#!/usr/bin/gjs

imports.gi.versions.Gtk = '3.0';

const Gtk = imports.gi.Gtk;

// We start out with 0 cookies

var cookies = 0;

class GettingTheSignal {

    // Create the application itself

    constructor() {

        this.application = new Gtk.Application();

        // Connect 'activate' and 'startup' signals to the callback functions

        this.application.connect('activate', this._onActivate.bind(this));

        this.application.connect('startup', this._onStartup.bind(this));

    }

    // Callback function for 'activate' signal presents window when active

    _onActivate() {

        this._window.present();

    }

    // Callback function for 'startup' signal builds the UI

    _onStartup() {

        this._buildUI();

    }

    // Build the application's UI

    _buildUI() {

        // Create the application window

        this._window = new Gtk.ApplicationWindow({

            application: this.application,

            window_position: Gtk.WindowPosition.CENTER,

            default_height: 200,

            default_width: 400,

            border_width: 20,

            title: "Spell 'cookie' to get a cookie!"});

        // Create the text entry field

        this._spellCookie = new Gtk.Entry ();

        // Create the cookie button

        this._cookieButton = new Gtk.Button ({

            label: "Get a cookie" });

        // Connect the cookie button to the function that handles clicking it

        this._cookieButton.connect ('clicked', this._getACookie.bind(this));

        // Create the label

        this._cookieLabel = new Gtk.Label ({

            label: "Number of cookies: " + cookies });

        // Create a grid to arrange everything inside

        this._grid = new Gtk.Grid ({

            halign: Gtk.Align.CENTER,

            valign: Gtk.Align.CENTER,

            row_spacing: 20 });

        // Put everything inside the grid

        this._grid.attach (this._spellCookie, 0, 0, 1, 1);

        this._grid.attach (this._cookieButton, 0, 1, 1, 1);

        this._grid.attach (this._cookieLabel, 0, 2, 1, 1);

        // Add the grid to the window

        this._window.add (this._grid);

        // Show the window and all child widgets

        this._window.show_all();

    }

    _getACookie() {

        // Did you spell "cookie" correctly?

        if ((this._spellCookie.get_text()).toLowerCase() == "cookie") {

            // Increase the number of cookies by 1 and update the label

            cookies++;

            this._cookieLabel.set_label ("Number of cookies: " + cookies);

        }

    }

};

// Run the application

let app = new GettingTheSignal ();

app.application.run (ARGV);