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 * Copyright (c) 2015, 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.

 *

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 */

/*

 * @test

 * @summary Test Command Completion

 * @library /tools/lib

 * @build ReplToolTesting TestingInputStream Compiler ToolBox

 * @run testng CommandCompletionTest

 */

import java.io.IOException;

import java.nio.file.FileSystems;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.Collections;

import java.util.List;

import java.util.function.Predicate;

import java.util.stream.Collectors;

import java.util.stream.Stream;

import org.testng.annotations.Test;

@Test

public class CommandCompletionTest extends ReplToolTesting {

    public void testCommand() {

        assertCompletion("/f|", false, "/feedback ");

        assertCompletion("/deb|", false);

        assertCompletion("/feedback v|", false, "verbose");

        assertCompletion("/c|", false, "/classes ", "/classpath ");

        assertCompletion("/h|", false, "/help ", "/history ");

        assertCompletion("/feedback |", false,

                "?", "concise", "default", "normal", "off", "verbose");

    }

    public void testList() {

        assertCompletion("/l|", false, "/list ");

        assertCompletion("/list |", false, "all");

        assertCompletion("/list q|", false);

    }

    public void testDrop() {

        assertCompletion("/d|", false, "/drop ");

        test(false, new String[] {"-nostartup"},

                a -> assertClass(a, "class cTest {}", "class", "cTest"),

                a -> assertMethod(a, "int mTest() { return 0; }", "()I", "mTest"),

                a -> assertVariable(a, "int", "fTest"),

                a -> assertCompletion(a, "/drop |", false, "1", "2", "3", "cTest", "fTest", "mTest"),

                a -> assertCompletion(a, "/drop f|", false, "fTest")

        );

    }

    public void testEdit() {

        assertCompletion("/e|", false, "/edit ", "/exit ");

        assertCompletion("/ed|", false, "/edit ");

        test(false, new String[]{"-nostartup"},

                a -> assertClass(a, "class cTest {}", "class", "cTest"),

                a -> assertMethod(a, "int mTest() { return 0; }", "()I", "mTest"),

                a -> assertVariable(a, "int", "fTest"),

                a -> assertCompletion(a, "/edit |", false, "1", "2", "3", "cTest", "fTest", "mTest"),

                a -> assertCompletion(a, "/edit f|", false, "fTest")

        );

    }

    public void testOpen() throws IOException {

        Compiler compiler = new Compiler();

        assertCompletion("/o|", false, "/open ");

        List<String> p1 = listFiles(Paths.get(""));

        FileSystems.getDefault().getRootDirectories().forEach(s -> p1.add(s.toString()));

        Collections.sort(p1);

        assertCompletion("/open |", false, p1.toArray(new String[p1.size()]));

        Path classDir = compiler.getClassDir();

        List<String> p2 = listFiles(classDir);

        assertCompletion("/open " + classDir + "/|", false, p2.toArray(new String[p2.size()]));

    }

    public void testSave() throws IOException {

        Compiler compiler = new Compiler();

        List<String> p1 = listFiles(Paths.get(""));

        FileSystems.getDefault().getRootDirectories().forEach(s -> p1.add(s.toString()));

        Collections.sort(p1);

        assertCompletion("/save |", false, p1.toArray(new String[p1.size()]));

        Path classDir = compiler.getClassDir();

        List<String> p2 = listFiles(classDir);

        assertCompletion("/save " + classDir + "/|",

                false, p2.toArray(new String[p2.size()]));

        assertCompletion("/save all " + classDir + "/|",

                false, p2.toArray(new String[p2.size()]));

    }

    public void testClassPath() throws IOException {

        assertCompletion("/classp|", false, "/classpath ");

        Compiler compiler = new Compiler();

        Path outDir = compiler.getPath("testClasspathCompletion");

        Files.createDirectories(outDir);

        Files.createDirectories(outDir.resolve("dir"));

        createIfNeeded(outDir.resolve("test.jar"));

        createIfNeeded(outDir.resolve("test.zip"));

        compiler.compile(outDir, "package pkg; public class A { public String toString() { return \"A\"; } }");

        String jarName = "test.jar";

        compiler.jar(outDir, jarName, "pkg/A.class");

        compiler.getPath(outDir).resolve(jarName);

        List<String> paths = listFiles(outDir, CLASSPATH_FILTER);

        assertCompletion("/classpath " + outDir + "/|", false, paths.toArray(new String[paths.size()]));

    }

    public void testUserHome() throws IOException {

        List<String> completions;

        Path home = Paths.get(System.getProperty("user.home"));

        try (Stream<Path> content = Files.list(home)) {

            completions = content.filter(CLASSPATH_FILTER)

                                 .map(file -> file.getFileName().toString() + (Files.isDirectory(file) ? "/" : ""))

                                 .sorted()

                                 .collect(Collectors.toList());

        }

        assertCompletion("/classpath ~/|", false, completions.toArray(new String[completions.size()]));

    }

    private void createIfNeeded(Path file) throws IOException {

        if (!Files.exists(file))

            Files.createFile(file);

    }

    private List<String> listFiles(Path path) throws IOException {

        return listFiles(path, ACCEPT_ALL);

    }

    private List<String> listFiles(Path path, Predicate<? super Path> filter) throws IOException {

        try (Stream<Path> stream = Files.list(path)) {

            return stream.filter(filter)

                         .map(p -> p.getFileName().toString() + (Files.isDirectory(p) ? "/" : ""))

                         .sorted()

                         .collect(Collectors.toList());

        }

    }

    private static final Predicate<? super Path> ACCEPT_ALL =

            (file) -> !file.endsWith(".") && !file.endsWith("..");

    private static final Predicate<? super Path> CLASSPATH_FILTER =

            (file) -> ACCEPT_ALL.test(file) &&

                    (Files.isDirectory(file) ||

                     file.getFileName().toString().endsWith(".jar") ||

                     file.getFileName().toString().endsWith(".zip"));

}