/*
 * JBoss, Home of Professional Open Source.
 * See the COPYRIGHT.txt file distributed with this work for information
 * regarding copyright ownership.  Some portions may be licensed
 * to Red Hat, Inc. under one or more contributor license agreements.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */

package org.teiid.translator.jdbc.hsql;

import java.sql.Date;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.List;

import org.teiid.language.Command;
import org.teiid.language.DerivedColumn;
import org.teiid.language.Select;
import org.teiid.translator.ExecutionContext;
import org.teiid.translator.SourceSystemFunctions;
import org.teiid.translator.Translator;
import org.teiid.translator.TranslatorException;
import org.teiid.translator.jdbc.ConvertModifier;
import org.teiid.translator.jdbc.FunctionModifier;
import org.teiid.translator.jdbc.JDBCExecutionFactory;
import org.teiid.util.Version;

@Translator(name="hsql", description="A translator for open source HSQL Database")
public class HsqlExecutionFactory extends JDBCExecutionFactory {
	
	public static Version TWO_0 = Version.getVersion("2.0"); //$NON-NLS-1$
	
	@Override
	public void start() throws TranslatorException {
		super.start();
		registerFunctionModifier(SourceSystemFunctions.TIMESTAMPADD, new AddDiffModifier(true, getLanguageFactory()));
		registerFunctionModifier(SourceSystemFunctions.TIMESTAMPDIFF, new AddDiffModifier(false, getLanguageFactory())); 
	
		ConvertModifier convert = new ConvertModifier();
		convert.addTypeMapping("boolean", FunctionModifier.BOOLEAN); //$NON-NLS-1$
		convert.addTypeMapping("tinyint", FunctionModifier.BYTE); //$NON-NLS-1$
		convert.addTypeMapping("smallint", FunctionModifier.SHORT); //$NON-NLS-1$
		convert.addTypeMapping("int", FunctionModifier.INTEGER); //$NON-NLS-1$
		convert.addTypeMapping("bigint", FunctionModifier.LONG); //$NON-NLS-1$
		convert.addTypeMapping("real", FunctionModifier.FLOAT); //$NON-NLS-1$
		convert.addTypeMapping("double", FunctionModifier.DOUBLE); //$NON-NLS-1$
		convert.addTypeMapping("decimal", FunctionModifier.BIGDECIMAL); //$NON-NLS-1$
		convert.addTypeMapping("decimal(38,0)", FunctionModifier.BIGINTEGER); //$NON-NLS-1$
		convert.addTypeMapping("date", FunctionModifier.DATE); //$NON-NLS-1$
		convert.addTypeMapping("time", FunctionModifier.TIME); //$NON-NLS-1$
		convert.addTypeMapping("timestamp", FunctionModifier.TIMESTAMP); //$NON-NLS-1$
		convert.addTypeMapping("char(1)", FunctionModifier.CHAR); //$NON-NLS-1$
		convert.addTypeMapping("varchar(4000)", FunctionModifier.STRING); //$NON-NLS-1$
		registerFunctionModifier(SourceSystemFunctions.CONVERT, convert);		
	}
	
    @Override
    public String translateLiteralDate(Date dateValue) {
        return "DATE '" + formatDateValue(dateValue) + "'"; //$NON-NLS-1$//$NON-NLS-2$
    }

    @Override
    public String translateLiteralTime(Time timeValue) {
        return "TIME '" + formatDateValue(timeValue) + "'"; //$NON-NLS-1$//$NON-NLS-2$
    }
    
    @Override
    public String translateLiteralTimestamp(Timestamp timestampValue) {
        return "TIMESTAMP '" + formatDateValue(timestampValue) + "'"; //$NON-NLS-1$//$NON-NLS-2$ 
    }
	
    @Override
	public List<String> getSupportedFunctions() {
        List<String> supportedFunctions = new ArrayList<String>();
        supportedFunctions.addAll(super.getSupportedFunctions());

        supportedFunctions.add(SourceSystemFunctions.ABS); 
        supportedFunctions.add(SourceSystemFunctions.ACOS); 
        supportedFunctions.add(SourceSystemFunctions.ASIN);
        supportedFunctions.add(SourceSystemFunctions.ATAN);
        supportedFunctions.add(SourceSystemFunctions.ATAN2);
        supportedFunctions.add(SourceSystemFunctions.BITAND);
        //supportedFunctions.add(SourceSystemFunctions.BITNOT);
        supportedFunctions.add(SourceSystemFunctions.BITOR);
        //supportedFunctions.add(SourceSystemFunctions.BITXOR);
        supportedFunctions.add(SourceSystemFunctions.CEILING);
        supportedFunctions.add(SourceSystemFunctions.COS);
        supportedFunctions.add(SourceSystemFunctions.COT);
        supportedFunctions.add(SourceSystemFunctions.DEGREES);
        supportedFunctions.add(SourceSystemFunctions.EXP);
        supportedFunctions.add(SourceSystemFunctions.FLOOR);
        supportedFunctions.add(SourceSystemFunctions.LOG);
        supportedFunctions.add(SourceSystemFunctions.LOG10);
        supportedFunctions.add(SourceSystemFunctions.MOD);
        supportedFunctions.add(SourceSystemFunctions.PI);
        supportedFunctions.add(SourceSystemFunctions.POWER);
        supportedFunctions.add(SourceSystemFunctions.RADIANS);
        supportedFunctions.add(SourceSystemFunctions.ROUND);
        supportedFunctions.add(SourceSystemFunctions.SIGN);
        supportedFunctions.add(SourceSystemFunctions.SIN);
        supportedFunctions.add(SourceSystemFunctions.SQRT);
        supportedFunctions.add(SourceSystemFunctions.TAN);

        supportedFunctions.add(SourceSystemFunctions.ASCII);
        supportedFunctions.add(SourceSystemFunctions.CHAR);
        supportedFunctions.add(SourceSystemFunctions.CONCAT);
        supportedFunctions.add(SourceSystemFunctions.INSERT);
        supportedFunctions.add(SourceSystemFunctions.LCASE);
        supportedFunctions.add(SourceSystemFunctions.LEFT);
        supportedFunctions.add(SourceSystemFunctions.LENGTH);
        supportedFunctions.add(SourceSystemFunctions.LOCATE);
        supportedFunctions.add(SourceSystemFunctions.LPAD);
        supportedFunctions.add(SourceSystemFunctions.LTRIM);
        supportedFunctions.add(SourceSystemFunctions.REPEAT);
        supportedFunctions.add(SourceSystemFunctions.REPLACE);
        supportedFunctions.add(SourceSystemFunctions.RIGHT);
        supportedFunctions.add(SourceSystemFunctions.RPAD);
        supportedFunctions.add(SourceSystemFunctions.RTRIM);
        supportedFunctions.add(SourceSystemFunctions.SUBSTRING);
        supportedFunctions.add(SourceSystemFunctions.TRIM);
        supportedFunctions.add(SourceSystemFunctions.UCASE);
        
        supportedFunctions.add(SourceSystemFunctions.DAYNAME);
        supportedFunctions.add(SourceSystemFunctions.DAYOFMONTH);
        supportedFunctions.add(SourceSystemFunctions.DAYOFWEEK);
        supportedFunctions.add(SourceSystemFunctions.DAYOFYEAR);
        
        //supportedFunctions.add(SourceSystemFunctions.FORMATDATE); 
        //supportedFunctions.add(SourceSystemFunctions.FORMATTIME); 
        //supportedFunctions.add(SourceSystemFunctions.FORMATTIMESTAMP); 
        supportedFunctions.add(SourceSystemFunctions.HOUR);
        supportedFunctions.add(SourceSystemFunctions.MINUTE);
        supportedFunctions.add(SourceSystemFunctions.MONTH);
        supportedFunctions.add(SourceSystemFunctions.MONTHNAME);
        
        //supportedFunctions.add(SourceSystemFunctions.PARSEDATE); 
        //supportedFunctions.add(SourceSystemFunctions.PARSETIME); 
        //supportedFunctions.add(SourceSystemFunctions.PARSETIMESTAMP);
        supportedFunctions.add(SourceSystemFunctions.QUARTER);
        supportedFunctions.add(SourceSystemFunctions.SECOND);
        supportedFunctions.add(SourceSystemFunctions.TIMESTAMPADD);
        supportedFunctions.add(SourceSystemFunctions.TIMESTAMPDIFF);
        supportedFunctions.add(SourceSystemFunctions.WEEK);
        supportedFunctions.add(SourceSystemFunctions.YEAR);

        supportedFunctions.add(SourceSystemFunctions.CONVERT);
        supportedFunctions.add(SourceSystemFunctions.IFNULL);
        supportedFunctions.add(SourceSystemFunctions.COALESCE);
        return supportedFunctions;
    }
	
	@Override
    public boolean supportsInlineViews() {
        return true;
    }
    
    @Override
    public boolean supportsRowLimit() {
        return true;
    }
    
    @Override
    public boolean supportsRowOffset() {
    	return true;
    }
    
    @Override
    public boolean supportsExcept() {
        return true;
    }
    
    @Override
    public boolean supportsIntersect() {
        return true;
    }
    
    @Override
    public boolean supportsAggregatesEnhancedNumeric() {
    	return true;
    }
    
    @Override
    public boolean supportsSelectWithoutFrom() {
    	return true;
    }
    
    @Override
    public String getHibernateDialectClassName() {
    	return "org.hibernate.dialect.HSQLDialect"; //$NON-NLS-1$
    }
    
    @Override
    public boolean supportsDependentJoins() {
    	return getVersion().compareTo(TWO_0) >= 0;
    }
    
    @Override
	public List<?> translateCommand(Command command, ExecutionContext context) {
		if (command instanceof Select) {
			Select select = (Select)command;
			if (select.getFrom() == null || select.getFrom().isEmpty()) {
				List<Object> result = new ArrayList<Object>();
				result.add("VALUES("); //$NON-NLS-1$
				for (int i = 0; i < select.getDerivedColumns().size(); i++) {
					DerivedColumn dc = select.getDerivedColumns().get(i);
					if (i != 0) {
						result.add(", "); //$NON-NLS-1$
					}
					result.add(dc.getExpression());
					
				}
				result.add(")"); //$NON-NLS-1$
				return result;
			}
		}
		return super.translateCommand(command, context);
	}
    
    @Override
    public boolean useParensForJoins() {
    	return true;
    }
    
    @Override
    public boolean isSourceRequiredForCapabilities() {
        return true;
    }
}
