<?xml version="1.0" encoding="UTF-8"?>
<MetaInformation>
   <Attribute id="Package:ID" value="bounce.track.to.mono"/>
</MetaInformation>

<?xml version="1.0" encoding="UTF-8"?>
<ClassFactory>
   <ScriptClass
      classID="{269D9BA0-E759-4D8C-8B86-AF24D4F0A1D8}"
      category="EditTask"
      subCategory="TrackEdit"
      name="Bounce Track to Mono"
      sourceFile="bounceTrackToMono.js"
      functionName="createInstance"
      metaClassID="{D6BF554D-D36C-4786-B8C7-1DFC70B191B2}">
      <Attribute id="menuPriority" value="-1"/>
   </ScriptClass>
</ClassFactory>

function bounceTrackToMono()
{
   this.interfaces = [Host.Interfaces.IEditTask]   

   // -------------------------------------------

   this.prepareEdit = function (context)
   {return Host.Results.kResultOk;}
   
   // -------------------------------------------
   
   this.performEdit = function (context)
   {
      // command action code shortcut
      let cmd = Host.GUI.Commands;

      // get the selected channel
      let channel = context.mainTrackList
         .getSelectedTrack(0).channel;

      /* if there is no audio channel or if it's
         not from an audio track do nothing */
      if (channel == undefined || 
         channel.mediaType != "Audio")
      {return}

      // get the channel mode switch param
      let mode = channel.findParameter("stereo")

      /* all audio track channels have a mode 
         switch so this is likely an unnecessary  
         error trap, but just in case ...  */
      if (mode == undefined) {return}
      
      // hold the initial channel mode state
      let initState = mode.value;

      // if the track mode is already mono, prompt
      if (mode.value == 0)
      {
         if( Host.GUI.ask("This track channel is already set to mono.\n" +
            "Do you want to bounce the events to mono anyway?\n\n" + 
            "This will not apply event gain compensation.")
            == Host.GUI.Constants.kNo)
         {return}
      }

      // set to mono if not already
      mode.setValue(0, true)

      /* clear all selections to not accidentally bounce
         other media on other tracks that may also be 
         selected, and select all media on the current track  */
      cmd.interpretCommand("Edit", "Deselect All")
      cmd.interpretCommand("Edit", "Select All on Tracks")
      
      /* only reduce event gain to compensate for the mono 
         summing if the initial state was stereo, otherwise
         it's assumed the gain was already compensated for
         elsewhere in the song or mix or plugins  */
      if (initState == "1")
      {
         cmd.interpretCommand("Audio", "Edit Volume", false,
            Host.Attributes(["Level", "-6", "Relative", "1"]))
      }

      // consolidate events to mono with no snapping / resizing
      cmd.interpretCommand("Event", "Bounce Selection", false,
         Host.Attributes(["Snap", "0"]))
         
      return Host.Results.kResultOk;
   }
}

/////////////////////////////////////////////////////////////////////

function createInstance ()
{
   return new bounceTrackToMono ();
}