/*
 * Copyright 2000-2016 JetBrains s.r.o.
 *
 * 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 org.jetbrains.plugins.gradle.settings;

import com.intellij.openapi.components.PersistentStateComponent;
import com.intellij.openapi.components.ServiceManager;
import com.intellij.openapi.components.State;
import com.intellij.openapi.components.Storage;
import com.intellij.openapi.externalSystem.service.project.manage.ExternalProjectsManager;
import com.intellij.openapi.externalSystem.settings.AbstractExternalSystemSettings;
import com.intellij.openapi.externalSystem.settings.ExternalSystemSettingsListener;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Comparing;
import com.intellij.util.containers.ContainerUtilRt;
import com.intellij.util.xmlb.annotations.AbstractCollection;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.plugins.gradle.config.DelegatingGradleSettingsListenerAdapter;

import java.util.Set;

/**
 * Holds shared project-level gradle-related settings (should be kept at the '*.ipr' or under '.idea').
 *
 * @author peter
 */
@State(name = "GradleSettings", storages = @Storage("gradle.xml"))
public class GradleSettings extends AbstractExternalSystemSettings<GradleSettings, GradleProjectSettings, GradleSettingsListener>
  implements PersistentStateComponent<GradleSettings.MyState> {

  private final GradleSystemSettings mySystemSettings;

  public GradleSettings(@NotNull Project project) {
    super(GradleSettingsListener.TOPIC, project);
    mySystemSettings = GradleSystemSettings.getInstance();
  }

  @NotNull
  public static GradleSettings getInstance(@NotNull Project project) {
    return ServiceManager.getService(project, GradleSettings.class);
  }

  @Override
  public void subscribe(@NotNull ExternalSystemSettingsListener<GradleProjectSettings> listener) {
    getProject().getMessageBus().connect(getProject()).subscribe(GradleSettingsListener.TOPIC,
                                                                 new DelegatingGradleSettingsListenerAdapter(listener));
  }

  @Override
  protected void copyExtraSettingsFrom(@NotNull GradleSettings settings) {
  }

  @SuppressWarnings("unchecked")
  @Nullable
  @Override
  public GradleSettings.MyState getState() {
    MyState state = new MyState();
    fillState(state);
    return state;
  }

  @Override
  public void loadState(MyState state) {
    super.loadState(state);
  }

  /**
   * @return service directory path (if defined). 'Service directory' is a directory which is used internally by gradle during
   * calls to the tooling api. E.g. it holds downloaded binaries (dependency jars). We allow to define it because there
   * is a possible situation when a user wants to configure particular directory to be excluded from anti-virus protection
   * in order to increase performance
   */
  @Nullable
  public String getServiceDirectoryPath() {
    return mySystemSettings.getServiceDirectoryPath();
  }

  public void setServiceDirectoryPath(@Nullable String newPath) {
    String myServiceDirectoryPath = mySystemSettings.getServiceDirectoryPath();
    if (!Comparing.equal(myServiceDirectoryPath, newPath)) {
      mySystemSettings.setServiceDirectoryPath(newPath);
      getPublisher().onServiceDirectoryPathChange(myServiceDirectoryPath, newPath);
    }
  }

  @Nullable
  public String getGradleVmOptions() {
    return mySystemSettings.getGradleVmOptions();
  }

  public void setGradleVmOptions(@Nullable String gradleVmOptions) {
    String myGradleVmOptions = mySystemSettings.getGradleVmOptions();
    if (!Comparing.equal(myGradleVmOptions, gradleVmOptions)) {
      mySystemSettings.setGradleVmOptions(gradleVmOptions);
      getPublisher().onGradleVmOptionsChange(myGradleVmOptions, gradleVmOptions);
    }
  }

  public boolean isOfflineWork() {
    return mySystemSettings.isOfflineWork();
  }

  public void setOfflineWork(boolean isOfflineWork) {
    mySystemSettings.setOfflineWork(isOfflineWork);
  }

  @Override
  protected void checkSettings(@NotNull GradleProjectSettings old, @NotNull GradleProjectSettings current) {
    if (!Comparing.equal(old.getGradleHome(), current.getGradleHome())) {
      getPublisher().onGradleHomeChange(old.getGradleHome(), current.getGradleHome(), current.getExternalProjectPath());
    }
    if (old.getDistributionType() != current.getDistributionType()) {
      getPublisher().onGradleDistributionTypeChange(current.getDistributionType(), current.getExternalProjectPath());
    }
    if (old.isResolveModulePerSourceSet() != current.isResolveModulePerSourceSet()) {
      ExternalProjectsManager.getInstance(getProject()).getExternalProjectsWatcher().markDirty(current.getExternalProjectPath());
    }
  }

  public static class MyState implements State<GradleProjectSettings> {

    private Set<GradleProjectSettings> myProjectSettings = ContainerUtilRt.newTreeSet();

    @AbstractCollection(surroundWithTag = false, elementTypes = {GradleProjectSettings.class})
    public Set<GradleProjectSettings> getLinkedExternalProjectsSettings() {
      return myProjectSettings;
    }

    public void setLinkedExternalProjectsSettings(Set<GradleProjectSettings> settings) {
      if (settings != null) {
        myProjectSettings.addAll(settings);
      }
    }
  }
}