/*******************************************************************************
 * Copyright (c) 2008, 2012 IBM Corporation and others.
 *
 * 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:
 *     IBM Corporation - initial API and implementation
 * Martin Oberhuber (Wind River) - [276255] fix insertion of extra space chars
 * Martin Oberhuber (Wind River) - [234872] avoid rem's that echo to the console
 *******************************************************************************/
package org.eclipse.releng.tools;

import java.io.PrintWriter;
import java.util.Calendar;


public abstract class CopyrightComment {

	public static final int UNKNOWN_COMMENT = -1;
	public static final int JAVA_COMMENT = 1;
	public static final int PROPERTIES_COMMENT = 2;
	public static final int C_COMMENT = 3;
	public static final int SHELL_MAKE_COMMENT = 4;
	public static final int BAT_COMMENT = 5;
	public static final int JAVASCRIPT_COMMENT = 6;
	public static final int XML_COMMENT = 7;

	private int commentStyle;
	private int creationYear = -1;
	private int revisionYear = -1;
	private String lineDelimiter;

	protected CopyrightComment(int commentStyle, int creationYear, int revisionYear) {
		this.commentStyle = commentStyle;
		this.creationYear = creationYear == -1 ? (Calendar.getInstance().get(Calendar.YEAR)) : creationYear;
		this.revisionYear = revisionYear;
	}

	public static String getLinePrefix(int commentStyle) {
		switch(commentStyle) {
			case JAVA_COMMENT:
			case C_COMMENT:
			case JAVASCRIPT_COMMENT:
				return " *";  //$NON-NLS-1$
			case PROPERTIES_COMMENT:
				return "#"; //$NON-NLS-1$
			case SHELL_MAKE_COMMENT:
				return "#"; //$NON-NLS-1$
			case BAT_COMMENT:
				return "@rem"; //$NON-NLS-1$
			case XML_COMMENT:
				return "   "; //$NON-NLS-1$
			default:
				return null;
		}
	}

	protected void writeCommentStart(PrintWriter writer) {
		switch(commentStyle) {
		case JAVA_COMMENT:
		case C_COMMENT:
		case JAVASCRIPT_COMMENT:
			println(writer, "/*******************************************************************************"); //$NON-NLS-1$
			break;
		case PROPERTIES_COMMENT:
			println(writer, "###############################################################################"); //$NON-NLS-1$
			break;
		case SHELL_MAKE_COMMENT:
			println(writer, "#*******************************************************************************"); //$NON-NLS-1$
			break;
		case BAT_COMMENT:
			println(writer, "@rem ***************************************************************************"); //$NON-NLS-1$
			break;
		case XML_COMMENT:
			println(writer, "<!--"); //$NON-NLS-1$
			break;
		}
	}

	protected void writeCommentEnd(PrintWriter writer) {
		switch(commentStyle) {
		case JAVA_COMMENT:
		case C_COMMENT:
		case JAVASCRIPT_COMMENT:
			println(writer, " *******************************************************************************/"); //$NON-NLS-1$
			break;
		case PROPERTIES_COMMENT:
			println(writer, "###############################################################################"); //$NON-NLS-1$
			break;
		case SHELL_MAKE_COMMENT:
			println(writer, "#*******************************************************************************"); //$NON-NLS-1$
			break;
		case BAT_COMMENT:
			println(writer, "@rem ***************************************************************************"); //$NON-NLS-1$
			break;
		case XML_COMMENT:
			println(writer, " -->"); //$NON-NLS-1$
			break;
		}
	}


	public int getRevisionYear() {
		return revisionYear == -1 ? creationYear : revisionYear;
	}

	public boolean hasRevisionYear() {
		return revisionYear != -1;
	}

	public void setRevisionYear(int year) {
		if (revisionYear != -1 || creationYear != year)
			revisionYear = year;
	}

	/**
	 * @param lineDelimiter
	 * @since 3.7
	 */
	public void setLineDelimiter(String lineDelimiter) {
		this.lineDelimiter= lineDelimiter;
	}

	public int getCreationYear() {
		return creationYear;
	}

	public String getCommentPrefix() {
		return getLinePrefix(commentStyle);
	}

	public abstract String getCopyrightComment();

	/**
	 * @since 3.7
	 */
	protected void println(PrintWriter writer, String line) {
		writer.print(line);
		writer.print(lineDelimiter);
	}
}