package org.apache.maven.plugin.trac;

/*
 * 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.net.MalformedURLException;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.ResourceBundle;

import org.apache.maven.plugin.changes.AbstractChangesReport;
import org.apache.maven.plugin.changes.ProjectUtils;
import org.apache.maven.plugin.issues.Issue;
import org.apache.maven.plugin.issues.IssuesReportGenerator;
import org.apache.maven.plugin.issues.IssuesReportHelper;
import org.apache.maven.plugins.annotations.Mojo;
import org.apache.maven.plugins.annotations.Parameter;
import org.apache.maven.reporting.MavenReportException;
import org.apache.xmlrpc.XmlRpcException;

/**
 * Goal which downloads issues from the Issue Tracking System and generates a report.
 *
 * @author Noriko Kinugasa
 * @version $Id$
 * @since 2.1
 */
@Mojo( name = "trac-report", threadSafe = true )
public class TracMojo
    extends AbstractChangesReport
{
    /**
     * Deprecated Trac columns.
     */
    @SuppressWarnings( "checkstyle:staticvariablename" )
    private static Map<String, Integer> DEPRECATED_TRAC_COLUMNS = new HashMap<String, Integer>();

    /**
     * Valid Trac columns.
     */
    @SuppressWarnings( "checkstyle:staticvariablename" )
    private static Map<String, Integer> TRAC_COLUMNS = new HashMap<String, Integer>();

    static
    {
        DEPRECATED_TRAC_COLUMNS.put( "changed", IssuesReportHelper.COLUMN_UPDATED );
        DEPRECATED_TRAC_COLUMNS.put( "component", IssuesReportHelper.COLUMN_COMPONENT );
        DEPRECATED_TRAC_COLUMNS.put( "created", IssuesReportHelper.COLUMN_CREATED );
        DEPRECATED_TRAC_COLUMNS.put( "id", IssuesReportHelper.COLUMN_ID );
        DEPRECATED_TRAC_COLUMNS.put( "milestone", IssuesReportHelper.COLUMN_FIX_VERSION );
        DEPRECATED_TRAC_COLUMNS.put( "owner", IssuesReportHelper.COLUMN_ASSIGNEE );
        DEPRECATED_TRAC_COLUMNS.put( "priority", IssuesReportHelper.COLUMN_PRIORITY );
        DEPRECATED_TRAC_COLUMNS.put( "reporter", IssuesReportHelper.COLUMN_REPORTER );
        DEPRECATED_TRAC_COLUMNS.put( "resolution", IssuesReportHelper.COLUMN_RESOLUTION );
        DEPRECATED_TRAC_COLUMNS.put( "status", IssuesReportHelper.COLUMN_STATUS );
        DEPRECATED_TRAC_COLUMNS.put( "summary", IssuesReportHelper.COLUMN_SUMMARY );
        DEPRECATED_TRAC_COLUMNS.put( "type", IssuesReportHelper.COLUMN_TYPE );

        TRAC_COLUMNS.put( "Assignee", IssuesReportHelper.COLUMN_ASSIGNEE );
        TRAC_COLUMNS.put( "Component", IssuesReportHelper.COLUMN_COMPONENT );
        TRAC_COLUMNS.put( "Created", IssuesReportHelper.COLUMN_CREATED );
        TRAC_COLUMNS.put( "Fix Version", IssuesReportHelper.COLUMN_FIX_VERSION );
        TRAC_COLUMNS.put( "Id", IssuesReportHelper.COLUMN_ID );
        TRAC_COLUMNS.put( "Priority", IssuesReportHelper.COLUMN_PRIORITY );
        TRAC_COLUMNS.put( "Reporter", IssuesReportHelper.COLUMN_REPORTER );
        TRAC_COLUMNS.put( "Resolution", IssuesReportHelper.COLUMN_RESOLUTION );
        TRAC_COLUMNS.put( "Status", IssuesReportHelper.COLUMN_STATUS );
        TRAC_COLUMNS.put( "Summary", IssuesReportHelper.COLUMN_SUMMARY );
        TRAC_COLUMNS.put( "Type", IssuesReportHelper.COLUMN_TYPE );
        TRAC_COLUMNS.put( "Updated", IssuesReportHelper.COLUMN_UPDATED );
    }

    /**
     * Sets the column names that you want to show in the report. The columns will appear in the report in the same
     * order as you specify them here. Multiple values can be separated by commas.
     * <p>
     * Valid columns are: <code>Assignee</code>, <code>Component</code>, <code>Created</code>, <code>Fix Version</code>,
     * <code>Id</code>, <code>Priority</code>, <code>Reporter</code>, <code>Resolution</code>, <code>Status</code>,
     * <code>Summary</code>, <code>Type</code> and <code>Updated</code>.
     * </p>
     *
     * @since 2.2
     */
    @Parameter( defaultValue = "Id,Type,Summary,Assignee,Reporter,Priority,Status,Resolution,Created,Updated" )
    private String columnNames;

    /**
     * Defines the Trac query for searching ticket.
     */
    @Parameter( defaultValue = "order=id" )
    private String query;

    /**
     * Defines the Trac password for authentication into a private Trac installation.
     */
    @Parameter( defaultValue = "" )
    private String tracPassword;

    /**
     * Defines the Trac username for authentication into a private Trac installation.
     */
    @Parameter( defaultValue = "" )
    private String tracUser;

    /* --------------------------------------------------------------------- */
    /* Public methods */
    /* --------------------------------------------------------------------- */

    /**
     * @see org.apache.maven.reporting.AbstractMavenReport#canGenerateReport()
     */
    public boolean canGenerateReport()
    {
        // Run only at the execution root
        if ( runOnlyAtExecutionRoot && !isThisTheExecutionRoot() )
        {
            getLog().info( "Skipping the Trac Report in this project because it's not the Execution Root" );
            return false;
        }
        String message = ProjectUtils.validateIssueManagement( project, "Trac", "Trac Report" );
        if ( message != null )
        {
            getLog().warn( message );
        }
        return message == null;
    }

    public void executeReport( Locale locale )
        throws MavenReportException
    {
        // Validate parameters
        List<Integer> columnIds =
            IssuesReportHelper.getColumnIds( columnNames, TRAC_COLUMNS, DEPRECATED_TRAC_COLUMNS, getLog() );
        if ( columnIds.size() == 0 )
        {
            // This can happen if the user has configured column names and they are all invalid
            throw new MavenReportException( "maven-changes-plugin: None of the configured columnNames '" + columnNames
                + "' are valid." );
        }

        try
        {
            // Download issues
            TracDownloader issueDownloader = new TracDownloader();
            configureIssueDownloader( issueDownloader );

            List<Issue> issueList = issueDownloader.getIssueList();

            // Generate the report
            IssuesReportGenerator report = new IssuesReportGenerator( IssuesReportHelper.toIntArray( columnIds ) );

            if ( issueList.isEmpty() )
            {
                report.doGenerateEmptyReport( getBundle( locale ), getSink() );
                getLog().warn( "No ticket has matched." );
            }
            else
            {
                report.doGenerateReport( getBundle( locale ), getSink(), issueList );
            }
        }
        catch ( MalformedURLException e )
        {
            // Rethrow this error so that the build fails
            throw new MavenReportException( "The Trac URL is incorrect." );
        }
        catch ( XmlRpcException e )
        {
            // Rethrow this error so that the build fails
            throw new MavenReportException( "XmlRpc Error.", e );
        }
        catch ( Exception e )
        {
            e.printStackTrace();
        }
    }

    public String getDescription( Locale locale )
    {
        return getBundle( locale ).getString( "report.issues.description" );
    }

    public String getName( Locale locale )
    {
        return getBundle( locale ).getString( "report.issues.name" );
    }

    public String getOutputName()
    {
        return "trac-report";
    }

    /* --------------------------------------------------------------------- */
    /* Private methods */
    /* --------------------------------------------------------------------- */

    private ResourceBundle getBundle( Locale locale )
    {
        return ResourceBundle.getBundle( "trac-report", locale, this.getClass().getClassLoader() );
    }

    private void configureIssueDownloader( TracDownloader issueDownloader )
    {
        issueDownloader.setProject( project );

        issueDownloader.setQuery( query );

        issueDownloader.setTracPassword( tracPassword );

        issueDownloader.setTracUser( tracUser );
    }
}