/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of the Liferay Enterprise
 * Subscription License ("License"). You may not use this file except in
 * compliance with the License. You can obtain a copy of the License by
 * contacting Liferay, Inc. See the License for the specific language governing
 * permissions and limitations under the License, including but not limited to
 * distribution rights of the Software.
 *
 *
 *
 */

package com.liferay.site.navigation.taglib.internal.util;

import com.liferay.portal.kernel.exception.PortalException;
import com.liferay.portal.kernel.log.Log;
import com.liferay.portal.kernel.log.LogFactoryUtil;
import com.liferay.portal.kernel.model.Layout;
import com.liferay.portal.kernel.service.LayoutLocalService;
import com.liferay.portal.kernel.theme.NavItem;
import com.liferay.portal.kernel.theme.ThemeDisplay;
import com.liferay.portal.kernel.util.Validator;
import com.liferay.portal.kernel.util.WebKeys;
import com.liferay.site.navigation.model.SiteNavigationMenuItem;
import com.liferay.site.navigation.service.SiteNavigationMenuItemLocalService;
import com.liferay.site.navigation.type.SiteNavigationMenuItemType;
import com.liferay.site.navigation.type.SiteNavigationMenuItemTypeRegistry;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Reference;

/**
 * @author Pavel Savinov
 */
@Component(immediate = true, service = {})
public class NavItemUtil {

	public static List<NavItem> getBranchNavItems(
			HttpServletRequest httpServletRequest)
		throws PortalException {

		ThemeDisplay themeDisplay =
			(ThemeDisplay)httpServletRequest.getAttribute(
				WebKeys.THEME_DISPLAY);

		Layout layout = themeDisplay.getLayout();

		if (layout.isRootLayout()) {
			return Collections.singletonList(
				new NavItem(httpServletRequest, themeDisplay, layout, null));
		}

		List<Layout> ancestorLayouts = layout.getAncestors();

		List<NavItem> navItems = new ArrayList<>(ancestorLayouts.size() + 1);

		for (int i = ancestorLayouts.size() - 1; i >= 0; i--) {
			Layout ancestorLayout = ancestorLayouts.get(i);

			navItems.add(
				new NavItem(
					httpServletRequest, themeDisplay, ancestorLayout, null));
		}

		navItems.add(
			new NavItem(httpServletRequest, themeDisplay, layout, null));

		return navItems;
	}

	public static List<NavItem> getChildNavItems(
		HttpServletRequest httpServletRequest, long siteNavigationMenuId,
		long parentSiteNavigationMenuItemId) {

		ThemeDisplay themeDisplay =
			(ThemeDisplay)httpServletRequest.getAttribute(
				WebKeys.THEME_DISPLAY);

		List<SiteNavigationMenuItem> siteNavigationMenuItems =
			_siteNavigationMenuItemLocalService.getSiteNavigationMenuItems(
				siteNavigationMenuId, parentSiteNavigationMenuItemId);

		List<NavItem> navItems = new ArrayList<>(
			siteNavigationMenuItems.size());

		for (SiteNavigationMenuItem siteNavigationMenuItem :
				siteNavigationMenuItems) {

			SiteNavigationMenuItemType siteNavigationMenuItemType =
				_siteNavigationMenuItemTypeRegistry.
					getSiteNavigationMenuItemType(
						siteNavigationMenuItem.getType());

			try {
				if (!siteNavigationMenuItemType.hasPermission(
						themeDisplay.getPermissionChecker(),
						siteNavigationMenuItem)) {

					continue;
				}

				navItems.add(
					new SiteNavigationMenuNavItem(
						httpServletRequest, themeDisplay,
						siteNavigationMenuItem));
			}
			catch (PortalException portalException) {
				if (_log.isDebugEnabled()) {
					_log.debug(portalException, portalException);
				}
			}
		}

		return navItems;
	}

	public static List<NavItem> getNavItems(
			HttpServletRequest httpServletRequest, String rootLayoutType,
			int rootLayoutLevel, String rootLayoutUuid,
			List<NavItem> branchNavItems)
		throws Exception {

		ThemeDisplay themeDisplay =
			(ThemeDisplay)httpServletRequest.getAttribute(
				WebKeys.THEME_DISPLAY);

		List<NavItem> navItems = null;
		NavItem rootNavItem = null;

		if (rootLayoutType.equals("absolute")) {
			if (rootLayoutLevel == 0) {
				navItems = NavItem.fromLayouts(
					httpServletRequest, themeDisplay, null);
			}
			else if (branchNavItems.size() >= rootLayoutLevel) {
				rootNavItem = branchNavItems.get(rootLayoutLevel - 1);
			}
		}
		else if (rootLayoutType.equals("relative")) {
			if ((rootLayoutLevel >= 0) &&
				(rootLayoutLevel <= (branchNavItems.size() + 1))) {

				int absoluteLevel = branchNavItems.size() - 1 - rootLayoutLevel;

				if (absoluteLevel == -1) {
					navItems = NavItem.fromLayouts(
						httpServletRequest, themeDisplay, null);
				}
				else if ((absoluteLevel >= 0) &&
						 (absoluteLevel < branchNavItems.size())) {

					rootNavItem = branchNavItems.get(absoluteLevel);
				}
			}
		}
		else if (rootLayoutType.equals("select")) {
			if (Validator.isNotNull(rootLayoutUuid)) {
				Layout layout = themeDisplay.getLayout();

				Layout rootLayout =
					_layoutLocalService.fetchLayoutByUuidAndGroupId(
						rootLayoutUuid, layout.getGroupId(), false);

				if (rootLayout == null) {
					rootLayout =
						_layoutLocalService.fetchLayoutByUuidAndGroupId(
							rootLayoutUuid, layout.getGroupId(), true);
				}

				if (rootLayout != null) {
					rootNavItem = new NavItem(
						httpServletRequest, themeDisplay, rootLayout, null);
				}
			}
			else {
				navItems = NavItem.fromLayouts(
					httpServletRequest, themeDisplay, null);
			}
		}

		if (rootNavItem == null) {
			if (navItems == null) {
				return new ArrayList<>();
			}

			return navItems;
		}

		return rootNavItem.getChildren();
	}

	@Reference(unbind = "-")
	protected void setLayoutLocalService(
		LayoutLocalService layoutLocalService) {

		_layoutLocalService = layoutLocalService;
	}

	@Reference(unbind = "-")
	protected void setSiteNavigationMenuItemLocalService(
		SiteNavigationMenuItemLocalService siteNavigationMenuItemLocalService) {

		_siteNavigationMenuItemLocalService =
			siteNavigationMenuItemLocalService;
	}

	@Reference(unbind = "-")
	protected void setSiteNavigationMenuItemTypeRegistry(
		SiteNavigationMenuItemTypeRegistry siteNavigationMenuItemTypeRegistry) {

		_siteNavigationMenuItemTypeRegistry =
			siteNavigationMenuItemTypeRegistry;
	}

	private static final Log _log = LogFactoryUtil.getLog(NavItemUtil.class);

	private static LayoutLocalService _layoutLocalService;
	private static SiteNavigationMenuItemLocalService
		_siteNavigationMenuItemLocalService;
	private static SiteNavigationMenuItemTypeRegistry
		_siteNavigationMenuItemTypeRegistry;

}