/*
 *  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.userdirectory.page;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;

import javax.jcr.Node;
import javax.jcr.RepositoryException;
import javax.jcr.Value;

import org.apache.commons.lang.StringUtils;

import org.ametys.cms.repository.Content;
import org.ametys.cms.repository.DefaultContent;
import org.ametys.core.group.GroupIdentity;
import org.ametys.core.right.RightManager;
import org.ametys.core.user.UserIdentity;
import org.ametys.plugins.contentio.synchronize.SynchronizableContentsCollection;
import org.ametys.plugins.contentio.synchronize.SynchronizableContentsCollectionDAO;
import org.ametys.plugins.explorer.resources.ResourceCollection;
import org.ametys.plugins.repository.ACLAmetysObject;
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.CollectionIterable;
import org.ametys.plugins.repository.UnknownAmetysObjectException;
import org.ametys.plugins.repository.metadata.CompositeMetadata;
import org.ametys.plugins.userdirectory.UserDirectoryPageHandler;
import org.ametys.web.repository.page.Page;
import org.ametys.web.repository.page.UnknownZoneException;
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 second-level page.
 */
public class UserPage implements Page, ACLAmetysObject
{
    private static final String __USER_PAGE_TEMPLATE = "user-page";
    
    private Page _root;
    private int _initialDepth;
    private String _title;
    private AmetysObjectResolver _resolver;
    private UserDirectoryPageHandler _userDirectoryPageHandler;
    private SynchronizableContentsCollectionDAO _syncContentsCollectionDAO;
    private SkinsManager _skinsManager;
    private String _path;
    private Content _syncContent;


    
    /**
     * Constructor.
     * @param root the root page.
     * @param syncContent the synchronized content
     * @param path the path
     * @param resolver the {@link AmetysObjectResolver}.
     * @param userDirectoryPageHandler the user directory page handler
     * @param syncContentsCollectionDAO The DAO for synchronizable collections
     * @param skinsManager the skins manager
     */
    public UserPage(Page root, Content syncContent, String path, AmetysObjectResolver resolver, UserDirectoryPageHandler userDirectoryPageHandler, SynchronizableContentsCollectionDAO syncContentsCollectionDAO, SkinsManager skinsManager)
    {
        _root = root;
        _path = path;
        _resolver = resolver;
        _userDirectoryPageHandler = userDirectoryPageHandler;
        _syncContentsCollectionDAO = syncContentsCollectionDAO;
        _skinsManager = skinsManager;
        _syncContent = syncContent;
        
        _title = _syncContent.getTitle(new Locale(root.getSitemapName()));
        _initialDepth = _userDirectoryPageHandler.getDepth(_root);
    }

    /**
     * Compute a page id
     * @param path The path
     * @param rootId The root page id
     * @param contentId The content id
     * @return The id
     */
    public static String getId(String path, String rootId, String contentId)
    {
        // E.g: uduser://path?rootId=...&contentId=...
        return "uduser://" + path + "?rootId=" + rootId + "&contentId=" + contentId;
    }
    
    /**
     * Returns the associated synchronizable {@link Content}.
     * @return the associated synchronizable {@link Content}.
     */
    public Content getSyncContent()
    {
        return _syncContent;
    }
    
    @Override
    public int getDepth() throws AmetysRepositoryException
    {
        return _root.getDepth() + _initialDepth + 1;
    }

    @Override
    public Set<String> getReferers() throws AmetysRepositoryException
    {
        return null;
    }

    @Override
    public ResourceCollection getRootAttachments() throws AmetysRepositoryException
    {
        return null;
    }

    @Override
    public String getTemplate() throws AmetysRepositoryException
    {
        Skin skin = _skinsManager.getSkin(getSite().getSkinId());
        
        if (skin.getTemplate(__USER_PAGE_TEMPLATE) != null)
        {
            return __USER_PAGE_TEMPLATE;
        }
        
        return "page"; 
    }

    @Override
    public String getTitle() throws AmetysRepositoryException
    {
        return _title;
    }
    
    @Override
    public String getLongTitle() throws AmetysRepositoryException
    {
        return _title;
    }

    @Override
    public PageType getType() throws AmetysRepositoryException
    {
        return PageType.CONTAINER;
    }

    @Override
    public String getURL() throws AmetysRepositoryException
    {
        throw new UnsupportedOperationException("#getURL is not supported on virtual user pages");
    }

    @Override
    public LinkType getURLType() throws AmetysRepositoryException
    {
        throw new UnsupportedOperationException("#getURLType is not supported on virtual user pages");
    }

    @Override
    public Zone getZone(String name) throws UnknownZoneException, AmetysRepositoryException
    {
        if (!"default".equals(name))
        {
            throw new IllegalArgumentException("Only the zone named 'default' is actually supported on virtual user pages.");
        }
        
        return new UserZone(this);
    }

    @Override
    public AmetysObjectIterable< ? extends Zone> getZones() throws AmetysRepositoryException
    {
        ArrayList<Zone> zones = new ArrayList<>();
        zones.add(new UserZone(this));
        return new CollectionIterable<>(zones);
    }

    @Override
    public boolean hasZone(String name) throws AmetysRepositoryException
    {
        return "default".equals(name);
    }

    @Override
    public AmetysObjectIterable<? extends Page> getChildrenPages() throws AmetysRepositoryException
    {
        ArrayList<Page> children = new ArrayList<>();
        return new CollectionIterable<>(children);
    }

    @Override
    public String getPathInSitemap() throws AmetysRepositoryException
    {
        if (_path.equals("_root"))
        {
            return _root.getPathInSitemap() + "/" + getName();
        }
        else
        {
            String path = StringUtils.lowerCase(_path);
            return _root.getPathInSitemap() + "/" + path + "/" + getName();
        }
    }

    @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
    {
        if (path.isEmpty())
        {
            throw new AmetysRepositoryException("path must be non empty");
        }
        
        return null;
    }

    @SuppressWarnings("unchecked")
    @Override
    public AmetysObjectIterable<? extends AmetysObject> getChildren() throws AmetysRepositoryException
    {
        return getChildrenPages();
    }

    @Override
    public boolean hasChild(String name) throws AmetysRepositoryException
    {
        return false;
    }
    
    @Override
    public String getId() throws AmetysRepositoryException
    {
        return getId(_path, _root.getId(), _syncContent.getId());
    }

    @Override
    public String getName() throws AmetysRepositoryException
    {
        return _syncContent.getName();
    }
    
    @SuppressWarnings("unchecked")
    @Override
    public Page getParent() throws AmetysRepositoryException
    {
        if (_initialDepth > 0)
        {
            String pathName = StringUtils.substringAfterLast(_path, "/");
            String name = _userDirectoryPageHandler.getName(pathName);
            return new TransitionalPage(_root, name, _path, _resolver, _userDirectoryPageHandler, _syncContentsCollectionDAO, _skinsManager);
        }
        else
        {
            return _root;
        }
    }

    @Override
    public String getParentPath() throws AmetysRepositoryException
    {
        if (_initialDepth > 0)
        {
            String path = StringUtils.lowerCase(_path);
            return _root.getPath() + "/" + path;
        }
        else
        {
            return _root.getPath();
        }
    }

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

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

    @Override
    public Set<String> getTags() throws AmetysRepositoryException
    {
        return Collections.emptySet();
    }

    @Override
    public AmetysObjectIterable< ? extends Page> getChildrenPages(boolean includeInvisiblePage) throws AmetysRepositoryException
    {
        ArrayList<Page> children = new ArrayList<>();
        return new CollectionIterable<>(children);
    }

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

    @Override
    public Page getChildPageAt(int index) throws UnknownAmetysObjectException, AmetysRepositoryException
    {
        throw new UnknownAmetysObjectException("There is no child for user page");
    }

    @Override
    public Set<String> getAllowedProfilesForAnyConnectedUser()
    {
        return Collections.EMPTY_SET;
    }

    @Override
    public Set<String> getDeniedProfilesForAnyConnectedUser()
    {
        return Collections.EMPTY_SET;
    }
    
    @Override
    public Set<String> getAllowedProfilesForAnonymous()
    {
        return Collections.EMPTY_SET;
    }

    @Override
    public Set<String> getDeniedProfilesForAnonymous()
    {
        List<String> collectionIds = _getCollectionIds();
        for (String collectionId : collectionIds)
        {
            SynchronizableContentsCollection collection = _syncContentsCollectionDAO.getSynchronizableContentsCollection(collectionId);
            String restrictedField = collection.getRestrictedField();
            if (!StringUtils.isEmpty(restrictedField) && _isContentRestricted(restrictedField))
            {
                return Collections.singleton(RightManager.READER_PROFILE_ID);
            }
        }
        return Collections.EMPTY_SET;
    }

    @Override
    public Set<String> getAllowedProfilesForUser(UserIdentity user)
    {
        return Collections.EMPTY_SET;
    }

    @Override
    public Map<UserIdentity, Set<String>> getAllowedProfilesForUsers()
    {
        return Collections.EMPTY_MAP;
    }

    @Override
    public Set<UserIdentity> getAllowedUsers(String profileId)
    {
        return Collections.EMPTY_SET;
    }

    @Override
    public Map<GroupIdentity, Set<String>> getAllowedProfilesForGroups()
    {
        return Collections.EMPTY_MAP;
    }

    @Override
    public Set<GroupIdentity> getAllowedGroups(String profileId)
    {
        return Collections.EMPTY_SET;
    }
    
    @Override
    public Set<String> getDeniedProfilesForUser(UserIdentity user)
    {
        return Collections.EMPTY_SET;
    }

    @Override
    public Map<UserIdentity, Set<String>> getDeniedProfilesForUsers()
    {
        return Collections.EMPTY_MAP;
    }

    @Override
    public Set<UserIdentity> getDeniedUsers(String profileId)
    {
        return Collections.EMPTY_SET;
    }

    @Override
    public Map<GroupIdentity, Set<String>> getDeniedProfilesForGroups()
    {
        return Collections.EMPTY_MAP;
    }

    @Override
    public Set<GroupIdentity> getDeniedGroups(String profileId)
    {
        return Collections.EMPTY_SET;
    }
    
    private boolean _isContentRestricted (String metadataPath)
    {
        CompositeMetadata metadataHolder = _syncContent.getMetadataHolder();
        
        String[] pathSegments = metadataPath.split("/");
        
        for (int i = 0;  i < pathSegments.length - 1; i++)
        {
            if (!metadataHolder.hasMetadata(pathSegments[i]))
            {
                return false;
            }
            metadataHolder = metadataHolder.getCompositeMetadata(pathSegments[i]);
        }
        
        String metadataName = pathSegments[pathSegments.length - 1];
        return metadataHolder.getBoolean(metadataName, false);
    }
    
    private List<String> _getCollectionIds() throws AmetysRepositoryException
    {
        List<String> collectionIds = new ArrayList<>();
        
        if (_syncContent instanceof DefaultContent)
        {
            try
            {
                Node node = ((DefaultContent) _syncContent).getNode();
                if (node.hasProperty(SynchronizableContentsCollection.COLLECTION_ID_PROPERTY))
                {
                    Value[] values = node.getProperty(SynchronizableContentsCollection.COLLECTION_ID_PROPERTY).getValues();
                    for (Value value : values)
                    {
                        collectionIds.add(value.getString());
                    }
                }
            }
            catch (RepositoryException e)
            {
                throw new AmetysRepositoryException("Failed to get linked synchronizable collections for content " + _syncContent.getId(), e);
            }
        }
        
        return collectionIds;
    }
}