_ = require('underscore')
events = require('./events')
WebSocket = require('ws')

class Connection extends events.Events
    # Connection constructor
    # A very simple wrapper class around a web socket connection which knows about the kind of message a myo can receive
    # @param {object} configuration
    constructor: (configuration) ->
        super
        @configuration = _.extend({}, @defaultConfiguration, configuration)
        @url = @configuration.socketUrl + @configuration.apiVersion
        @socket = new @SocketClass(@configuration.socketUrl)
        @socket.onmessage = @onMessage

    SocketClass: WebSocket
    defaultConfiguration: {
        socketUrl: "ws://127.0.0.1:10138/myo/"
        apiVersion: 1
    }
    messageTypes: {
        event: 'event'
    }

    onMessage: (message) =>
        data = JSON.parse(message.data)
        messageType = data[0]
        eventData = data[1]

        if messageType != @messageTypes.event
            throw new Error('Unknown message received: ' + message.toString())

        @trigger('message', eventData)

    close: () ->
        @socket.close() # not sure about that

_.extend(exports, {
    Connection: Connection
})