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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or .
 */
package org.hibernate.sql;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;

import org.hibernate.dialect.Dialect;
import org.hibernate.type.LiteralType;

/**
 * An SQL UPDATE statement
 *
 * @author Gavin King
 */
public class Update {

	protected String tableName;
	protected String versionColumnName;
	protected String where;
	protected String assignments;
	protected String comment;

	protected Map primaryKeyColumns = new LinkedHashMap<>();
	protected Map columns = new LinkedHashMap<>();
	protected Map whereColumns = new LinkedHashMap<>();
	
	private Dialect dialect;
	
	public Update(Dialect dialect) {
		this.dialect = dialect;
	}

	public String getTableName() {
		return tableName;
	}

	public Update appendAssignmentFragment(String fragment) {
		if ( assignments == null ) {
			assignments = fragment;
		}
		else {
			assignments += ", " + fragment;
		}
		return this;
	}

	public Update setTableName(String tableName) {
		this.tableName = tableName;
		return this;
	}

	public Update setPrimaryKeyColumnNames(String[] columnNames) {
		this.primaryKeyColumns.clear();
		addPrimaryKeyColumns(columnNames);
		return this;
	}	
	
	public Update addPrimaryKeyColumns(String[] columnNames) {
		for ( String columnName : columnNames ) {
			addPrimaryKeyColumn( columnName, "?" );
		}
		return this;
	}
	
	public Update addPrimaryKeyColumns(String[] columnNames, boolean[] includeColumns, String[] valueExpressions) {
		for ( int i=0; i> iter = columns.entrySet().iterator();
		while ( iter.hasNext() ) {
			Map.Entry e = iter.next();
			buf.append( e.getKey() ).append( '=' ).append( e.getValue() );
			if ( iter.hasNext() ) {
				buf.append( ", " );
			}
			assignmentsAppended = true;
		}
		if ( assignments != null ) {
			if ( assignmentsAppended ) {
				buf.append( ", " );
			}
			buf.append( assignments );
		}

		boolean conditionsAppended = false;
		if ( !primaryKeyColumns.isEmpty() || where != null || !whereColumns.isEmpty() || versionColumnName != null ) {
			buf.append( " where " );
		}
		iter = primaryKeyColumns.entrySet().iterator();
		while ( iter.hasNext() ) {
			Map.Entry e = iter.next();
			buf.append( e.getKey() ).append( '=' ).append( e.getValue() );
			if ( iter.hasNext() ) {
				buf.append( " and " );
			}
			conditionsAppended = true;
		}
		if ( where != null ) {
			if ( conditionsAppended ) {
				buf.append( " and " );
			}
			buf.append( where );
			conditionsAppended = true;
		}
		iter = whereColumns.entrySet().iterator();
		while ( iter.hasNext() ) {
			final Map.Entry e = iter.next();
			if ( conditionsAppended ) {
				buf.append( " and " );
			}
			buf.append( e.getKey() ).append( e.getValue() );
			conditionsAppended = true;
		}
		if ( versionColumnName != null ) {
			if ( conditionsAppended ) {
				buf.append( " and " );
			}
			buf.append( versionColumnName ).append( "=?" );
		}

		return buf.toString();
	}
}