/* -*- mode: js2; js2-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil -*- */

const Clutter = imports.gi.Clutter;
const Mainloop = imports.mainloop;
const Meta = imports.gi.Meta;
const Shell = imports.gi.Shell;
const Tidy = imports.gi.Tidy;

const Button = imports.ui.button;
const Main = imports.ui.main;

const PANEL_HEIGHT = 32;
const TRAY_HEIGHT = 24;
const PANEL_BACKGROUND_COLOR = new Clutter.Color();
PANEL_BACKGROUND_COLOR.from_pixel(0xeeddccff);
const PRESSED_BUTTON_BACKGROUND_COLOR = new Clutter.Color();
PRESSED_BUTTON_BACKGROUND_COLOR.from_pixel(0xccbbaaff);

function Panel() {
    this._init();
}

Panel.prototype = {
        _init : function() {
    let global = Shell.Global.get();

    this._group = new Clutter.Group();

    let background = new Clutter.Rectangle({ color: PANEL_BACKGROUND_COLOR,
        reactive: true,
        width: global.screen_width+2,
        height: PANEL_HEIGHT+1,
        border_width: 1});
    background.set_position(-1, -1);
    this._group.add_actor(background);

    this.button = new Button.Button("Activities", PANEL_BACKGROUND_COLOR, PRESSED_BUTTON_BACKGROUND_COLOR, true, null, PANEL_HEIGHT-1);

    this._group.add_actor(this.button.button);

    this._grid = new Tidy.Grid({ height: TRAY_HEIGHT,
        valign: 0.5,
        end_align: true,
        column_gap: 2 })
    this._group.add_actor(this._grid);

    this._clock = new Clutter.Label({ font_name: "Sans Bold 16px",
        text: "" });
    this._grid.add_actor(this._clock);

    // Setting the anchor point at top right (north east) makes that portion of the
    // grid positioned at the position specified below.
    this._grid.set_anchor_point_from_gravity(Clutter.Gravity.NORTH_EAST);
    this._grid.set_position(global.screen_width - 2, (PANEL_HEIGHT - TRAY_HEIGHT) / 2);

    this._traymanager = new Shell.TrayManager({ bg_color: PANEL_BACKGROUND_COLOR });
    let me = this;
    // the anchor point needs to be updated each time the height/width of the content might have changed, because
    // it doesn't get updated on its own
    this._traymanager.connect('tray-icon-added',
            function(o, icon) {
        me._grid.add_actor(icon);
        /* bump the clock back to the end */
        me._grid.remove_actor(me._clock);
        me._grid.add_actor(me._clock);
        me._grid.move_anchor_point_from_gravity(Clutter.Gravity.NORTH_EAST);
    });
    this._traymanager.connect('tray-icon-removed',
            function(o, icon) {
        me._grid.remove_actor(icon);
        me._grid.move_anchor_point_from_gravity(Clutter.Gravity.NORTH_EAST);
    });
    this._traymanager.manage_stage(global.stage);

    // TODO: decide what to do with the rest of the panel in the overlay mode (make it fade-out, become non-reactive, etc.)
    // We get into the overlay mode on button-press-event as opposed to button-release-event because eventually we'll probably
    // have the overlay act like a menu that allows the user to release the mouse on the activity the user wants
    // to switch to.
    this.button.button.connect('button-press-event',
            function(o, event) {
        if (Main.overlay.visible)
            Main.hide_overlay();
        else
            Main.show_overlay();

        return true;
    });

    this._setStruts();
    global.screen.connect('notify::n-workspaces',
            function() {
        me._setStruts();
    });

    global.stage.add_actor(this._group);

    this._updateClock();
    this._startClock();
},

// Struts determine the area along each side of the screen that is reserved
// and not available to applications
_setStruts: function() {
    let global = Shell.Global.get();

    let struts = [
                  new Meta.Strut({
                      rect: {
                      x: 0,
                      y: 0,
                      width: global.screen_width,
                      height: PANEL_HEIGHT
                  },
                  side: Meta.Direction.TOP
                  })
                  ];

    let screen = global.screen;
    for (let i = 0; i < screen.n_workspaces; i++) {
        let workspace = screen.get_workspace_by_index(i);
        workspace.set_builtin_struts(struts);
    }
},

_startClock: function() {
    let me = this;
    // TODO: this makes the clock updated every 60 seconds, but not necessarily on the minute, so it is inaccurate
    Mainloop.timeout_add_seconds(60,
            function() {
        me._updateClock();
        return true;
    });
},

_updateClock: function() {
    this._clock.set_text(new Date().toLocaleFormat("%H:%M"));
    return true;
},

overlayHidden: function() {
    this.button.release();
}
};