/*
 * Copyright 2000-2014 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.jps.gradle.compiler;

import com.intellij.openapi.util.Ref;
import com.intellij.openapi.util.io.FileUtil;
import com.intellij.openapi.util.io.FileUtilRt;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.jps.builders.BuildOutputConsumer;
import org.jetbrains.jps.builders.DirtyFilesHolder;
import org.jetbrains.jps.builders.FileProcessor;
import org.jetbrains.jps.builders.storage.BuildDataPaths;
import org.jetbrains.jps.gradle.model.JpsGradleExtensionService;
import org.jetbrains.jps.gradle.model.impl.*;
import org.jetbrains.jps.incremental.CompileContext;
import org.jetbrains.jps.incremental.ProjectBuildException;
import org.jetbrains.jps.incremental.TargetBuilder;
import org.jetbrains.jps.incremental.messages.ProgressMessage;

import java.io.File;
import java.io.IOException;
import java.util.*;

/**
 * @author Vladislav.Soroka
 * @since 7/10/2014
 */
public class GradleResourcesBuilder extends TargetBuilder<GradleResourceRootDescriptor, GradleResourcesTarget> {
  public static final String BUILDER_NAME = "Gradle Resources Compiler";

  public GradleResourcesBuilder() {
    super(Arrays.asList(GradleResourcesTargetType.PRODUCTION, GradleResourcesTargetType.TEST));
  }

  @Override
  public void build(@NotNull final GradleResourcesTarget target,
                    @NotNull final DirtyFilesHolder<GradleResourceRootDescriptor, GradleResourcesTarget> holder,
                    @NotNull final BuildOutputConsumer outputConsumer,
                    @NotNull final CompileContext context) throws ProjectBuildException, IOException {
    final BuildDataPaths dataPaths = context.getProjectDescriptor().dataManager.getDataPaths();
    final GradleProjectConfiguration projectConfig = JpsGradleExtensionService.getInstance().getGradleProjectConfiguration(dataPaths);
    final GradleModuleResourceConfiguration config = target.getModuleResourcesConfiguration(dataPaths);
    if (config == null) return;

    final Map<GradleResourceRootDescriptor, List<File>> files = new HashMap<GradleResourceRootDescriptor, List<File>>();

    holder.processDirtyFiles(new FileProcessor<GradleResourceRootDescriptor, GradleResourcesTarget>() {

      @Override
      public boolean apply(GradleResourcesTarget t, File file, GradleResourceRootDescriptor rd) throws IOException {
        assert target == t;

        List<File> fileList = files.get(rd);
        if (fileList == null) {
          fileList = new ArrayList<File>();
          files.put(rd, fileList);
        }

        fileList.add(file);
        return true;
      }
    });

    GradleResourceRootDescriptor[] roots = files.keySet().toArray(new GradleResourceRootDescriptor[files.keySet().size()]);
    Arrays.sort(roots, new Comparator<GradleResourceRootDescriptor>() {
      @Override
      public int compare(GradleResourceRootDescriptor r1, GradleResourceRootDescriptor r2) {
        int res = r1.getIndexInPom() - r2.getIndexInPom();
        if (r1.isOverwrite()) {
          assert r2.isOverwrite();
          return res;
        }

        if (r1.getConfiguration().isFiltered && !r2.getConfiguration().isFiltered) return 1;
        if (!r1.getConfiguration().isFiltered && r2.getConfiguration().isFiltered) return -1;

        if (!r1.getConfiguration().isFiltered) {
          res = -res;
        }

        return res;
      }
    });

    GradleResourceFileProcessor fileProcessor = new GradleResourceFileProcessor(projectConfig, target.getModule().getProject(), config);

    for (GradleResourceRootDescriptor rd : roots) {
      for (File file : files.get(rd)) {

        String relPath = FileUtil.getRelativePath(rd.getRootFile(), file);
        if (relPath == null) continue;

        final File outputDir =
          GradleResourcesTarget.getOutputDir(target.getModuleOutputDir(), rd.getConfiguration(), config.outputDirectory);
        if (outputDir == null) continue;

        context.processMessage(new ProgressMessage("Copying resources... [" + target.getModule().getName() + "]"));

        final Ref<File> fileRef = Ref.create(new File(outputDir, relPath));
        fileProcessor.copyFile(file, fileRef, rd.getConfiguration(), context, FileUtilRt.ALL_FILES);
        outputConsumer.registerOutputFile(fileRef.get(), Collections.singleton(file.getPath()));

        if (context.getCancelStatus().isCanceled()) return;
      }
    }

    context.checkCanceled();
    context.processMessage(new ProgressMessage(""));
  }

  @NotNull
  public String getPresentableName() {
    return BUILDER_NAME;
  }
}