/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the License. You may obtain a
 * copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */

package org.apache.maven.lifecycle.internal.stub;

import org.apache.maven.execution.AbstractExecutionListener;
import org.apache.maven.execution.DefaultMavenExecutionRequest;
import org.apache.maven.execution.DefaultMavenExecutionResult;
import org.apache.maven.execution.MavenExecutionRequest;
import org.apache.maven.execution.MavenSession;
import org.apache.maven.execution.ProjectDependencyGraph;
import org.apache.maven.lifecycle.LifecycleNotFoundException;
import org.apache.maven.lifecycle.LifecyclePhaseNotFoundException;
import org.apache.maven.lifecycle.internal.GoalTask;
import org.apache.maven.lifecycle.internal.ProjectBuildList;
import org.apache.maven.lifecycle.internal.ProjectSegment;
import org.apache.maven.lifecycle.internal.TaskSegment;
import org.apache.maven.plugin.InvalidPluginDescriptorException;
import org.apache.maven.plugin.MojoNotFoundException;
import org.apache.maven.plugin.PluginDescriptorParsingException;
import org.apache.maven.plugin.PluginNotFoundException;
import org.apache.maven.plugin.PluginResolutionException;
import org.apache.maven.plugin.prefix.NoPluginFoundForPrefixException;
import org.apache.maven.plugin.version.PluginVersionResolutionException;
import org.apache.maven.project.MavenProject;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * A stub dependency graph that is custom made for testing concurrent build graph evaluations.
 * <p/>
 * Implements a graph as follows:
 * A has no dependencies
 * B depends on A
 * C depends on A
 * X depends on B & C
 * Y depends on B
 * Z depends on C
 *
 * @author Kristian Rosenvold
 */
public class ProjectDependencyGraphStub
    implements ProjectDependencyGraph
{
    public static final MavenProject A = new MavenProject();

    public static final MavenProject B = new MavenProject();

    public static final MavenProject C = new MavenProject();

    public static final MavenProject X = new MavenProject();

    public static final MavenProject Y = new MavenProject();

    public static final MavenProject Z = new MavenProject();

    public static final MavenProject UNKNOWN = new MavenProject();

    static
    {
        A.setArtifactId( "A" );
        B.setArtifactId( "B" );
        C.setArtifactId( "C" );
        X.setArtifactId( "X" );
        Y.setArtifactId( "Y" );
        Z.setArtifactId( "Z" );
    }

    // This should probably be moved to a separate stub

    public static ProjectBuildList getProjectBuildList( MavenSession session )
        throws InvalidPluginDescriptorException, PluginVersionResolutionException, PluginDescriptorParsingException,
        NoPluginFoundForPrefixException, MojoNotFoundException, PluginNotFoundException, PluginResolutionException,
        LifecyclePhaseNotFoundException, LifecycleNotFoundException
    {
        final List<ProjectSegment> list = getProjectBuilds( session );
        return new ProjectBuildList( list );

    }

    public static List<ProjectSegment> getProjectBuilds( MavenSession session )
        throws InvalidPluginDescriptorException, PluginVersionResolutionException, PluginDescriptorParsingException,
        NoPluginFoundForPrefixException, PluginNotFoundException, MojoNotFoundException, PluginResolutionException,
        LifecyclePhaseNotFoundException, LifecycleNotFoundException
    {
        List<ProjectSegment> projectBuilds = new ArrayList<ProjectSegment>();

        TaskSegment segment = createTaskSegment();
        projectBuilds.add( createProjectBuild( A, session, segment ) );
        projectBuilds.add( createProjectBuild( B, session, segment ) );
        projectBuilds.add( createProjectBuild( C, session, segment ) );
        projectBuilds.add( createProjectBuild( X, session, segment ) );
        projectBuilds.add( createProjectBuild( Y, session, segment ) );
        projectBuilds.add( createProjectBuild( Z, session, segment ) );
        return projectBuilds;
    }

    private static ProjectSegment createProjectBuild( MavenProject project, MavenSession session,
                                                      TaskSegment taskSegment )
        throws InvalidPluginDescriptorException, PluginVersionResolutionException, PluginDescriptorParsingException,
        NoPluginFoundForPrefixException, MojoNotFoundException, PluginNotFoundException, PluginResolutionException,
        LifecyclePhaseNotFoundException, LifecycleNotFoundException
    {
        final MavenSession session1 = session.clone();
        return new ProjectSegment( project, taskSegment, session1 );
    }


    private static TaskSegment createTaskSegment()
    {
        TaskSegment result = new TaskSegment( false );
        result.getTasks().add( new GoalTask( "t1" ) );
        result.getTasks().add( new GoalTask( "t2" ) );
        return result;
    }

    class Dependency
    {
        MavenProject dependant;

        MavenProject dependency;

        Dependency( MavenProject dependant, MavenProject dependency )
        {
            this.dependant = dependant;
            this.dependency = dependency;
        }

        void addIfDownstream( MavenProject mavenProject, List<MavenProject> result )
        {
            if ( dependency == mavenProject )
            {
                result.add( dependant );
            }
        }

        void addIfUpstreamOf( MavenProject mavenProject, List<MavenProject> result )
        {
            if ( dependant == mavenProject )
            {
                result.add( dependency ); // All projects are the statics from this class
            }
        }
    }

    private List<Dependency> getDependencies()
    {
        List<Dependency> dependencies = new ArrayList<Dependency>();
        dependencies.add( new Dependency( B, A ) );
        dependencies.add( new Dependency( C, A ) );
        dependencies.add( new Dependency( X, B ) );
        dependencies.add( new Dependency( X, C ) );
        dependencies.add( new Dependency( Y, B ) );
        dependencies.add( new Dependency( Z, C ) );
        return dependencies;
    }

    public List<MavenProject> getSortedProjects()
    {
        return Arrays.asList( A, B, C, X, Y, Z ); // I'm not entirely sure about the order but this shold do...
    }

    public List<MavenProject> getDownstreamProjects( MavenProject project, boolean transitive )
    {
        if ( transitive )
        {
            throw new RuntimeException( "Not implemented yet" );
        }
        List<MavenProject> result = new ArrayList<MavenProject>();
        for ( Dependency dependency : getDependencies() )
        {
            dependency.addIfDownstream( project, result );
        }
        return result;
    }

    public List<MavenProject> getUpstreamProjects( MavenProject project, boolean transitive )
    {
        /*  if ( transitive )
        {
            throw new RuntimeException( "Not implemented yet" );
        }*/
        List<MavenProject> result = new ArrayList<MavenProject>();
        final List<Dependency> dependencies = getDependencies();
        for ( Dependency dependency : dependencies )
        {
            dependency.addIfUpstreamOf( project, result );
        }
        return result;
    }

    public static MavenSession getMavenSession( MavenProject mavenProject )
    {
        final MavenSession session = getMavenSession();
        session.setCurrentProject( mavenProject );
        return session;
    }

    public static MavenSession getMavenSession()
    {
        final DefaultMavenExecutionResult defaultMavenExecutionResult = new DefaultMavenExecutionResult();
        MavenExecutionRequest mavenExecutionRequest = new DefaultMavenExecutionRequest();
        mavenExecutionRequest.setExecutionListener( new AbstractExecutionListener() );
        mavenExecutionRequest.setGoals( Arrays.asList( "clean", "aggr", "install" ) );
        mavenExecutionRequest.setDegreeOfConcurrency( 1 );
        final MavenSession session = new MavenSession( null, null, mavenExecutionRequest, defaultMavenExecutionResult );
        final ProjectDependencyGraphStub dependencyGraphStub = new ProjectDependencyGraphStub();
        session.setProjectDependencyGraph( dependencyGraphStub );
        session.setProjects( dependencyGraphStub.getSortedProjects() );
        return session;
    }

}
