted by:** ${username}`,
            page ? `**Page:** ${page}` : null,
            `**Type:** ${prefix}`,
            '',
            '---',
            '',
            description,
        ].filter(Boolean).join('\n');

        const postData = JSON.stringify({
            title: `[${prefix}] ${title}`,
            description: body,
            labels,
        });

        const apiUrl = `${GITLAB_URL.replace(/\/$/, '')}/api/v4/projects/${encodeURIComponent(GITLAB_PROJECT_ID)}/issues`;

        try {
            const result = await new Promise((resolve, reject) => {
                const parsed = new URL(apiUrl);
                const transport = parsed.protocol === 'https:' ? https : http;

                const reqOpts = {
                    method: 'POST',
                    hostname: parsed.hostname,
                    port: parsed.port,
                    path: parsed.pathname + parsed.search,
                    headers: {
                        'Content-Type': 'application/json',
                        'PRIVATE-TOKEN': GITLAB_PAT,
                        'Content-Length': Buffer.byteLength(postData),
                    },
                    rejectAuthorized: false,
                };

                const apiReq = transport.request(reqOpts, (apiRes) => {
                    let data = '';
                    apiRes.on('data', chunk => data += chunk);
                    apiRes.on('end', () => {
                        try {
                            resolve({ status: apiRes.statusCode, body: JSON.parse(data) });
                        } catch {
                            resolve({ status: apiRes.statusCode, body: data });
                        }
                    });
                });

                apiReq.on('error', reject);
                apiReq.write(postData);
                apiReq.end();
            });

            if (result.status === 201) {
                console.log(`[Feedback] Issue #${result.body.iid} created by ${username}: ${title}`);
                res.json({
                    success: true,
                    issue: {
                        id: result.body.iid,
                        url: result.body.web_url,
                        title: result.body.title,
                    },
                });
            } else {
                console.error(`[Feedback] GitLab API returned ${result.status}:`, result.body);
                res.status(502).json({ error: 'GitLab API error', details: result.body });
            }
        } catch (err) {
            console.error('[Feedback] Request failed:', err.message);
            res.status(502).json({ error: 'Failed to connect to GitLab' });
        }
    });

    return router;
}

module.exports = createFeedbackRouter;