/*
 * 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 checkout of the previous
 * wire compat version's branch, and builds a snapshot. This allows backcompat
 * tests to test against the next unreleased version, closest to this version,
 * without relying on snapshots.
 */

String bwcVersion = wireCompatVersions[-1]
if (bwcVersion.endsWith('-SNAPSHOT')) {
  apply plugin: 'distribution'

  def (String major, String minor, String bugfix) = bwcVersion.split('\\.')
  String bwcBranch = bugfix == '0-SNAPSHOT' ? "${major}.x" : "${major}.${minor}"
  File checkoutDir = file("${buildDir}/bwc/checkout-${bwcBranch}")
  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) {
    onlyIf { project.gradle.startParameter.isOffline() == false }
    dependsOn addUpstream
    workingDir = checkoutDir
    commandLine = ['git', 'fetch', 'upstream']
  }

  task checkoutBwcBranch(type: LoggedExec) {
    dependsOn fetchLatest
    workingDir = checkoutDir
    commandLine = ['git', 'checkout', "upstream/${bwcBranch}"]
  }

  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
  }
}