/*
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The ASF licenses this file to You 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.apache.geode.test.junit.rules;

import java.io.File;
import java.util.Arrays;
import java.util.Random;

import org.apache.commons.io.FileUtils;
import org.apache.commons.lang3.ArrayUtils;

import org.apache.geode.test.dunit.AsyncInvocation;
import org.apache.geode.test.dunit.SerializableCallableIF;
import org.apache.geode.test.dunit.SerializableRunnableIF;
import org.apache.geode.test.dunit.VM;
import org.apache.geode.test.dunit.rules.ClusterStartupRule;

public abstract class VMProvider {

  public static void invokeInEveryMember(SerializableRunnableIF runnableIF, VMProvider... members) {
    if (ArrayUtils.isEmpty(members)) {
      throw new IllegalArgumentException("Array of members must not be null nor empty.");
    }

    Arrays.stream(members).forEach(member -> member.invoke(runnableIF));
  }

  public static void invokeInRandomMember(SerializableRunnableIF runnableIF,
      VMProvider... members) {
    if (ArrayUtils.isEmpty(members)) {
      throw new IllegalArgumentException("Array of members must not be null nor empty.");
    }

    int randomMemberIndex = new Random().nextInt(members.length);
    members[randomMemberIndex].invoke(runnableIF);
  }

  public static void invokeInEveryMember(String name, SerializableRunnableIF runnableIF,
      VMProvider... members) {
    if (ArrayUtils.isEmpty(members)) {
      throw new IllegalArgumentException("Array of members must not be null nor empty.");
    }

    Arrays.stream(members).forEach(member -> member.invoke(name, runnableIF));
  }

  public abstract VM getVM();

  public void stop() {
    stop(true);
  }

  public void stop(boolean cleanWorkingDir) {
    getVM().invoke("stop cluster elements", () -> {
      // this did not clean up the files
      ClusterStartupRule.stopElementInsideVM();
      MemberStarterRule.disconnectDSIfAny();
    });

    // Clean up all files under working dir if requested - with null safety checks
    // getWorkingDir() may return null, and listFiles() may return null if directory doesn't exist
    // or I/O error occurs
    if (cleanWorkingDir) {
      File workingDir = getWorkingDir();
      if (workingDir != null && workingDir.exists()) {
        File[] files = workingDir.listFiles();
        if (files != null) {
          Arrays.stream(files).forEach(FileUtils::deleteQuietly);
        }
      }
    }
  }

  public boolean isClient() {
    return getVM().invoke("isClient", () -> ClusterStartupRule.clientCacheRule != null);
  }

  public boolean isLocator() {
    return getVM().invoke("isLocator",
        () -> ClusterStartupRule.memberStarter instanceof LocatorStarterRule);
  }

  // a server can be started without a cache server, so as long as this member has no locator,
  // it's deemed as a server
  public boolean isServer() {
    return getVM().invoke("isServer",
        () -> ClusterStartupRule.memberStarter instanceof ServerStarterRule);
  }

  public void invoke(final SerializableRunnableIF runnable) {
    getVM().invoke(runnable);
  }

  public <T> T invoke(final SerializableCallableIF<T> callable) {
    return getVM().invoke(callable);
  }

  public void invoke(String name, final SerializableRunnableIF runnable) {
    getVM().invoke(name, runnable);
  }

  public <T> T invoke(String name, final SerializableCallableIF<T> callable) {
    return getVM().invoke(name, callable);
  }

  public <T> AsyncInvocation<T> invokeAsync(final SerializableCallableIF<T> callable) {
    return getVM().invokeAsync(callable);
  }

  public <T> AsyncInvocation<T> invokeAsync(String name, final SerializableCallableIF<T> callable) {
    return getVM().invokeAsync(name, callable);
  }

  public AsyncInvocation<Void> invokeAsync(final SerializableRunnableIF runnable) {
    return getVM().invokeAsync(runnable);
  }

  public AsyncInvocation<Void> invokeAsync(String name, final SerializableRunnableIF runnable) {
    return getVM().invokeAsync(name, runnable);
  }

  public File getWorkingDir() {
    return getVM().getWorkingDirectory();
  }
}
