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/*

 * @test

 * @summary Testing external editor.

 * @modules jdk.jshell/jdk.internal.jshell.tool

 * @build ReplToolTesting CustomEditor EditorTestBase

 * @run testng ExternalEditorTest

 * @key intermittent

 */

import java.io.BufferedWriter;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.IOException;

import java.io.UncheckedIOException;

import java.net.ServerSocket;

import java.net.Socket;

import java.net.SocketTimeoutException;

import java.nio.charset.StandardCharsets;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.concurrent.ExecutionException;

import java.util.concurrent.Future;

import java.util.function.Consumer;

import org.testng.annotations.AfterClass;

import org.testng.annotations.BeforeClass;

import org.testng.annotations.Test;

import static org.testng.Assert.assertEquals;

import static org.testng.Assert.fail;

public class ExternalEditorTest extends EditorTestBase {

    private static Path executionScript;

    private static ServerSocket listener;

    private DataInputStream inputStream;

    private DataOutputStream outputStream;

    @Override

    public void writeSource(String s) {

        try {

            outputStream.writeInt(CustomEditor.SOURCE_CODE);

            byte[] bytes = s.getBytes(StandardCharsets.UTF_8);

            outputStream.writeInt(bytes.length);

            outputStream.write(bytes);

        } catch (IOException e) {

            throw new UncheckedIOException(e);

        }

    }

    @Override

    public String getSource() {

    }

    private void sendCode(int code) {

        try {

            outputStream.writeInt(code);

        } catch (IOException e) {

            throw new UncheckedIOException(e);

        }

    }

    @Override

    public void accept() {

        sendCode(CustomEditor.ACCEPT_CODE);

    }

    @Override

    public void exit() {

        sendCode(CustomEditor.EXIT_CODE);

        inputStream = null;

        outputStream = null;

    }

    @Override

    public void cancel() {

        sendCode(CustomEditor.CANCEL_CODE);

    }

    @Override

    public void testEditor(boolean defaultStartup, String[] args, ReplTest... tests) {

        ReplTest[] t = new ReplTest[tests.length + 1];

        t[0] = a -> assertCommandCheckOutput(a, "/set editor " + executionScript,

                assertStartsWith("|  Editor set to: " + executionScript));

        System.arraycopy(tests, 0, t, 1, tests.length);

        super.testEditor(defaultStartup, args, t);

    }

    @Test

    public void testStatementSemicolonAddition() {

        testEditor(

                a -> assertCommand(a, "if (true) {}", ""),

                a -> assertCommand(a, "if (true) {} else {}", ""),

                a -> assertCommand(a, "Object o", "o ==> null"),

                a -> assertCommand(a, "if (true) o = new Object() { int x; }", ""),

                a -> assertCommand(a, "if (true) o = new Object() { int y; }", ""),

                a -> assertCommand(a, "System.err.flush()", ""), // test still ; for expression statement

                a -> assertEditOutput(a, "/ed", "", () -> {

                    assertEquals(getSource(),

                            "if (true) {}\n" +

                            "if (true) {} else {}\n" +

                            "Object o;\n" +

                            "if (true) o = new Object() { int x; };\n" +

                            "if (true) o = new Object() { int y; };\n" +

                            "System.err.flush();\n");

                    exit();

                })

        );

    }

    private static boolean isWindows() {

        return System.getProperty("os.name").startsWith("Windows");

    }

    @BeforeClass

    public static void setUpExternalEditorTest() throws IOException {

        listener = new ServerSocket(0);

        listener.setSoTimeout(30000);

        int localPort = listener.getLocalPort();

        executionScript = Paths.get(isWindows() ? "editor.bat" : "editor.sh").toAbsolutePath();

        Path java = Paths.get(System.getProperty("java.home")).resolve("bin").resolve("java");

        try (BufferedWriter writer = Files.newBufferedWriter(executionScript)) {

            if(!isWindows()) {

                writer.append(java.toString()).append(" ")

                        .append(" -cp ").append(System.getProperty("java.class.path"))

                        .append(" CustomEditor ").append(Integer.toString(localPort)).append(" $@");

                executionScript.toFile().setExecutable(true);

            } else {

                writer.append(java.toString()).append(" ")

                        .append(" -cp ").append(System.getProperty("java.class.path"))

                        .append(" CustomEditor ").append(Integer.toString(localPort)).append(" %*");

            }

        }

    }

    private Future<?> task;

    @Override

    void assertEdit(boolean after, String cmd,

                           Consumer<String> checkInput, Consumer<String> checkOutput, Action action) {

        if (!after) {

            setCommandInput(cmd + "\n");

            task = getExecutor().submit(() -> {

                try (Socket socket = listener.accept()) {

                    inputStream = new DataInputStream(socket.getInputStream());

                    outputStream = new DataOutputStream(socket.getOutputStream());

                    checkInput.accept(getSource());

                    action.accept();

                } catch (SocketTimeoutException e) {

                    fail("Socket timeout exception.\n Output: " + getCommandOutput() +

                            "\n, error: " + getCommandErrorOutput());

                } catch (Throwable e) {

                    shutdownEditor();

                    if (e instanceof AssertionError) {

                        throw (AssertionError) e;

                    }

                    throw new RuntimeException(e);

                }

            });

        } else {

            try {

                task.get();

                checkOutput.accept(getCommandOutput());

            } catch (ExecutionException e) {

                if (e.getCause() instanceof AssertionError) {

                    throw (AssertionError) e.getCause();

                }

                throw new RuntimeException(e);

            } catch (Exception e) {

                throw new RuntimeException(e);

            }

        }

    }

    @Override

    public void shutdownEditor() {

        if (outputStream != null) {

            exit();

        }

    }

    @Test

    public void setUnknownEditor() {

        test(

                a -> assertCommand(a, "/set editor UNKNOWN", "|  Editor set to: UNKNOWN"),

                a -> assertCommand(a, "int a;", null),

                a -> assertCommandOutputStartsWith(a, "/ed 1",

                        "|  Edit Error:")

        );

    }

    @Test(enabled = false) // TODO 8159229

    public void testRemoveTempFile() {

        test(new String[]{"--no-startup"},

                a -> assertCommandCheckOutput(a, "/set editor " + executionScript,

                        assertStartsWith("|  Editor set to: " + executionScript)),

                a -> assertVariable(a, "int", "a", "0", "0"),

                a -> assertEditOutput(a, "/ed 1", assertStartsWith("|  Edit Error: Failure in read edit file:"), () -> {

                    sendCode(CustomEditor.REMOVE_CODE);

                    exit();

                }),

                a -> assertCommandCheckOutput(a, "/vars", assertVariables())

        );

    }

    @AfterClass

    public static void shutdown() throws IOException {

        executorShutdown();

        if (listener != null) {

            listener.close();

        }

    }

}