/*

 * Copyright 2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

import javax.tools.ToolProvider;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.InputStreamReader;

import java.io.PrintStream;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

import javax.tools.JavaCompiler;

/**

 * This class provides some common utilites for the launcher tests.

 */

public enum TestHelper {

    INSTANCE;

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

    static final boolean isSDK = JAVAHOME.endsWith("jre");

    static final String javaCmd;

    static final String javacCmd;

    static final JavaCompiler compiler;

    static final boolean debug = Boolean.getBoolean("Arrrghs.Debug");

    static final boolean isWindows =

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

    static int testExitValue = 0;

    static {

        compiler = ToolProvider.getSystemJavaCompiler();

        File binDir = (isSDK) ? new File((new File(JAVAHOME)).getParentFile(), "bin")

            : new File(JAVAHOME, "bin");

        File javaCmdFile = (isWindows)

                ? new File(binDir, "java.exe")

                : new File(binDir, "java");

        javaCmd = javaCmdFile.getAbsolutePath();

        if (!javaCmdFile.canExecute()) {

            throw new RuntimeException("java <" + TestHelper.javaCmd + "> must exist");

        }

        File javacCmdFile = (isWindows)

                ? new File(binDir, "javac.exe")

                : new File(binDir, "javac");

        javacCmd = javacCmdFile.getAbsolutePath();

        if (!javacCmdFile.canExecute()) {

            throw new RuntimeException("java <" + javacCmd + "> must exist");

        }

    }

    /*

     * A generic jar file creator which creates the java file, compiles it

     * and jar's it up for use.

     */

    static void createJar(File jarName, File mainClass, String... mainDefs)

            throws FileNotFoundException {

            createJar(null, jarName, mainClass, mainDefs);

    }

    /*

     * A method which takes manifest entry to specify a specific manifest

     * Main-Class name.

     */

    static void createJar(String mEntry, File jarName, File mainClass, String... mainDefs)

            throws FileNotFoundException {

        if (jarName.exists()) {

            jarName.delete();

        }

        PrintStream ps = new PrintStream(new FileOutputStream(mainClass + ".java"));

        ps.println("public class Foo {");

        if (mainDefs != null) {

            for (String x : mainDefs) {

                ps.println(x);

            }

        }

        ps.println("}");

        ps.close();

        String compileArgs[] = {

            mainClass + ".java"

        };

        if (compiler.run(null, null, null, compileArgs) != 0) {

            throw new RuntimeException("compilation failed " + mainClass + ".java");

        }

        if (mEntry == null && mainDefs == null) {

            mEntry = "MIA";

        } else {

            mEntry = mainClass.getName();

        }

        String jarArgs[] = {

            (debug) ? "cvfe" : "cfe",

            jarName.getAbsolutePath(),

            mEntry,

            mainClass.getName() + ".class"

        };

        sun.tools.jar.Main jarTool =

                new sun.tools.jar.Main(System.out, System.err, "JarCreator");

        if (!jarTool.run(jarArgs)) {

            throw new RuntimeException("jar creation failed " + jarName);

        }

    }

    /*

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

     */

    static TestResult doExec(String...cmds) {

        String cmdStr = "";

        for (String x : cmds) {

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

        }

        ProcessBuilder pb = new ProcessBuilder(cmds);

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

        BufferedReader rdr = null;

        try {

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

            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 TestHelper.TestResult(cmdStr, p.exitValue(), outputList);

        } catch (Exception ex) {

            ex.printStackTrace();

            throw new RuntimeException(ex.getMessage());

        }

    }

    /*

     * A class to encapsulate the test results and stuff, with some ease

     * of use methods to check the test results.

     */

    static class TestResult {

        StringBuilder status;

        int exitValue;

        List<String> testOutput;

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

            status = new StringBuilder(str);

            exitValue = rv;

            testOutput = oList;

        }

        void checkNegative() {

            if (exitValue == 0) {

                status = status.append("  Error: test must not return 0 exit value");

                testExitValue++;

            }

        }

        void checkPositive() {

            if (exitValue != 0) {

                status = status.append("  Error: test did not return 0 exit value");

                testExitValue++;

            }

        }

        boolean isOK() {

            return exitValue == 0;

        }

        boolean isZeroOutput() {

            if (!testOutput.isEmpty()) {

                status = status.append("  Error: No message from cmd please");

                testExitValue++;

                return false;

            }

            return true;

        }

        boolean isNotZeroOutput() {

            if (testOutput.isEmpty()) {

                status = status.append("  Error: Missing message");

                testExitValue++;

                return false;

            }

            return true;

        }

        public String toString() {

            if (debug) {

                for (String x : testOutput) {

                    status = status.append(x + "\n");

                }

            }

            return status.toString();

        }

        boolean contains(String str) {

            for (String x : testOutput) {

                if (x.contains(str)) {

                    return true;

                }

            }

            status = status.append("   Error: string <" + str + "> not found ");

            testExitValue++;

            return false;

        }

    }

}