import { Hono } from 'hono';
import { serveStatic } from 'hono/bun';
import fs from 'fs';
// @ts-ignore Bun project may not have dotenv types configured
import { config } from 'dotenv';

config();

const app = new Hono();

// Minimal log helpers
const logLine = (path: string, line: string) => {
  try {
    fs.appendFileSync(path, `${new Date().toISOString()} ${line}\n`);
  } catch (err) {
    console.error('Failed to write log:', err);
  }
};

// Version endpoint sourced from package.json
app.get('/version', (c) => {
  try {
    const pkgRaw = fs.readFileSync('./package.json', 'utf-8');
    const pkg = JSON.parse(pkgRaw);
    return c.json({ version: pkg.version || '0.0.0' });
  } catch (err) {
    logLine('logs/error.log', `version endpoint error: ${(err as Error)?.message || String(err)}`);
    return c.json({ version: '0.0.0' }, 200);
  }
});

// Serve static files from the frontend directory
app.use('/*', serveStatic({ root: './frontend' }));

// Error handler
app.onError((err, c) => {
  logLine('logs/error.log', `Unhandled error: ${err?.message || err}`);
  return c.text('Internal Server Error', 500);
});

// Mutation logging endpoint
app.post('/log-change', async (c) => {
  try {
    const body = await c.req.json();
    const { action = 'unknown', user = 'unknown', target = '', detail = '' } = body || {};
    const payload = JSON.stringify({ action, user, target, detail });
    logLine('logs/changes.log', payload);
    return c.json({ status: 'ok' });
  } catch (err) {
    logLine('logs/error.log', `log-change error: ${(err as Error)?.message || String(err)}`);
    return c.text('Bad Request', 400);
  }
});

const PORT = Number(process.env.PORT || 3000);

logLine('logs/server.log', `Starting frontend server on port ${PORT}`);

// Graceful shutdown logging
const shutdown = (signal: string) => {
  logLine('logs/server.log', `Shutting down due to ${signal}`);
  process.exit(0);
};
process.on('SIGINT', () => shutdown('SIGINT'));
process.on('SIGTERM', () => shutdown('SIGTERM'));

export default {
  port: PORT,
  fetch: app.fetch,
};