import cfenv from 'cfenv';
import express from 'express';
import mongoose from 'mongoose';
import swagger from 'swagger-ui-express';
import jsonRefParser, {JSONSchema} from '@apidevtools/json-schema-ref-parser';


// tell if server is running in debug or production environment
console.log(process.env.NODE_ENV === 'production' ? '===== PRODUCTION =====' : '===== DEVELOPMENT =====');


// get mongodb address from server, otherwise set to localhost
let connectionString: string = "";
if(process.env.NODE_ENV === 'production') {
  let services = cfenv.getAppEnv().getServices();
  for (let service in services) {
    if(services[service].tags.indexOf("mongodb") >= 0) {
      connectionString = services[service]["credentials"].uri;
    }
  }
}
else {
  connectionString = 'mongodb://localhost/dfopdb';
}
mongoose.connect(connectionString, {useNewUrlParser: true, useUnifiedTopology: true});

// connect to mongodb
let db = mongoose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', () => {
  console.log(`Connected to ${connectionString}`);
});



// create Express app
const app = express();
app.disable('x-powered-by');

// get port from environment, defaults to 3000
const port = process.env.PORT || 3000;

// require routes
app.use('/', require('./routes/root'));

// Swagger UI
let oasDoc: JSONSchema = {};
jsonRefParser.bundle('oas/oas.yaml', (err, doc) => {
  if(err) throw err;
  oasDoc = doc;
  oasDoc.paths = oasDoc.paths.allOf.reduce((s, e) => Object.assign(s, e));
  swagger.setup(oasDoc, {defaultModelsExpandDepth: -1, customCss: '.swagger-ui .topbar { display: none }'});
});
app.use('/api', swagger.serve, swagger.setup(oasDoc, {defaultModelsExpandDepth: -1, customCss: '.swagger-ui .topbar { display: none }'}));

// hook up server to port
app.listen(port, () => {
  console.log(`Listening on http;//localhost:${port}`);
});