package org.apache.maven.wrapper;

/*
 * 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.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Locale;
import java.util.Properties;

/**
 * Wrapper executor, running {@link Installer} to get a Maven distribution ready, followed by
 * {@link BootstrapMainStarter} to launch the Maven bootstrap.
 *
 * @author Hans Dockter
 */
public class WrapperExecutor
{
    public static final String DISTRIBUTION_URL_PROPERTY = "distributionUrl";

    public static final String DISTRIBUTION_BASE_PROPERTY = "distributionBase";

    public static final String ZIP_STORE_BASE_PROPERTY = "zipStoreBase";

    public static final String DISTRIBUTION_PATH_PROPERTY = "distributionPath";

    public static final String ZIP_STORE_PATH_PROPERTY = "zipStorePath";

    private final Properties properties;

    private final Path propertiesFile;

    private final WrapperConfiguration config = new WrapperConfiguration();

    public static WrapperExecutor forProjectDirectory( Path projectDir )
    {
        return new WrapperExecutor( projectDir.resolve( "maven/wrapper/maven-wrapper.properties" ), new Properties() );
    }

    public static WrapperExecutor forWrapperPropertiesFile( Path propertiesFile )
    {
        if ( Files.notExists( propertiesFile ) )
        {
            throw new RuntimeException( String.format( Locale.ROOT, "Wrapper properties file '%s' does not exist.",
                                                       propertiesFile ) );
        }
        return new WrapperExecutor( propertiesFile, new Properties() );
    }

    WrapperExecutor( Path propertiesFile, Properties properties )
    {
        this.properties = properties;
        this.propertiesFile = propertiesFile;
        if ( Files.exists( propertiesFile ) )
        {
            try
            {
                loadProperties( propertiesFile, properties );
                config.setDistribution( prepareDistributionUri() );
                config.setDistributionBase( getProperty( DISTRIBUTION_BASE_PROPERTY, config.getDistributionBase() ) );
                config.setDistributionPath( Paths.get( getProperty( DISTRIBUTION_PATH_PROPERTY,
                                                                    config.getDistributionPath().toString() ) ) );
                config.setZipBase( getProperty( ZIP_STORE_BASE_PROPERTY, config.getZipBase() ) );
                config.setZipPath( Paths.get( getProperty( ZIP_STORE_PATH_PROPERTY,
                                                           config.getZipPath().toString() ) ) );
            }
            catch ( Exception e )
            {
                throw new RuntimeException( String.format( Locale.ROOT, "Could not load wrapper properties from '%s'.",
                                                           propertiesFile ),
                                            e );
            }
        }
    }

    private URI prepareDistributionUri()
        throws URISyntaxException
    {
        URI source = readDistroUrl();
        if ( source.getScheme() == null )
        {
            // no scheme means someone passed a relative url. In our context only file relative urls make sense.
            return propertiesFile.getParent().resolve( source.getSchemeSpecificPart() ).toUri();
        }
        else
        {
            return source;
        }
    }

    private URI readDistroUrl()
        throws URISyntaxException
    {
        return new URI( getProperty( DISTRIBUTION_URL_PROPERTY ) );
    }

    private static void loadProperties( Path propertiesFile, Properties properties )
        throws IOException
    {
        try ( InputStream inStream = Files.newInputStream( propertiesFile ) )
        {
            properties.load( inStream );
        }
    }

    /**
     * Returns the Maven distribution which this wrapper will use. Returns null if no wrapper meta-data was found in the
     * specified project directory.
     *
     * @return the Maven distribution which this wrapper will use
     */
    public URI getDistribution()
    {
        return config.getDistribution();
    }

    /**
     * Returns the configuration for this wrapper.
     *
     * @return the configuration for this wrapper
     */
    public WrapperConfiguration getConfiguration()
    {
        return config;
    }

    public void execute( String[] args, Installer install, BootstrapMainStarter bootstrapMainStarter )
        throws Exception
    {
        Path mavenHome = install.createDist( config );
        bootstrapMainStarter.start( args, mavenHome );
    }

    private String getProperty( String propertyName )
    {
        return getProperty( propertyName, null );
    }

    private String getProperty( String propertyName, String defaultValue )
    {
        String value = properties.getProperty( propertyName, defaultValue );
        if ( value == null )
        {
            reportMissingProperty( propertyName );
        }
        return value;
    }

    private void reportMissingProperty( String propertyName )
    {
        throw new RuntimeException( String.format( Locale.ROOT,
                                                   "No value with key '%s' specified in wrapper properties file '%s'.",
                                                   propertyName, propertiesFile ) );
    }
}