/*
 * 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.runner;

import com.android.tools.idea.run.DeviceCount;
import com.android.tools.idea.run.LaunchCompatibility;
import com.android.tools.idea.run.TargetSelectionMode;
import com.android.tools.idea.run.ValidationError;
import com.android.tools.idea.run.editor.DeployTarget;
import com.android.tools.idea.run.editor.DeployTargetProvider;
import com.android.tools.idea.run.editor.DeployTargetState;
import com.google.common.collect.ImmutableMap;
import com.intellij.execution.ExecutionException;
import com.intellij.execution.Executor;
import com.intellij.execution.runners.ExecutionEnvironment;
import com.intellij.openapi.util.DefaultJDOMExternalizer;
import com.intellij.openapi.util.InvalidDataException;
import com.intellij.openapi.util.JDOMExternalizable;
import com.intellij.openapi.util.WriteExternalException;
import org.jdom.Element;
import org.jetbrains.android.facet.AndroidFacet;

import javax.annotation.Nullable;
import java.util.List;
import java.util.Map;

/**
 * Manages deploy target state for run configurations.
 */
public class BlazeAndroidRunConfigurationDeployTargetManager implements JDOMExternalizable {
  private static final String TARGET_SELECTION_MODE = TargetSelectionMode.SHOW_DIALOG.name();

  private final int runConfigId;
  private final boolean isAndroidTest;
  private final List<DeployTargetProvider> deployTargetProviders;
  private final Map<String, DeployTargetState> deployTargetStates;

  BlazeAndroidRunConfigurationDeployTargetManager(int runConfigId,
                                                  boolean isAndroidTest) {
    this.runConfigId = runConfigId;
    this.isAndroidTest = isAndroidTest;
    this.deployTargetProviders = DeployTargetProvider.getProviders();

    ImmutableMap.Builder<String, DeployTargetState> builder = ImmutableMap.builder();
    for (DeployTargetProvider provider : deployTargetProviders) {
      builder.put(provider.getId(), provider.createState());
    }
    this.deployTargetStates = builder.build();
  }

  List<ValidationError> validate(AndroidFacet facet) {
    return getCurrentDeployTargetState().validate(facet);
  }

  @Nullable
  DeployTarget getDeployTarget(Executor executor,
                               ExecutionEnvironment env,
                               AndroidFacet facet) throws ExecutionException {
    DeployTargetProvider currentTargetProvider = getCurrentDeployTargetProvider();

    DeployTarget deployTarget;
    if (currentTargetProvider.requiresRuntimePrompt()) {
      deployTarget = currentTargetProvider.showPrompt(
        executor,
        env,
        facet,
        getDeviceCount(),
        isAndroidTest,
        deployTargetStates,
        runConfigId,
        (device) -> LaunchCompatibility.YES
      );
      if (deployTarget == null) {
        return null;
      }
    }
    else {
      deployTarget = currentTargetProvider.getDeployTarget();
    }

    return deployTarget;
  }

  DeployTargetState getCurrentDeployTargetState() {
    DeployTargetProvider currentTarget = getCurrentDeployTargetProvider();
    return deployTargetStates.get(currentTarget.getId());
  }

  // TODO(salguarnieri) Currently the target selection mode is always SHOW_DIALOG. This code is here for future use.
  // If this code still isn't used after ASwB supports native, then we should delete this logic.
  private DeployTargetProvider getCurrentDeployTargetProvider() {
    DeployTargetProvider target = getDeployTargetProvider(TARGET_SELECTION_MODE);
    if (target == null) {
      target = getDeployTargetProvider(TargetSelectionMode.SHOW_DIALOG.name());
    }

    assert target != null;
    return target;
  }

  @Nullable
  private DeployTargetProvider getDeployTargetProvider(String id) {
    for (DeployTargetProvider target : deployTargetProviders) {
      if (target.getId().equals(id)) {
        return target;
      }
    }
    return null;
  }

  DeviceCount getDeviceCount() {
    return DeviceCount.SINGLE;
  }

  @Override
  public void readExternal(Element element) throws InvalidDataException {
    for (DeployTargetState state : deployTargetStates.values()) {
      DefaultJDOMExternalizer.readExternal(state, element);
    }
  }

  @Override
  public void writeExternal(Element element) throws WriteExternalException {
    for (DeployTargetState state : deployTargetStates.values()) {
      DefaultJDOMExternalizer.writeExternal(state, element);
    }
  }
}