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

const AccountsService = imports.gi.AccountsService;
const Gtk = imports.gi.Gtk;
const Meta = imports.gi.Meta;
const Lang = imports.lang;
const Signals = imports.signals;
const St = imports.gi.St;
const Gdm = imports.gi.Gdm;

const Batch = imports.misc.batch;
const Tweener = imports.ui.tweener;
const UserAvatar = imports.ui.userAvatar;

const _SCROLL_ANIMATION_TIME = 0.5;

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

    _init: function(user) {
        this.user = user;
        this._userChangedId = this.user.connect('changed',
                                                 Lang.bind(this, this._onUserChanged));

        let layout = new St.BoxLayout({ vertical: false });
        this.actor = new St.Button({ style_class: 'login-dialog-user-list-item',
                                     button_mask: St.ButtonMask.ONE | St.ButtonMask.THREE,
                                     can_focus: true,
                                     child: layout,
                                     reactive: true,
                                     x_align: St.Align.START,
                                     x_fill: true });

        this._userAvatar = new UserAvatar.UserAvatar(this.user,
                                                     { styleClass: 'login-dialog-user-list-item-icon' });
        layout.add(this._userAvatar.actor);
        let textLayout = new St.BoxLayout({ style_class: 'login-dialog-user-list-item-text-box',
                                            vertical:    true });
        layout.add(textLayout, { expand: true });

        this._nameLabel = new St.Label({ style_class: 'login-dialog-user-list-item-name' });
        this.actor.label_actor = this._nameLabel;
        textLayout.add(this._nameLabel,
                       { y_fill: false,
                         y_align: St.Align.MIDDLE,
                         expand: true });

        this._timedLoginIndicator = new St.Bin({ style_class: 'login-dialog-timed-login-indicator',
                                                 scale_x: 0 });
        textLayout.add(this._timedLoginIndicator,
                       { x_fill: true,
                         x_align: St.Align.MIDDLE,
                         y_fill: false,
                         y_align: St.Align.END });

        this.actor.connect('clicked', Lang.bind(this, this._onClicked));
        this._onUserChanged();
    },

    _onUserChanged: function() {
        this._nameLabel.set_text(this.user.get_real_name());
        this._userAvatar.update();
        this._updateLoggedIn();
    },

    syncStyleClasses: function() {
        this._updateLoggedIn();

        if (global.stage.get_key_focus() == this.actor)
            this.actor.add_style_pseudo_class('focus');
        else
            this.actor.remove_style_pseudo_class('focus');
    },

    _updateLoggedIn: function() {
        if (this.user.is_logged_in())
            this.actor.add_style_pseudo_class('logged-in');
        else
            this.actor.remove_style_pseudo_class('logged-in');
    },

    _onClicked: function() {
        this.emit('activate');
    },

    showTimedLoginIndicator: function(time) {
        let hold = new Batch.Hold();

        this.hideTimedLoginIndicator();
        Tweener.addTween(this._timedLoginIndicator,
                         { scale_x: 1.,
                           time: time,
                           transition: 'linear',
                           onComplete: function() {
                               hold.release();
                           },
                           onCompleteScope: this
                         });
        return hold;
    },

    hideTimedLoginIndicator: function() {
        Tweener.removeTweens(this._timedLoginIndicator);
        this._timedLoginIndicator.scale_x = 0.;
    }
});
Signals.addSignalMethods(UserListItem.prototype);

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

    _init: function() {
        this.actor = new St.ScrollView({ style_class: 'login-dialog-user-list-view'});
        this.actor.set_policy(Gtk.PolicyType.NEVER,
                              Gtk.PolicyType.AUTOMATIC);

        this._box = new St.BoxLayout({ vertical: true,
                                       style_class: 'login-dialog-user-list',
                                       pseudo_class: 'expanded' });

        this.actor.add_actor(this._box);
        this._items = {};

        this.actor.connect('key-focus-in', Lang.bind(this, this._moveFocusToItems));
    },

    _moveFocusToItems: function() {
        let hasItems = Object.keys(this._items).length > 0;

        if (!hasItems)
            return;

        if (global.stage.get_key_focus() != this.actor)
            return;

        let focusSet = this.actor.navigate_focus(null, Gtk.DirectionType.TAB_FORWARD, false);
        if (!focusSet) {
            Meta.later_add(Meta.LaterType.BEFORE_REDRAW, Lang.bind(this, function() {
                this._moveFocusToItems();
                return false;
            }));
        }
    },

    _onItemActivated: function(activatedItem) {
        this.emit('activate', activatedItem);
    },

    updateStyle: function(isExpanded) {
        let tasks = [];

        if (isExpanded)
            this._box.add_style_pseudo_class('expanded');
        else
            this._box.remove_style_pseudo_class('expanded');

        for (let userName in this._items) {
            let item = this._items[userName];
            item.actor.sync_hover();
            item.syncStyleClasses();
        }
    },

    scrollToItem: function(item) {
        let box = item.actor.get_allocation_box();

        let adjustment = this.actor.get_vscroll_bar().get_adjustment();

        let value = (box.y1 + adjustment.step_increment / 2.0) - (adjustment.page_size / 2.0);
        Tweener.removeTweens(adjustment);
        Tweener.addTween (adjustment,
                          { value: value,
                            time: _SCROLL_ANIMATION_TIME,
                            transition: 'easeOutQuad' });
    },

    jumpToItem: function(item) {
        let box = item.actor.get_allocation_box();

        let adjustment = this.actor.get_vscroll_bar().get_adjustment();

        let value = (box.y1 + adjustment.step_increment / 2.0) - (adjustment.page_size / 2.0);

        adjustment.set_value(value);
    },

    getItemFromUserName: function(userName) {
        let item = this._items[userName];

        if (!item)
            return null;

        return item;
    },

    addUser: function(user) {
        if (!user.is_loaded)
            return;

        if (user.is_system_account())
            return;

        if (user.locked)
           return;

        let userName = user.get_user_name();

        if (!userName)
            return;

        this.removeUser(user);

        let item = new UserListItem(user);
        this._box.add(item.actor, { x_fill: true });

        this._items[userName] = item;

        item.connect('activate',
                     Lang.bind(this, this._onItemActivated));

        // Try to keep the focused item front-and-center
        item.actor.connect('key-focus-in',
                           Lang.bind(this,
                                     function() {
                                         this.scrollToItem(item);
                                     }));

        this._moveFocusToItems();

        this.emit('item-added', item);
    },

    removeUser: function(user) {
        if (!user.is_loaded)
            return;

        let userName = user.get_user_name();

        if (!userName)
            return;

        let item = this._items[userName];

        if (!item)
            return;

        item.actor.destroy();
        delete this._items[userName];
    }
});
Signals.addSignalMethods(UserList.prototype);