fs = require 'fs'
http = require 'http'
crypto = require 'crypto'
xml = require 'node-xml'

# soooo annoying that setTimeout takes the ms arg last
timeout = (ms, func) -> setTimeout func, ms

auth = {}

md5 = (str) ->
	sum = crypto.createHash 'md5'
	sum.update str
	return sum.digest 'hex'

new_auth_token = (user, pass) ->
	token = md5(user + md5(pass))
	auth.user = user
	auth.token = token
	return token

auth_file = "#{process.env.HOME}/.libre.fm-cmus.auth"
save_auth = (user, pass, callback) ->
	token = new_auth_token(user, pass)
	text = JSON.stringify user: user, token: new_auth_token(user, pass)
	fs.writeFile auth_file, text, 'utf8', callback
	return token

# load login credentials from settings file
load_auth = (callback) ->
	if auth.user and auth.token
		callback auth
		return

	fs.readFile auth_file, 'utf8', (err, data) ->
		if err
			callback err
		else
			callback null, JSON.parse data

# login and get a session key
login = (callback) ->
	load_auth (err, auth) ->
		return callback(err) if err?

		http.get { host: 'alpha.libre.fm', port: 80, path: "/2.0/?method=auth.getmobilesession&username=#{auth.user}&authToken=#{auth.token}"}, (res) ->
			if res.statusCode != 200
				console.log "login response code: #{res.statusCode}"
				callback "login response code: #{res.statusCode}"
				return

			res.setEncoding 'utf8'
			body = ''
			res.on 'data', (chunk) ->
				body += chunk
			res.on 'end', ->
				element = ''
				content = ''
				done = false
				huh = ->
					# FIXME switch to an xml parser that will tell me when it's done
					unless done
						done = true
						callback "xml parser failed to do anything with login server response"
						console.log "xml parser didn't exit: #{body}"
				parser = new xml.SaxParser (cb) ->
					cb.onStartElementNS (name, attrs, prefix, uri, namespaces) ->
						element = name
						content = ''
					cb.onCharacters (str) ->
						content += str
					cb.onEndElementNS (name, attrs, prefix, uri, namespaces) ->
						if element is 'key'
							done = true
							auth.sk = content
							console.log("got key \"#{content}\"")
							callback null, content
						else if element is 'error'
							done = true
							callback "login failed: \"#{content}\""
						# ignore other tags stuff in there
					cb.onEndDocument huh
				parser.parseString body
				timeout 1, huh


exports.login = login # fixme remove this from the API and call it automatically
exports.new_auth_token = new_auth_token
exports.save_auth = save_auth