/*
 * 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.java.libraries;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.idea.blaze.base.ideinfo.ArtifactLocation;
import com.google.idea.blaze.base.ideinfo.LibraryArtifact;
import com.google.idea.blaze.base.model.BlazeProjectData;
import com.google.idea.blaze.base.settings.BlazeUserSettings;
import com.google.idea.blaze.base.sync.data.BlazeProjectDataManager;
import com.google.idea.blaze.java.sync.model.BlazeLibrary;
import com.google.idea.blaze.java.sync.model.LibraryKey;
import com.google.idea.blaze.java.sync.projectstructure.LibraryEditor;
import com.intellij.codeInsight.AttachSourcesProvider;
import com.intellij.openapi.application.ApplicationManager;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.roots.LibraryOrderEntry;
import com.intellij.openapi.roots.impl.libraries.ProjectLibraryTable;
import com.intellij.openapi.roots.libraries.Library;
import com.intellij.openapi.roots.libraries.LibraryTable;
import com.intellij.openapi.util.ActionCallback;
import com.intellij.psi.PsiFile;
import com.intellij.util.ui.UIUtil;
import org.jetbrains.annotations.NotNull;

import java.util.Collection;
import java.util.List;

/**
 * @author Sergey Evdokimov
 */
public class BlazeAttachSourceProvider implements AttachSourcesProvider {
  private static final Logger LOG = Logger.getInstance(BlazeAttachSourceProvider.class);

  @NotNull
  @Override
  public Collection<AttachSourcesAction> getActions(List<LibraryOrderEntry> orderEntries, final PsiFile psiFile) {
    Project project = psiFile.getProject();
    BlazeProjectData blazeProjectData = BlazeProjectDataManager.getInstance(project).getBlazeProjectData();
    if (blazeProjectData == null) {
      return ImmutableList.of();
    }

    List<BlazeLibrary> librariesToAttachSourceTo = Lists.newArrayList();
    for (LibraryOrderEntry orderEntry : orderEntries) {
      Library library = orderEntry.getLibrary();
      if (library == null) {
        continue;
      }
      LibraryKey libraryKey = LibraryKey.fromIntelliJLibrary(library);
      if (SourceJarManager.getInstance(project).hasSourceJarAttached(libraryKey)) {
        continue;
      }
      BlazeLibrary blazeLibrary = LibraryActionHelper.findLibraryFromIntellijLibrary(project, library);
      if (blazeLibrary == null) {
        continue;
      }
      LibraryArtifact libraryArtifact = blazeLibrary.getLibraryArtifact();
      if (libraryArtifact == null) {
        continue;
      }
      ArtifactLocation artifactLocation = libraryArtifact.sourceJar;
      if (artifactLocation == null) {
        continue;
      }
      librariesToAttachSourceTo.add(blazeLibrary);
    }

    if (librariesToAttachSourceTo.isEmpty()) {
      return ImmutableList.of();
    }

    /**
     * Semi-hack: When sources are requested and we have them, we attach
     * them automatically if the corresponding user setting is active.
     */
    if (BlazeUserSettings.getInstance().getAttachSourcesOnDemand()) {
      UIUtil.invokeLaterIfNeeded(() -> {
        attachSources(project, librariesToAttachSourceTo);
      });
      return ImmutableList.of();
    }

    return ImmutableList.of(new AttachSourcesAction() {
      @Override
      public String getName() {
        return "Attach Blaze Source Jars";
      }

      @Override
      public String getBusyText() {
        return "Attaching source jars...";
      }

      @Override
      public ActionCallback perform(List<LibraryOrderEntry> orderEntriesContainingFile) {
        attachSources(project, librariesToAttachSourceTo);
        return ActionCallback.DONE;
      }
    });
  }

  static void attachSources(Project project, Collection<BlazeLibrary> librariesToAttachSourceTo) {
    ApplicationManager.getApplication().runWriteAction(() -> {
      LibraryTable libraryTable = ProjectLibraryTable.getInstance(project);
      LibraryTable.ModifiableModel libraryTableModel =
        libraryTable.getModifiableModel();
      for (BlazeLibrary blazeLibrary : librariesToAttachSourceTo) {
        // Make sure we don't do it twice
        if (SourceJarManager.getInstance(project).hasSourceJarAttached(blazeLibrary.getKey())) {
          continue;
        }
        LibraryEditor.updateLibrary(libraryTable, libraryTableModel, blazeLibrary, true);
        SourceJarManager.getInstance(project).setHasSourceJarAttached(blazeLibrary.getKey(), true);
      }
      libraryTableModel.commit();
    });
  }
}