/*
 *  Copyright 2016 Anyware Services
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.ametys.plugins.workspaces.project.helper;

import java.time.ZonedDateTime;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.avalon.framework.context.Context;
import org.apache.avalon.framework.context.ContextException;
import org.apache.avalon.framework.context.Contextualizable;
import org.apache.avalon.framework.logger.LogEnabled;
import org.apache.avalon.framework.logger.Logger;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.avalon.framework.service.Serviceable;
import org.apache.cocoon.components.ContextHelper;
import org.apache.cocoon.environment.Request;
import org.apache.commons.lang3.StringUtils;
import org.w3c.dom.Node;

import org.ametys.core.util.DateUtils;
import org.ametys.core.util.dom.MapElement;
import org.ametys.plugins.workspaces.project.ProjectManager;
import org.ametys.plugins.workspaces.project.objects.Project;
import org.ametys.web.repository.site.Site;
import org.ametys.web.repository.site.SiteManager;

/**
 * Helper component to be used from XSL stylesheets to get info related to projects.
 */
public class ProjectXsltHelper implements Serviceable, Contextualizable, LogEnabled
{
    private static Logger _logger;
    private static Context _context;
    private static SiteManager _siteManager;
    private static ProjectManager _projectManager;
    
    @Override
    public void contextualize(Context context) throws ContextException
    {
        _context = context;
    }
    
    @Override
    public void enableLogging(Logger logger)
    {
        _logger = logger;
    }
    
    @Override
    public void service(ServiceManager manager) throws ServiceException
    {
        _siteManager = (SiteManager) manager.lookup(SiteManager.ROLE);
        _projectManager = (ProjectManager) manager.lookup(ProjectManager.ROLE);
    }
    
    /**
     * Returns the current project
     * @return the current project
     */
    public static String project()
    {
        Project project = null;
        
        Request request = ContextHelper.getRequest(_context);
        String siteName = (String) request.getAttribute("site");
        
        if (StringUtils.isNotEmpty(siteName) && _siteManager.hasSite(siteName))
        {
            Site site = _siteManager.getSite(siteName);
            List<Project> projects = _projectManager.getProjectsForSite(site);
            
            project = !projects.isEmpty() ? projects.get(0) : null;
        }
        
        if (project == null && _logger.isWarnEnabled())
        {
            String warnMsg = String.format("No project was found for site '%s'.", siteName);
            _logger.warn(warnMsg);
        }
        
        return project != null ? project.getName() : null;
    }
    
    /**
     * Returns the title of the current project
     * @return the title of the current project
     */
    public static String projectTitle()
    {
        return projectTitle(project());
    }
    
    /**
     * Returns the title of the given project
     * @param projectName The project to consider
     * @return the title of the given project or empty otherwise
     */
    public static String projectTitle(String projectName)
    {
        String title = "";
        
        Project project = _projectManager.getProject(projectName);
        if (project != null)
        {
            title = project.getTitle();
        }
        
        return title;
    }
    
    /**
     * Returns the description of the current project
     * @return the description of the current project
     */
    public static String projectDescription()
    {
        return projectDescription(project());
    }
    
    /**
     * Returns the description of the given project
     * @param projectName The project to consider
     * @return the description of the given project or empty otherwise
     */
    public static String projectDescription(String projectName)
    {
        String title = "";
        
        Project project = _projectManager.getProject(projectName);
        if (project != null)
        {
            title = project.getDescription();
        }
        
        return title;
    }
    
    /**
     * Returns the creation date of the current project
     * @return the creation date of the current project at the ISO format or empty otherwise
     */
    public static String projectCreationDate()
    {
        return projectCreationDate(project());
    }
    
    /**
     * Returns the creation date of the given project
     * @param projectName The project to consider
     * @return the creation date of the given project at the ISO format or empty otherwise
     */
    public static String projectCreationDate(String projectName)
    {
        String creationDate = "";
        
        Project project = _projectManager.getProject(projectName);
        if (project != null)
        {
            ZonedDateTime date = project.getCreationDate();
            creationDate = date.format(DateUtils.getISODateTimeFormatter());
        }
        
        return creationDate;
    }
    
    /**
     * True if the resource comes from workspaces
     * @param resourceId the resource id
     * @return true if the resource comes from workspaces
     */
    public static boolean isResourceFromWorkspace(String resourceId)
    {
        return _projectManager.getParentProject(resourceId) != null;
    }
    
    /**
     * Get the site of a project's resource
     * @param projectResourceId The resource id
     * @return The site &lt;site id="site://xxx" name="siteName"&gt;&lt;title&gt;Site's titleX&lt;/title&gt;&lt;url&gt;http://...&lt;/url&gt;/site&gt;
     */
    public static Node resourceSite(String projectResourceId)
    {
        Project project = _projectManager.getParentProject(projectResourceId);
        if (project != null)
        {
            Site site = project.getSites().iterator().next();
            
            Map<String, String> attributes = new HashMap<>();
            attributes.put("name", site.getName());
            attributes.put("id", site.getId());
            
            Map<String, String> values = new HashMap<>();
            values.put("title", site.getTitle());
            values.put("url", site.getUrl());
            
            return new MapElement("site", attributes, values);
        }
        
        return null;
    }
}