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/*******************************************************************************
 *
 * Copyright (c) 2004-2009 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, Martin Eigenbrodt
 *
 *
 *******************************************************************************/ 

package hudson.model;

import hudson.tasks.BuildStep;
import hudson.tasks.BuildWrapper;
import hudson.tasks.Builder;
import hudson.tasks.Recorder;
import hudson.tasks.Notifier;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collection;
import java.util.List;
import java.util.logging.Logger;

import static hudson.model.Result.FAILURE;
import static hudson.model.Result.ABORTED;

/**
 * A build of a {@link Project}.
 *
 * Steps of a build
  Roughly speaking, a {@link Build} goes through
 * the following stages:
 *
 * 
 SCM checkout 
Hudson decides which directory to use for a build,
 * then the source code is checked out
 *
 * 
Pre-build steps 
Everyone gets their
 * {@link BuildStep#prebuild(AbstractBuild, BuildListener)} invoked to indicate
 * that the build is starting
 *
 * 
Build wrapper set up
 * 
{@link BuildWrapper#setUp(AbstractBuild, Launcher, BuildListener)} is
 * invoked. This is normally to prepare an environment for the build.
 *
 * 
Builder runs
 * 
{@link Builder#perform(AbstractBuild, Launcher, BuildListener)} is
 * invoked. This is where things that are useful to users happen, like calling
 * Ant, Make, etc.
 *
 * 
Recorder runs
 * 
{@link Recorder#perform(AbstractBuild, Launcher, BuildListener)} is
 * invoked. This is normally to record the output from the build, such as test
 * results.
 *
 * 
Notifier runs
 * 
{@link Notifier#perform(AbstractBuild, Launcher, BuildListener)} is
 * invoked. This is normally to send out notifications, based on the results
 * determined so far. 
 *
 *  And beyond that, the build is considered complete, and from then on
 * {@link Build} object is there to keep the record of what happened in this
 * build.
 *
 * @author Kohsuke Kawaguchi
 */
public abstract class Build, B extends Build>
        extends AbstractBuild {

    /**
     * Creates a new build.
     */
    protected Build(P project) throws IOException {
        super(project);
    }

    protected Build(P job, Calendar timestamp) {
        super(job, timestamp);
    }

    /**
     * Loads a build from a log file.
     */
    protected Build(P project, File buildDir) throws IOException {
        super(project, buildDir);
    }

//
//
// actions
//
//
    @Override
    public void run() {
        run(createRunner());
    }

    protected Runner createRunner() {
        return new RunnerImpl();
    }

    protected class RunnerImpl extends AbstractRunner {

        protected Result doRun(BuildListener listener) throws Exception {
            if (!preBuild(listener, project.getBuilders())) {
                return FAILURE;
            }
            if (!preBuild(listener, project.getPublishers())) {
                return FAILURE;
            }

            Result r = null;
            try {
                List wrappers = new ArrayList(project.getBuildWrappers().values());

                ParametersAction parameters = getAction(ParametersAction.class);
                if (parameters != null) {
                    parameters.createBuildWrappers(Build.this, wrappers);
                }

                for (BuildWrapper w : wrappers) {
                    Environment e = w.setUp((AbstractBuild) Build.this, launcher, listener);
                    if (e == null) {
                        return (r = FAILURE);
                    }
                    buildEnvironments.add(e);
                }

                if (!build(listener, project.getBuilders())) {
                    r = FAILURE;
                }
            } catch (InterruptedException e) {
                r = ABORTED;
                throw e;
            } finally {
                if (r != null) {
                    setResult(r);
                }
                // tear down in reverse order
                boolean failed = false;
                for (int i = buildEnvironments.size() - 1; i >= 0; i--) {
                    if (!buildEnvironments.get(i).tearDown(Build.this, listener)) {
                        failed = true;
                    }
                }
                // WARNING The return in the finally clause will trump any return before
                if (failed) {
                    return FAILURE;
                }
            }

            return r;
        }

        public void post2(BuildListener listener) throws IOException, InterruptedException {
            if (!performAllBuildSteps(listener, project.getPublishers(), true)) {
                setResult(FAILURE);
            }
            if (!performAllBuildSteps(listener, project.getProperties(), true)) {
                setResult(FAILURE);
            }
        }

        @Override
        public void cleanUp(BuildListener listener) throws Exception {
            // at this point it's too late to mark the build as a failure, so ignore return value.
            performAllBuildSteps(listener, project.getPublishers(), false);
            performAllBuildSteps(listener, project.getProperties(), false);
            super.cleanUp(listener);
        }

        private boolean build(BuildListener listener, Collection steps) throws IOException, InterruptedException {
            for (BuildStep bs : steps) {
                if (!perform(bs, listener)) {
                    return false;
                }
            }
            return true;
        }
    }
    private static final Logger LOGGER = Logger.getLogger(Build.class.getName());
}