/*******************************************************************************
 * Copyright (c) 2011, 2012 Red Hat, Inc.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     Red Hat Incorporated - initial API and implementation
 *******************************************************************************/

package org.eclipse.cdt.autotools.ui.editors;

import org.eclipse.cdt.autotools.ui.editors.parser.AutoconfElement;
import org.eclipse.cdt.autotools.ui.editors.parser.AutoconfMacroElement;
import org.eclipse.cdt.autotools.ui.editors.parser.InvalidMacroException;
import org.eclipse.cdt.internal.autotools.core.AutotoolsPropertyConstants;
import org.eclipse.cdt.internal.autotools.core.VersionComparator;

public class AcInitElement extends AutoconfMacroElement {

	private static final String BAD_VERSION_NUMBER = "AC_INIT_badVersionNumber"; //$NON-NLS-1$

	public AcInitElement(String name) {
		super(name);
	}

	@Override
	public void validate(String version) throws InvalidMacroException {
		super.validate(version);

		if (this.getChildren().length == 0)
			return;

		if (VersionComparator.compare(version, AutotoolsPropertyConstants.AC_VERSION_2_59) >= 0) {
			if (this.getChildren().length < 2)
				return;

			// autoconf 2.67 onwards allows a more relaxed VERSION string format,
			// so only validate arguments for earlier versions
			if (VersionComparator.compare(version, AutotoolsPropertyConstants.AC_VERSION_2_67) < 0)
				this.validateMultipleArguments();
		}

		return;
	}

	private void validateMultipleArguments() throws InvalidMacroException {

		// There are no restrictions on the first argument.

		// Validate second argument (version number).
		AutoconfElement argument = this.getChildren()[1];
		// match a digit followed by a dot zero or more times
		// but always end with a digit
		if (!argument.getName().matches("(\\d*\\.)*((\\d+))")) { //$NON-NLS-1$
			throw new InvalidMacroException(AutoconfEditorMessages.getString(BAD_VERSION_NUMBER), argument);
		}
	}
}