/**
* Functions related to VU meters.
* These functions are intimately tied to the markup defined in the
* VU templates in _vu_meters.html.erb
*/
(function(context, $) {

    "use strict";

    context.JK = context.JK || {};

    // As these are helper functions, just have a single
    // static object with functions. Each function should
    // take all necessary arguments to complete its work.
    context.JK.TrackHelpers = {

        getTracks: function(jamClient, groupId) {
            var tracks = [];
            var trackIds = jamClient.SessionGetIDs();
            var allTracks = jamClient.SessionGetControlState(trackIds);

            // get client's tracks
            for (var i=0; i < allTracks.length; i++) {
                if (allTracks[i].group_id === groupId) {
                    tracks.push(allTracks[i]);
                }
            }

            return tracks;
        },

        /**
        * This function resolves which tracks to configure for a user
        * when creating or joining a session. By default, tracks are pulled
        * from jamClient. If none exist there, the first instrument from the
        * user's profile is used.
        */
        getUserTracks: function(jamClient) {
            var localMusicTracks = [];
            var i;

            localMusicTracks = context.JK.TrackHelpers.getTracks(jamClient, 2);

            var trackObjects = [];

            for (i=0; i < localMusicTracks.length; i++) {
                var track = {};
                track.client_track_id = localMusicTracks[i].id;
                track.instrument_id = context.JK.client_to_server_instrument_map[localMusicTracks[i].instrument_id].server_id;
                if (localMusicTracks[i].stereo) {
                    track.sound = "stereo";
                }
                else {
                    track.sound = "mono";
                }
                trackObjects.push(track);
            }
            return trackObjects;
        }
    };

})(window, jQuery);