/*******************************************************************************
 * Copyright (c) 2009 Wind River Systems and others.
 * 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:
 *     Wind River Systems - initial API and implementation
 *******************************************************************************/
package org.eclipse.debug.examples.core.pda.protocol;


/**
 * Base class for run-control events.
 */
public class PDARunControlEvent extends PDAEvent {
    
    public final int fThreadId;
    public final String fReason;
    
    public PDARunControlEvent(String message) {
        super(message);
        fThreadId = getThreadId(message);
        fReason = getStateChangeReason(message);
    }
    
    protected int getThreadId(String message) {
        int nameEnd = getName(message).length();
        if ( Character.isDigit(message.charAt(nameEnd + 1)) ) {
            int threadIdEnd = message.indexOf(' ', nameEnd + 1);
            threadIdEnd = threadIdEnd == -1 ? message.length() : threadIdEnd;
            try {
                return Integer.parseInt(message.substring(nameEnd + 1, threadIdEnd));
            } catch (NumberFormatException e) {
                throw new IllegalArgumentException("Invalid event: " + message);                
            }
        } else {
            return -1;
        }
    }

    protected String getStateChangeReason(String message) {
        int idx = getName(message).length();
        if ( Character.isDigit(message.charAt(idx + 1)) ) {
            idx = message.indexOf(' ', idx + 1);
            idx = idx == -1 ? message.length() : idx + 1;
        } else {
            idx++;
        }
        if (idx >=  message.length()) {
            return "";
        }

        int endIdx = message.indexOf(' ', idx);
        endIdx = endIdx == -1 ? message.length() : endIdx;
        return message.substring(idx, endIdx);
    }
    
    protected String getName(String message) {
        int nameEnd = message.indexOf(' ');
        nameEnd = nameEnd == -1 ? message.length() : nameEnd;
        return message.substring(0, nameEnd);
    }

    public static boolean isEventMessage(String message) {
        return message.startsWith("started");
    }
}