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

const Signals = imports.signals;
const Mainloop = imports.mainloop;
const Tweener = imports.tweener.tweener;
const Clutter = imports.gi.Clutter;
const Gio = imports.gi.Gio;
const Gtk = imports.gi.Gtk;

const Workspaces = imports.ui.workspaces;
const Main = imports.ui.main;
const Panel = imports.ui.panel;
const Shell = imports.gi.Shell;
const Big = imports.gi.Big;
const AppDisplay = imports.ui.appDisplay;
const DocDisplay = imports.ui.docDisplay;

const OVERLAY_BACKGROUND_COLOR = new Clutter.Color();
OVERLAY_BACKGROUND_COLOR.from_pixel(0x000000ff);

const SIDESHOW_PAD = 6;
const SIDESHOW_PAD_BOTTOM = 40;
const SIDESHOW_MIN_WIDTH = 250;
const SIDESHOW_SECTION_PAD = 10;
const SIDESHOW_SECTION_LABEL_PAD_BOTTOM = 6;
const SIDESHOW_SEARCH_BG_COLOR = new Clutter.Color();
SIDESHOW_SEARCH_BG_COLOR.from_pixel(0xffffffff);
const SIDESHOW_TEXT_COLOR = new Clutter.Color();
SIDESHOW_TEXT_COLOR.from_pixel(0xffffffff);

// Time for initial animation going into overlay mode
const ANIMATION_TIME = 0.5;

// How much of the screen the workspace grid takes up
const WORKSPACE_GRID_SCALE = 0.75;

// Padding around workspace grid / Spacing between Sideshow and Workspaces
const WORKSPACE_GRID_PADDING = 10;

function Sideshow(parent, width) {
    this._init(parent, width);
}

Sideshow.prototype = {
    _init : function(parent, width) {
        let me = this;

        let global = Shell.Global.get();
        this.actor = new Clutter.Group();
        parent.add_actor(this.actor);
        let icontheme = Gtk.IconTheme.get_default();
        let rect = new Big.Box({ background_color: SIDESHOW_SEARCH_BG_COLOR,
                                 corner_radius: 4,
                                 x: SIDESHOW_PAD,
                                 y: Panel.PANEL_HEIGHT + SIDESHOW_PAD,
                                 width: width,
                                 height: 24});
        this.actor.add_actor(rect);

        let searchIconTexture = new Clutter.Texture({ x: SIDESHOW_PAD + 2,
                                                      y: rect.y + 2 });
        let searchIconPath = icontheme.lookup_icon('gtk-find', 16, 0).get_filename();
        searchIconTexture.set_from_file(searchIconPath);
        this.actor.add_actor(searchIconTexture);

        // We need to initialize the text for the entry to have the cursor displayed 
        // in it. See http://bugzilla.openedhand.com/show_bug.cgi?id=1365
        this._searchEntry = new Clutter.Entry({
                                             font_name: "Sans 14px",
                                             x: searchIconTexture.x
                                                 + searchIconTexture.width + 4,
                                             y: searchIconTexture.y,
                                             width: rect.width - (searchIconTexture.x),
                                             height: searchIconTexture.height, 
                                             text: ""});
        this.actor.add_actor(this._searchEntry);
        global.stage.set_key_focus(this._searchEntry); 
        this._searchQueued = false;
        this._searchActive = false;
        this._searchEntry.connect('notify::text', function (se, prop) {
            if (me._searchQueued)
                return;
            Mainloop.timeout_add(250, function() {
                let text = me._searchEntry.text.replace(/\s/g, "");
                me._searchQueued = false;
                me._searchActive = text != '';
                me._appDisplay.setSearch(text);
                me._docDisplay.setSearch(text);
                return false;
            });
        });
        this._searchEntry.connect('activate', function (se) {
            // only one of the displays will have an item selected, so it's ok to
            // call activateSelected() on both of them
            me._appDisplay.activateSelected();
            me._docDisplay.activateSelected();
            return true;
        });
        this._searchEntry.connect('key-press-event', function (se, e) {
            let code = e.get_code();
            if (code == 9) {
                // A single escape clears the entry, two of them hides the overlay
                if (me._searchEntry.text == '')
                    me.emit('activated');
                else
                    me._searchEntry.text = '';
                return true;
            } else if (code == 111) {
                // selectUp and selectDown wrap around in their respective displays
                // too, but there doesn't seem to be any flickering if we first select 
                // something in one display, but then unset the selection, and move
                // it to the other display, so it's ok to do that.
                if (me._appDisplay.hasSelected() && !me._appDisplay.selectUp() && me._docDisplay.hasItems()) {
                    me._appDisplay.unsetSelected();
                    me._docDisplay.selectLastItem();
                } else if (me._docDisplay.hasSelected() && !me._docDisplay.selectUp() && me._appDisplay.hasItems()) {
                    me._docDisplay.unsetSelected();
                    me._appDisplay.selectLastItem();
                }
                return true;
            } else if (code == 116) {
                if (me._appDisplay.hasSelected() && !me._appDisplay.selectDown() && me._docDisplay.hasItems()) {
                    me._appDisplay.unsetSelected();
                    me._docDisplay.selectFirstItem();
                } else if (me._docDisplay.hasSelected() && !me._docDisplay.selectDown() && me._appDisplay.hasItems()) {
                    me._docDisplay.unsetSelected();
                    me._appDisplay.selectFirstItem();
                }
                return true;
            }
            return false;
        });

        let appsText = new Clutter.Label({ color: SIDESHOW_TEXT_COLOR,
                                           font_name: "Sans Bold 14px",
                                           text: "Applications",
                                           x: SIDESHOW_PAD,
                                           y: this._searchEntry.y + this._searchEntry.height + SIDESHOW_SECTION_PAD,
                                           height: 16});
        this.actor.add_actor(appsText);

        let sectionLabelHeight = appsText.height + SIDESHOW_SECTION_LABEL_PAD_BOTTOM
        let menuY = appsText.y + sectionLabelHeight;

        let itemDisplayHeight = global.screen_height - menuY - SIDESHOW_SECTION_PAD - sectionLabelHeight - SIDESHOW_PAD_BOTTOM;
        this._appDisplay = new AppDisplay.AppDisplay(width, itemDisplayHeight / 2);
        this._appDisplay.actor.x = SIDESHOW_PAD;
        this._appDisplay.actor.y = menuY;
        this.actor.add_actor(this._appDisplay.actor);

        let docsText = new Clutter.Label({ color: SIDESHOW_TEXT_COLOR,
                                           font_name: "Sans Bold 14px",
                                           text: "Recent Documents",
                                           x: SIDESHOW_PAD,
                                           y: menuY + (itemDisplayHeight / 2) + SIDESHOW_SECTION_PAD,
                                           height: 16});
        this.actor.add_actor(docsText);

        this._docDisplay = new DocDisplay.DocDisplay(width, itemDisplayHeight / 2);
        this._docDisplay.actor.x = SIDESHOW_PAD;
        this._docDisplay.actor.y = docsText.y + docsText.height + 6;
        this.actor.add_actor(this._docDisplay.actor);

        /* Proxy the activated signals */
        this._appDisplay.connect('activated', function(appDisplay) {
            me._searchEntry.text = '';
            // we allow clicking on an item to launch it, and this unsets the selection
            // so that we can move it to the item that was clicked on
            me._appDisplay.unsetSelected(); 
            me._docDisplay.unsetSelected();
            me._appDisplay.doActivate();
            me.emit('activated');
        });
        this._docDisplay.connect('activated', function(docDisplay) {
            me._searchEntry.text = '';
            // we allow clicking on an item to launch it, and this unsets the selection
            // so that we can move it to the item that was clicked on
            me._appDisplay.unsetSelected(); 
            me._docDisplay.unsetSelected();
            me._docDisplay.doActivate();
            me.emit('activated');
        });
        this._appDisplay.connect('redisplayed', function(appDisplay) {
            // This can be applicable if app display previously had the selection,
            // but it got updated and now has no items, so we can try to move
            // the selection to the doc display. 
            if (!me._appDisplay.hasSelected() && !me._docDisplay.hasSelected())
                me._docDisplay.selectFirstItem();    
        });
        this._docDisplay.connect('redisplayed', function(docDisplay) {
            if (!me._docDisplay.hasSelected() && !me._appDisplay.hasSelected())
                me._appDisplay.selectFirstItem();
        });
    },

    show: function() {
        this._appDisplay.selectFirstItem();   
        if (!this._appDisplay.hasSelected())
            this._docDisplay.selectFirstItem();
        else
            this._docDisplay.unsetSelected();
        this._appDisplay.show(); 
        this._docDisplay.show();
    },

    hide: function() {
    }
};
Signals.addSignalMethods(Sideshow.prototype);

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

Overlay.prototype = {
    _init : function() {
        let me = this;

        let global = Shell.Global.get();

        this._group = new Clutter.Group();
        this.visible = false;

        let background = new Clutter.Rectangle({ color: OVERLAY_BACKGROUND_COLOR,
                                                 reactive: true,
                                                 x: 0,
                                                 y: Panel.PANEL_HEIGHT,
                                                 width: global.screen_width,
                                                 height: global.screen_width - Panel.PANEL_HEIGHT });
        this._group.add_actor(background);

        this._group.hide();
        global.overlay_group.add_actor(this._group);

        // TODO - recalculate everything when desktop size changes
        let screenWidth = global.screen_width;
        let sideshowWidth = screenWidth - (screenWidth * WORKSPACE_GRID_SCALE) -
            2 * WORKSPACE_GRID_PADDING;
        this._sideshow = new Sideshow(this._group, sideshowWidth);
        this._sideshow.connect('activated', function(sideshow) {
            // TODO - have some sort of animation/effect while
            // transitioning to the new app.  We definitely need
            // startup-notification integration at least.
            me._deactivate();
        });
    },

    show : function() {
        if (this.visible)
            return;

        this.visible = true;

        let global = Shell.Global.get();

        this._sideshow.show();

        this._workspaces = new Workspaces.Workspaces();
        this._group.add_actor(this._workspaces.actor);
        this._workspaces.actor.raise_top();

        // All the the actors in the window group are completely obscured,
        // hiding the group holding them while the overlay is displayed greatly
        // increases performance of the overlay especially when there are many
        // windows visible.
        //
        // If we switched to displaying the actors in the overlay rather than
        // clones of them, this would obviously no longer be necessary.
        global.window_group.hide();
        this._group.show();
    },

    hide : function() {
        if (!this.visible)
            return;

        this._workspaces.hide();

        // Dummy tween, just waiting for the workspace animation
        Tweener.addTween(this,
                         { time: ANIMATION_TIME,
                           onComplete: this._hideDone,
                           onCompleteScope: this
                         });
    },

    _hideDone: function() {
        let global = Shell.Global.get();

        this.visible = false;
        global.window_group.show();
        this._group.hide();

        this._workspaces.destroy();
        this._workspaces = null;
    },

    _deactivate : function() {
        Main.hide_overlay();
    }
};