/*******************************************************************************
 * Copyright (c) 2005-2008 Polarion Software.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Alexey Mikoyan - Initial implementation
 *******************************************************************************/

package org.eclipse.team.svn.ui.verifier;

import java.util.regex.Pattern;

import org.eclipse.swt.widgets.Control;
import org.eclipse.team.svn.core.BaseMessages;
import org.eclipse.team.svn.ui.SVNUIMessages;

/**
 * Verify multiple properties separated by line separator
 *
 * @author Alexey Mikoyan
 *
 */
public class MultiLinePropertyVerifier extends AbstractFormattedVerifier {
    protected static String ERROR_MESSAGE_INVALID_FORMAT = "Field '" + AbstractFormattedVerifier.FIELD_NAME + "' contains malformed property in line ";

	public MultiLinePropertyVerifier(String fieldName) {
		super(fieldName);
		MultiLinePropertyVerifier.ERROR_MESSAGE_INVALID_FORMAT = SVNUIMessages.Verifier_MultiLineProperty_Main;
	}

	protected String getErrorMessageImpl(Control input) {
		String[] properties = this.getText(input).split(System.getProperty("line.separator")); //$NON-NLS-1$
		for (int i = 0; i < properties.length; i++) {
			if (properties[i].length() == 0) {
				continue;
			}
			
			String retVal = this.validateProperty(properties[i], i);
			if (retVal != null) {
				return retVal;
			}
		}
		
		return null;
	}

	protected String getWarningMessageImpl(Control input) {
		return null;
	}
	
	protected String validateProperty(String property, int line) {
		Pattern pattern;
		
		String[] propNameValue = property.split("=", 2); //$NON-NLS-1$
		
		if (propNameValue.length == 0 || propNameValue[0].length() == 0) {
			return this.formatMainMessage(line) + " " + SVNUIMessages.Verifier_MultiLineProperty_NameIsEmpty; //$NON-NLS-1$
		}
		
        pattern = Pattern.compile("[a-zA-Z:_].*"); //$NON-NLS-1$
        if (!pattern.matcher(propNameValue[0]).matches()) {
        	return this.formatMainMessage(line) + " " + SVNUIMessages.Verifier_MultiLineProperty_NotALetter; //$NON-NLS-1$
        }
        
        pattern = Pattern.compile("[a-zA-Z0-9:\\-_\\.]+"); //$NON-NLS-1$
        if (!pattern.matcher(propNameValue[0]).matches()) {
        	return this.formatMainMessage(line) + " " + SVNUIMessages.Verifier_MultiLineProperty_InvalidNameChar; //$NON-NLS-1$
        }
		
    	if (propNameValue.length < 2 || propNameValue[1].length() == 0) {
        	return this.formatMainMessage(line) + " " + SVNUIMessages.Verifier_MultiLineProperty_EmptyValue; //$NON-NLS-1$
    	}

		return null;
	}

	protected String formatMainMessage(int line) {
		return BaseMessages.format(MultiLinePropertyVerifier.ERROR_MESSAGE_INVALID_FORMAT, new Object[] {AbstractFormattedVerifier.FIELD_NAME, String.valueOf(line + 1)});
	}
	
}