/*
 * Copyright (c) 2009, 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.
 */

/*
 * @test
 * @bug 6838467
 * @summary JSR199 FileObjects don't obey general contract of equals.
 */

import java.io.*;
import java.util.*;
import java.util.zip.*;
import javax.tools.*;
import com.sun.tools.javac.file.JavacFileManager;
import com.sun.tools.javac.util.Context;

public class T6838467 {
    boolean fileSystemIsCaseSignificant = !new File("a").equals(new File("A"));

    enum FileKind {
        DIR("dir"),
        ZIP("zip"),
        ZIPFILEINDEX("zip");
        FileKind(String path) {
            file = new File(path);
        }
        final File file;
    };

    enum CompareKind {
        SAME {
            File other(File f) { return f; }
        },
        ABSOLUTE {
            File other(File f) { return f.getAbsoluteFile(); }
        },
        DIFFERENT {
            File other(File f) { return new File("not_" + f.getPath()); }
        },
        CASEEQUIV {
            File other(File f) { return new File(f.getPath().toUpperCase()); }
        };
        abstract File other(File f);
    };

    String[] paths = { "p/A.java", "p/B.java", "p/C.java" };

    public static void main(String... args) throws Exception {
        new T6838467().run();
    }

    void run() throws Exception {
        // on Windows, verify file system is not case significant
        if (System.getProperty("os.name").toLowerCase().startsWith("windows")
                && fileSystemIsCaseSignificant) {
            error("fileSystemIsCaseSignificant is set on Windows.");
        }

        // create a set of directories and zip files to compare
        createTestDir(new File("dir"), paths);
        createTestDir(new File("not_dir"), paths);
        createTestZip(new File("zip"), paths);
        createTestZip(new File("not_zip"), paths);
        if (fileSystemIsCaseSignificant) {
            createTestDir(new File("DIR"), paths);
            createTestZip(new File("ZIP"), paths);
        }

        // test the various sorts of file objects that can be obtained from
        // the file manager, and for various values that may or may not match.
        for (FileKind fk: FileKind.values()) {
            for (CompareKind ck: CompareKind.values()) {
                test(fk, ck);
            }
        }

        // verify that the various different types of file object were all
        // tested
        Set<String> expectClasses = new HashSet<String>(Arrays.asList(
                "RegularFileObject", "ZipFileObject", "ZipFileIndexFileObject" ));
        if (!foundClasses.equals(expectClasses)) {
            error("expected fileobject classes not found\n"
                    + "expected: " + expectClasses + "\n"
                    + "found: " + foundClasses);
        }

        if (errors > 0)
            throw new Exception(errors + " errors");
    }

    void test(FileKind fk, CompareKind ck) throws IOException {
        File f1 = fk.file;
        JavaFileManager fm1 = createFileManager(fk, f1);

        File f2 = ck.other(fk.file);
        JavaFileManager fm2 = createFileManager(fk, f2);

        try {
            // If the directories or zip files match, we expect "n" matches in
            // the "n-squared" comparisons to come, where "n" is the number of
            // entries in the the directories or zip files.
            // If the directories or zip files don't themselves match,
            // we obviously don't expect any of their contents to match either.
            int expect = (f1.getAbsoluteFile().equals(f2.getAbsoluteFile()) ? paths.length : 0);

            System.err.println("test " + (++count) + " " + fk + " " + ck + " " + f1 + " " + f2);
            test(fm1, fm2, expect);

        } finally {
            fm1.close();
            fm2.close();
        }
    }

    // For a pair of file managers that may or may not have similar entries
    // on the classpath, compare all files returned from one against all files
    // returned from the other.  For each pair of files, verify that if they
    // are equal, the hashcode is equal as well, and finally verify that the
    // expected number of matches was found.
    void test(JavaFileManager fm1, JavaFileManager fm2, int expectEqualCount) throws IOException {
        boolean foundFiles1 = false;
        boolean foundFiles2 = false;
        int foundEqualCount = 0;
        Set<JavaFileObject.Kind> kinds =  EnumSet.allOf(JavaFileObject.Kind.class);
        for (FileObject fo1: fm1.list(StandardLocation.CLASS_PATH, "p", kinds, false)) {
            foundFiles1 = true;
            foundClasses.add(fo1.getClass().getSimpleName());
            for (FileObject fo2: fm2.list(StandardLocation.CLASS_PATH, "p", kinds, false)) {
                foundFiles2 = true;
                foundClasses.add(fo1.getClass().getSimpleName());
                System.err.println("compare " + fo1 + " " + fo2);
                if (fo1.equals(fo2)) {
                    foundEqualCount++;
                    int hash1 = fo1.hashCode();
                    int hash2 = fo2.hashCode();
                    if (hash1 != hash2)
                        error("hashCode error: " + fo1 + " [" + hash1 + "] "
                                + fo2 + " [" + hash2 + "]");
                }
            }
        }
        if (!foundFiles1)
            error("no files found for file manager 1");
        if (!foundFiles2)
            error("no files found for file manager 2");
        // verify the expected number of matches were found
        if (foundEqualCount != expectEqualCount)
            error("expected matches not found: expected " + expectEqualCount + ", found " + foundEqualCount);
    }

    // create a file manager to test a FileKind, with a given directory
    // or zip file placed on the classpath
    JavaFileManager createFileManager(FileKind fk, File classpath) throws IOException {
        StandardJavaFileManager fm = createFileManager(fk == FileKind.ZIP);
        fm.setLocation(StandardLocation.CLASS_PATH, Arrays.asList(classpath));
        return fm;
    }

    JavacFileManager createFileManager(boolean useJavaUtilZip) {
        // javac should really not be using system properties like this
        // -- it should really be using (hidden) options -- but until then
        // take care to leave system properties as we find them, so as not
        // to adversely affect other tests that might follow.
        String prev = System.getProperty("useJavaUtilZip");
        boolean resetProperties = false;
        try {
            if (useJavaUtilZip) {
                System.setProperty("useJavaUtilZip", "true");
                resetProperties = true;
            } else if (System.getProperty("useJavaUtilZip") != null) {
                System.getProperties().remove("useJavaUtilZip");
                resetProperties = true;
            }

            Context c = new Context();
            return new JavacFileManager(c, false, null);
        } finally {
            if (resetProperties) {
                if (prev == null) {
                    System.getProperties().remove("useJavaUtilZip");
                } else {
                    System.setProperty("useJavaUtilZip", prev);
                }
            }
        }
    }

    // create a directory containing a given set of paths
    void createTestDir(File dir, String[] paths) throws IOException {
        for (String p: paths) {
            File file = new File(dir, p);
            file.getParentFile().mkdirs();
            FileWriter out = new FileWriter(file);
            try {
                out.write(p);
            } finally {
                out.close();
            }
        }
    }

    // create a sip file containing a given set of entries
    void createTestZip(File zip, String[] paths) throws IOException {
        if (zip.getParentFile() != null)
            zip.getParentFile().mkdirs();
        ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(zip));
        try {
            for (String p: paths) {
                ZipEntry ze = new ZipEntry(p);
                zos.putNextEntry(ze);
                byte[] bytes = p.getBytes();
                zos.write(bytes, 0, bytes.length);
                zos.closeEntry();
            }
        } finally {
            zos.close();
        }
    }

    void error(String msg) {
        System.err.println("Error: " + msg);
        errors++;
    }

    int count;
    int errors;
    Set<String> foundClasses = new HashSet<String>();
}