package org.apache.maven.plugin;

/*
 * 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.
 */

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

import org.apache.maven.model.Plugin;
import org.apache.maven.plugin.descriptor.MojoDescriptor;
import org.codehaus.plexus.util.xml.Xpp3Dom;

public class MojoExecution
{

    private Plugin plugin;
    
    private String goal;
    
    private String executionId;
    
    private MojoDescriptor mojoDescriptor;

    private Xpp3Dom configuration;

    /**
     * Describes the source of an execution.
     */
    public enum Source
    {

        /**
         * An execution that originates from the direct invocation of a goal from the CLI.
         */
        CLI,

        /**
         * An execution that originates from a goal bound to a lifecycle phase.
         */
        LIFECYCLE,
    }

    private Source source;

    /**
     * The phase may or may not have been bound to a phase but once the plan has been calculated we know what phase
     * this mojo execution is going to run in.
     */
    private String lifecyclePhase;

    /**
     * The executions to fork before this execution, indexed by the groupId:artifactId:version of the project on which
     * the forked execution are to be run and in reactor build order.
     */
    private Map<String, List<MojoExecution>> forkedExecutions = new LinkedHashMap<String, List<MojoExecution>>();

    public MojoExecution( Plugin plugin, String goal, String executionId )
    {
        this.plugin = plugin;
        this.goal = goal;
        this.executionId = executionId;
    }
    
    public MojoExecution( MojoDescriptor mojoDescriptor )
    {
        this.mojoDescriptor = mojoDescriptor;
        this.executionId = null;
        this.configuration = null;
    }

    public MojoExecution( MojoDescriptor mojoDescriptor, String executionId, Source source )
    {
        this.mojoDescriptor = mojoDescriptor;
        this.executionId = executionId;
        this.configuration = null;
        this.source = source;
    }

    public MojoExecution( MojoDescriptor mojoDescriptor, String executionId )
    {
        this.mojoDescriptor = mojoDescriptor;
        this.executionId = executionId;
        this.configuration = null;
    }

    public MojoExecution( MojoDescriptor mojoDescriptor, Xpp3Dom configuration )
    {
        this.mojoDescriptor = mojoDescriptor;
        this.configuration = configuration;
        this.executionId = null;
    }

    /**
     * Gets the source of this execution.
     * 
     * @return The source of this execution or {@code null} if unknown.
     */
    public Source getSource()
    {
        return source;
    }

    public String getExecutionId()
    {
        return executionId;
    }

    public Plugin getPlugin()
    {
        if ( mojoDescriptor != null )
        {
            return mojoDescriptor.getPluginDescriptor().getPlugin();
        }

        return plugin;
    }

    public MojoDescriptor getMojoDescriptor()
    {
        return mojoDescriptor;
    }

    public Xpp3Dom getConfiguration()
    {
        return configuration;
    }

    public void setConfiguration( Xpp3Dom configuration )
    {
        this.configuration = configuration;
    }
    
    public String identify()
    {
        StringBuilder sb = new StringBuilder( 256 );
        
        sb.append( executionId );
        sb.append( configuration.toString() );
        
        return sb.toString();
    }

    public String getLifecyclePhase()
    {
        return lifecyclePhase;
    }

    public void setLifecyclePhase( String lifecyclePhase )
    {
        this.lifecyclePhase = lifecyclePhase;
    }        

    @Override
    public String toString()
    {
        StringBuilder buffer = new StringBuilder( 128 );
        if ( mojoDescriptor != null )
        {
            buffer.append( mojoDescriptor.getId() );
        }
        buffer.append( " {execution: " ).append( executionId ).append( "}" );
        return buffer.toString();
    }

    public String getGroupId()
    {
        if ( mojoDescriptor != null )
        {
            return mojoDescriptor.getPluginDescriptor().getGroupId();
        }
        
        return plugin.getGroupId();
    }

    public String getArtifactId()
    {
        if ( mojoDescriptor != null )
        {
            return mojoDescriptor.getPluginDescriptor().getArtifactId();
        }
        
        return plugin.getArtifactId();
    }

    public String getVersion()
    {
        if ( mojoDescriptor != null )
        {
            return mojoDescriptor.getPluginDescriptor().getVersion();
        }        
        
        return plugin.getVersion();
    }

    public String getGoal()
    {
        if ( mojoDescriptor != null )
        {
            return mojoDescriptor.getGoal();
        }
        
        return goal;
    }

    public void setMojoDescriptor( MojoDescriptor mojoDescriptor )
    {
        this.mojoDescriptor = mojoDescriptor;
    }

    public Map<String, List<MojoExecution>> getForkedExecutions()
    {
        return forkedExecutions;
    }

    public void setForkedExecutions( String projectKey, List<MojoExecution> forkedExecutions )
    {
        this.forkedExecutions.put( projectKey, forkedExecutions );
    }

}