/*
 * 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.cpp;

import com.google.common.collect.ImmutableSet;
import com.google.idea.blaze.base.io.VirtualFileSystemProvider;
import com.google.idea.blaze.base.model.BlazeProjectData;
import com.google.idea.blaze.base.model.primitives.LanguageClass;
import com.google.idea.blaze.base.model.primitives.WorkspaceRoot;
import com.google.idea.blaze.base.model.primitives.WorkspaceType;
import com.google.idea.blaze.base.projectview.ProjectViewSet;
import com.google.idea.blaze.base.scope.BlazeContext;
import com.google.idea.blaze.base.scope.Scope;
import com.google.idea.blaze.base.scope.scopes.TimingScope;
import com.google.idea.blaze.base.sync.BlazeSyncPlugin;
import com.google.idea.common.experiments.BoolExperiment;
import com.intellij.openapi.module.Module;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.vfs.VfsUtil;
import com.intellij.openapi.vfs.VirtualFile;
import com.jetbrains.cidr.lang.workspace.OCWorkspace;
import java.util.Set;

final class BlazeCSyncPlugin extends BlazeSyncPlugin.Adapter {

  private static final BoolExperiment refreshExecRoot =
      new BoolExperiment("refresh.exec.root.cpp", true);

  @Override
  public Set<LanguageClass> getSupportedLanguagesInWorkspace(WorkspaceType workspaceType) {
    if (workspaceType == WorkspaceType.C) {
      return ImmutableSet.of(LanguageClass.C);
    }
    return ImmutableSet.of();
  }

  @Override
  public void updateInMemoryState(
      Project project,
      BlazeContext context,
      WorkspaceRoot workspaceRoot,
      ProjectViewSet projectViewSet,
      BlazeProjectData blazeProjectData,
      Module workspaceModule) {
    if (!blazeProjectData.workspaceLanguageSettings.isLanguageActive(LanguageClass.C)) {
      return;
    }

    Scope.push(
        context,
        childContext -> {
          childContext.push(new TimingScope("Setup C Workspace"));

          OCWorkspace workspace = OCWorkspaceProvider.getWorkspace(project);
          if (workspace instanceof BlazeCWorkspace) {
            BlazeCWorkspace blazeCWorkspace = (BlazeCWorkspace) workspace;
            blazeCWorkspace.update(childContext, workspaceRoot, projectViewSet, blazeProjectData);
          }
        });
  }

  @Override
  public void refreshVirtualFileSystem(BlazeProjectData blazeProjectData) {
    if (!refreshExecRoot.getValue()) {
      return;
    }
    refreshExecRoot(blazeProjectData);
  }

  private static void refreshExecRoot(BlazeProjectData blazeProjectData) {
    // recursive refresh of the blaze execution root. This is required because:
    // <li>Our blaze aspect can't tell us exactly which genfiles are required to resolve the project
    // <li>Cidr caches the directory contents as part of symbol building, so we need to do this work
    // up front.
    VirtualFile execRoot =
        VirtualFileSystemProvider.getInstance()
            .getSystem()
            .refreshAndFindFileByIoFile(blazeProjectData.blazeInfo.getExecutionRoot());
    if (execRoot != null) {
      VfsUtil.markDirtyAndRefresh(false, true, true, execRoot);
    }
  }
}