(function (context, $) {

  "use strict";

  context.JK = context.JK || {};
  context.JK.ConfigureTracksHelper2 = function (app) {
    var logger = context.JK.logger;
    var ASSIGNMENT = context.JK.ASSIGNMENT;
    var VOICE_CHAT = context.JK.VOICE_CHAT;
    var MAX_TRACKS = context.JK.MAX_TRACKS;
    var MAX_OUTPUTS = context.JK.MAX_OUTPUTS;
    var gearUtils = context.JK.GearUtils;

    var $parent                   = null;
    var $templateAssignablePort   = null;
    var $templateTrackTarget      = null;
    var $templateOutputTarget     = null;
    var $unassignedInputsHolder   = null;
    var $unassignedOutputsHolder  = null;
    var $tracksHolder             = null;
    var $outputChannelHolder      = null;
    var $instrumentsHolder        = null;
    var isDragging                = false;



    // inputChannelFilter is an optional argument that is used by the Gear Wizard.
    // basically, if an input channel isn't in there, it's not going to be displayed
    function loadChannels(forceInputsToUnassign, inputChannelFilter) {
      var musicPorts = jamClient.FTUEGetChannels();

      $unassignedInputsHolder.empty();
      $unassignedOutputsHolder.empty();

      var inputChannels = musicPorts.inputs;
      var outputChannels = musicPorts.outputs;

      // uncomment to add a bunch of bogus channels
      //inputChannels = inputChannels.concat(inputChannels.concat(inputChannels.concat(inputChannels)))

      context._.each(inputChannels, function (inputChannel) {

        if(inputChannelFilter && !(inputChannelFilter.indexOf(inputChannel.id) > -1)) {
          // skipping input channel because it's not in the filter
          return;
        }

        var $channel = $(context._.template($templateAssignablePort.html(), $.extend({}, inputChannel, {direction:'in'}), { variable: 'data' }));

        if(forceInputsToUnassign || inputChannel.assignment == ASSIGNMENT.UNASSIGNED) {
          unassignInputChannel($channel);
        }
        else if(inputChannel.assignment == ASSIGNMENT.CHAT) {
          // well, we can't show it as unused... if there were a place to show chat inputs, we would put it there.
          // but we don't have it, so just skip
          logger.debug("skipping chat channel ", inputChannel)
          return;
        }
        else {
          // find the track this belongs in

          var trackNumber = inputChannel.assignment - 1;

          // plop down a track holder on the UI

          addChannelToTrack($channel, trackNumber);
        }
      })

      var outputAssignment = 0;
      context._.each(outputChannels, function (outputChannel, index) {
        var $channel = $(context._.template($templateAssignablePort.html(), $.extend({}, outputChannel, {direction:'out'}), { variable: 'data' }));



        if(outputChannel.assignment == ASSIGNMENT.UNASSIGNED) {
          unassignOutputChannel($channel);
        }
        else {
          var $output = $outputChannelHolder.find('.output[data-num="' + outputAssignment + '"]');
          outputAssignment++;

          if($output.length == 0) {
            context.JK.alertSupportedNeeded('Unable to find an output holder for channel: ' + outputChannel.id + ' with assignment ' + outputChannel.assignment);
            return false;
          }
          addChannelToOutput($channel, $output.find('.output-target'));
        }
      });
    }

    // iterates through the dom and returns a pure data structure for track associations and output channels
    function getCurrentState() {

      var state = {};
      state.tracks = [];
      state.unassignedChannels = [];
      state.outputs = [];
      var $unassignedInputChannels = $unassignedInputsHolder.find('.ftue-input');
      var $unassignedOutputChannels = $unassignedOutputsHolder.find('.ftue-input');
      var $tracks = $tracksHolder.find('.track-target');
      var $outputs = $outputChannelHolder.find('.output-target');

      context._.each($unassignedInputChannels, function($unassignedInput) {
        $unassignedInput = $($unassignedInput);
        var channelId = $unassignedInput.attr('data-input-id');
        state.unassignedChannels.push(channelId);
      })

      context._.each($unassignedOutputChannels, function($unassignedOutput) {
        $unassignedOutput = $($unassignedOutput);
        var channelId = $unassignedOutput.attr('data-input-id');
        state.unassignedChannels.push(channelId);
      })

      context._.each($tracks, function($track, index) {
        $track = $($track);
        var $assignedChannels = $track.find('.ftue-input');

        var track = {index: index, channels:[]};
        context._.each($assignedChannels, function($assignedChannel) {
          $assignedChannel = $($assignedChannel);
          track.channels.push($assignedChannel.attr('data-input-id'))
        });

        // sparse array
        if(track.channels.length > 0) {
          state.tracks.push(track);
        }
        var $instrument = $instrumentsHolder.find('[data-num="' + index + '"]').find('.icon-instrument-select');
        track.instrument_id = $instrument.data('instrument_id');
      })

      context._.each($outputs, function($output, index) {
        $output = $($output);
        var $assignedChannel = $output.find('.ftue-input');

        // this is overkill since there should only be 1 or 0 .ftue-inputs in a given .output
        var outputSlot = {index: index, channels:[]};
        context._.each($assignedChannel, function($assignedChannel) {
          $assignedChannel = $($assignedChannel);
          outputSlot.channels.push($assignedChannel.attr('data-input-id'))
        });

        // sparse array
        if(outputSlot.channels.length > 0) {
          state.outputs.push(outputSlot);
        }
      })
      return state;
    }

    function validate(tracks) {
      // there must be at least one assigned channel
      if(tracks.tracks.length == 0) {
        logger.debug("ConfigureTracks validation error: must have assigned at least one input port to a track.");
        context.JK.Banner.showAlert('Must have assigned at least one input port to a track.');
        return false;
      }

      // there must be some instruments
      context._.each(tracks.tracks, function(track) {
        if(!track.instrument_id) {
          logger.debug("ConfigureTracks validation error: all tracks with ports assigned must specify an instrument.");
          context.JK.Banner.showAlert('Please use the instrument icons to choose what you plan to play on each track.');
          return false;
        }
      });

      // there must be exactly 2 output channels assigned
      if(tracks.outputs.length != 2 || (tracks.outputs[0].channels.length != 1 && track.outputs[1].channels.length != 1)) {
        logger.debug("ConfigureTracks validation error: must have assigned exactly two output ports");
        context.JK.Banner.showAlert('Must have assigned exactly 2 output ports.');
        return false;
      }

      return true;
    }

    function save(state) {

      context._.each(state.unassignedChannels, function(unassignedChannelId) {
        context.jamClient.TrackSetAssignment(unassignedChannelId, true, ASSIGNMENT.UNASSIGNED);
      });

      // save input/tracks
      context._.each(state.tracks, function(track, index) {

        var trackNumber = index + 1;

        context._.each(track.channels, function(channelId) {
          context.jamClient.TrackSetAssignment(channelId, true, trackNumber);

        });
        logger.debug("context.jamClient.TrackSetInstrument(trackNumber, track.instrument_id)", trackNumber, track.instrument_id);
        context.jamClient.TrackSetInstrument(trackNumber, context.JK.instrument_id_to_instrument[track.instrument_id].client_id);
      });

      // save outputs
      context._.each(state.outputs, function(output, index) {
        context._.each(output.channels, function(channelId) {
          context.jamClient.TrackSetAssignment(channelId, true, ASSIGNMENT.OUTPUT);
        });
      });

      var result = context.jamClient.TrackSaveAssignments();

      if(!result || result.length == 0) {
        // success
        return true;
      }
      else {
        context.JK.Banner.showAlert('Unable to save assignments. ' + result);
        return false;
      }
    }

    function loadTrackInstruments(forceInputsToUnassign) {
      var $trackInstruments = $instrumentsHolder.find('.track-instrument');

      context._.each($trackInstruments, function(trackInstrument) {
        var $trackInstrument = $(trackInstrument);

        var trackIndex = parseInt($trackInstrument.attr('data-num')) + 1;

        var clientInstrument = context.jamClient.TrackGetInstrument(trackIndex);

        var instrument = context.JK.client_to_server_instrument_map[clientInstrument];

        $trackInstrument.instrumentSelectorSet(instrument ? instrument.server_id : instrument);
      });
    }

    function trySave() {
      var state = getCurrentState();

      if(!validate(state)) {
        return false;
      }

      var saved = save(state);

      if(saved) {
        context.JK.GA.trackConfigureTracksCompletion(context.JK.detectOS());
      }

      return saved;
    }

    function reset(forceInputsToUnassign, inputChannelFilter) {
      loadChannels(forceInputsToUnassign, inputChannelFilter);
      loadTrackInstruments(forceInputsToUnassign);
    }

    function unassignOutputChannel($channel) {
      var $originallyAssignedTrack = $channel.closest('.output-target');
      $unassignedOutputsHolder.append($channel);
      $originallyAssignedTrack.attr('output-count', $originallyAssignedTrack.find('.ftue-input:not(.ui-draggable-dragging)').length);
    }

    function unassignInputChannel($channel) {
      var $originallyAssignedTrack = $channel.closest('.track-target');
      $unassignedInputsHolder.append($channel);
      $originallyAssignedTrack.attr('track-count', $originallyAssignedTrack.find('.ftue-input:not(.ui-draggable-dragging)').length);

    }

    function addChannelToTrack($channel, $track) {
      var $originallyAssignedTrack = $channel.closest('.track-target');
      $track.append($channel);
      $track.attr('track-count', $track.find('.ftue-input:not(.ui-draggable-dragging)').length);
      $originallyAssignedTrack.attr('track-count', $originallyAssignedTrack.find('.ftue-input:not(.ui-draggable-dragging)').length)
    }

    function addChannelToOutput($channel, $slot) {
      var $originallyAssignedTrack = $channel.closest('.output-target');
      $slot.append($channel);
      $slot.attr('output-count', $slot.find('.ftue-input:not(.ui-draggable-dragging)').length);
      $originallyAssignedTrack.attr('output-count', $originallyAssignedTrack.find('.ftue-input:not(.ui-draggable-dragging)').length)
    }

    function initialize(_$parent) {
      $parent = _$parent;

    }

    this.initialize = initialize;
    this.trySave = trySave;
    this.reset = reset;

    return this;
  };

})(window, jQuery);