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

const Signals = imports.signals;
const Clutter = imports.gi.Clutter;
const Gio = imports.gi.Gio;
const Pango = imports.gi.Pango;
const Gtk = imports.gi.Gtk;

const Tidy = imports.gi.Tidy;
const Big = imports.gi.Big;
const Meta = imports.gi.Meta;
const Shell = imports.gi.Shell;

// TODO - move this into GConf once we're not a plugin anymore
// but have taken over metacity
// This list is taken from GNOME Online popular applications
// http://online.gnome.org/applications
// but with nautilus removed
const DEFAULT_APPLICATIONS = [
    'mozilla-firefox.desktop',
    'gnome-terminal.desktop',
    'evolution.desktop',
    'evince.desktop',
    'gedit.desktop',
    'mozilla-thunderbird.desktop',
    'totem.desktop',
    'gnome-file-roller.desktop',
    'rhythmbox.desktop',
    'epiphany.desktop',
    'xchat.desktop',
    'openoffice.org-1.9-writer.desktop',
    'emacs.desktop',
    'gnome-system-monitor.desktop',
    'openoffice.org-1.9-calc.desktop',
    'eclipse.desktop',
    'openoffice.org-1.9-impress.desktop',
    'vncviewer.desktop'
];

const APPDISPLAY_NAME_COLOR = new Clutter.Color();
APPDISPLAY_NAME_COLOR.from_pixel(0xffffffff);
const APPDISPLAY_COMMENT_COLOR = new Clutter.Color();
APPDISPLAY_COMMENT_COLOR.from_pixel(0xffffffbb);
const APPDISPLAY_BACKGROUND_COLOR = new Clutter.Color();
APPDISPLAY_BACKGROUND_COLOR.from_pixel(0x000000ff);
const APPDISPLAY_SELECTED_BACKGROUND_COLOR = new Clutter.Color();
APPDISPLAY_SELECTED_BACKGROUND_COLOR.from_pixel(0x00ff0055);

const APPDISPLAY_HEIGHT = 50;
const APPDISPLAY_PADDING = 4;

function AppDisplayItem(node, width) {
    this._init(node, width);
}

AppDisplayItem.prototype = {
    _init: function(appInfo, width) {
        let me = this;
        this._appInfo = appInfo;

        let name = appInfo.get_name();

        let iconTheme = Gtk.IconTheme.get_default();

        this._group = new Clutter.Group({reactive: true,
                                         width: width,
                                         height: APPDISPLAY_HEIGHT});
        this._group.connect('button-press-event', function(group, e) {
            me.emit('activate');
            return true;
        });
        this._bg = new Big.Box({ background_color: APPDISPLAY_BACKGROUND_COLOR,
                                 corner_radius: 4,
                                 x: 0, y: 0,
                                 width: width, height: APPDISPLAY_HEIGHT });
        this._group.add_actor(this._bg);

        this._icon = new Clutter.Texture({ width: 48, height: 48, x: 0, y: 0 });
        let gicon = appInfo.get_icon();
        let path = null;
        if (gicon != null) {
            let iconinfo = iconTheme.lookup_by_gicon(gicon, 48, Gtk.IconLookupFlags.NO_SVG);
            if (iconinfo)
                path = iconinfo.get_filename();
        }

        if (path)
            this._icon.set_from_file(path);
        this._group.add_actor(this._icon);

        let comment = appInfo.get_description();
        let text_width = width - (me._icon.width + 4);
        this._name = new Clutter.Label({ color: APPDISPLAY_NAME_COLOR,
                                     font_name: "Sans 14px",
                                     width: text_width,
                                     ellipsize: Pango.EllipsizeMode.END,
                                     text: name,
                                     x: this._icon.width + 4,
                                     y: 0});
        this._group.add_actor(this._name);
        this._comment = new Clutter.Label({ color: APPDISPLAY_COMMENT_COLOR,
                                             font_name: "Sans 12px",
                                             width: text_width,
                                             ellipsize: Pango.EllipsizeMode.END,
                                             text: comment,
                                             x: this._name.x,
                                             y: this._name.height + 4})
        this._group.add_actor(this._comment);
        this.actor = this._group;
    },
    launch: function() {
        this._appInfo.launch([], null);
    },
    appInfo: function () {
        return this._appInfo;
    },
    markSelected: function(isSelected) {
       let color;
       if (isSelected)
           color = APPDISPLAY_SELECTED_BACKGROUND_COLOR;
       else
           color = APPDISPLAY_BACKGROUND_COLOR;
       this._bg.background_color = color;
    }
};

Signals.addSignalMethods(AppDisplayItem.prototype);

function AppDisplay(width, height) {
    this._init(width, height);
}

AppDisplay.prototype = {
    _init : function(width, height) {
        let me = this;
        let global = Shell.Global.get();
        this._search = '';
        this._width = width;
        this._height = height;
        this._appMonitor = new Shell.AppMonitor();
        this._appsStale = true;
        this._appMonitor.connect('changed', function(mon) {
            me._appsStale = true;
        });
        this._grid = new Tidy.Grid({width: width, height: height});
        this._appSet = {}; // Map<appId, appInfo>
        this._displayed = {}; // Map<appId, AppDisplay>
        this._selectedIndex = -1;
        this._maxItems = this._height / (APPDISPLAY_HEIGHT + APPDISPLAY_PADDING);
        this.actor = this._grid;
    },

    _refreshCache: function() {
        let me = this;

        if (!this._appsStale)
            return;
        for (id in this._displayed)
            this._displayed[id].destroy();
        this._appSet = {};
        this._displayed = {};
        this._selectedIndex = -1;
        let apps = Gio.app_info_get_all();
        for (let i = 0; i < apps.length; i++) {
            let appInfo = apps[i];
            let appId = appInfo.get_id();
            this._appSet[appId] = appInfo;
        }
        this._appsStale = false;
    },

    _removeItem: function(appId) {
        let item = this._displayed[appId];
        let group = item.actor;
        group.destroy();
        delete this._displayed[appId];
    },

    _removeAll: function() {
        for (appId in this._displayed)
            this._removeItem(appId);
     },

    _setDefaultList: function() {
        this._removeAll();
        let added = 0;
        for (let i = 0; i < DEFAULT_APPLICATIONS.length && added < this._maxItems; i++) {
            let appId = DEFAULT_APPLICATIONS[i];
            let appInfo = this._appSet[appId];
            if (appInfo) {
              this._filterAdd(appId);
              added += 1;
            }
        }
    },

    _getNDisplayed: function() {
        // Is there a better way to do .size() ?
        let c = 0; for (i in this._displayed) { c += 1; };
        return c;
    },

    _filterAdd: function(appId) {
        let me = this;

        let appInfo = this._appSet[appId];

        let appDisplayItem = new AppDisplayItem(appInfo, this._width);
        appDisplayItem.connect('activate', function() {
            appDisplayItem.launch();
            me.emit('activated');
        });
        let group = appDisplayItem.actor;
        this._grid.add_actor(group);
        this._displayed[appId] = appDisplayItem;
    },

    _filterRemove: function(appId) {
        // In the future, do some sort of fade out or other effect here
        let item = this._displayed[appId];
        this._removeItem(item);
    },

    _appInfoMatches: function(appInfo, search) {
        if (search == null || search == '')
            return true;
        let name = appInfo.get_name().toLowerCase();
        if (name.indexOf(search) >= 0)
            return true;
        let description = appInfo.get_description();
        if (description) {
            description = description.toLowerCase();
            if (description.indexOf(search) >= 0)
                return true;
        }
        let exec = appInfo.get_executable().toLowerCase();
        if (exec.indexOf(search) >= 0)
            return true;
        return false;
    },

    _sortApps: function(appIds) {
        let me = this;
        return appIds.sort(function (a,b) {
            let appA = me._appSet[a];
            let appB = me._appSet[b];
            return appA.get_name().localeCompare(appB.get_name());
        });
    },

    _doSearchFilter: function() {
        this._removeAll();
        let matchedApps = [];
        for (appId in this._appSet) {
            if (matchedApps.length >= this._maxItems)
                break;
            if (this._displayed[appId])
                continue;
            let app = this._appSet[appId];
            if (this._appInfoMatches(app, this._search))
                matchedApps.push(appId);
        }
        this._sortApps(matchedApps);
        for (let i = 0; i < matchedApps.length; i++) {
            this._filterAdd(matchedApps[i]);
        }
    },

    _redisplay: function() {
        this._refreshCache();
        if (!this._search)
            this._setDefaultList();
        else
            this._doSearchFilter();
    },

    setSearch: function(text) {
        this._search = text.toLowerCase();
        this._redisplay();
    },

    _findDisplayedByIndex: function(index) {
        let displayedActors = this._grid.get_children();
        let actor = displayedActors[index];
        return this._findDisplayedByActor(actor);
    },

    _findDisplayedByActor: function(actor) {
        for (appId in this._displayed) {
            let item = this._displayed[appId];
            if (item.actor == actor) {
                return item;
            }
        }
        return null;
    },

    searchActivate: function() {
        if (this._selectedIndex != -1) {
            let selected = this._findDisplayedByIndex(this._selectedIndex);
            selected.launch();
            this.emit('activated');
            return;
        }
        let displayedActors = this._grid.get_children();
        if (displayedActors.length != 1)
            return;
        let selectedActor = displayedActors[0];
        let selectedMenuItem = this._findDisplayedByActor(selectedActor);
        selectedMenuItem.launch();
        this.emit('activated');
    },

    _selectIndex: function(index) {
        if (this._selectedIndex != -1) {
            let prev = this._findDisplayedByIndex(this._selectedIndex);
            prev.markSelected(false);
        }
        this._selectedIndex = index;
        let item = this._findDisplayedByIndex(index);
        item.markSelected(true);
    },

    selectUp: function() {
        let prev = this._selectedIndex-1;
        if (prev < 0)
            return;
        this._selectIndex(prev);
    },

    selectDown: function() {
        let next = this._selectedIndex+1;
        let nDisplayed = this._getNDisplayed();
        if (next >= nDisplayed)
            return;
        this._selectIndex(next);
    },

    show: function() {
        this._redisplay();
        this._grid.show();
    },

    hide: function() {
        this._grid.hide();
    }
};

Signals.addSignalMethods(AppDisplay.prototype);