/*******************************************************************************
 *
 * 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:
 *
 *    Kohsuke Kawaguchi, Jean-Baptiste Quenot, Seiji Sogabe, Tom Huybrechts
 *
 *
 *******************************************************************************/ 

package hudson.model;

import hudson.Util;
import hudson.EnvVars;
import hudson.diagnosis.OldDataMonitor;
import hudson.model.Queue.QueueAction;
import hudson.model.labels.LabelAssignmentAction;
import hudson.model.queue.SubTask;
import hudson.tasks.BuildStep;
import hudson.tasks.BuildWrapper;
import hudson.util.VariableResolver;
import org.kohsuke.stapler.export.Exported;
import org.kohsuke.stapler.export.ExportedBean;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

/**
 * Records the parameter values used for a build.
 *
 * <P> This object is associated with the build record so that we remember what
 * parameters were used for what build. It is also attached to the queue item to
 * remember parameter that were specified when scheduling.
 */
@ExportedBean
public class ParametersAction implements Action, Iterable<ParameterValue>, QueueAction, EnvironmentContributingAction, LabelAssignmentAction {

    private final List<ParameterValue> parameters;
    /**
     * @deprecated since 1.283; kept to avoid warnings loading old build data,
     * but now transient.
     */
    private transient AbstractBuild<?, ?> build;

    public ParametersAction(List<ParameterValue> parameters) {
        this.parameters = parameters;
    }

    public ParametersAction(ParameterValue... parameters) {
        this(Arrays.asList(parameters));
    }

    public void createBuildWrappers(AbstractBuild<?, ?> build, Collection<? super BuildWrapper> result) {
        for (ParameterValue p : parameters) {
            BuildWrapper w = p.createBuildWrapper(build);
            if (w != null) {
                result.add(w);
            }
        }
    }

    public void buildEnvVars(AbstractBuild<?, ?> build, EnvVars env) {
        for (ParameterValue p : parameters) {
            p.buildEnvVars(build, env);
        }
    }

    /**
     * Performs a variable subsitution to the given text and return it.
     */
    public String substitute(AbstractBuild<?, ?> build, String text) {
        return Util.replaceMacro(text, createVariableResolver(build));
    }

    /**
     * Creates an {@link VariableResolver} that aggregates all the parameters.
     *
     * <p> If you are a {@link BuildStep}, most likely you should call
     * {@link AbstractBuild#getBuildVariableResolver()}.
     */
    public VariableResolver<String> createVariableResolver(AbstractBuild<?, ?> build) {
        VariableResolver[] resolvers = new VariableResolver[parameters.size() + 1];
        int i = 0;
        for (ParameterValue p : parameters) {
            resolvers[i++] = p.createVariableResolver(build);
        }

        resolvers[i] = build.getBuildVariableResolver();

        return new VariableResolver.Union<String>(resolvers);
    }

    public Iterator<ParameterValue> iterator() {
        return parameters.iterator();
    }

    @Exported(visibility = 2)
    public List<ParameterValue> getParameters() {
        return Collections.unmodifiableList(parameters);
    }

    public ParameterValue getParameter(String name) {
        for (ParameterValue p : parameters) {
            if (p.getName().equals(name)) {
                return p;
            }
        }
        return null;
    }
    
    @Override
    public Label getAssignedLabel(SubTask task) {
        for (ParameterValue p : parameters) {
            Label l = p.getAssignedLabel(task);
            if (l != null) {
                return l;
            }
        }
        return null;
    }

    public String getDisplayName() {
        return Messages.ParameterAction_DisplayName();
    }

    public String getIconFileName() {
        return "document-properties.png";
    }

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

    /**
     * Allow an other build of the same project to be scheduled, if it has other
     * parameters.
     */
    public boolean shouldSchedule(List<Action> actions) {
        List<ParametersAction> others = Util.filter(actions, ParametersAction.class);
        if (others.isEmpty()) {
            return !parameters.isEmpty();
        } else {
            // I don't think we need multiple ParametersActions, but let's be defensive
            Set<ParameterValue> params = new HashSet<ParameterValue>();
            for (ParametersAction other : others) {
                params.addAll(other.parameters);
            }
            return !params.equals(new HashSet<ParameterValue>(this.parameters));
        }
    }

    private Object readResolve() {
        if (build != null) {
            OldDataMonitor.report(build, "1.283");
        }
        return this;
    }
}