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package com.jpattern.orm;

import java.util.List;

import com.jpattern.logger.ILogger;
import com.jpattern.orm.classmapper.ClassMapperBuilder;
import com.jpattern.orm.classmapper.ClassTableMapBuilder;
import com.jpattern.orm.classmapper.IClassMapper;
import com.jpattern.orm.classmapper.TableMap;
import com.jpattern.orm.classtool.IOrmClassTool;
import com.jpattern.orm.classtool.IOrmClassToolMap;
import com.jpattern.orm.classtool.NullOrmClassToolMap;
import com.jpattern.orm.classtool.OrmClassTool;
import com.jpattern.orm.classtool.OrmClassToolMap;
import com.jpattern.orm.crud.IOrmCRUDQuery;
import com.jpattern.orm.crud.OrmCRUDQueryGenerator;
import com.jpattern.orm.dialect.DefaultDialect;
import com.jpattern.orm.dialect.Dialect;
import com.jpattern.orm.exception.OrmConfigurationException;
import com.jpattern.orm.generator.GeneratorStrategy;
import com.jpattern.orm.generator.IOrmPersistor;
import com.jpattern.orm.generator.ResultSetMethodHelper;
import com.jpattern.orm.generator.reflection.ReflectionGeneratorStrategy;
import com.jpattern.orm.generator.wrapper.TypeWrapper;
import com.jpattern.orm.logger.OrmLogger;
import com.jpattern.orm.session.Session;
import com.jpattern.orm.session.SessionProvider;
import com.jpattern.orm.session.NullSessionProvider;
import com.jpattern.orm.session.OrmSession;

/**
 * 
 * @author Francesco Cina'
 *
 * 26/ago/2011
 */
public class JPOrm implements JPO {

	private static Integer JPORM_INSTANCES_COUNT = Integer.valueOf(0);
	private SessionProvider sessionProvider;
	private IOrmClassToolMap ormClassToolMap = new OrmClassToolMap(this);
	private final ILogger logger = OrmLogger.getOrmLogger(this.getClass());
	private final Dialect dialect;
	private final GeneratorStrategy generatorStrategy;
	private final Integer instanceCount;
	private final ResultSetMethodHelper resultSetMethodHelper = new ResultSetMethodHelper();

	/**
	 * Create a new instance of JPOrm using the DefaultDialect (compatible with Oracle and H2 dbs).
	 * This instance can be obtained everywhere in the application using
	 * the static method get(String jpOrmName)
	 * 
	 * @param sessionProvider
	 */
	public JPOrm(final SessionProvider sessionProvider) {
		this( sessionProvider, new DefaultDialect());
	}

	/**
	 * Create a new instance of JPOrm.
	 * 
	 * @param sessionProvider
	 * @param dialect
	 */
	public JPOrm(final SessionProvider sessionProvider, final Dialect dialect) {
		this( sessionProvider, dialect, new ReflectionGeneratorStrategy());
	}

	/**
	 * Create a new instance of JPOrm.
	 * 
	 * @param sessionProvider
	 * @param dialect
	 * @param generatorStrategy
	 */
	public JPOrm(final SessionProvider sessionProvider, final Dialect dialect, final GeneratorStrategy generatorStrategy) {
		synchronized (JPORM_INSTANCES_COUNT) {
			this.instanceCount = JPORM_INSTANCES_COUNT++;
		}
		this.sessionProvider = sessionProvider;
		this.dialect = dialect;
		this.generatorStrategy = generatorStrategy;
	}

	@Override
	public final Session session() {
		return new OrmSession(this.ormClassToolMap, this.sessionProvider.getSessionStrategy() );
	}

	@Override
	public  void register(final Class clazz) throws OrmConfigurationException {
		this.logger.info("register", "register new class: " + clazz.getName());
		try {
			final TableMap tableMap = new TableMap();
			new ClassTableMapBuilder(clazz, tableMap).updateTableMap();
			final IClassMapper classMapper = new ClassMapperBuilder(clazz, tableMap).generate();
			final IOrmPersistor ormPersistor = this.generatorStrategy.getGenerator(classMapper, "" + this.instanceCount, this.resultSetMethodHelper).generate();
			final IOrmCRUDQuery ormCRUDQuery = new OrmCRUDQueryGenerator(this.dialect, classMapper).generate();
			final IOrmClassTool ormClassTool = new OrmClassTool(classMapper, ormPersistor, ormCRUDQuery);
			this.ormClassToolMap.put(clazz, ormClassTool);
		} catch (final Exception e) {
			throw new OrmConfigurationException(e);
		}
	}

	@Override
	public void destory() {
		this.sessionProvider = new NullSessionProvider();
		this.ormClassToolMap = new NullOrmClassToolMap();
	}

	@Override
	public void register(final List> classes) throws OrmConfigurationException {
		for (final Class clazz : classes) {
			this.register(clazz);
		}
	}

	public SessionProvider getSessionProvider() {
		return this.sessionProvider;
	}

	public ResultSetMethodHelper getResultSetMethodHelper() {
		return this.resultSetMethodHelper;
	}

	@Override
	public void register(final TypeWrapper typeWrapper) throws OrmConfigurationException {
		try {
			this.resultSetMethodHelper.addWrappers(typeWrapper);
		} catch (Exception e) {
			throw new OrmConfigurationException(e);
		}
	}

}