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/*

 * @test

 * @summary Testing start-up options.

 * @modules jdk.compiler/com.sun.tools.javac.api

 *          jdk.compiler/com.sun.tools.javac.main

 *          jdk.jshell/jdk.internal.jshell.tool

 * @library /tools/lib

 * @build Compiler ToolBox

 * @run testng StartOptionTest

 */

import java.io.ByteArrayOutputStream;

import java.io.PrintStream;

import java.nio.charset.StandardCharsets;

import java.nio.file.Path;

import java.util.function.Consumer;

import jdk.internal.jshell.tool.JShellTool;

import org.testng.annotations.AfterMethod;

import org.testng.annotations.BeforeMethod;

import org.testng.annotations.Test;

import static org.testng.Assert.assertEquals;

import static org.testng.Assert.assertTrue;

@Test

public class StartOptionTest {

    private ByteArrayOutputStream out;

    private ByteArrayOutputStream err;

    private JShellTool getShellTool() {

        return new JShellTool(null, new PrintStream(out), new PrintStream(err), null, null, null, null);

    }

    private String getOutput() {

        byte[] bytes = out.toByteArray();

        out.reset();

        return new String(bytes, StandardCharsets.UTF_8);

    }

    private String getError() {

        byte[] bytes = err.toByteArray();

        err.reset();

        return new String(bytes, StandardCharsets.UTF_8);

    }

    private void start(Consumer<String> checkOutput, Consumer<String> checkError, String... args) throws Exception {

        JShellTool tool = getShellTool();

        tool.start(args);

        if (checkOutput != null) {

            checkOutput.accept(getOutput());

        } else {

            assertEquals("", getOutput(), "Output: ");

        }

        if (checkError != null) {

            checkError.accept(getError());

        } else {

            assertEquals("", getError(), "Error: ");

        }

    }

    private void start(String expectedOutput, String expectedError, String... args) throws Exception {

        start(s -> assertEquals(s, expectedOutput, "Output: "), s -> assertEquals(s, expectedError, "Error: "), args);

    }

    @BeforeMethod

    public void setUp() {

        out = new ByteArrayOutputStream();

        err = new ByteArrayOutputStream();

    }

    @Test

    public void testUsage() throws Exception {

        start(s -> {

            assertTrue(s.split("\n").length >= 7, s);

            assertTrue(s.startsWith("Usage:   jshell <options>"), s);

        },  null, "-help");

    }

    @Test

    public void testUnknown() throws Exception {

        start(s -> {

            assertTrue(s.split("\n").length >= 7, s);

            assertTrue(s.startsWith("Usage:   jshell <options>"), s);

        }, s -> assertEquals(s, "Unknown option: -unknown\n"), "-unknown");

    }

    @Test(enabled = false) // TODO 8080883

    public void testStartup() throws Exception {

        Compiler compiler = new Compiler();

        Path p = compiler.getPath("file.txt");

        compiler.writeToFile(p);

        start("", "Argument to -startup missing.\n", "-startup");

        start("", "Conflicting -startup or -nostartup option.\n", "-startup", p.toString(), "-startup", p.toString());

        start("", "Conflicting -startup or -nostartup option.\n", "-nostartup", "-startup", p.toString());

        start("", "Conflicting -startup option.\n", "-startup", p.toString(), "-nostartup");

    }

    @Test

    public void testClasspath() throws Exception {

        for (String cp : new String[] {"-cp", "-classpath"}) {

            start("", "Conflicting -classpath option.\n", cp, ".", "-classpath", ".");

            start("", "Argument to -classpath missing.\n", cp);

        }

    }

    @Test

    public void testVersion() throws Exception {

        start(s -> assertTrue(s.startsWith("jshell")), null, "-version");

    }

    @AfterMethod

    public void tearDown() {

        out = null;

        err = null;

    }

}