package org.gcube.application.perform.service.engine;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.UUID;

import org.gcube.application.perform.service.LocalConfiguration;
import org.gcube.application.perform.service.engine.model.BeanNotFound;
import org.gcube.application.perform.service.engine.model.DBField;
import org.gcube.application.perform.service.engine.model.DBQueryDescriptor;
import org.gcube.application.perform.service.engine.model.ISQueryDescriptor;
import org.gcube.application.perform.service.engine.model.InternalException;
import org.gcube.application.perform.service.engine.model.InvalidRequestException;
import org.gcube.application.perform.service.engine.model.anagraphic.Batch;
import org.gcube.application.perform.service.engine.model.anagraphic.Farm;

import lombok.Synchronized;
import lombok.extern.slf4j.Slf4j;

@Slf4j
public class MappingManagerImpl implements MappingManager {
	
	private static ISQueryDescriptor isQueryDescriptor=null;
	
	
	
	
	@Synchronized
	private static ISQueryDescriptor getISQueryDescriptor() {
		if(isQueryDescriptor==null) {
			isQueryDescriptor=
					new ISQueryDescriptor( 
							LocalConfiguration.getProperty(LocalConfiguration.MAPPING_DB_ENDPOINT_NAME), null,
							LocalConfiguration.getProperty(LocalConfiguration.MAPPING_DB_ENDPOINT_CATEGORY));
		}
		return isQueryDescriptor;		
	}
	
	
	@Override
	public Batch getBatch(DBQueryDescriptor desc) throws SQLException, InternalException{		
		DataBaseManager db=DataBaseManager.get(getISQueryDescriptor());
		Connection conn=db.getConnection();
		Query getQuery=Queries.GET_BATCH_BY_DESCRIPTIVE_KEY;
		PreparedStatement psSearch=getQuery.get(conn, desc);	
		
		ResultSet rs=psSearch.executeQuery();
		
		if(rs.next())
			return Queries.rowToBatch(rs);
		
		// ID NOT FOUND, TRY TO REGISTER IT
		
			log.trace("Registering new Batch from condition {}",desc);
			PreparedStatement psInsert=Queries.INSERT_BATCH.get(conn, desc);
						
			boolean inserted=psInsert.executeUpdate()==1;
			if(inserted) {
				conn.commit();
				log.trace("Committed Batch.");
			}
			rs=psSearch.executeQuery();
			
			if(rs.next())
				return Queries.rowToBatch(rs);
			else throw new BeanNotFound(String.format("Unable to find Bean with ",desc));
		
	}

	@Override
	public Farm getFarm(DBQueryDescriptor desc)  throws SQLException, InternalException{
		DataBaseManager db=DataBaseManager.get(getISQueryDescriptor());
			
		
		Connection conn=db.getConnection();
		PreparedStatement psGet=null;
		DBField IDField=DBField.Farm.fields.get(DBField.Farm.FARM_ID);
		if(desc.getCondition().containsKey(IDField)) {			
			psGet=Queries.GET_FARM_BY_ID.get(conn, desc);
		}

			ResultSet rs=psGet.executeQuery();
			if(!rs.next())
				throw new BeanNotFound("Farm not found. Condition was "+desc);
			
			return Queries.rowToFarm(rs);
	}

	
	
	
}