/*
 *  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
 *
 *    https://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.
 */
package org.grails.cli.compiler;

import org.codehaus.groovy.ast.ClassHelper;
import org.codehaus.groovy.control.SourceUnit;
import org.codehaus.groovy.control.customizers.ImportCustomizer;

/**
 * Smart extension of {@link ImportCustomizer} that will only add a specific import if a
 * class with the same name is not already explicitly imported.
 *
 * @author Dave Syer
 */
class SmartImportCustomizer extends ImportCustomizer {

    private SourceUnit source;

    SmartImportCustomizer(SourceUnit source) {
        this.source = source;
    }

    @Override
    public ImportCustomizer addImport(String alias, String className) {
        if (this.source.getAST().getImport(ClassHelper.make(className).getNameWithoutPackage()) == null) {
            super.addImport(alias, className);
        }
        return this;
    }

    @Override
    public ImportCustomizer addImports(String... imports) {
        for (String alias : imports) {
            if (this.source.getAST().getImport(ClassHelper.make(alias).getNameWithoutPackage()) == null) {
                super.addImports(alias);
            }
        }
        return this;
    }

}
