package org.apache.maven.model.profile;

/*
 * 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.File;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

/**
 * Describes the environmental context used to determine the activation status of profiles.
 *
 * @author Benjamin Bentmann
 */
public class DefaultProfileActivationContext
    implements ProfileActivationContext
{

    private List<String> activeProfileIds = Collections.emptyList();

    private List<String> inactiveProfileIds = Collections.emptyList();

    private Map<String, String> systemProperties = Collections.emptyMap();

    private Map<String, String> userProperties = Collections.emptyMap();

    private Map<String, String> projectProperties = Collections.emptyMap();

    private File projectDirectory;

    @Override
    public List<String> getActiveProfileIds()
    {
        return activeProfileIds;
    }

    /**
     * Sets the identifiers of those profiles that should be activated by explicit demand.
     *
     * @param activeProfileIds The identifiers of those profiles to activate, may be {@code null}.
     * @return This context, never {@code null}.
     */
    public DefaultProfileActivationContext setActiveProfileIds( List<String> activeProfileIds )
    {
        if ( activeProfileIds != null )
        {
            this.activeProfileIds = Collections.unmodifiableList( activeProfileIds );
        }
        else
        {
            this.activeProfileIds = Collections.emptyList();
        }

        return this;
    }

    @Override
    public List<String> getInactiveProfileIds()
    {
        return inactiveProfileIds;
    }

    /**
     * Sets the identifiers of those profiles that should be deactivated by explicit demand.
     *
     * @param inactiveProfileIds The identifiers of those profiles to deactivate, may be {@code null}.
     * @return This context, never {@code null}.
     */
    public DefaultProfileActivationContext setInactiveProfileIds( List<String> inactiveProfileIds )
    {
        if ( inactiveProfileIds != null )
        {
            this.inactiveProfileIds = Collections.unmodifiableList( inactiveProfileIds );
        }
        else
        {
            this.inactiveProfileIds = Collections.emptyList();
        }

        return this;
    }

    @Override
    public Map<String, String> getSystemProperties()
    {
        return systemProperties;
    }

    /**
     * Sets the system properties to use for interpolation and profile activation. The system properties are collected
     * from the runtime environment like {@link System#getProperties()} and environment variables.
     *
     * @param systemProperties The system properties, may be {@code null}.
     * @return This context, never {@code null}.
     */
    @SuppressWarnings( "unchecked" )
    public DefaultProfileActivationContext setSystemProperties( Properties systemProperties )
    {
        if ( systemProperties != null )
        {
            this.systemProperties = Collections.unmodifiableMap( (Map) systemProperties );
        }
        else
        {
            this.systemProperties = Collections.emptyMap();
        }

        return this;
    }

    /**
     * Sets the system properties to use for interpolation and profile activation. The system properties are collected
     * from the runtime environment like {@link System#getProperties()} and environment variables.
     *
     * @param systemProperties The system properties, may be {@code null}.
     * @return This context, never {@code null}.
     */
    public DefaultProfileActivationContext setSystemProperties( Map<String, String> systemProperties )
    {
        if ( systemProperties != null )
        {
            this.systemProperties = Collections.unmodifiableMap( systemProperties );
        }
        else
        {
            this.systemProperties = Collections.emptyMap();
        }

        return this;
    }

    @Override
    public Map<String, String> getUserProperties()
    {
        return userProperties;
    }

    /**
     * Sets the user properties to use for interpolation and profile activation. The user properties have been
     * configured directly by the user on his discretion, e.g. via the {@code -Dkey=value} parameter on the command
     * line.
     *
     * @param userProperties The user properties, may be {@code null}.
     * @return This context, never {@code null}.
     */
    @SuppressWarnings( "unchecked" )
    public DefaultProfileActivationContext setUserProperties( Properties userProperties )
    {
        if ( userProperties != null )
        {
            this.userProperties = Collections.unmodifiableMap( (Map) userProperties );
        }
        else
        {
            this.userProperties = Collections.emptyMap();
        }

        return this;
    }

    /**
     * Sets the user properties to use for interpolation and profile activation. The user properties have been
     * configured directly by the user on his discretion, e.g. via the {@code -Dkey=value} parameter on the command
     * line.
     *
     * @param userProperties The user properties, may be {@code null}.
     * @return This context, never {@code null}.
     */
    public DefaultProfileActivationContext setUserProperties( Map<String, String> userProperties )
    {
        if ( userProperties != null )
        {
            this.userProperties = Collections.unmodifiableMap( userProperties );
        }
        else
        {
            this.userProperties = Collections.emptyMap();
        }

        return this;
    }

    @Override
    public File getProjectDirectory()
    {
        return projectDirectory;
    }

    /**
     * Sets the base directory of the current project.
     *
     * @param projectDirectory The base directory of the current project, may be {@code null} if profile activation
     *                         happens in the context of metadata retrieval rather than project building.
     * @return This context, never {@code null}.
     */
    public DefaultProfileActivationContext setProjectDirectory( File projectDirectory )
    {
        this.projectDirectory = projectDirectory;

        return this;
    }

    @Override
    public Map<String, String> getProjectProperties()
    {
        return projectProperties;
    }

    public DefaultProfileActivationContext setProjectProperties( Properties projectProperties )
    {
        if ( projectProperties != null )
        {

            this.projectProperties = Collections.unmodifiableMap( toMap( projectProperties ) );
        }
        else
        {
            this.projectProperties = Collections.emptyMap();
        }

        return this;
    }

    private Map<String, String> toMap( Properties properties )
    {
        if ( properties == null )
        {
            return Collections.emptyMap();
        }
        Map<String, String> map = new HashMap<String, String>();
        Enumeration keys = properties.keys();
        while ( keys.hasMoreElements() )
        {
            String key = (String) keys.nextElement();
            map.put( key, properties.getProperty( key ) );
        }
        return map;
    }
}