package org.apache.maven.model.profile.activation;

/*
 * 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 javax.inject.Named;
import javax.inject.Singleton;

import org.apache.maven.model.Activation;
import org.apache.maven.model.ActivationProperty;
import org.apache.maven.model.Profile;
import org.apache.maven.model.building.ModelProblemCollector;
import org.apache.maven.model.building.ModelProblem.Severity;
import org.apache.maven.model.building.ModelProblem.Version;
import org.apache.maven.model.building.ModelProblemCollectorRequest;
import org.apache.maven.model.profile.ProfileActivationContext;
import org.codehaus.plexus.util.StringUtils;

/**
 * Determines profile activation based on the existence or value of some execution property.
 *
 * @author Benjamin Bentmann
 * @see ActivationProperty
 */
@Named( "property" )
@Singleton
public class PropertyProfileActivator
    implements ProfileActivator
{

    @Override
    public boolean isActive( Profile profile, ProfileActivationContext context, ModelProblemCollector problems )
    {
        Activation activation = profile.getActivation();

        if ( activation == null )
        {
            return false;
        }

        ActivationProperty property = activation.getProperty();

        if ( property == null )
        {
            return false;
        }

        String name = property.getName();
        boolean reverseName = false;

        if ( name != null && name.startsWith( "!" ) )
        {
            reverseName = true;
            name = name.substring( 1 );
        }

        if ( name == null || name.length() <= 0 )
        {
            problems.add( new ModelProblemCollectorRequest( Severity.ERROR, Version.BASE )
                    .setMessage( "The property name is required to activate the profile " + profile.getId() )
                    .setLocation( property.getLocation( "" ) ) );
            return false;
        }

        String sysValue = context.getUserProperties().get( name );
        if ( sysValue == null )
        {
            sysValue = context.getSystemProperties().get( name );
        }

        String propValue = property.getValue();
        if ( StringUtils.isNotEmpty( propValue ) )
        {
            boolean reverseValue = false;
            if ( propValue.startsWith( "!" ) )
            {
                reverseValue = true;
                propValue = propValue.substring( 1 );
            }

            // we have a value, so it has to match the system value...
            boolean result = propValue.equals( sysValue );

            return reverseValue ? !result : result;
        }
        else
        {
            boolean result = StringUtils.isNotEmpty( sysValue );

            return reverseName ? !result : result;
        }
    }

    @Override
    public boolean presentInConfig( Profile profile, ProfileActivationContext context, ModelProblemCollector problems )
    {
        Activation activation = profile.getActivation();

        if ( activation == null )
        {
            return false;
        }

        ActivationProperty property = activation.getProperty();

        if ( property == null )
        {
            return false;
        }
        return true;
    }

}
