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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.knowledge.base.web.internal.display.context;

import com.liferay.knowledge.base.constants.KBFolderConstants;
import com.liferay.knowledge.base.model.KBArticle;
import com.liferay.knowledge.base.model.KBFolder;
import com.liferay.knowledge.base.service.KBArticleLocalServiceUtil;
import com.liferay.knowledge.base.service.KBFolderServiceUtil;
import com.liferay.knowledge.base.util.KnowledgeBaseUtil;
import com.liferay.knowledge.base.web.configuration.KBDisplayPortletInstanceConfiguration;
import com.liferay.knowledge.base.web.internal.KBUtil;
import com.liferay.portal.kernel.exception.PortalException;
import com.liferay.portal.kernel.portlet.PortalPreferences;
import com.liferay.portal.kernel.util.GetterUtil;
import com.liferay.portal.kernel.util.PortalUtil;
import com.liferay.portal.kernel.workflow.WorkflowConstants;

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

import javax.portlet.PortletRequest;

/**
 * @author Adolfo Pérez
 */
public class KBNavigationDisplayContext {

	public KBNavigationDisplayContext(
		PortletRequest portletRequest, PortalPreferences portalPreferences,
		KBDisplayPortletInstanceConfiguration
			kbDisplayPortletInstanceConfiguration,
		KBArticle kbArticle) {

		_portletRequest = portletRequest;
		_portalPreferences = portalPreferences;
		_kbDisplayPortletInstanceConfiguration =
			kbDisplayPortletInstanceConfiguration;
		_kbArticle = kbArticle;
	}

	public List getAncestorResourcePrimaryKeys() throws PortalException {
		List ancestorResourcePrimaryKeys = new ArrayList<>();

		if (_kbArticle != null) {
			KBArticle latestKBArticle =
				KBArticleLocalServiceUtil.getLatestKBArticle(
					_kbArticle.getResourcePrimKey(),
					WorkflowConstants.STATUS_APPROVED);

			ancestorResourcePrimaryKeys =
				latestKBArticle.getAncestorResourcePrimaryKeys();

			Collections.reverse(ancestorResourcePrimaryKeys);
		}
		else {
			ancestorResourcePrimaryKeys.add(
				KBFolderConstants.DEFAULT_PARENT_FOLDER_ID);
		}

		return ancestorResourcePrimaryKeys;
	}

	public String getCurrentKBFolderURLTitle() throws PortalException {
		String currentKBFolderURLTitle = KBUtil.getPreferredKBFolderURLTitle(
			_portalPreferences,
			_kbDisplayPortletInstanceConfiguration.contentRootPrefix());

		long rootResourcePrimKey = getRootResourcePrimKey();

		if (rootResourcePrimKey != KBFolderConstants.DEFAULT_PARENT_FOLDER_ID) {
			KBFolder kbFolder = KBFolderServiceUtil.getKBFolder(
				rootResourcePrimKey);

			currentKBFolderURLTitle = kbFolder.getUrlTitle();
		}

		return currentKBFolderURLTitle;
	}

	public String getPageTitle() throws PortalException {
		long rootResourcePrimKey = getRootResourcePrimKey();

		String pageTitle = null;

		if (rootResourcePrimKey != KBFolderConstants.DEFAULT_PARENT_FOLDER_ID) {
			KBFolder kbFolder = KBFolderServiceUtil.getKBFolder(
				rootResourcePrimKey);

			pageTitle =
				_kbDisplayPortletInstanceConfiguration.contentRootPrefix() +
					" " + kbFolder.getName();

			if (_kbArticle != null) {
				pageTitle = _kbArticle.getTitle() + " - " + pageTitle;
			}
		}
		else {
			if (_kbArticle != null) {
				pageTitle = _kbArticle.getTitle();
			}
		}

		return pageTitle;
	}

	public long getRootResourcePrimKey() throws PortalException {
		if (_rootResourcePrimKey == null) {
			_rootResourcePrimKey = KBFolderConstants.DEFAULT_PARENT_FOLDER_ID;

			if (_kbArticle != null) {
				_rootResourcePrimKey = KnowledgeBaseUtil.getKBFolderId(
					_kbArticle.getParentResourceClassNameId(),
					_kbArticle.getParentResourcePrimKey());
			}

			if (_rootResourcePrimKey ==
					KBFolderConstants.DEFAULT_PARENT_FOLDER_ID) {

				_rootResourcePrimKey = KBUtil.getRootResourcePrimKey(
					_portletRequest,
					PortalUtil.getScopeGroupId(_portletRequest),
					getResourceClassNameId(), getResourcePrimKey());
			}
		}

		return _rootResourcePrimKey;
	}

	public boolean isLeftNavigationVisible() throws PortalException {
		if (_leftNavigationVisible == null) {
			_leftNavigationVisible = hasMultipleDescendantKBArticles();
		}

		return _leftNavigationVisible;
	}

	public boolean isTopNavigationVisible() throws PortalException {
		long kbFolderClassNameId = PortalUtil.getClassNameId(
			KBFolderConstants.getClassName());

		if ((getResourceClassNameId() == kbFolderClassNameId) &&
			!isLeftNavigationVisible()) {

			return true;
		}

		return false;
	}

	protected long getResourceClassNameId() {
		if (_resourceClassNameId == null) {
			if (_kbDisplayPortletInstanceConfiguration.resourceClassNameId() !=
					0) {

				_resourceClassNameId =
					_kbDisplayPortletInstanceConfiguration.
						resourceClassNameId();
			}
			else {
				_resourceClassNameId = PortalUtil.getClassNameId(
					KBFolderConstants.getClassName());
			}
		}

		return _resourceClassNameId;
	}

	protected long getResourcePrimKey() {
		if (_resourcePrimKey == null) {
			_resourcePrimKey = GetterUtil.getLong(
				_kbDisplayPortletInstanceConfiguration.resourcePrimKey());
		}

		return _resourcePrimKey;
	}

	protected boolean hasMultipleDescendantKBArticles() throws PortalException {
		long scopeGroupId = PortalUtil.getScopeGroupId(_portletRequest);

		long kbFolderClassNameId = PortalUtil.getClassNameId(
			KBFolderConstants.getClassName());

		if (getResourceClassNameId() == kbFolderClassNameId) {
			List kbFolders = KBUtil.getAlternateRootKBFolders(
				scopeGroupId, getResourcePrimKey());

			if (kbFolders.size() > 1) {
				int maxKBArticlesCount = 0;

				for (KBFolder kbFolder : kbFolders) {
					int kbArticlesCount =
						KBArticleLocalServiceUtil.getKBFolderKBArticlesCount(
							scopeGroupId, kbFolder.getKbFolderId(),
							WorkflowConstants.STATUS_APPROVED);

					if (kbArticlesCount > maxKBArticlesCount) {
						maxKBArticlesCount = kbArticlesCount;
					}
				}

				if (maxKBArticlesCount > 1) {
					return true;
				}

				return false;
			}
		}

		boolean showNavigation = true;

		long rootResourcePrimKey = getRootResourcePrimKey();

		int kbArticlesCount = KBArticleLocalServiceUtil.getKBArticlesCount(
			scopeGroupId, rootResourcePrimKey,
			WorkflowConstants.STATUS_APPROVED);

		if (kbArticlesCount == 0) {
			showNavigation = false;
		}
		else if (kbArticlesCount == 1) {
			List kbArticles =
				KBArticleLocalServiceUtil.getKBArticles(
					scopeGroupId, rootResourcePrimKey,
					WorkflowConstants.STATUS_APPROVED, 0, 1, null);

			KBArticle navigationKBArticle = kbArticles.get(0);

			int navigationKBArticleChildCount =
				KBArticleLocalServiceUtil.getKBArticlesCount(
					scopeGroupId, navigationKBArticle.getResourcePrimKey(),
					WorkflowConstants.STATUS_APPROVED);

			if (navigationKBArticleChildCount == 0) {
				showNavigation = false;
			}
		}

		return showNavigation;
	}

	private final KBArticle _kbArticle;
	private final KBDisplayPortletInstanceConfiguration
		_kbDisplayPortletInstanceConfiguration;
	private Boolean _leftNavigationVisible;
	private final PortalPreferences _portalPreferences;
	private final PortletRequest _portletRequest;
	private Long _resourceClassNameId;
	private Long _resourcePrimKey;
	private Long _rootResourcePrimKey;

}