/*
 * Copyright 2016 The Bazel Authors. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.idea.blaze.android.run.test;

import com.android.tools.idea.run.testing.AndroidTestRunConfiguration;
import com.google.common.base.Strings;
import com.google.idea.blaze.base.ideinfo.RuleIdeInfo;
import com.google.idea.blaze.base.model.primitives.Kind;
import com.google.idea.blaze.java.run.RunUtil;
import com.google.idea.blaze.java.run.producers.BlazeTestRunConfigurationProducer;
import com.google.idea.blaze.java.run.producers.JUnitConfigurationUtil;
import com.google.idea.blaze.java.run.producers.ProducerUtils;
import com.intellij.execution.JavaExecutionUtil;
import com.intellij.execution.Location;
import com.intellij.execution.actions.ConfigurationContext;
import com.intellij.execution.junit.JUnitUtil;
import com.intellij.openapi.util.Ref;
import com.intellij.psi.PsiClass;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiMethod;
import org.jetbrains.annotations.NotNull;

/**
 * Producer for run configurations related to Android test classes in Blaze.
 * <p/>
 * This class is based on
 * {@link org.jetbrains.plugins.gradle.execution.test.runner.TestClassGradleConfigurationProducer}.
 */
public class BlazeAndroidTestClassRunConfigurationProducer extends BlazeTestRunConfigurationProducer<BlazeAndroidTestRunConfiguration> {

  public BlazeAndroidTestClassRunConfigurationProducer() {
    super(BlazeAndroidTestRunConfigurationType.getInstance());
  }

  @Override
  protected boolean doSetupConfigFromContext(
    @NotNull BlazeAndroidTestRunConfiguration configuration,
    @NotNull ConfigurationContext context,
    @NotNull Ref<PsiElement> sourceElement) {

    final Location contextLocation = context.getLocation();
    assert contextLocation != null;
    final Location location = JavaExecutionUtil.stepIntoSingleClass(contextLocation);
    if (location == null) {
      return false;
    }

    if (JUnitConfigurationUtil.isMultipleElementsSelected(context)) {
      return false;
    }

    PsiClass testClass = JUnitUtil.getTestClass(location);
    if (testClass == null) {
      return false;
    }
    sourceElement.set(testClass);

    RuleIdeInfo rule = RunUtil.ruleForTestClass(context.getProject(), testClass, null);
    if (rule == null) {
      return false;
    }
    if (!rule.kindIsOneOf(Kind.ANDROID_TEST)) {
      return false;
    }
    configuration.setTarget(rule.label);
    BlazeAndroidTestRunConfigurationState configState = configuration.getConfigState();
    configState.TESTING_TYPE = AndroidTestRunConfiguration.TEST_CLASS;
    configState.CLASS_NAME = testClass.getQualifiedName();
    configuration.setGeneratedName();

    return true;
  }

  @Override
  protected boolean doIsConfigFromContext(
    @NotNull BlazeAndroidTestRunConfiguration configuration,
    @NotNull ConfigurationContext context) {

    final Location contextLocation = context.getLocation();
    assert contextLocation != null;
    final Location location = JavaExecutionUtil.stepIntoSingleClass(contextLocation);
    if (location == null) {
      return false;
    }

    if (JUnitConfigurationUtil.isMultipleElementsSelected(context)) {
      return false;
    }

    Location<PsiMethod> methodLocation = ProducerUtils.getMethodLocation(contextLocation);
    if (methodLocation != null) {
      return false;
    }

    PsiClass testClass = JUnitUtil.getTestClass(location);
    if (testClass == null) {
      return false;
    }

    return checkIfAttributesAreTheSame(configuration, testClass);
  }

  private static boolean checkIfAttributesAreTheSame(
    BlazeAndroidTestRunConfiguration configuration, PsiClass testClass) {
    BlazeAndroidTestRunConfigurationState configState = configuration.getConfigState();
    if (Strings.isNullOrEmpty(configState.CLASS_NAME)) {
      return false;
    }

    return configState.TESTING_TYPE == AndroidTestRunConfiguration.TEST_CLASS
           && configState.CLASS_NAME.equals(testClass.getQualifiedName());
  }
}