#!/usr/bin/gjs

var Gtk = imports.gi.Gtk;

var Gst = imports.gi.Gst;

const Mainloop = imports.mainloop;

Gtk.init(null, 0);

Gst.init(null, 0);

var guitarwindow = new Gtk.Window({type: Gtk.WindowType.TOPLEVEL, border_width: 100});

guitarwindow.title = "Guitar Tuner";

guitarwindow.connect("destroy", function(){Gtk.main_quit()});

var guitar_box = new Gtk.ButtonBox ({orientation: Gtk.Orientation.VERTICAL, spacing: 10});

var E = new Gtk.Button({label: "E"});

var A = new Gtk.Button({label: "A"});

var D = new Gtk.Button({label: "D"});

var G = new Gtk.Button({label: "G"});

var B = new Gtk.Button({label: "B"});

var e = new Gtk.Button({label: "e"});

var frequencies = {E: 329.63, A: 440,	D: 587.33,	G: 783.99,	B: 987.77,	e: 1318.5}

function playSound(frequency){

  var pipeline = new Gst.Pipeline({name: "note"});

  var source = Gst.ElementFactory.make("audiotestsrc","source");

  var sink = Gst.ElementFactory.make("autoaudiosink","output");

  source.set_property('freq', frequency);

  pipeline.add(source);

  pipeline.add(sink);

  source.link(sink);

  pipeline.set_state(Gst.State.PLAYING);

  Mainloop.timeout_add(500, function () { 

    pipeline.set_state(Gst.State.NULL);

	  return false;

});	

}

E.connect("clicked", function() {

  playSound(frequencies.E);

});

A.connect("clicked", function(){

  playSound(frequencies.A);

});

D.connect("clicked", function(){

  playSound(frequencies.D);

});

G.connect("clicked", function(){

  playSound(frequencies.G);

});

B.connect("clicked", function(){

  playSound(frequencies.B);

});

e.connect("clicked", function(){

  playSound(frequencies.e);

});

guitar_box.add(E);

guitar_box.add(A);

guitar_box.add(D);

guitar_box.add(G);

guitar_box.add(B);

guitar_box.add(e);

guitarwindow.add(guitar_box);

guitar_box.show_all();

guitarwindow.show();

Gtk.main();