/*
 * Copyright 2000-2013 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 jetbrains.buildServer.agent.ruby.rvm;

import com.intellij.openapi.util.Condition;
import java.io.File;
import java.util.*;
import jetbrains.buildServer.ExecResult;
import jetbrains.buildServer.agent.rakerunner.utils.FileUtil;
import jetbrains.buildServer.agent.rakerunner.utils.RunnerUtil;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.plugins.ruby.rvm.SharedRVMUtil;

import static org.jetbrains.plugins.ruby.rvm.SharedRVMUtil.Constants.RVM_GEMS_FOLDER_NAME;
import static org.jetbrains.plugins.ruby.rvm.SharedRVMUtil.Constants.RVM_RUBIES_FOLDER_NAME;

/**
 * @author Vladislav.Rassokhin
 */
public class InstalledRVM {
  @NotNull
  private final String myPath;
  @NotNull
  private final Type myType;

  @NotNull
  public String getPath() {
    return myPath;
  }

  @NotNull
  public Type getType() {
    return myType;
  }

  public enum Type {
    Local,
    Global,
    Special
  }

  public InstalledRVM(final @NotNull String path, final @NotNull Type type) {
    this.myPath = path;
    this.myType = type;
    determineRVMConfigData();
  }

  private void determineRVMConfigData() {
    // TODO: exec rvm for data collecting
  }

  @NotNull
  public Collection<String> getRubiesNames() {
    final List<String> rubies = new ArrayList<String>();
    String stdout = executeCommandLine(getExecutablePath(), "list", "strings");
    Collections.addAll(rubies, stdout.split("\n"));
    return rubies;
  }

  private String getExecutablePath() {
    return myPath + "/bin/rvm";
  }

  @NotNull
  public static String executeCommandLine(@NotNull final String... query) {
    final ExecResult output = RunnerUtil.run(null, null, query);
    return output.getStdout();
  }

  public boolean isRVMInterpreter(@NotNull final String executablePath) {
    // TODO: check via already fetched sdk names
    return executablePath.startsWith(getPath() + "/" + SharedRVMUtil.Constants.RVM_RUBIES_FOLDER_NAME);
  }

  @NotNull
  public SharedRVMUtil.RubyDistToGemsetTable getInterpreterDistName2GemSetsTable() {
    final String rubyGemsFolderPath = getGemsFolderPath();
    final String rubySdksRootPath = getSdksRootPath();

    if (!FileUtil.checkIfDirExists(rubyGemsFolderPath) || !FileUtil.checkIfDirExists(rubySdksRootPath)) {
      return SharedRVMUtil.RubyDistToGemsetTable.emptyTable();
    }

    final File rubyGemsFolder = new File(rubyGemsFolderPath);
    final File rubySdksRoot = new File(rubySdksRootPath);

    final HashSet<String> distSet = new HashSet<String>(Arrays.asList(rubySdksRoot.list()));
    if (distSet.isEmpty()) {
      return SharedRVMUtil.RubyDistToGemsetTable.emptyTable();
    }

    final Condition<String> isRVMDistCond = new Condition<String>() {
      public boolean value(final String distName) {
        return distSet.contains(distName);
      }
    };

    final SharedRVMUtil.RubyDistToGemsetTable rubyDist2Gemset = new SharedRVMUtil.RubyDistToGemsetTable();

    // 1. scan .rvm/gems directory and find all existing (sdk, gemset) pairs
    final File[] files = rubyGemsFolder.listFiles();
    if (files != null) for (File folder : files) {
      // ignore ordnary files
      if (!folder.isDirectory()) {
        continue;
      }

      // 2. Register if folder is a valid gempath for some sdk
      SharedRVMUtil.registerGemset(folder.getName(), isRVMDistCond, rubyDist2Gemset);
    }

    return rubyDist2Gemset;
  }

  private String getSdksRootPath() {
    // TODO: detect via environmert (may be non stadart or using mixed installation)
    return getPath() + File.separatorChar + RVM_RUBIES_FOLDER_NAME;
  }

  private String getGemsFolderPath() {
    // TODO: detect via environmert (may be non stadart or using mixed installation)
    return getPath() + File.separatorChar + RVM_GEMS_FOLDER_NAME;
  }
}