/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.
 */

import java.util.regex.Matcher
import org.elasticsearch.gradle.LoggedExec

/**
 * This is a dummy project which does a local worktree checkout of the previous
 * major version's stable branch, and builds a snapshot. This allows backcompat
 * tests in the next major version to test against the next unreleased minor
 * version, without relying on snapshots.
 */

apply plugin: 'distribution'

File checkoutDir = file("${buildDir}/bwc/checkout-5.x")
task createClone(type: LoggedExec) {
  onlyIf { checkoutDir.exists() == false }
  commandLine = ['git', 'clone', rootDir, checkoutDir]
}

// we use regular Exec here to ensure we always get output, regardless of logging level
task findUpstream(type: Exec) {
  dependsOn createClone
  workingDir = checkoutDir
  commandLine = ['git', 'remote', '-v']
  ignoreExitValue = true
  ByteArrayOutputStream output = new ByteArrayOutputStream()
  standardOutput = output
  doLast {
    if (execResult.exitValue != 0) {
      output.toString('UTF-8').eachLine { line -> logger.error(line) }
      execResult.assertNormalExitValue()
    }
    project.ext.upstreamExists = false
    output.toString('UTF-8').eachLine {
      if (it.contains("upstream")) {
        project.ext.upstreamExists = true
      }
    }
  }
}

task addUpstream(type: LoggedExec) {
  dependsOn findUpstream
  onlyIf { project.ext.upstreamExists == false }
  workingDir = checkoutDir
  commandLine = ['git', 'remote', 'add', 'upstream', 'https://github.com/elastic/elasticsearch.git']
}

task fetchLatest(type: LoggedExec) {
  dependsOn addUpstream
  workingDir = checkoutDir
  commandLine = ['git', 'fetch', 'upstream']
}

task checkoutBwcBranch(type: LoggedExec) {
  dependsOn fetchLatest
  workingDir = checkoutDir
  commandLine = ['git', 'checkout', 'upstream/5.x']
}

File bwcZip = file("${checkoutDir}/distribution/zip/build/distributions/elasticsearch-${bwcVersion}.zip")
task buildBwcVersion(type: GradleBuild) {
  dependsOn checkoutBwcBranch
  dir = checkoutDir
  tasks = [':distribution:zip:assemble']
}

artifacts {
  'default' file: bwcZip, name: 'elasticsearch', type: 'zip', builtBy: buildBwcVersion
}