/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the "Elastic License
 * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
 * Public License v 1"; you may not use this file except in compliance with, at
 * your election, the "Elastic License 2.0", the "GNU Affero General Public
 * License v3.0 only", or the "Server Side Public License, v 1".
 */

import org.elasticsearch.gradle.Version
import org.elasticsearch.gradle.testclusters.StandaloneRestIntegTestTask

Version elasticsearchVersion = Version.fromString(versions.get("elasticsearch"))
def fwcVersions = buildParams.bwcVersions.released.findAll { it.major == elasticsearchVersion.major &&  it.minor == elasticsearchVersion.minor }
def targetMajor = elasticsearchVersion.minor > 0 ? elasticsearchVersion.major : elasticsearchVersion.major - 1
def targetMinor = elasticsearchVersion.minor > 0 ? elasticsearchVersion.minor - 1 : buildParams.bwcVersions.unreleased.findAll { it.major == targetMajor }*.minor.max()
def previousMinorSnapshot = buildParams.bwcVersions.unreleased.find { it.major == targetMajor && it.minor == targetMinor }
if (previousMinorSnapshot != null) {
  fwcVersions.each { fwcVersion ->
    tasks.register("v${fwcVersion}#fwcTest", StandaloneRestIntegTestTask) {
      usesBwcDistribution(previousMinorSnapshot)
      usesBwcDistribution(fwcVersion)
      systemProperty("tests.old_cluster_version", previousMinorSnapshot)
      systemProperty("tests.new_cluster_version", fwcVersion)
      nonInputProperties.systemProperty 'tests.fwc', 'true'
    }
  }
}

gradle.taskGraph.whenReady { graph ->
  if (graph.allTasks.any { it.name.endsWith('#fwcTest') } && Boolean.parseBoolean(System.getProperty("tests.bwc.snapshot", "true"))) {
    throw new GradleException("Running forward compatibility tests requires passing `-Dtests.bwc.snapshot=false`.")
  }

  if (graph.allTasks.any { it.name.endsWith('#fwcTest') } && graph.allTasks.any { it.name.endsWith('#bwcTest') }) {
    throw new GradleException("Backward compatibility and forward compatibility tests cannot be executed in the same build.")
  }
}