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

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.model.reference.relations.Relation;
import org.gcube.informationsystem.resourceregistry.api.exceptions.AlreadyPresentException;
import org.gcube.informationsystem.resourceregistry.api.exceptions.AvailableInAnotherContextException;
import org.gcube.informationsystem.resourceregistry.api.exceptions.NotFoundException;
import org.gcube.informationsystem.resourceregistry.api.exceptions.ResourceRegistryException;
import org.gcube.informationsystem.resourceregistry.api.exceptions.relations.RelationNotFoundException;
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.ElementManagementUtility;
import org.gcube.informationsystem.resourceregistry.instances.base.relations.RelationElementManagement;
import org.gcube.informationsystem.resourceregistry.types.entities.EntityTypeDefinitionManagement;
import org.gcube.informationsystem.resourceregistry.types.entities.ResourceTypeDefinitionManagement;
import org.gcube.informationsystem.resourceregistry.utils.DBUtility;
import org.gcube.informationsystem.types.reference.entities.EntityType;
import org.gcube.informationsystem.types.reference.entities.ResourceType;
import org.gcube.informationsystem.types.reference.relations.RelationType;

import com.arcadedb.graph.Edge;
import com.arcadedb.graph.Vertex;
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 abstract class RelationTypeDefinitionManagement<T extends EntityTypeDefinitionManagement<TT>, TT extends EntityType>
		extends RelationElementManagement<ResourceTypeDefinitionManagement, T, ResourceType, TT> {

	protected String name;

	public RelationTypeDefinitionManagement(Class<TT> clz) {
		super(AccessType.RELATION_TYPE, ResourceType.class, clz);
		this.typeName = RelationType.NAME;
		this.forceIncludeAllMeta = true;
	}

	public RelationTypeDefinitionManagement(SecurityContext securityContext, RemoteDatabase database,
			Class<TT> clz) throws ResourceRegistryException {
		this(clz);
		this.database = database;
		setWorkingContext(securityContext);
	}

	@Override
	public Map<UUID,JsonNode> getAffectedInstances() {
		throw new UnsupportedOperationException();
	}
	
	@Override
	protected SecurityContext getWorkingContext() throws ResourceRegistryException {
		if (workingContext == null) {
			this.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(RelationType.NAME_PROPERTY).asText();
				}
			} else {
				name = element.getString(RelationType.NAME_PROPERTY);
			}
		}
		return name;
	}

	@Override
	protected Edge reallyCreate() throws ResourceRegistryException {
		logger.debug("Going to create {} for {}", RelationType.NAME, getName());
		if (sourceEntityManagement == null) {
			if (!jsonNode.has(Relation.SOURCE_PROPERTY)) {
				throw new ResourceRegistryException("Error while creating relation. No source definition found");
			}

			sourceEntityManagement = newSourceEntityManagement();
			// sourceEntityManagement.setElementType(EntityTypeDefinition.NAME);
			sourceEntityManagement.setJsonNode(jsonNode.get(Relation.SOURCE_PROPERTY));
		}

		if (targetEntityManagement == null) {
			if (!jsonNode.has(Relation.TARGET_PROPERTY)) {
				throw new ResourceRegistryException(
						"Error while creating " + typeName + ". No target definition found");
			}

			targetEntityManagement = newTargetEntityManagement();
			// targetEntityManagement.setElementType(EntityTypeDefinition.NAME);
			targetEntityManagement.setJsonNode(jsonNode.get(Relation.TARGET_PROPERTY));
		}

		Vertex source = (Vertex) getSourceEntityManagement().getElement();
		Vertex target = (Vertex) getTargetEntityManagement().getElement();

		logger.trace("Creating {} beetween {} -> {}", typeName, source.toString(), target.toString());

		element = source.newEdge(typeName, target, true);

		updateProperties(documentType, element, jsonNode, ignoreKeys, ignoreStartWithKeys);

		return element;
	}

	@Override
	protected Edge reallyUpdate() throws NotFoundException, ResourceRegistryException {
		logger.debug("Going to update {} for {}", RelationType.NAME, getName());
		Edge relationTypeDefinition = getElement();
		relationTypeDefinition = (Edge) updateProperties(documentType, relationTypeDefinition, jsonNode, ignoreKeys,
				ignoreStartWithKeys);
		return relationTypeDefinition;

	}

	@Override
	protected void reallyDelete() throws RelationNotFoundException, ResourceRegistryException {
		logger.debug("Going to remove {} for {}", RelationType.NAME, getName());
		getElement().delete();
	}

	@Override
	public Edge 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 Edge 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 " + RelationType.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();
			Edge element = (Edge) 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);
		}
	}

	@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
	protected ResourceTypeDefinitionManagement newSourceEntityManagement() throws ResourceRegistryException {
		ResourceTypeDefinitionManagement rtdm = new ResourceTypeDefinitionManagement();
		rtdm.setWorkingContext(getWorkingContext());
		rtdm.setDatabase(database);
		return rtdm;
	}
	
	@Override
	protected void checksourceAndTargetEntityCompliancy() throws NotFoundException, AvailableInAnotherContextException,
			SchemaViolationException, ResourceRegistryException {
		// The compliancy is ensured by the code
	}

}