package org.gcube.informationsystem.resourceregistry.types.properties;

import java.util.Map;
import java.util.UUID;

import org.gcube.com.fasterxml.jackson.databind.JsonNode;
import org.gcube.informationsystem.base.reference.AccessType;
import org.gcube.informationsystem.resourceregistry.api.exceptions.AlreadyPresentException;
import org.gcube.informationsystem.resourceregistry.api.exceptions.NotFoundException;
import org.gcube.informationsystem.resourceregistry.api.exceptions.ResourceRegistryException;
import org.gcube.informationsystem.resourceregistry.api.exceptions.types.SchemaAlreadyPresentException;
import org.gcube.informationsystem.resourceregistry.api.exceptions.types.SchemaNotFoundException;
import org.gcube.informationsystem.resourceregistry.api.exceptions.types.SchemaViolationException;
import org.gcube.informationsystem.resourceregistry.contexts.security.SecurityContext;
import org.gcube.informationsystem.resourceregistry.contexts.security.TypeSecurityContext;
import org.gcube.informationsystem.resourceregistry.instances.base.ElementManagement;
import org.gcube.informationsystem.resourceregistry.instances.base.ElementManagementUtility;
import org.gcube.informationsystem.resourceregistry.utils.DBUtility;
import org.gcube.informationsystem.types.reference.entities.EntityType;
import org.gcube.informationsystem.types.reference.properties.PropertyType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.arcadedb.database.Document;
import com.arcadedb.query.sql.executor.Result;
import com.arcadedb.query.sql.executor.ResultSet;
import com.arcadedb.remote.RemoteDatabase;

/**
 * @author Luca Frosini (ISTI - CNR)
 */
public class PropertyTypeDefinitionManagement extends ElementManagement<Document, PropertyType<?>> {
	
	private static Logger logger = LoggerFactory.getLogger(PropertyTypeDefinitionManagement.class);
	
	protected String name;
	
	public PropertyTypeDefinitionManagement() {
		super(AccessType.PROPERTY_TYPE);
		this.typeName = PropertyType.NAME;
	}
	
	public PropertyTypeDefinitionManagement(SecurityContext securityContext, RemoteDatabase database) throws ResourceRegistryException {
		this();
		this.database = database;
		setWorkingContext(securityContext);
	}
	
	@Override
	public Map<UUID,JsonNode> getAffectedInstances() {
		throw new UnsupportedOperationException();
	}
	
	@Override
	protected SecurityContext getWorkingContext() throws ResourceRegistryException {
		if(workingContext == null) {
			workingContext = TypeSecurityContext.getInstance();
		}
		return workingContext;
	}
	
	public void setName(String name) {
		this.name = name;
	}
	
	public String getName() {
		if(name == null) {
			if(element == null) {
				if(jsonNode != null) {
					name = jsonNode.get(PropertyType.NAME_PROPERTY).asText();
				}
			} else {
				name = element.getString(PropertyType.NAME_PROPERTY);
			}
		}
		return name;
	}
	
	@Override
	protected JsonNode createCompleteJsonNode() throws ResourceRegistryException {
		return serializeSelfAsJsonNode();
	}
	
	@Override
	protected Document reallyCreate() throws AlreadyPresentException, ResourceRegistryException {
		logger.debug("Going to create {} for {}", PropertyType.NAME, getName());
		return createElement();
	}
	
	@Override
	protected Document reallyUpdate() throws NotFoundException, ResourceRegistryException {
		logger.debug("Going to update {} for {}", PropertyType.NAME, getName());
		Document propertyTypeDefinition = getElement();
		propertyTypeDefinition = updateProperties(documentType, propertyTypeDefinition, jsonNode,
				ignoreKeys, ignoreStartWithKeys);
		return propertyTypeDefinition;
	}
	
	@Override
	protected void reallyDelete() throws NotFoundException, ResourceRegistryException {
		logger.debug("Going to remove {} for {}", EntityType.NAME, getName());
		getElement().delete();
	}
	
	@Override
	public Document getElement() throws NotFoundException, ResourceRegistryException {
		if(element == null) {
			try {
				element = retrieveElement();
			} catch(NotFoundException e) {
				throw e;
			} catch(ResourceRegistryException e) {
				throw e;
			} catch(Exception e) {
				throw new ResourceRegistryException(e);
			}
			
		} else {
			if(reload) {
				element.reload();
			}
		}
		return element;
	}
	
	@Override
	public Document retrieveElement() throws NotFoundException, ResourceRegistryException {
		try {
			if(getName() == null) {
				throw new NotFoundException("null name does not allow to retrieve the Element");
			}
			
			String select = "SELECT FROM " + typeName + " WHERE " + PropertyType.NAME_PROPERTY + " = \""
					+ getName() + "\"";
			
			ResultSet resultSet = database.query("sql", select);
			
			if(resultSet == null || !resultSet.hasNext()) {
				String error = String.format("No %s with name %s was found", typeName, getName());
				logger.info(error);
				throw new NotFoundException(error);
			}
			
			Result oResult = resultSet.next();
			Document element = (Document) ElementManagementUtility.getElementFromOptional(oResult.getElement());
			
			logger.trace("{} with id {} is : {}", typeName, getName(), DBUtility.getAsStringForLogging(element));
			
			if(resultSet.hasNext()) {
				throw new ResourceRegistryException("Found more than one " + typeName + " with name " + getName()
						+ ". This is a fatal error please contact Admnistrator");
			}
			
			return element;
		} catch(NotFoundException e) {
			throw getSpecificNotFoundException(e);
		} catch(ResourceRegistryException e) {
			throw e;
		} catch(Exception e) {
			throw new ResourceRegistryException(e);
		}
	}
	
	protected Document createElement() throws AlreadyPresentException, ResourceRegistryException {
		try {
			this.element = database.newDocument(typeName);
			
			updateProperties(documentType, element, jsonNode, ignoreKeys, ignoreStartWithKeys);
			
			logger.debug("Created {} is {}", PropertyType.NAME, DBUtility.getAsStringForLogging(element));
			
			return element;
		} catch(ResourceRegistryException e) {
			throw e;
		} catch(Exception e) {
			logger.trace("Error while creating {} for {} ({}) using {}", Document.class.getSimpleName(),
					accessType.getName(), typeName, jsonNode, e);
			throw new ResourceRegistryException("Error Creating " + typeName + " with " + jsonNode, e.getCause());
		}
	}
	
	@Override
	public String reallyGetAll(boolean polymorphic) throws ResourceRegistryException {
		throw new UnsupportedOperationException();
	}
	
	@Override
	protected NotFoundException getSpecificNotFoundException(NotFoundException e) {
		return new SchemaNotFoundException(e.getMessage(), e.getCause());
	}
	
	@Override
	protected AlreadyPresentException getSpecificAlreadyPresentException(String message) {
		return new SchemaAlreadyPresentException(message);
	}
	
	@Override
	public void sanityCheck() throws SchemaViolationException, ResourceRegistryException {
		// Nothing to do
	}
	
}