package org.apache.maven.plugins.jira;

/*
 * 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.text.NumberFormat;
import java.text.ParsePosition;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.maven.plugin.logging.Log;

/**
 * A helper class with common JIRA related functionality.
 *
 * @author Dennis Lundberg
 * @version $Id$
 */
public class JiraHelper
{
    private static final String PID = "?pid="; // MCHANGES-281 addd ?

    /**
     * Parse out the base URL for JIRA and the JIRA project id from the issue management URL.
     *
     * @param issueManagementUrl The URL to the issue management system
     * @return A <code>Map</code> containing the URL and project id
     */
    static Map<String, String> getJiraUrlAndProjectId( String issueManagementUrl )
    {
        String url = issueManagementUrl;

        if ( url.endsWith( "/" ) )
        {
            // MCHANGES-218
            url = url.substring( 0, url.lastIndexOf( '/' ) );
        }

        // chop off the parameter part
        int pos = url.indexOf( '?' );

        // and get the id while we're at it
        String id = "";

        if ( pos >= 0 )
        {
            // project id
            id = url.substring( url.lastIndexOf( '=' ) + 1 );
        }

        String jiraUrl = url.substring( 0, url.lastIndexOf( '/' ) );

        if ( jiraUrl.endsWith( "secure" ) )
        {
            jiraUrl = jiraUrl.substring( 0, jiraUrl.lastIndexOf( '/' ) );
        }
        else
        {
            // If the issueManagement.url points to a component, then "browse"
            // will not be at the end - it might be in the middle somewhere.
            // Try to find it.
            final int index = jiraUrl.indexOf( "/browse" );
            if ( index != -1 )
            {
                jiraUrl = jiraUrl.substring( 0, index );
            }
        }

        HashMap<String, String> urlMap = new HashMap<>( 4 );

        urlMap.put( "url", jiraUrl );

        urlMap.put( "id", id );

        return urlMap;
    }

    /**
     * Try to get a JIRA pid from the issue management URL.
     *
     * @param log Used to tell the user what happened
     * @param issueManagementUrl The URL to the issue management system
     * @param client The client used to connect to JIRA
     * @return The JIRA id for the project, or null if it can't be found
     */
    public static String getPidFromJira( Log log, String issueManagementUrl, HttpClient client )
    {
        String jiraId = null;
        GetMethod gm = new GetMethod( issueManagementUrl );

        String projectPage;
        try
        {
            client.executeMethod( gm );
            log.debug( "Successfully reached JIRA." );
            projectPage = gm.getResponseBodyAsString();
        }
        catch ( Exception e )
        {
            if ( log.isDebugEnabled() )
            {
                log.error( "Unable to reach the JIRA project page:", e );
            }
            else
            {
                log.error( "Unable to reach the JIRA project page. Cause is: " + e.getLocalizedMessage() );
            }
            return null;
        }

        int pidIndex = projectPage.indexOf( PID );

        if ( pidIndex == -1 )
        {
            log.error( "Unable to extract a JIRA pid from the page at the url " + issueManagementUrl );
        }
        else
        {
            NumberFormat nf = NumberFormat.getInstance();
            Number pidNumber = nf.parse( projectPage, new ParsePosition( pidIndex + PID.length() ) );
            jiraId = Integer.toString( pidNumber.intValue() );
            log.debug( "Found the pid " + jiraId + " at " + issueManagementUrl );
        }
        return jiraId;
    }

    private JiraHelper()
    {
        // utility class
    }

    /**
     * Parse out the base URL for JIRA and the JIRA project name from the issue management URL. The issue management URL
     * is assumed to be of the format http(s)://host:port/browse/{projectname}
     *
     * @param issueManagementUrl The URL to the issue management system
     * @return A <code>Map</code> containing the URL and project name
     * @since 2.8
     */
    public static Map<String, String> getJiraUrlAndProjectName( String issueManagementUrl )
    {
        final int indexBrowse = issueManagementUrl.indexOf( "/browse/" );

        String jiraUrl;
        String project;

        if ( indexBrowse != -1 )
        {
            jiraUrl = issueManagementUrl.substring( 0, indexBrowse );

            final int indexBrowseEnd = indexBrowse + "/browse/".length();

            final int indexProject = issueManagementUrl.indexOf( "/", indexBrowseEnd );

            if ( indexProject != -1 )
            {
                // Project name has trailing '/'
                project = issueManagementUrl.substring( indexBrowseEnd, indexProject );
            }
            else
            {
                // Project name without trailing '/'
                project = issueManagementUrl.substring( indexBrowseEnd );
            }
        }
        else
        {
            throw new IllegalArgumentException( "Invalid browse URL" );
        }

        HashMap<String, String> urlMap = new HashMap<>( 4 );
        urlMap.put( "url", jiraUrl );
        urlMap.put( "project", project );

        return urlMap;
    }

    /**
     * @param url URL.
     * @return the base URL.
     * @since 2.8
     */
    public static String getBaseUrl( String url )
    {
        int index = url.indexOf( "/", 8 ); // Ignore http:// or https://
        return url.substring( 0, index );
    }
}