AuthenticationManager = require ("./AuthenticationManager")
LoginRateLimiter = require("../Security/LoginRateLimiter")
UserGetter = require "../User/UserGetter"
UserUpdater = require "../User/UserUpdater"
Metrics = require('../../infrastructure/Metrics')
logger = require("logger-sharelatex")
querystring = require('querystring')
Url = require("url")
Settings = require "settings-sharelatex"

module.exports = AuthenticationController =
	login: (req, res, next = (error) ->) ->
		email = req.body?.email?.toLowerCase()
		password = req.body?.password
		redir = Url.parse(req.body?.redir or "/project").path
		LoginRateLimiter.processLoginRequest email, (err, isAllowed)->
			if !isAllowed
				logger.log email:email, "too many login requests"
				res.statusCode = 429
				return res.send
					message:
						text: req.i18n.translate("to_many_login_requests_2_mins"),
						type: 'error'
			AuthenticationManager.authenticate email: email, password, (error, user) ->
				return next(error) if error?
				if user?
					LoginRateLimiter.recordSuccessfulLogin email
					AuthenticationController._recordSuccessfulLogin user._id
					AuthenticationController.establishUserSession req, user, (error) ->
						return next(error) if error?
						req.session.justLoggedIn = true
						logger.log email: email, user_id: user._id.toString(), "successful log in"
						res.send redir: redir
				else
					AuthenticationController._recordFailedLogin()
					logger.log email: email, "failed log in"
					res.send message:
						text: req.i18n.translate("email_or_password_wrong_try_again"),
						type: 'error'

	getAuthToken: (req, res, next = (error) ->) ->
		AuthenticationController.getLoggedInUserId req, (error, user_id) ->
			return next(error) if error?
			AuthenticationManager.getAuthToken user_id, (error, auth_token) ->
				return next(error) if error?
				res.send(auth_token)

	getLoggedInUserId: (req, callback = (error, user_id) ->) ->
		if req?.session?.user?._id?
			callback null, req.session.user._id.toString()
		else
			callback null, null

	getLoggedInUser: (req, options = {allow_auth_token: false}, callback = (error, user) ->) ->
		if typeof(options) == "function"
			callback = options
			options = {allow_auth_token: false}

		if req.session?.user?._id?
			query = req.session.user._id
		else if req.query?.auth_token? and options.allow_auth_token
			query = { auth_token: req.query.auth_token }
		else
			return callback null, null

		UserGetter.getUser query, callback

	requireLogin: (options = {allow_auth_token: false, load_from_db: false}) ->
		doRequest = (req, res, next = (error) ->) ->
			load_from_db = options.load_from_db
			if req.query?.auth_token? and options.allow_auth_token
				load_from_db = true
			if load_from_db
				AuthenticationController.getLoggedInUser req, { allow_auth_token: options.allow_auth_token }, (error, user) ->
					return next(error) if error?
					return AuthenticationController._redirectToLoginOrRegisterPage(req, res) if !user?
					req.user = user
					return next()
			else
				if !req.session.user?
					AuthenticationController._redirectToLoginOrRegisterPage(req, res) 
				else
					req.user = req.session.user
					return next()

		return doRequest

	_globalLoginWhitelist: []
	addEndpointToLoginWhitelist: (endpoint) ->
		AuthenticationController._globalLoginWhitelist.push endpoint

	requireGlobalLogin: (req, res, next) ->
		if req.url in AuthenticationController._globalLoginWhitelist
			return next()

		if req.headers['authorization']?
			return AuthenticationController.httpAuth(req, res, next)
		else if req.session.user?
			return next()
		else
			return res.redirect "/login"

	httpAuth: require('express').basicAuth (user, pass)->
		isValid = Settings.httpAuthUsers[user] == pass
		if !isValid
			logger.err user:user, pass:pass, "invalid login details"
		return isValid

	_redirectToLoginOrRegisterPage: (req, res)->
		if req.query.zipUrl? or req.query.project_name?
			return AuthenticationController._redirectToRegisterPage(req, res) 
		else
			AuthenticationController._redirectToLoginPage(req, res) 


	_redirectToLoginPage: (req, res) ->
		logger.log url: req.url, "user not logged in so redirecting to login page"
		req.query.redir = req.path
		url = "/login?#{querystring.stringify(req.query)}"
		res.redirect url
		Metrics.inc "security.login-redirect"

	_redirectToRegisterPage: (req, res) ->
		logger.log url: req.url, "user not logged in so redirecting to register page"
		req.query.redir = req.path
		url = "/register?#{querystring.stringify(req.query)}"
		res.redirect url
		Metrics.inc "security.login-redirect"

	_recordSuccessfulLogin: (user_id, callback = (error) ->) ->
		UserUpdater.updateUser user_id.toString(), {
			$set: { "lastLoggedIn": new Date() },
			$inc: { "loginCount": 1 }
		}, (error) ->
			callback(error) if error?
			Metrics.inc "user.login.success"
			callback()

	_recordFailedLogin: (callback = (error) ->) ->
		Metrics.inc "user.login.failed"
		callback()

	establishUserSession: (req, user, callback = (error) ->) ->
		lightUser =
			_id: user._id
			first_name: user.first_name
			last_name: user.last_name
			isAdmin: user.isAdmin
			email: user.email
			referal_id: user.referal_id
		# Regenerate the session to get a new sessionID (cookie value) to
		# protect against session fixation attacks
		oldSession = req.session
		req.sessionStore.generate(req)
		for key, value of oldSession
			req.session[key] = value

		req.session.user = lightUser
		callback()