/* RainLoop Webmail (c) RainLoop Team | Licensed under CC BY-NC-SA 3.0 */

/**
 * @constructor
 * @extends KnoinAbstractViewModel
 */
function MailBoxFolderListViewModel()
{
	KnoinAbstractViewModel.call(this, 'Left', 'MailFolderList');

	var oData = RL.data();

	this.oContentVisible = null;
	this.oContentScrollable = null;

	this.messageList = oData.messageList;
	this.folderList = oData.folderList;
	this.folderListSystem = oData.folderListSystem;
	this.foldersChanging = oData.foldersChanging;

	this.leftPanelDisabled = oData.leftPanelDisabled;

	this.iDropOverTimer = 0;

	this.allowContacts = !!RL.settingsGet('ContactsIsAllowed');

	Knoin.constructorEnd(this);
}

Utils.extendAsViewModel('MailBoxFolderListViewModel', MailBoxFolderListViewModel);

MailBoxFolderListViewModel.prototype.onBuild = function (oDom)
{
	this.oContentVisible = $('.b-content', oDom);
	this.oContentScrollable = $('.content', this.oContentVisible);

	var self = this;

	oDom
		.on('click', '.b-folders .e-item .e-link .e-collapsed-sign', function (oEvent) {

			var
				oFolder = ko.dataFor(this),
				bCollapsed = false
			;

			if (oFolder && oEvent)
			{
				bCollapsed = oFolder.collapsed();
				Utils.setExpandedFolder(oFolder.fullNameHash, bCollapsed);

				oFolder.collapsed(!bCollapsed);
				oEvent.preventDefault();
				oEvent.stopPropagation();
			}
		})
		.on('click', '.b-folders .e-item .e-link.selectable', function (oEvent) {

			oEvent.preventDefault();

			var
				oData = RL.data(),
				oFolder = ko.dataFor(this)
			;

			if (oFolder)
			{
				if (Enums.Layout.NoPreview === oData.layout())
				{
					oData.message(null);
				}

				if (oFolder.fullNameRaw === oData.currentFolderFullNameRaw())
				{
					RL.cache().setFolderHash(oFolder.fullNameRaw, '');
				}

				kn.setHash(RL.link().mailBox(oFolder.fullNameHash));
			}
		})
	;

	key('up, down', Enums.KeyState.FolderList, function (event, handler) {

		var
			iIndex = -1,
			iKeyCode = handler && 'up' === handler.shortcut ? 38 : 40,
			$items = $('.b-folders .e-item .e-link:not(.hidden):visible', oDom)
		;

		if (event && $items.length)
		{
			iIndex = $items.index($items.filter('.focused'));
			if (-1 < iIndex)
			{
				$items.eq(iIndex).removeClass('focused');
			}

			if (iKeyCode === 38 && iIndex > 0)
			{
				iIndex--;
			}
			else if (iKeyCode === 40 && iIndex < $items.length - 1)
			{
				iIndex++;
			}

			$items.eq(iIndex).addClass('focused');
			self.scrollToFocused();
		}

		return false;
	});

	key('enter', Enums.KeyState.FolderList, function () {
		var $items = $('.b-folders .e-item .e-link:not(.hidden).focused', oDom);
		if ($items.length && $items[0])
		{
			self.folderList.focused(false);
			$items.click();
		}

		return false;
	});

	key('space', Enums.KeyState.FolderList, function () {
		var bCollapsed = true, oFolder = null, $items = $('.b-folders .e-item .e-link:not(.hidden).focused', oDom);
		if ($items.length && $items[0])
		{
			oFolder = ko.dataFor($items[0]);
			if (oFolder)
			{
				bCollapsed = oFolder.collapsed();
				Utils.setExpandedFolder(oFolder.fullNameHash, bCollapsed);
				oFolder.collapsed(!bCollapsed);
			}
		}

		return false;
	});

	key('esc, tab, shift+tab, right', Enums.KeyState.FolderList, function () {
		self.folderList.focused(false);
		return false;
	});

	self.folderList.focused.subscribe(function (bValue) {
		$('.b-folders .e-item .e-link.focused', oDom).removeClass('focused');
		if (bValue)
		{
			$('.b-folders .e-item .e-link.selected', oDom).addClass('focused');
		}
	});
};

MailBoxFolderListViewModel.prototype.messagesDropOver = function (oFolder)
{
	window.clearTimeout(this.iDropOverTimer);
	if (oFolder && oFolder.collapsed())
	{
		this.iDropOverTimer = window.setTimeout(function () {
			oFolder.collapsed(false);
			Utils.setExpandedFolder(oFolder.fullNameHash, true);
			Utils.windowResize();
		}, 500);
	}
};

MailBoxFolderListViewModel.prototype.messagesDropOut = function ()
{
	window.clearTimeout(this.iDropOverTimer);
};

MailBoxFolderListViewModel.prototype.scrollToFocused = function ()
{
	if (!this.oContentVisible || !this.oContentScrollable)
	{
		return false;
	}

	var
		iOffset = 20,
		oFocused = $('.e-item .e-link.focused', this.oContentScrollable),
		oPos = oFocused.position(),
		iVisibleHeight = this.oContentVisible.height(),
		iFocusedHeight = oFocused.outerHeight()
	;

	if (oPos && (oPos.top < 0 || oPos.top + iFocusedHeight > iVisibleHeight))
	{
		if (oPos.top < 0)
		{
			this.oContentScrollable.scrollTop(this.oContentScrollable.scrollTop() + oPos.top - iOffset);
		}
		else
		{
			this.oContentScrollable.scrollTop(this.oContentScrollable.scrollTop() + oPos.top - iVisibleHeight + iFocusedHeight + iOffset);
		}

		return true;
	}

	return false;
};

/**
 *
 * @param {FolderModel} oToFolder
 * @param {{helper:jQuery}} oUi
 */
MailBoxFolderListViewModel.prototype.messagesDrop = function (oToFolder, oUi)
{
	if (oToFolder && oUi && oUi.helper)
	{
		var
			sFromFolderFullNameRaw = oUi.helper.data('rl-folder'),
			bCopy = $html.hasClass('rl-ctrl-key-pressed'),
			aUids = oUi.helper.data('rl-uids')
		;

		if (Utils.isNormal(sFromFolderFullNameRaw) && '' !== sFromFolderFullNameRaw && Utils.isArray(aUids))
		{
			RL.moveMessagesToFolder(sFromFolderFullNameRaw, aUids, oToFolder.fullNameRaw, bCopy);
		}
	}
};

MailBoxFolderListViewModel.prototype.composeClick = function ()
{
	kn.showScreenPopup(PopupsComposeViewModel);
};

MailBoxFolderListViewModel.prototype.createFolder = function ()
{
	kn.showScreenPopup(PopupsFolderCreateViewModel);
};

MailBoxFolderListViewModel.prototype.configureFolders = function ()
{
	kn.setHash(RL.link().settings('folders'));
};

MailBoxFolderListViewModel.prototype.contactsClick = function ()
{
	if (this.allowContacts)
	{
		kn.showScreenPopup(PopupsContactsViewModel);
	}
};