/*

 * Copyright (c) 2012, 2013, 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.BufferedReader;

import java.io.File;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.io.StringWriter;

import java.nio.charset.Charset;

import java.nio.file.Files;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

/*

 * support infrastructure to invoke a java class from the command line

 */

class LUtils {

    static final com.sun.tools.javac.Main javac =

            new com.sun.tools.javac.Main();

    static final File cwd = new File(".").getAbsoluteFile();

    static final String JAVAHOME = System.getProperty("java.home");

    static final boolean isWindows =

            System.getProperty("os.name", "unknown").startsWith("Windows");

    static final File JAVA_BIN_FILE = new File(JAVAHOME, "bin");

    static final File JAVA_CMD = new File(JAVA_BIN_FILE,

            isWindows ? "java.exe" : "java");

    static final File JAR_CMD = new File(JAR_BIN_FILE,

            isWindows ? "jar.exe" : "jar");

    protected LUtils() {

    }

    public static void compile(String... args) {

        if (javac.compile(args) != 0) {

            throw new RuntimeException("compilation fails");

        }

    }

    static void createFile(File outFile, List<String> content) {

        try {

            Files.write(outFile.getAbsoluteFile().toPath(), content,

                    Charset.defaultCharset());

        } catch (IOException ex) {

            throw new RuntimeException(ex);

        }

    }

    static File getClassFile(File javaFile) {

        return javaFile.getName().endsWith(".java")

                ? new File(javaFile.getName().replace(".java", ".class"))

                : null;

    }

    static String getSimpleName(File inFile) {

        String fname = inFile.getName();

        return fname.substring(0, fname.indexOf("."));

    }

    static TestResult doExec(String... cmds) {

        return doExec(null, null, cmds);

    }

    /*

     * A method which executes a java cmd and returns the results in a container

     */

    static TestResult doExec(Map<String, String> envToSet,

            java.util.Set<String> envToRemove, String... cmds) {

        String cmdStr = "";

        for (String x : cmds) {

            cmdStr = cmdStr.concat(x + " ");

        }

        ProcessBuilder pb = new ProcessBuilder(cmds);

        Map<String, String> env = pb.environment();

        if (envToRemove != null) {

            for (String key : envToRemove) {

                env.remove(key);

            }

        }

        if (envToSet != null) {

            env.putAll(envToSet);

        }

        BufferedReader rdr = null;

        try {

            List<String> outputList = new ArrayList<>();

            pb.redirectErrorStream(true);

            Process p = pb.start();

            rdr = new BufferedReader(new InputStreamReader(p.getInputStream()));

            String in = rdr.readLine();

            while (in != null) {

                outputList.add(in);

                in = rdr.readLine();

            }

            p.waitFor();

            p.destroy();

            return new TestResult(cmdStr, p.exitValue(), outputList,

                    env, new Throwable("current stack of the test"));

        } catch (Exception ex) {

            ex.printStackTrace();

            throw new RuntimeException(ex.getMessage());

        }

    }

    static class TestResult {

        String cmd;

        int exitValue;

        List<String> testOutput;

        Map<String, String> env;

        Throwable t;

        public TestResult(String str, int rv, List<String> oList,

                Map<String, String> env, Throwable t) {

            cmd = str;

            exitValue = rv;

            testOutput = oList;

            this.env = env;

            this.t = t;

        }

        void assertZero(String message) {

            if (exitValue != 0) {

                System.err.println(this);

                throw new RuntimeException(message);

            }

        }

        @Override

        public String toString() {

            StringWriter sw = new StringWriter();

            PrintWriter status = new PrintWriter(sw);

            status.println("Cmd: " + cmd);

            status.println("Return code: " + exitValue);

            status.println("Environment variable:");

            for (String x : env.keySet()) {

                status.println("\t" + x + "=" + env.get(x));

            }

            status.println("Output:");

            for (String x : testOutput) {

                status.println("\t" + x);

            }

            status.println("Exception:");

            status.println(t.getMessage());

            t.printStackTrace(status);

            return sw.getBuffer().toString();

        }

    }

}