// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-

const Gio = imports.gi.Gio;
const GLib = imports.gi.GLib;
const Lang = imports.lang;
const Meta = imports.gi.Meta;
const Shell = imports.gi.Shell;

const Config = imports.misc.config;
const ExtensionSystem = imports.ui.extensionSystem;
const ExtensionDownloader = imports.ui.extensionDownloader;
const ExtensionUtils = imports.misc.extensionUtils;
const Hash = imports.misc.hash;
const Main = imports.ui.main;
const Screenshot = imports.ui.screenshot;

const GnomeShellIface = <interface name="org.gnome.Shell">
<method name="Eval">
    <arg type="s" direction="in" name="script" />
    <arg type="b" direction="out" name="success" />
    <arg type="s" direction="out" name="result" />
</method>
<method name="GrabAccelerator">
    <arg type="s" direction="in" name="accelerator"/>
    <arg type="u" direction="in" name="flags"/>
    <arg type="u" direction="out" name="action"/>
</method>
<method name="GrabAccelerators">
    <arg type="a(su)" direction="in" name="accelerators"/>
    <arg type="au" direction="out" name="actions"/>
</method>
<method name="UngrabAccelerator">
    <arg type="u" direction="in" name="action"/>
    <arg type="b" direction="out" name="success"/>
</method>
<signal name="AcceleratorActivated">
    <arg name="action" type="u" />
    <arg name="deviceid" type="u" />
</signal>
<property name="Mode" type="s" access="read" />
<property name="OverviewActive" type="b" access="readwrite" />
<property name="ShellVersion" type="s" access="read" />
</interface>;

const ScreenSaverIface = <interface name="org.gnome.ScreenSaver">
<method name="Lock">
</method>
<method name="GetActive">
    <arg name="active" direction="out" type="b" />
</method>
<method name="SetActive">
    <arg name="value" direction="in" type="b" />
</method>
<method name="GetActiveTime">
    <arg name="value" direction="out" type="u" />
</method>
<signal name="ActiveChanged">
    <arg name="new_value" type="b" />
</signal>
</interface>;

const GnomeShell = new Lang.Class({
    Name: 'GnomeShellDBus',

    _init: function() {
        this._dbusImpl = Gio.DBusExportedObject.wrapJSObject(GnomeShellIface, this);
        this._dbusImpl.export(Gio.DBus.session, '/org/gnome/Shell');

        this._extensionsService = new GnomeShellExtensions();
        this._screenshotService = new Screenshot.ScreenshotService();

        this._grabbedAccelerators = new Hash.Map();
        this._grabbers = new Hash.Map();

        global.display.connect('accelerator-activated', Lang.bind(this,
            function(display, action, deviceid) {
                this._emitAcceleratorActivated(action, deviceid);
            }));
    },

    /**
     * Eval:
     * @code: A string containing JavaScript code
     *
     * This function executes arbitrary code in the main
     * loop, and returns a boolean success and
     * JSON representation of the object as a string.
     *
     * If evaluation completes without throwing an exception,
     * then the return value will be [true, JSON.stringify(result)].
     * If evaluation fails, then the return value will be
     * [false, JSON.stringify(exception)];
     *
     */
    Eval: function(code) {
        if (!global.settings.get_boolean('development-tools'))
            return [false, null];

        let returnValue;
        let success;
        try {
            returnValue = JSON.stringify(eval(code));
            // A hack; DBus doesn't have null/undefined
            if (returnValue == undefined)
                returnValue = '';
            success = true;
        } catch (e) {
            returnValue = JSON.stringify(e);
            success = false;
        }
        return [success, returnValue];
    },

    GrabAcceleratorAsync: function(params, invocation) {
        let [accel, flags] = params;
        let sender = invocation.get_sender();
        let bindingAction = this._grabAcceleratorForSender(accel, flags, sender);
        return invocation.return_value(GLib.Variant.new('(u)', [bindingAction]));
    },

    GrabAcceleratorsAsync: function(params, invocation) {
        let [accels] = params;
        let sender = invocation.get_sender();
        let bindingActions = [];
        for (let i = 0; i < accels.length; i++) {
            let [accel, flags] = accels[i];
            bindingActions.push(this._grabAcceleratorForSender(accel, flags, sender));
        }
        return invocation.return_value(GLib.Variant.new('(au)', [bindingActions]));
    },

    UngrabAcceleratorAsync: function(params, invocation) {
        let [action] = params;
        let grabbedBy = this._grabbedAccelerators.get(action);
        if (invocation.get_sender() != grabbedBy)
            return invocation.return_value(GLib.Variant.new('(b)', [false]));

        let ungrabSucceeded = global.display.ungrab_accelerator(action);
        if (ungrabSucceeded)
            this._grabbedAccelerators.delete(action);
        return invocation.return_value(GLib.Variant.new('(b)', [ungrabSucceeded]));
    },

    _emitAcceleratorActivated: function(action, deviceid) {
        let destination = this._grabbedAccelerators.get(action);
        if (!destination)
            return;

        let connection = this._dbusImpl.get_connection();
        let info = this._dbusImpl.get_info();
        connection.emit_signal(destination,
                               this._dbusImpl.get_object_path(),
                               info ? info.name : null,
                               'AcceleratorActivated',
                               GLib.Variant.new('(uu)', [action, deviceid]));
    },

    _grabAcceleratorForSender: function(accelerator, flags, sender) {
        let bindingAction = global.display.grab_accelerator(accelerator);
        if (bindingAction == Meta.KeyBindingAction.NONE)
            return Meta.KeyBindingAction.NONE;

        let bindingName = Meta.external_binding_name_for_action(bindingAction);
        Main.wm.allowKeybinding(bindingName, flags);

        this._grabbedAccelerators.set(bindingAction, sender);

        if (!this._grabbers.has(sender)) {
            let id = Gio.bus_watch_name(Gio.BusType.SESSION, sender, 0, null,
                                        Lang.bind(this, this._onGrabberBusNameVanished));
            this._grabbers.set(sender, id);
        }

        return bindingAction;
    },

    _ungrabAccelerator: function(action) {
        let ungrabSucceeded = global.display.ungrab_accelerator(action);
        if (ungrabSucceeded)
            this._grabbedAccelerators.delete(action);
    },

    _onGrabberBusNameVanished: function(connection, name) {
        let grabs = this._grabbedAccelerators.items();
        for (let i = 0; i < grabs.length; i++) {
            let [action, sender] = grabs[i];
            if (sender == name)
                this._ungrabAccelerator(action);
        }
        Gio.bus_unwatch_name(this._grabbers.get(name));
        this._grabbers.delete(name);
    },


    Mode: global.session_mode,

    get OverviewActive() {
        return Main.overview.visible;
    },

    set OverviewActive(visible) {
        if (visible)
            Main.overview.show();
        else
            Main.overview.hide();
    },

    ShellVersion: Config.PACKAGE_VERSION
});

const GnomeShellExtensionsIface = <interface name="org.gnome.Shell.Extensions">
<method name="ListExtensions">
    <arg type="a{sa{sv}}" direction="out" name="extensions" />
</method>
<method name="GetExtensionInfo">
    <arg type="s" direction="in" name="extension" />
    <arg type="a{sv}" direction="out" name="info" />
</method>
<method name="GetExtensionErrors">
    <arg type="s" direction="in" name="extension" />
    <arg type="as" direction="out" name="errors" />
</method>
<signal name="ExtensionStatusChanged">
    <arg type="s" name="uuid"/>
    <arg type="i" name="state"/>
    <arg type="s" name="error"/>
</signal>
<method name="InstallRemoteExtension">
    <arg type="s" direction="in" name="uuid"/>
    <arg type="s" direction="out" name="result"/>
</method>
<method name="UninstallExtension">
    <arg type="s" direction="in" name="uuid"/>
    <arg type="b" direction="out" name="success"/>
</method>
<method name="LaunchExtensionPrefs">
    <arg type="s" direction="in" name="uuid"/>
</method>
<method name="ReloadExtension">
    <arg type="s" direction="in" name="uuid"/>
</method>
<method name="CheckForUpdates">
</method>
<property name="ShellVersion" type="s" access="read" />
</interface>;

const GnomeShellExtensions = new Lang.Class({
    Name: 'GnomeShellExtensionsDBus',

    _init: function() {
        this._dbusImpl = Gio.DBusExportedObject.wrapJSObject(GnomeShellExtensionsIface, this);
        this._dbusImpl.export(Gio.DBus.session, '/org/gnome/Shell');
        ExtensionSystem.connect('extension-state-changed',
                                Lang.bind(this, this._extensionStateChanged));
    },


    ListExtensions: function() {
        let out = {};
        for (let uuid in ExtensionUtils.extensions) {
            let dbusObj = this.GetExtensionInfo(uuid);
            out[uuid] = dbusObj;
        }
        return out;
    },

    GetExtensionInfo: function(uuid) {
        let extension = ExtensionUtils.extensions[uuid];
        if (!extension)
            return {};

        let obj = {};
        Lang.copyProperties(extension.metadata, obj);

        // Only serialize the properties that we actually need.
        const serializedProperties = ["type", "state", "path", "error", "hasPrefs"];

        serializedProperties.forEach(function(prop) {
            obj[prop] = extension[prop];
        });

        let out = {};
        for (let key in obj) {
            let val = obj[key];
            let type;
            switch (typeof val) {
            case 'string':
                type = 's';
                break;
            case 'number':
                type = 'd';
                break;
            case 'boolean':
                type = 'b';
                break;
            default:
                continue;
            }
            out[key] = GLib.Variant.new(type, val);
        }

        return out;
    },

    GetExtensionErrors: function(uuid) {
        let extension = ExtensionUtils.extensions[uuid];
        if (!extension)
            return [];

        if (!extension.errors)
            return [];

        return extension.errors;
    },

    InstallRemoteExtensionAsync: function([uuid], invocation) {
        return ExtensionDownloader.installExtension(uuid, invocation);
    },

    UninstallExtension: function(uuid) {
        return ExtensionDownloader.uninstallExtension(uuid);
    },

    LaunchExtensionPrefs: function(uuid) {
        let appSys = Shell.AppSystem.get_default();
        let app = appSys.lookup_app('gnome-shell-extension-prefs.desktop');
        app.launch(global.display.get_current_time_roundtrip(),
                   ['extension:///' + uuid], -1, null);
    },

    ReloadExtension: function(uuid) {
        let extension = ExtensionUtils.extensions[uuid];
        if (!extension)
            return;

        ExtensionSystem.reloadExtension(extension);
    },

    CheckForUpdates: function() {
        ExtensionDownloader.checkForUpdates();
    },

    ShellVersion: Config.PACKAGE_VERSION,

    _extensionStateChanged: function(_, newState) {
        this._dbusImpl.emit_signal('ExtensionStatusChanged',
                                   GLib.Variant.new('(sis)', [newState.uuid, newState.state, newState.error]));
    }
});

const ScreenSaverDBus = new Lang.Class({
    Name: 'ScreenSaverDBus',

    _init: function(screenShield) {
        this.parent();

        this._screenShield = screenShield;
        screenShield.connect('active-changed', Lang.bind(this, function(shield) {
            this._dbusImpl.emit_signal('ActiveChanged', GLib.Variant.new('(b)', [shield.active]));
        }));

        this._dbusImpl = Gio.DBusExportedObject.wrapJSObject(ScreenSaverIface, this);
        this._dbusImpl.export(Gio.DBus.session, '/org/gnome/ScreenSaver');

        Gio.DBus.session.own_name('org.gnome.ScreenSaver', Gio.BusNameOwnerFlags.REPLACE, null, null);
    },

    LockAsync: function(parameters, invocation) {
        let tmpId = this._screenShield.connect('lock-screen-shown', Lang.bind(this, function() {
            this._screenShield.disconnect(tmpId);

            invocation.return_value(null);
        }));

        this._screenShield.lock(true);
    },

    SetActive: function(active) {
        if (active)
            this._screenShield.activate(true);
        else
            this._screenShield.unlock(false);
    },

    GetActive: function() {
        return this._screenShield.active;
    },

    GetActiveTime: function() {
        let started = this._screenShield.activationTime;
        if (started > 0)
            return Math.floor((GLib.get_monotonic_time() - started) / 1000000);
        else
            return 0;
    },
});