// Copyright 2018 Google LLC
//
// 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.cloud.deploymentmanager.autogen;

import static com.google.common.collect.Streams.stream;
import static java.nio.charset.StandardCharsets.UTF_8;
import static java.util.stream.Collectors.toList;

import com.google.cloud.deploymentmanager.autogen.Autogen.SharedSupportFilesStrategy;
import com.google.cloud.deploymentmanager.autogen.proto.DeploymentPackageAutogenSpec.DeploymentTool;
import com.google.cloud.deploymentmanager.autogen.proto.DeploymentPackageInput;
import com.google.cloud.deploymentmanager.autogen.proto.SolutionPackage;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.google.common.io.Files;
import com.google.inject.Guice;
import com.google.protobuf.TextFormat;
import java.io.File;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.stream.Stream;
import org.junit.runner.RunWith;
import org.junit.runners.Suite;
import org.junit.runners.Suite.SuiteClasses;

@RunWith(Suite.class)
@SuiteClasses({VerifySolutionFileSetTest.class, VerifyAutogenFileContent.class})
public class AutogenMediumTestsSuite {
  static final String RELATIVE_TESTDATA_PATH =
      "javatests/com/google/cloud/deploymentmanager/autogen/testdata/";

  static final Path TESTDATA_PATH =
      Path.of(
          System.getenv("TEST_SRCDIR"),
          System.getenv("TEST_WORKSPACE"),
          RELATIVE_TESTDATA_PATH);
  static final File ROOT = TESTDATA_PATH.toFile();

  static final Autogen AUTOGEN =
      Guice.createInjector(Autogen.getAutogenModule()).getInstance(Autogen.class);

  static class Solution {
    final String name;
    final File solutionFolder;
    final File goldenFolder;
    final Supplier<SolutionPackage> solutionPackage;

    static Collection<String[]> allSolutionsActualFilesDesc() {
      List<String[]> files = new ArrayList<>();
      for (Solution solution : findAllSolutions()) {
        for (SolutionPackage.File f : solution.solutionPackage.get().getFilesList()) {
          files.add(
              new String[] {
                solution.name, solution.goldenFolder.getPath(), f.getPath(), f.getContent()
              });
        }
      }
      return files;
    }

    /** Finds all solutions under testdata folder. */
    static Collection<Solution> findAllSolutions() {
      return stream(Files.fileTraverser().depthFirstPreOrder(ROOT))
          .filter(Files.isFile())
          .filter(f -> f.getName().matches("input.*\\.prototext"))
          .flatMap(Solution::getSolutions)
          .collect(toList());
    }
    
    static Stream<Solution> getSolutions(File inputSpecFile) {
      File solutionFolder = inputSpecFile.getParentFile();
      File dmGoldenFolder = new File(solutionFolder, "dm");
      File terraformGoldenFolder = new File(solutionFolder, "tf");
      if (!dmGoldenFolder.exists() && !terraformGoldenFolder.exists()) {
        throw new IllegalStateException(
            "No golden folder exists for either Deployment Manager or Terraform");
      }

      List<Solution> solutions = new ArrayList<>();
      if (dmGoldenFolder.exists()) {
        solutions.add(
            new Solution(
                inputSpecFile, solutionFolder, dmGoldenFolder, DeploymentTool.DEPLOYMENT_MANAGER));
      }

      if (terraformGoldenFolder.exists()) {
        solutions.add(
            new Solution(
                inputSpecFile, solutionFolder, terraformGoldenFolder, DeploymentTool.TERRAFORM));
      }

      return solutions.stream();
    }

    Solution(File inputSpecFile, File solutionFolder, File goldenFolder, DeploymentTool tool) {
      this.name = relativePathFunction(ROOT, inputSpecFile);
      this.solutionFolder = solutionFolder;
      this.goldenFolder = goldenFolder;
      this.solutionPackage =
          Suppliers.memoize(
              () -> {
                try {
                  DeploymentPackageInput.Builder input = DeploymentPackageInput.newBuilder();
                  TextFormat.getParser()
                      .merge(Files.asCharSource(inputSpecFile, UTF_8).read(), input);
                  input.getSpecBuilder().setDeploymentTool(tool);
                  return AUTOGEN.generateDeploymentPackage(
                      input.build(), SharedSupportFilesStrategy.INCLUDED);
                } catch (IOException e) {
                  throw new RuntimeException(e);
                }
              });
    }

    @Override
    public String toString() {
      return String.format(
          "Input spec: %s, golden: %s", this.name, relativePathFunction(ROOT, goldenFolder));
    }
  }

  public static String relativePathFunction(File parent, File f) {
    Path parentPath = Paths.get(parent.getAbsolutePath()).normalize();
    Path filePath = Paths.get(f.getAbsolutePath()).normalize();
    return parentPath.relativize(filePath).toString();
  }
}