var express = require('ultimate-express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');

var index = require('./routes/index');
var apis = require('./routes/apis');
var basePath = require('./config.js').base_path || '/';
var strings = require('./strings.js');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

// uncomment after placing your favicon in /public
app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json({ limit: '512mb' }));
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(basePath, express.static(path.join(__dirname, 'public')));

// handle language
var baseRoute = basePath + ':lang(' + Object.keys(strings).join('|') + ')?';
app.use(baseRoute, function(req, res, next) {
	res.locals.lang = req.params.lang || 'zh-cn';
	res.locals.langs = Object.fromEntries(Object.keys(strings).map(function(lang) {
		return [lang, new Intl.DisplayNames([lang], { type: 'language' }).of(lang)];
	}));
	res.locals.strings = strings[res.locals.lang];
	res.locals.base_path = basePath;
	next();
});
app.use(baseRoute, index);

// apis
app.use(basePath + 'api', apis);

// service worker
app.get(basePath + 'sw.js', function(req, res, next) {
	res.sendFile(path.join(__dirname, 'public/javascripts/sw.js'));
});

// catch 404 and forward to error handler
app.use(function(req, res, next) {
	var err = new Error('Not Found');
	err.status = 404;
	next(err);
});

// error handler
app.use(function(err, req, res, next) {
	// set locals, only providing error in development
	res.locals.error = req.app.get('env') === 'development' ? err : {};

	// render the error page
	res.status(err.status || 500);
	res.render('error');
});

module.exports = app;