/*

 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.io.File;

import java.io.IOException;

import java.util.function.Function;

import java.util.stream.Stream;

import static java.lang.String.format;

import static java.lang.System.lineSeparator;

import static java.util.Arrays.asList;

import static java.util.Collections.emptyList;

import static java.util.stream.Collectors.joining;

import static java.util.stream.Collectors.toList;

public class TestBase {

    public static final String LINE_SEPARATOR = lineSeparator();

    private <S> InMemoryFileManager compile(

            List<String> options,

            Function<S, ? extends JavaFileObject> src2JavaFileObject,

            List<S> sources)

            throws IOException, CompilationException {

        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();

        List<? extends JavaFileObject> src = sources.stream()

                .map(src2JavaFileObject)

                .collect(toList());

        DiagnosticCollector<? super JavaFileObject> dc = new DiagnosticCollector<>();

        try (InMemoryFileManager fileManager

                     = new InMemoryFileManager(compiler.getStandardFileManager(null, null, null))) {

            JavaCompiler.CompilationTask task = compiler.getTask(null, fileManager, dc, options, null, src);

            boolean success = task.call();

            if (!success) {

                String errorMessage = dc.getDiagnostics().stream()

                        .map(Object::toString)

                        .collect(joining("\n"));

                throw new CompilationException("Compilation Error\n\n" + errorMessage);

            }

            return fileManager;

        }

    }

    public InMemoryFileManager compile(String... sources)

            throws IOException, CompilationException {

        return compile(emptyList(), sources);

    }

    /**

     * @return map where key is className, value is corresponding ClassFile.

     */

            throws IOException, CompilationException {

        return compile(options, ToolBox.JavaSource::new, asList(sources));

    }

    public InMemoryFileManager compile(String[]... sources) throws IOException,

            CompilationException {

        return compile(emptyList(), sources);

    }

    /**

     * @return map where key is className, value is corresponding ClassFile.

     */

            throws IOException, CompilationException {

        return compile(options, src -> new ToolBox.JavaSource(src[0], src[1]), asList(sources));

    }

    public void assertEquals(Object actual, Object expected, String message) {

        if (!Objects.equals(actual, expected))

            throw new AssertionFailedException(format("%s%nGot: %s, Expected: %s", message, actual, expected));

    }

    public void assertNull(Object actual, String message) {

        assertEquals(actual, null, message);

    }

    public void assertNotNull(Object actual, String message) {

        if (Objects.isNull(actual)) {

            throw new AssertionFailedException(message + " : Expected not null value");

        }

    }

    public void assertTrue(boolean actual, String message) {

        assertEquals(actual, true, message);

    }

    public void assertFalse(boolean actual, String message) {

        assertEquals(actual, false, message);

    }

    public File getSourceDir() {

        return new File(System.getProperty("test.src", "."));

    }

    public File getClassDir() {

        return new File(System.getProperty("test.classes", TestBase.class.getResource(".").getPath()));

    }

    public File getSourceFile(String fileName) {

        return new File(getSourceDir(), fileName);

    }

    public File getClassFile(String fileName) {

        return new File(getClassDir(), fileName);

    }

    public File getClassFile(Class clazz) {

        return getClassFile(clazz.getName().replace(".", "/") + ".class");

    }

    public void echo(String message) {

        System.err.println(message.replace("\n", LINE_SEPARATOR));

    }

        System.err.printf(template, Stream.of(args)

                .map(Objects::toString)

                .map(m -> m.replace("\n", LINE_SEPARATOR))

                .collect(toList())

                .toArray());

    }

    public static class CompilationException extends Exception {

        public CompilationException(String message) {

            super(message);

        }

    }

    public static class AssertionFailedException extends RuntimeException {

        public AssertionFailedException(String message) {

            super(message);

        }

    }

}