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/*******************************************************************************
 *
 * Copyright (c) 2004-2010 Oracle Corporation.
 *
 * 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: 
 *
 *    Michael B. Donohue
 *     
 *
 *******************************************************************************/ 

package hudson.model;

import hudson.diagnosis.OldDataMonitor;
import hudson.model.Queue.Task;
import hudson.model.queue.FoldableAction;
import hudson.util.XStream2;
import org.kohsuke.stapler.export.Exported;
import org.kohsuke.stapler.export.ExportedBean;
import com.thoughtworks.xstream.converters.UnmarshallingContext;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

@ExportedBean
public class CauseAction implements FoldableAction, RunAction {
    /**
     * @deprecated since 2009-02-28
     */
    @Deprecated
    // there can be multiple causes, so this is deprecated
    private transient Cause cause;
	
    private List causes = new ArrayList();

	@Exported(visibility=2)
	public List getCauses() {
		return causes;
	}
		
	public CauseAction(Cause c) {
		this.causes.add(c);
	}
	
	public CauseAction(CauseAction ca) {
		this.causes.addAll(ca.causes);
	}
	
	public String getDisplayName() {
		return "Cause";
	}

	public String getIconFileName() {
		// no icon
		return null;
	}

	public String getUrlName() {
		return "cause";
	}

    /**
     * Get list of causes with duplicates combined into counters.
     * @return Map of Cause to number of occurrences of that Cause
     */
    public Map getCauseCounts() {
        Map result = new LinkedHashMap();
        for (Cause c : causes) {
            Integer i = result.get(c);
            result.put(c, i == null ? 1 : i.intValue() + 1);
        }
        return result;
    }

    /**
     * @deprecated as of 1.288
     *      but left here for backward compatibility.
     */
    public String getShortDescription() {
        if(causes.isEmpty())    return "N/A";
        return causes.get(0).getShortDescription();
    }

    public void onLoad() {
        // noop
    }

    public void onBuildComplete() {
        // noop
    }

    /**
     * When hooked up to build, notify {@link Cause}s.
     */
    public void onAttached(Run owner) {
        if (owner instanceof AbstractBuild) {// this should be always true but being defensive here
            AbstractBuild b = (AbstractBuild) owner;
            for (Cause c : causes) {
                c.onAddedTo(b);
            }
        }
    }

    public void foldIntoExisting(hudson.model.Queue.Item item, Task owner, List otherActions) {
        CauseAction existing = item.getAction(CauseAction.class);
        if (existing!=null) {
            existing.causes.addAll(this.causes);
            return;
        }
        // no CauseAction found, so add a copy of this one
        item.getActions().add(new CauseAction(this));
    }

    public static class ConverterImpl extends XStream2.PassthruConverter {
        public ConverterImpl(XStream2 xstream) { super(xstream); }
        @Override protected void callback(CauseAction ca, UnmarshallingContext context) {
            // if we are being read in from an older version
            if (ca.cause != null) {
                if (ca.causes == null) ca.causes = new ArrayList();
                ca.causes.add(ca.cause);
                OldDataMonitor.report(context, "1.288");
            }
        }
    }
}