/*
 * 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.
 */
package org.apache.logging.log4j.core.test;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import javax.tools.Diagnostic;
import javax.tools.DiagnosticCollector;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;

import static org.assertj.core.api.Assertions.assertThat;

public class Compiler {
    public static void compile(final File source, final String... compilerOptions) throws IOException {
        compile(Collections.singletonList(source), compilerOptions);
    }

    public static void compile(final Iterable<? extends File> sources, final String... compilerOptions) throws IOException {
        final JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
        final DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<>();
        final List<String> errors = new ArrayList<>();
        try (final StandardJavaFileManager fileManager = compiler.getStandardFileManager(diagnostics, null, null)) {
            final Iterable<? extends JavaFileObject> compilationUnits = fileManager.getJavaFileObjectsFromFiles(sources);
            final List<String> options = Arrays.asList(compilerOptions);
            compiler.getTask(null, fileManager, diagnostics, options, null, compilationUnits).call();

            // check we don't have any compilation errors
            for (final Diagnostic<? extends JavaFileObject> diagnostic : diagnostics.getDiagnostics()) {
                if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {
                    errors.add(diagnostic.toString());
                }
            }
        }
        assertThat(errors).isEmpty();
    }
}
