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/*
 * Copyright (c) 2006 Pyxis Technologies inc.
 *
 * This is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This software 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA,
 * or see the FSF site: http://www.fsf.org.
 */

package com.greenpepper.interpreter;

import com.greenpepper.interpreter.column.*;
import com.greenpepper.reflect.Fixture;
import com.greenpepper.util.StringUtil;

/**
 * HeaderForm class.
 *
 * @author oaouattara
 * @version $Id: $Id
 */
public final class HeaderForm
{
    private final String text;

    /**
     * parse.
     *
     * @param text a {@link java.lang.String} object.
     * @return a {@link com.greenpepper.interpreter.HeaderForm} object.
     */
    public static HeaderForm parse(String text)
    {
        return new HeaderForm( text );
    }

    private HeaderForm(String text)
    {
        this.text = text;
    }

    /**
     * isGiven.
     *
     * @return a boolean.
     */
    public boolean isGiven()
    {
        return !isExpected() && !isSaved();
    }

    /**
     * isExpected.
     *
     * @return a boolean.
     */
    public boolean isExpected()
    {
        return header().endsWith( "()" ) || header().endsWith( "?" );
    }

    private String header()
    {
        return text.trim();
    }

    /**
     * isSaved.
     *
     * @return a boolean.
     */
    public boolean isSaved()
    {
        return header().endsWith( "=" );
    }

    /**
     * isRecalled.
     *
     * @return a boolean.
     */
    public boolean isRecalled()
    {
        return header().startsWith( "=" );
    }

    /**
     * message.
     *
     * @return a {@link java.lang.String} object.
     */
    public String message()
    {
        return header().replaceAll( "=", "" ).replaceAll( "\\?", "" ).replaceAll( "\\(\\)", "" );
    }

    /**
     * selectColumn.
     *
     * @param fixture a {@link com.greenpepper.reflect.Fixture} object.
     * @return a {@link com.greenpepper.interpreter.column.Column} object.
     * @throws java.lang.Exception if any.
     */
    public Column selectColumn(Fixture fixture) throws Exception
    {
        if (isNull()) return new NullColumn();

        if (isSaved()) return new SavedColumn( fixture.check( message() ) );
        if (isExpected()) return new ExpectedColumn( fixture.check( message() ) );
        if (isRecalled()) return new RecalledColumn( fixture.send( message() ));

        return new GivenColumn( fixture.send( message() ) );
    }

    /**
     * isNull.
     *
     * @return a boolean.
     */
    public boolean isNull()
    {
        return StringUtil.isBlank( text );
    }
}