/*

 * 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.

 *

 * 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

 * @summary Test custom id generators

 * @build KullaTesting TestingInputStream

 * @run testng IdGeneratorTest

 */

import java.io.ByteArrayOutputStream;

import java.io.PrintStream;

import java.util.List;

import java.util.function.Supplier;

import jdk.jshell.EvalException;

import jdk.jshell.JShell;

import jdk.jshell.SnippetEvent;

import jdk.jshell.UnresolvedReferenceException;

import jdk.jshell.VarSnippet;

import org.testng.annotations.Test;

import static org.testng.Assert.assertEquals;

import static org.testng.Assert.assertTrue;

@Test

public class IdGeneratorTest {

    public JShell.Builder getBuilder() {

        TestingInputStream inStream = new TestingInputStream();

        ByteArrayOutputStream outStream = new ByteArrayOutputStream();

        ByteArrayOutputStream errStream = new ByteArrayOutputStream();

        return JShell.builder()

                .in(inStream)

                .out(new PrintStream(outStream))

                .err(new PrintStream(errStream));

    }

    public void testTempNameGenerator() {

        JShell.Builder builder = getBuilder().tempVariableNameGenerator(new Supplier<String>() {

            int count = 0;

            @Override

            public String get() {

                return "temp" + ++count;

            }

        });

        try (JShell jShell = builder.build()) {

            for (int i = 0; i < 3; ++i) {

                VarSnippet v = (VarSnippet) jShell.eval("2 + " + (i + 1)).get(0).snippet();

                assertEquals("temp" + (i + 1), v.name(), "Custom id: ");

            }

        }

    }

    public void testResetTempNameGenerator() {

        JShell.Builder builder = getBuilder().tempVariableNameGenerator(() -> {

            throw new AssertionError("Should not be called");

        });

        try (JShell jShell = builder.tempVariableNameGenerator(null).build()) {

            jShell.eval("2 + 2");

        }

    }

    public void testIdGenerator() {

        JShell.Builder builder = getBuilder().idGenerator(((snippet, id) -> "custom" + id));

        try (JShell jShell = builder.build()) {

            List<SnippetEvent> eval = jShell.eval("int a, b;");

            checkIds(eval);

            checkIds(jShell.drop(eval.get(0).snippet()));

        }

    }

    private void checkIds(List<SnippetEvent> events) {

        for (SnippetEvent event : events) {

            assertTrue(event.snippet().id().startsWith("custom"), "Not started with \"custom\": "

                    + event.snippet().id());

        }

    }

    public void testIdInException() {

        JShell.Builder builder = getBuilder().idGenerator(((snippet, id) -> "custom" + id));

        try (JShell jShell = builder.build()) {

            EvalException evalException = (EvalException) jShell.eval("throw new Error();").get(0).exception();

            for (StackTraceElement ste : evalException.getStackTrace()) {

                assertTrue(ste.getFileName().startsWith("#custom"), "Not started with \"#custom\": "

                        + ste.getFileName());

            }

            jShell.eval("void f() { g(); }");

            UnresolvedReferenceException unresolvedException = (UnresolvedReferenceException) jShell.eval("f();").get(0).exception();

            for (StackTraceElement ste : unresolvedException.getStackTrace()) {

                assertTrue(ste.getFileName().startsWith("#custom"), "Not started with \"#custom\": "

                        + ste.getFileName());

            }

        }

    }

    public void testResetIdGenerator() {

        JShell.Builder builder = getBuilder().idGenerator((sn, id) -> {

            throw new AssertionError("Should not be called");

        });

        try (JShell jShell = builder.idGenerator(null).build()) {

            jShell.eval("2 + 2");

        }

    }

}