// Copyright (c) 2018, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
package com.android.tools.r8.ir.optimize.checkcast;

import static com.android.tools.r8.utils.codeinspector.Matchers.isPresent;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.junit.Assert.assertEquals;

import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestParametersCollection;
import com.android.tools.r8.debug.CfDebugTestConfig;
import com.android.tools.r8.debug.DebugTestBase;
import com.android.tools.r8.debug.DebugTestConfig;
import com.android.tools.r8.debug.DexDebugTestConfig;
import com.android.tools.r8.utils.codeinspector.ClassSubject;
import com.android.tools.r8.utils.codeinspector.CodeInspector;
import com.android.tools.r8.utils.codeinspector.InstructionSubject;
import com.android.tools.r8.utils.codeinspector.MethodSubject;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Streams;
import java.nio.file.Path;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

@RunWith(Parameterized.class)
public class CheckCastDebugTestRunner extends DebugTestBase {

  private static final Class<?> MAIN = CheckCastDebugTest.class;

  private final TestParameters parameters;

  private Path r8Out;
  private CodeInspector inspector;

  @Parameterized.Parameters(name = "{0}")
  public static TestParametersCollection data() {
    return getTestParameters().withAllRuntimes().build();
  }

  public CheckCastDebugTestRunner(TestParameters parameters) {
    this.parameters = parameters;
  }

  @Before
  public void setUp() throws Exception {
    inspector =
        testForR8(parameters.getBackend())
            .addProgramClassesAndInnerClasses(A.class, B.class, C.class, MAIN)
            .addKeepMainRule(MAIN)
            .addOptionsModification(options -> options.enableVerticalClassMerging = false)
            .debug()
            .enableInliningAnnotations()
            .addDontObfuscate()
            .setMinApi(parameters.getRuntime())
            .compile()
            .writeToZip(this::setR8Out)
            .run(parameters.getRuntime(), MAIN)
            .assertSuccess()
            .inspector();

    ClassSubject classSubject = inspector.clazz(MAIN);
    assertThat(classSubject, isPresent());
  }

  private void setR8Out(Path path) {
    this.r8Out = path;
  }

  @Test
  public void test_differentLocals() throws Throwable {
    ClassSubject classSubject = inspector.clazz(MAIN);
    MethodSubject method = classSubject.method("void", "differentLocals", ImmutableList.of());
    assertThat(method, isPresent());
    long count =
        Streams.stream(method.iterateInstructions(InstructionSubject::isCheckCast)).count();
    assertEquals(0, count);

    DebugTestConfig config =
        parameters.isCfRuntime() ? new CfDebugTestConfig() : new DexDebugTestConfig();
    config.addPaths(r8Out);
    runDebugTest(config, MAIN.getCanonicalName(),
        // Object obj = new C();
        breakpoint(MAIN.getCanonicalName(), "differentLocals", "()V", 35),
        run(),
        checkNoLocal("obj"),
        checkNoLocal("a"),
        checkNoLocal("b"),
        checkNoLocal("c"),
        // A a = (A) obj;
        breakpoint(MAIN.getCanonicalName(), "differentLocals", "()V", 36),
        run(),
        checkLocal("obj"),
        checkNoLocal("a"),
        checkNoLocal("b"),
        checkNoLocal("c"),
        // B b = (B) a;
        breakpoint(MAIN.getCanonicalName(), "differentLocals", "()V", 37),
        run(),
        checkLocal("obj"),
        checkLocal("a"),
        checkNoLocal("b"),
        checkNoLocal("c"),
        // C c = (C) b;
        breakpoint(MAIN.getCanonicalName(), "differentLocals", "()V", 38),
        run(),
        checkLocal("obj"),
        checkLocal("a"),
        checkLocal("b"),
        checkNoLocal("c"),
        // System.out.println(c.toString());
        breakpoint(MAIN.getCanonicalName(), "differentLocals", "()V", 39),
        run(),
        checkLocal("obj"),
        checkLocal("a"),
        checkLocal("b"),
        checkLocal("c"),
        run()
    );
  }

  @Test
  public void test_sameLocal() throws Throwable {
    ClassSubject classSubject = inspector.clazz(MAIN);
    MethodSubject method = classSubject.method("void", "sameLocal", ImmutableList.of());
    assertThat(method, isPresent());
    long count =
        Streams.stream(method.iterateInstructions(InstructionSubject::isCheckCast)).count();
    assertEquals(0, count);

    DebugTestConfig config =
        parameters.isCfRuntime() ? new CfDebugTestConfig() : new DexDebugTestConfig();
    config.addPaths(r8Out);
    runDebugTest(config, MAIN.getCanonicalName(),
        // Object obj = new C();
        breakpoint(MAIN.getCanonicalName(), "sameLocal", "()V", 44),
        run(),
        checkNoLocal("obj"),
        // obj = (A) obj;
        breakpoint(MAIN.getCanonicalName(), "sameLocal", "()V", 45),
        run(),
        checkLocal("obj"),
        // obj = (B) obj;
        breakpoint(MAIN.getCanonicalName(), "sameLocal", "()V", 46),
        run(),
        checkLocal("obj"),
        // obj = (C) obj;
        breakpoint(MAIN.getCanonicalName(), "sameLocal", "()V", 47),
        run(),
        checkLocal("obj"),
        // System.out.println(obj.toString());
        breakpoint(MAIN.getCanonicalName(), "sameLocal", "()V", 48),
        run(),
        checkLocal("obj"),
        run()
    );
  }

}