/*
 * 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.base.scope.scopes;

import com.google.idea.blaze.base.scope.BlazeContext;
import com.google.idea.blaze.base.scope.BlazeScope;
import com.google.idea.blaze.base.settings.Blaze;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.project.ProjectManager;
import com.intellij.openapi.project.ProjectManagerListener;
import com.intellij.openapi.ui.Messages;
import org.jetbrains.annotations.NotNull;

/**
 * Prevents the user from closing the project while the scope is open.
 */
public class ProjectCloseScope implements ProjectManagerListener, BlazeScope {

  @NotNull
  private final Project project;

  private boolean isApplicationExitingOrProjectClosing;

  public ProjectCloseScope(@NotNull Project project) {
    this.project = project;
  }

  @Override
  public void onScopeBegin(@NotNull BlazeContext context) {
    ProjectManager projectManager = ProjectManager.getInstance();
    projectManager.addProjectManagerListener(project, this);
  }

  @Override
  public void onScopeEnd(@NotNull BlazeContext context) {
    ProjectManager projectManager = ProjectManager.getInstance();
    projectManager.removeProjectManagerListener(project, this);
  }

  @Override
  public void projectOpened(Project project) {
  }

  @Override
  public boolean canCloseProject(Project project) {
    if (!project.equals(this.project)) {
      return true;
    }
    if (shouldPromptUser()) {
      askUserToWait();
      return false;
    }
    return false;
  }

  @Override
  public void projectClosed(Project project) {
  }

  @Override
  public void projectClosing(Project project) {
    if (project.equals(this.project)) {
      isApplicationExitingOrProjectClosing = true;
    }
  }

  private boolean shouldPromptUser() {
    return !isApplicationExitingOrProjectClosing;
  }

  private void askUserToWait() {
    String buildSystem = Blaze.buildSystemName(project);
    Messages.showMessageDialog(project,
                               String.format("Please wait until %s command execution finishes", buildSystem),
                               buildSystem + " Running",
                               null);
  }
}