/*
 * This file is part of the authRXBN single sign-on package.
 *
 * (c) Ruben Meyer <contact@rxbn.de>
 */

var express = require('express');
var route = express.Router();

var fs = require('fs');
var path = require('path');

var fileCheck = (file) => {
	if(typeof global['gds'].cache.web == 'undefined') global['gds'].cache.web = {};
	let dir = global['__dirname'] + '/bin/web/views';
	let path_j = path.join(dir, file.toLowerCase());
	if(typeof global['gds'].cache.web[path_j] == 'undefined') {
		if(fs.existsSync(path_j+'.pug')) {
			global['gds'].cache.web[path_j] = true;
		} else {
			global['gds'].cache.web[path_j] = false;
		}
	}

	if(global['gds'].cache.web[path_j] === true) {
		return path_j;
	} else {
		return false;
	}
};

/**
 * main page
 * @url /
 * @method all
 */
route.all('/', function(req, res, next) {
	// TODO: show login page or dashboard
	// res.end('login or dashboard');
	global['modules'].database.getApps((err, rep) => {
		res.render('index', {
			session: req.session,
			apps: rep
		});
	})
});

/**
 * login page or apprequest page
 * @url /
 * @method GET
 */
route.get('/authenticate', (req, res) => {

	if(req.session) {
		// if there isnt an apprequest
		if(!req.session.appRequest)
			req.session.appRequest = {}; // TODO: data
	}

	// query apps
	global['modules'].database.getApps((err, rep) => {
		// set appId in appRequest
		if(req.query.appId) {
			if(req.query.appId && typeof req.query.appId == "string") {
				// req.query.appId
				// verify appId (if in rep)
				req.session.appRequest.appId = req.query.appId;

				// TODO: on accept, setAuthCode and redirect with token
				// on cancel, redirect to dashboard
			}
		}

		// if user is logged in, show request page
		if(req.session && req.session.user) {
			res.render('request', {
				session: req.session,
				appRequest: req.session.appRequest,
				apps: rep
			});
		// if user isnt logged in, show login page
		} else {
			if(!req.query.appId) req.session.appRequest = {};

			let view_obj = { session: req.session };
			if(req.query.appId) {
				rep.forEach((app) => {
					if(app._id == req.query.appId)
						view_obj["login_title"] = "Login to use "+app.name+" via authRxbn"; // appRequest app name
				})

			}

			res.render('login', view_obj);
		}
	});
});

/**
 * all other routes
 * @url /*
 * @method all
 * @TODO comments
 */
route.all('/*', (req, res, next) => {
	// passthrough to next route
	if(req.path.startsWith('/api'))
		return next();

	if(req.path == "/request") return res.render('error/404');

	let pathRules = require("./rules");

	let group = "anon";
	if(req.session && req.session.user) {
		group = "user";
		if(req.session.user.group == 999) group = "admin";
	}

	pathRules.forEach((rule) => {
		if(rule.rule == "block") {
			if(group == rule.group) {
				let regex = new RegExp(rule.expression, "g");
				if(regex.test(req.path)) {
					if(rule.type == "404") {
						return res.status(404).render('error/404', {
							error_code: 404,
							error_msg: 'msg.request.file.not_found',
							session: req.session
						});
					} else if(rule.type == "missing_permission") {
						return res.status(401).render('error/permission', {
							error_code: 401,
							session: req.session
						});
					} else if(rule.type == "login") {
						return res.status(401).render('error/login', {
							error_code: 401,
							session: req.session
						});
					} else {
						return res.status(401).render('error/error', {
							error_code: 401,
							session: req.session
						});
					}
				}
			}
		}
	});

	if(fileCheck(req.path)) {
		return res.render(req.path.replace(/^\//, ''), {
			session: req.session,
			cfg: global['gds'].cfg
		});
	} else {
		return res.status(404).render('error/404', {
			error_code: 404,
			error_msg: 'msg.request.file.not_found',
			session: req.session
		});
	}

	// TODO: try to login
	// TODO: role-based authorization
	// TODO: show login page or page
});

module.exports = route;