/*
 *  Copyright 2011 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.blog.repository;

import java.util.Collections;
import java.util.Set;

import org.ametys.cms.repository.Content;
import org.ametys.plugins.explorer.resources.ResourceCollection;
import org.ametys.plugins.repository.AmetysObject;
import org.ametys.plugins.repository.AmetysObjectIterable;
import org.ametys.plugins.repository.AmetysObjectResolver;
import org.ametys.plugins.repository.AmetysRepositoryException;
import org.ametys.plugins.repository.EmptyIterable;
import org.ametys.plugins.repository.UnknownAmetysObjectException;
import org.ametys.plugins.repository.metadata.CompositeMetadata;
import org.ametys.web.repository.page.Page;
import org.ametys.web.repository.page.PagesContainer;
import org.ametys.web.repository.page.Zone;
import org.ametys.web.repository.site.Site;
import org.ametys.web.repository.sitemap.Sitemap;
import org.ametys.web.skin.Skin;
import org.ametys.web.skin.SkinsManager;

/**
 * Page representing a post.
 */
public class VirtualPostPage extends AbstractBlogPage
{
    private PagesContainer _root;
    private Content _post;
    private String _path;
    private SkinsManager _skinsManager;
    
    /**
     * Constructor.
     * @param skinsManager the skins manager
     * @param resolver the {@link AmetysObjectResolver}.
     * @param root the blog root page.
     * @param post the post.
     * @param path path from the virtual root
     */
    public VirtualPostPage(AmetysObjectResolver resolver, SkinsManager skinsManager, PagesContainer root, Content post, String path)
    {
        _root = root;
        _skinsManager = skinsManager;
        _post = post;
        _path = path;
    }
    
    /**
     * Returns the associated {@link Content}.
     * @return the associated {@link Content}.
     */
    public Content getPost()
    {
        return _post;
    }
    
    @Override
    public int getDepth() throws AmetysRepositoryException
    {
        int depth = 0;
        if (_root instanceof Page)
        {
            depth = ((Page) _root).getDepth();
        }
        
        return depth + _path.split("/").length;
    }

    @Override
    public Set<String> getReferers() throws AmetysRepositoryException
    {
        throw new UnsupportedOperationException("getReferers not supported on virtual post pages");
    }

    @Override
    public ResourceCollection getRootAttachments() throws AmetysRepositoryException
    {
        return null;
    }
    
    @Override
    public String getTitle() throws AmetysRepositoryException
    {
        return _post.getTitle();
    }

    @Override
    public String getLongTitle() throws AmetysRepositoryException
    {
        return _post.getTitle();
    }
    
    @Override
    public String getURL() throws AmetysRepositoryException
    {
        throw new UnsupportedOperationException("getURL not supported on virtual post pages");
    }

    @Override
    public LinkType getURLType() throws AmetysRepositoryException
    {
        throw new UnsupportedOperationException("getURLType not supported on virtual post pages");
    }
    
    @Override
    protected Zone getDefaultZone()
    {
        return new PostZone(this);
    }
    
    @Override
    public AmetysObjectIterable<? extends Page> getChildrenPages() throws AmetysRepositoryException
    {
        return new EmptyIterable<>();
    }
    
    @Override
    public Page getChildPageAt(int index) throws UnknownAmetysObjectException, AmetysRepositoryException
    {
        throw new UnknownAmetysObjectException("There's no child page at index " + index + " for page " + this.getId());
    }

    @Override
    public String getPathInSitemap() throws AmetysRepositoryException
    {
        String rootPath = _root.getPathInSitemap();
        
        StringBuilder buff = new StringBuilder(rootPath);
        if (!rootPath.isEmpty())
        {
            buff.append('/');
        }
        buff.append(_path).append('/').append(_post.getName());
        
        return buff.toString();
    }

    @Override
    public Site getSite() throws AmetysRepositoryException
    {
        return _root.getSite();
    }

    @Override
    public String getSiteName() throws AmetysRepositoryException
    {
        return _root.getSiteName();
    }

    @Override
    public Sitemap getSitemap() throws AmetysRepositoryException
    {
        return _root.getSitemap();
    }

    @Override
    public String getSitemapName() throws AmetysRepositoryException
    {
        return _root.getSitemapName();
    }

    @Override
    public <A extends AmetysObject> A getChild(String path) throws AmetysRepositoryException, UnknownAmetysObjectException
    {
        throw new UnknownAmetysObjectException("Unknown child page '" + path + "' for page " + getId());
    }
    
    @SuppressWarnings("unchecked")
    @Override
    public AmetysObjectIterable<? extends Page> getChildren() throws AmetysRepositoryException
    {
        return new EmptyIterable<>();
    }
    
    @Override
    public AmetysObjectIterable< ? extends Page> getChildrenPages(boolean includeInvisiblePages) throws AmetysRepositoryException
    {
        return getChildrenPages();
    }

    @Override
    public boolean hasChild(String name) throws AmetysRepositoryException
    {
        return false;
    }
    
    @Override
    public String getId() throws AmetysRepositoryException
    {
        return "post://" + _path + "?rootId=" + _root.getId() + "&postId=" + _post.getId();
    }

    @Override
    public String getName() throws AmetysRepositoryException
    {
        return _post.getName();
    }

    @SuppressWarnings("unchecked")
    @Override
    public Page getParent() throws AmetysRepositoryException
    {
        return _root.getChild(_path);
    }

    @Override
    public String getParentPath() throws AmetysRepositoryException
    {
        StringBuilder path = new StringBuilder(_root.getPath());
        if (path.length() > 0)
        {
            path.append('/');
        }
        
        path.append(_path);
        
        return path.toString();
    }

    @Override
    public String getPath() throws AmetysRepositoryException
    {
        return getParentPath() + "/" + _post.getName();
    }

    @Override
    public CompositeMetadata getMetadataHolder()
    {
        return new StaticCompositeMetadata();
    }

    @Override
    public Set<String> getTags() throws AmetysRepositoryException
    {
        return Collections.emptySet();
    }
    
    @Override
    public String getTemplate() throws AmetysRepositoryException
    {
        Skin skin = _skinsManager.getSkin(getSite().getSkinId());
        
        if (skin.getTemplate(BLOG_POST_TEMPLATE) != null)
        {
            return BLOG_POST_TEMPLATE;
        }
        
        return super.getTemplate(); 
    }

    @Override
    public boolean isVisible() throws AmetysRepositoryException
    {
        return true;
    }
}