import * as express from 'express';
import { ConfigurationHelper, conf } from "./helpers/ConfigHelper";
import { DatabaseHelper } from "./helpers/DatabaseHelper";
import { Routes, RouteType } from './controllers/Routes';
import { RequestHandler } from './entities/RequestHandler';
import * as fileUpload  from 'express-fileupload';
import * as expressWs from 'express-ws';
import * as ws from 'ws';

/**
 * Main project script
 * 
 * @author Pierre HUBERT
 */

console.info("Comunic API v6\t@author Pierre HUBERT\t2019-" + new Date().getFullYear());

async function init() {
	
	const confFile = process.argv.length < 3 ? "config.json" : process.argv[2];

	console.info("Load configuration from "+confFile+"...");
	ConfigurationHelper.loadConf(confFile);

	console.info("Connect to database");
	await DatabaseHelper.connect();

	// Start HTTP Server
	const app = expressWs(express()).app;

	app.use(express.urlencoded({extended: true}));

	app.use(fileUpload());

	// Check if the server is running behing a proxy
	if(conf().proxy) {
		console.info("Running behind proxy: " + conf().proxy);
		app.set("trust proxy", conf().proxy);
	}

	// Process the list of routes
	Routes.forEach(route => {
		
		// Callback is common to all requests type
		const cb = async (req : express.Request, res : express.Response)=> {
			const handler = new RequestHandler(req, res);

			try {

				// Check API tokens
				await handler.checkAPITokens();

				// Check user tokens
				await handler.checkUserTokens(route.needLogin);

				const cb = route.cb(handler);
				if(cb)
					await cb;

			} catch(e) {
				console.error(e);
				handler.error(500, "Internal error.", false);
			}
		};

		// WebSocket callback
		const wsCB = async (ws: ws, req: express.Request) => {
			try {
				await route.wsCallback(req, ws);
			} catch(e) {
				console.error(e);
			}
		}

		// Call the appropriate function
		switch(route.type) {
			case RouteType.GET:
				app.get(route.path, cb);
				break;
			
			case RouteType.WS:
				app.ws(route.path, wsCB);
				break;
			
			default:
				app.post(route.path, cb);
				break;
		}	

	})

	app.listen(conf().port, () => {
		console.info("Started server on http://127.0.0.1:" + conf().port);
	});
}
init();