// Copyright (c) 2021, 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.apimodel;

import static com.android.tools.r8.apimodel.ApiModelingTestHelper.setMockApiLevelForClass;
import static com.android.tools.r8.apimodel.ApiModelingTestHelper.setMockApiLevelForDefaultInstanceInitializer;
import static com.android.tools.r8.apimodel.ApiModelingTestHelper.verifyThat;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assume.assumeTrue;

import com.android.tools.r8.CompilationMode;
import com.android.tools.r8.NeverInline;
import com.android.tools.r8.OutputMode;
import com.android.tools.r8.SingleTestRunResult;
import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestCompilerBuilder;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestParametersCollection;
import com.android.tools.r8.references.Reference;
import com.android.tools.r8.synthesis.globals.GlobalSyntheticsTestingConsumer;
import com.android.tools.r8.testing.AndroidBuildVersion;
import com.android.tools.r8.utils.AndroidApiLevel;
import com.android.tools.r8.utils.codeinspector.CodeInspector;
import java.nio.file.Path;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameter;
import org.junit.runners.Parameterized.Parameters;

@RunWith(Parameterized.class)
public class ApiModelMockClassTest extends TestBase {

  private final AndroidApiLevel mockLevel = AndroidApiLevel.M;

  @Parameter public TestParameters parameters;

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

  private boolean isGreaterOrEqualToMockLevel() {
    return parameters.isDexRuntime() && parameters.getApiLevel().isGreaterThanOrEqualTo(mockLevel);
  }

  private void setupTestCompileBuilder(TestCompilerBuilder<?, ?, ?, ?, ?> testBuilder) {
    testBuilder
        .addProgramClasses(Main.class, TestClass.class)
        .addLibraryClasses(LibraryClass.class)
        .addDefaultRuntimeLibrary(parameters)
        .setMinApi(parameters.getApiLevel())
        .apply(ApiModelingTestHelper::enableStubbingOfClasses)
        .apply(setMockApiLevelForClass(LibraryClass.class, mockLevel))
        .apply(setMockApiLevelForDefaultInstanceInitializer(LibraryClass.class, mockLevel));
  }

  private void setupTestRuntimeBuilder(TestCompilerBuilder<?, ?, ?, ?, ?> testBuilder) {
    testBuilder.setMinApi(parameters.getApiLevel()).addAndroidBuildVersion();
  }

  private void setupTestBuilder(TestCompilerBuilder<?, ?, ?, ?, ?> testBuilder) {
    setupTestCompileBuilder(testBuilder);
    setupTestRuntimeBuilder(testBuilder);
  }

  private boolean addToBootClasspath() {
    return parameters.isDexRuntime()
        && parameters.getRuntime().maxSupportedApiLevel().isGreaterThanOrEqualTo(mockLevel);
  }

  @Test
  public void testD8Debug() throws Exception {
    assumeTrue(parameters.isDexRuntime());
    testForD8()
        .setMode(CompilationMode.DEBUG)
        .apply(this::setupTestBuilder)
        .compile()
        .applyIf(addToBootClasspath(), b -> b.addBootClasspathClasses(LibraryClass.class))
        .run(parameters.getRuntime(), Main.class)
        .apply(this::checkOutput)
        .inspect(this::inspect);
  }

  @Test
  public void testD8Release() throws Exception {
    assumeTrue(parameters.isDexRuntime());
    testForD8()
        .setMode(CompilationMode.RELEASE)
        .apply(this::setupTestBuilder)
        .compile()
        .applyIf(addToBootClasspath(), b -> b.addBootClasspathClasses(LibraryClass.class))
        .run(parameters.getRuntime(), Main.class)
        .apply(this::checkOutput)
        .inspect(this::inspect);
  }

  @Test
  public void testD8MergeIndexed() throws Exception {
    assumeTrue(parameters.isDexRuntime());
    testD8Merge(OutputMode.DexIndexed);
  }

  @Test
  public void testD8MergeFilePerClass() throws Exception {
    assumeTrue(parameters.isDexRuntime());
    testD8Merge(OutputMode.DexFilePerClass);
  }

  @Test
  public void testD8MergeFilePerClassFile() throws Exception {
    assumeTrue(parameters.isDexRuntime());
    testD8Merge(OutputMode.DexFilePerClassFile);
  }

  public void testD8Merge(OutputMode outputMode) throws Exception {
    GlobalSyntheticsTestingConsumer globals = new GlobalSyntheticsTestingConsumer();
    Path incrementalOut =
        testForD8()
            .debug()
            .setOutputMode(outputMode)
            .setIntermediate(true)
            .apply(b -> b.getBuilder().setGlobalSyntheticsConsumer(globals))
            // TODO(b/213552119): Remove when enabled by default.
            .apply(ApiModelingTestHelper::enableApiCallerIdentification)
            .apply(this::setupTestCompileBuilder)
            .compile()
            .writeToZip();

    if (isGreaterOrEqualToMockLevel()) {
      assertFalse(globals.hasGlobals());
    } else if (outputMode == OutputMode.DexIndexed) {
      assertTrue(globals.hasGlobals());
      assertTrue(globals.isSingleGlobal());
    } else {
      assertTrue(globals.hasGlobals());
      // The TestClass does reference the mock and should have globals.
      assertNotNull(globals.getProvider(Reference.classFromClass(TestClass.class)));
      // The Main class does not have references to the mock and should have no globals.
      assertNull(globals.getProvider(Reference.classFromClass(Main.class)));
    }

    testForD8()
        .debug()
        .addProgramFiles(incrementalOut)
        .apply(b -> b.getBuilder().addGlobalSyntheticsResourceProviders(globals.getProviders()))
        .apply(this::setupTestRuntimeBuilder)
        .compile()
        .applyIf(addToBootClasspath(), b -> b.addBootClasspathClasses(LibraryClass.class))
        .run(parameters.getRuntime(), Main.class)
        .apply(this::checkOutput)
        .inspect(this::inspect);
  }

  @Test
  public void testR8() throws Exception {
    testForR8(parameters.getBackend())
        .apply(this::setupTestBuilder)
        .addKeepMainRule(Main.class)
        .enableInliningAnnotations()
        .compile()
        .applyIf(addToBootClasspath(), b -> b.addBootClasspathClasses(LibraryClass.class))
        .run(parameters.getRuntime(), Main.class)
        .apply(this::checkOutput)
        .inspect(this::inspect);
  }

  private void inspect(CodeInspector inspector) {
    verifyThat(inspector, parameters, LibraryClass.class).stubbedUntil(mockLevel);
  }

  private void checkOutput(SingleTestRunResult<?> runResult) {
    if (isGreaterOrEqualToMockLevel()) {
      runResult.assertSuccessWithOutputLines("LibraryClass::foo");
    } else {
      runResult.assertSuccessWithOutputLines("Hello World");
    }
  }

  // Only present from api level 23.
  public static class LibraryClass {

    // Do not model foo. If foo was modeled we would not stub.
    public void foo() {
      System.out.println("LibraryClass::foo");
    }
  }

  public static class TestClass {

    @NeverInline
    public static void test() {
      if (AndroidBuildVersion.VERSION >= 23) {
        new LibraryClass().foo();
      } else {
        System.out.println("Hello World");
      }
    }
  }

  public static class Main {

    public static void main(String[] args) {
      TestClass.test();
    }
  }
}