/**
 * 
 */
package org.gcube.portlets.widgets.wsexplorer.server;

import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.gcube.common.homelibary.model.items.type.WorkspaceItemType;
import org.gcube.common.homelibrary.home.exceptions.InternalErrorException;
import org.gcube.common.homelibrary.home.workspace.WorkspaceFolder;
import org.gcube.common.homelibrary.home.workspace.WorkspaceItem;
import org.gcube.common.homelibrary.home.workspace.WorkspaceSharedFolder;
import org.gcube.common.homelibrary.home.workspace.folder.FolderItem;
import org.gcube.common.homelibrary.home.workspace.folder.items.ExternalFile;
import org.gcube.portlets.widgets.wsexplorer.client.Util;
import org.gcube.portlets.widgets.wsexplorer.client.WorkspaceExplorerConstants;
import org.gcube.portlets.widgets.wsexplorer.shared.FilterCriteria;
import org.gcube.portlets.widgets.wsexplorer.shared.Item;
import org.gcube.portlets.widgets.wsexplorer.shared.ItemType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * The Class ItemBuilder.
 *
 * @author Federico De Faveri defaveri@isti.cnr.it
 * Modified by Francesco Mangiacrapa francesco.mangiacrapa@isti.cnr.it
 */
public class ItemBuilder {
	
	public static final Logger _log = LoggerFactory.getLogger(ItemBuilder.class);
	/**
	 * Purge empty folders.
	 *
	 * @param item the item
	 * @return the item
	 */
	public static Item purgeEmptyFolders(Item item)
	{
		//for (Item child:item.getChildren()) purgeEmptyFolders(child); ONLY FIRST LEVEL
		
		List<Item> toRemoveList = new LinkedList<Item>();
		for (Item child:item.getChildren()) {
			boolean toRemove = isAnEmptyFolder(child);
			if (toRemove) toRemoveList.add(child);
		}
		for (Item child:toRemoveList) item.removeChild(child);
		
		return item;
	}
	
	
	/**
	 * Checks if is an empty folder.
	 *
	 * @param item the item
	 * @return true, if is an empty folder
	 */
	protected static boolean isAnEmptyFolder(Item item)
	{
		return Util.isFolder(item.getType()) && item.getChildren().size() == 0;
	}
	
	/**
	 * Gets the item
	 *
	 * @param parent the parent
	 * @param workspaceItem the workspace item
	 * @param showableTypes the showable types
	 * @param filterCriteria the filter criteria
	 * @param loadChildren the load children
	 * @return the item
	 * @throws InternalErrorException the internal error exception
	 */
	public static Item getItem(Item parent, WorkspaceItem workspaceItem, List<ItemType> showableTypes, FilterCriteria filterCriteria, boolean loadChildren) throws InternalErrorException
	{
		
		ItemType type = getItemType(workspaceItem);
		
		if (!showableTypes.contains(type)) return null;
		if (!filterItem(type, workspaceItem, filterCriteria)) return null;
		
		String itemName =  workspaceItem.getName();
		_log.info("Building Item for: "+itemName);
		
//		//TODO ADD CONTROL ON THE PATH WHEN WILL BE MORE FAST
//		if (itemName.equals(WorkspaceExplorerConstants.SPECIAL_FOLDERS_LABEL))
//			itemName = WorkspaceExplorerConstants.VRE_FOLDERS_LABEL;
		
		boolean isFolder = false;
		if(type.equals(ItemType.FOLDER))
			isFolder = true;
		
		//TODO ADD GET PATH WHEN WILL BE MORE FAST
		Item item = new Item(parent, workspaceItem.getId(), itemName, type, "", UserUtil.getUserFullName(workspaceItem.getOwner().getPortalLogin()), isFolder, false);
		item.setSharedFolder(workspaceItem.getType().equals(WorkspaceItemType.SHARED_FOLDER));
		
		if(loadChildren){
			for (WorkspaceItem child: workspaceItem.getChildren()){
				_log.info("Converting child item: "+itemName);
				Item itemChild = getItem(item, child, showableTypes, filterCriteria, false);		
				_log.info("Item: "+itemName +" converted!!!");
				if (itemChild!=null){
					item.addChild(itemChild);
				}
			}
		}
		
		return item;
	}

	/**
	 * Gets the item type.
	 *
	 * @param item the item
	 * @return the item type
	 * @throws InternalErrorException the internal error exception
	 */
	protected static ItemType getItemType(WorkspaceItem item) throws InternalErrorException
	{
		switch(item.getType())
		{
			case SHARED_FOLDER:
			case FOLDER:{
//				if (item.isRoot()) return ItemType.ROOT;
				return ItemType.FOLDER;
			}
			case FOLDER_ITEM: return getFolderItemType((FolderItem) item);
			
			default:
				return null;
		}
	}
	
	/**
	 * Gets the folder item type.
	 *
	 * @param item the item
	 * @return the folder item type
	 */
	protected static ItemType getFolderItemType(FolderItem item){
		
		try{
			return ItemType.valueOf(item.getFolderItemType().toString());
		}catch (Exception e) {
			_log.error("Item Type non found: ",e);
			return ItemType.UNKNOWN_TYPE;
		}
	}
	
	/**
	 * Filter item.
	 *
	 * @param type the type
	 * @param item the item
	 * @param filterCriteria the filter criteria
	 * @return true, if successful
	 * @throws InternalErrorException the internal error exception
	 */
	protected static boolean filterItem(ItemType type, WorkspaceItem item, FilterCriteria filterCriteria) throws InternalErrorException {
		boolean mimeTypeCheck = checkAllowedMimeTypes(type, item, filterCriteria.getAllowedMimeTypes());
		if (!mimeTypeCheck) return false;
		
		boolean propertiesCheck = checkProperties(item, filterCriteria.getRequiredProperties());		
		return propertiesCheck;
	}
	
	/**
	 * Check allowed mime types.
	 *
	 * @param type the type
	 * @param item the item
	 * @param allowedMimeTypes the allowed mime types
	 * @return true, if successful
	 */
	protected static boolean checkAllowedMimeTypes(ItemType type, WorkspaceItem item, List<String> allowedMimeTypes){
		if (allowedMimeTypes.size()==0) return true;
		
		if (type == ItemType.EXTERNAL_FILE || type == ItemType.EXTERNAL_IMAGE || type == ItemType.EXTERNAL_PDF_FILE) {
			ExternalFile externalFile = (ExternalFile)item;
			String mimeType = externalFile.getMimeType();
			return allowedMimeTypes.contains(mimeType);
		}
		return true;
	}
	
	
	/**
	 * Check properties.
	 *
	 * @param item the item
	 * @param requestedProperties the requested properties
	 * @return true, if successful
	 * @throws InternalErrorException the internal error exception
	 */
	protected static boolean checkProperties(WorkspaceItem item, Map<String, String> requestedProperties) throws InternalErrorException
	{
		if (requestedProperties.size()==0 || item.getType()!=WorkspaceItemType.FOLDER_ITEM) return true;
		
		Map<String, String> itemProperties = item.getProperties().getProperties();
		for (Entry<String, String> requestProperty:requestedProperties.entrySet()) {
			String propertyValue = itemProperties.get(requestProperty.getKey());
			if (propertyValue == null) return false;
			if (!propertyValue.equals(requestProperty.getValue())) return false;
		}
		
		return true;
	}
	


	/**
	 * Builds the folder to breadcrumbs.
	 *
	 * @param wsFolder the ws folder
	 * @param parent the parent
	 * @return the item
	 * @throws InternalErrorException the internal error exception
	 */
	protected static Item buildFolderForBreadcrumbs(WorkspaceFolder wsFolder, Item parent) throws InternalErrorException {
		
		String name = "";
		boolean isSpecialFolder = false;
		boolean isRoot = false;

		if(wsFolder.isRoot()){ //IS ROOT
			name = WorkspaceExplorerConstants.HOME_LABEL;
			isRoot = true;
		}else if(wsFolder.isShared() && wsFolder.getType().equals(WorkspaceItemType.SHARED_FOLDER)){ 		//MANAGEMENT SHARED FOLDER NAME
	    	WorkspaceSharedFolder shared = (WorkspaceSharedFolder) wsFolder;
	    	name = shared.isVreFolder()?shared.getDisplayName():wsFolder.getName();
	    	//MANAGEMENT SPECIAL FOLDER
		}else if(isSpecialFolder(wsFolder)){
			name = WorkspaceExplorerConstants.VRE_FOLDERS_LABEL;
			isSpecialFolder = true;
		}else
			name = wsFolder.getName();
		
		//BUILDS A SIMPLE ITEM FOR BREADCRUMB
		Item item = new Item(null, wsFolder.getId(), name, ItemType.FOLDER, "", null, true, isRoot);
		item.setSpecialFolder(isSpecialFolder);
		
		_log.debug("breadcrumb returning: "+item);
		return item;
	}
	
	public static boolean isSpecialFolder(WorkspaceFolder wsFolder){
		
		try {
			return (wsFolder.getName().compareTo(WorkspaceExplorerConstants.SPECIAL_FOLDERS_NAME)==0 && wsFolder.getParent()!=null && wsFolder.getParent().isRoot());
		} catch (InternalErrorException e) {
			_log.warn("isSpecialFolder exception, returning false");
			return false;
		}
	}
}