var
	_ = require('_'),
	$ = require('$'),
	ko = require('ko'),

	Globals = require('Common/Globals'),
	Utils = require('Common/Utils'),
	Links = require('Common/Links'),

	kn = require('Knoin/Knoin'),
	AbstractScreen = require('Knoin/AbstractScreen');

/**
 * @constructor
 * @param {Array} aViewModels
 * @extends AbstractScreen
 */
function AbstractSettingsScreen(aViewModels)
{
	AbstractScreen.call(this, 'settings', aViewModels);

	this.menu = ko.observableArray([]);

	this.oCurrentSubScreen = null;
	this.oViewModelPlace = null;

	this.setupSettings();
}

_.extend(AbstractSettingsScreen.prototype, AbstractScreen.prototype);

/**
 * @param {Function=} fCallback
 */
AbstractSettingsScreen.prototype.setupSettings = function(fCallback)
{
	if (fCallback)
	{
		fCallback();
	}
};

AbstractSettingsScreen.prototype.onRoute = function(sSubName)
{
	var
		self = this,
		oSettingsScreen = null,
		RoutedSettingsViewModel = null,
		oViewModelPlace = null,
		oViewModelDom = null;

	RoutedSettingsViewModel = _.find(Globals.aViewModels.settings, function(SettingsViewModel) {
		return SettingsViewModel && SettingsViewModel.__rlSettingsData &&
			sSubName === SettingsViewModel.__rlSettingsData.Route;
	});

	if (RoutedSettingsViewModel)
	{
		if (_.find(Globals.aViewModels['settings-removed'], function(DisabledSettingsViewModel) {
			return DisabledSettingsViewModel && DisabledSettingsViewModel === RoutedSettingsViewModel;
		}))
		{
			RoutedSettingsViewModel = null;
		}

		if (RoutedSettingsViewModel && _.find(Globals.aViewModels['settings-disabled'], function(DisabledSettingsViewModel) {
			return DisabledSettingsViewModel && DisabledSettingsViewModel === RoutedSettingsViewModel;
		}))
		{
			RoutedSettingsViewModel = null;
		}
	}

	if (RoutedSettingsViewModel)
	{
		if (RoutedSettingsViewModel.__builded && RoutedSettingsViewModel.__vm)
		{
			oSettingsScreen = RoutedSettingsViewModel.__vm;
		}
		else
		{
			oViewModelPlace = this.oViewModelPlace;
			if (oViewModelPlace && 1 === oViewModelPlace.length)
			{
				oSettingsScreen = new RoutedSettingsViewModel();

				oViewModelDom = $('<div></div>').addClass('rl-settings-view-model').hide();
				oViewModelDom.appendTo(oViewModelPlace);

				oSettingsScreen.viewModelDom = oViewModelDom;

				oSettingsScreen.__rlSettingsData = RoutedSettingsViewModel.__rlSettingsData;

				RoutedSettingsViewModel.__dom = oViewModelDom;
				RoutedSettingsViewModel.__builded = true;
				RoutedSettingsViewModel.__vm = oSettingsScreen;

				ko.applyBindingAccessorsToNode(oViewModelDom[0], {
					translatorInit: true,
					template: function() {
						return {
							name: RoutedSettingsViewModel.__rlSettingsData.Template
						};
					}
				}, oSettingsScreen);

				Utils.delegateRun(oSettingsScreen, 'onBuild', [oViewModelDom]);
			}
			else
			{
				Utils.log('Cannot find sub settings view model position: SettingsSubScreen');
			}
		}

		if (oSettingsScreen)
		{
			_.defer(function() {
				// hide
				if (self.oCurrentSubScreen)
				{
					Utils.delegateRun(self.oCurrentSubScreen, 'onHide');
					self.oCurrentSubScreen.viewModelDom.hide();
				}
				// --

				self.oCurrentSubScreen = oSettingsScreen;

				// show
				if (self.oCurrentSubScreen)
				{
					Utils.delegateRun(self.oCurrentSubScreen, 'onBeforeShow');
					self.oCurrentSubScreen.viewModelDom.show();
					Utils.delegateRun(self.oCurrentSubScreen, 'onShow');
					Utils.delegateRun(self.oCurrentSubScreen, 'onShowWithDelay', [], 200);

					_.each(self.menu(), function(oItem) {
						oItem.selected(oSettingsScreen && oSettingsScreen.__rlSettingsData && oItem.route === oSettingsScreen.__rlSettingsData.Route);
					});

					$('#rl-content .b-settings .b-content .content').scrollTop(0);
				}
				// --

				Utils.windowResize();
			});
		}
	}
	else
	{
		kn.setHash(Links.settings(), false, true);
	}
};

AbstractSettingsScreen.prototype.onHide = function()
{
	if (this.oCurrentSubScreen && this.oCurrentSubScreen.viewModelDom)
	{
		Utils.delegateRun(this.oCurrentSubScreen, 'onHide');
		this.oCurrentSubScreen.viewModelDom.hide();
	}
};

AbstractSettingsScreen.prototype.onBuild = function()
{
	_.each(Globals.aViewModels.settings, function(SettingsViewModel) {
		if (SettingsViewModel && SettingsViewModel.__rlSettingsData &&
			!_.find(Globals.aViewModels['settings-removed'], function(RemoveSettingsViewModel) {
				return RemoveSettingsViewModel && RemoveSettingsViewModel === SettingsViewModel;
			}))
		{
			this.menu.push({
				route: SettingsViewModel.__rlSettingsData.Route,
				label: SettingsViewModel.__rlSettingsData.Label,
				selected: ko.observable(false),
				disabled: !!_.find(Globals.aViewModels['settings-disabled'], function(DisabledSettingsViewModel) {
					return DisabledSettingsViewModel && DisabledSettingsViewModel === SettingsViewModel;
				})
			});
		}
	}, this);

	this.oViewModelPlace = $('#rl-content #rl-settings-subscreen');
};

AbstractSettingsScreen.prototype.routes = function()
{
	var
		DefaultViewModel = _.find(Globals.aViewModels.settings, function(SettingsViewModel) {
			return SettingsViewModel && SettingsViewModel.__rlSettingsData && SettingsViewModel.__rlSettingsData.IsDefault;
		}),
		sDefaultRoute = DefaultViewModel && DefaultViewModel.__rlSettingsData ?
			DefaultViewModel.__rlSettingsData.Route : 'general',
		oRules = {
			subname: /^(.*)$/,
			normalize_: function(oRequest, oVals) {
				oVals.subname = Utils.isUnd(oVals.subname) ? sDefaultRoute : Utils.pString(oVals.subname);
				return [oVals.subname];
			}
		};

	return [
		['{subname}/', oRules],
		['{subname}', oRules],
		['', oRules]
	];
};

module.exports = AbstractSettingsScreen;