require('dotenv').config();

const fs = require('node:fs');
const path = require('node:path');
const express = require('express');
const swaggerUi = require('swagger-ui-express');
const YAML = require('yamljs');
const apiRouter = require('./routes/api');

const app = express();
const openApiPath = path.resolve(__dirname, 'openapi.yaml');
const openApiDocument = YAML.parse(fs.readFileSync(openApiPath, 'utf8'));

app.disable('x-powered-by');
app.use(express.json({ limit: '1mb' }));
app.get('/openapi.yaml', (req, res) => res.sendFile(openApiPath));
app.use('/docs', swaggerUi.serve, swaggerUi.setup(openApiDocument));
app.get('/', (req, res) => res.redirect('/docs'));
app.use('/api', apiRouter);

app.use((req, res) => res.status(404).json({
  success: false,
  error: { code: 404, message: 'Not found.' },
}));

app.use((error, req, res, next) => {
  if (res.headersSent) return next(error);
  if (error instanceof SyntaxError && error.status === 400 && 'body' in error) {
    return res.status(400).json({ success: false, error: { code: 400, message: 'Invalid JSON body.' } });
  }
  console.error(error);
  return res.status(500).json({ success: false, error: { code: 500, message: 'Internal server error.' } });
});

module.exports = app;