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 esCheckoutDir = file("${buildDir}/bwc/checkout-es-${bwcBranch}")
  File xpackCheckoutDir = file("${esCheckoutDir}-extra/x-pack-elasticsearch")
  task createElasticsearchClone(type: LoggedExec) {
    onlyIf { esCheckoutDir.exists() == false }
    commandLine = ['git', 'clone', rootDir, esCheckoutDir]
  }

  task createXPackClone(type: LoggedExec) {
    onlyIf { xpackCheckoutDir.exists() == false }
    commandLine = ['git', 'clone', project(':x-pack-elasticsearch').projectDir, xpackCheckoutDir]
  }

  // we use regular Exec here to ensure we always get output, regardless of logging level
  task findElasticsearchUpstream(type: Exec) {
    dependsOn createElasticsearchClone
    workingDir = esCheckoutDir
    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.esUpstreamExists = false
      output.toString('UTF-8').eachLine {
        if (it.contains("upstream")) {
          project.ext.esUpstreamExists = true
        }
      }
    }
  }

  task findXPackUpstream(type: Exec) {
    dependsOn createXPackClone
    workingDir = xpackCheckoutDir
    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.xpackUpstreamExists = false
      output.toString('UTF-8').eachLine {
        if (it.contains("upstream")) {
          project.ext.xpackUpstreamExists = true
        }
      }
    }
  }

  task addElasticsearchUpstream(type: LoggedExec) {
    dependsOn findElasticsearchUpstream
    onlyIf { project.ext.esUpstreamExists == false }
    workingDir = esCheckoutDir
    commandLine = ['git', 'remote', 'add', 'upstream', 'git@github.com:elastic/elasticsearch.git']
  }

  task addXPackUpstream(type: LoggedExec) {
    dependsOn findXPackUpstream
    onlyIf { project.ext.xpackUpstreamExists == false }
    workingDir = xpackCheckoutDir
    commandLine = ['git', 'remote', 'add', 'upstream', 'git@github.com:elastic/x-pack-elasticsearch.git']
  }

  task fetchElasticsearchLatest(type: LoggedExec) {
    dependsOn addElasticsearchUpstream
    workingDir = esCheckoutDir
    commandLine = ['git', 'fetch', 'upstream']
  }

  task fetchXPackLatest(type: LoggedExec) {
    dependsOn addXPackUpstream
    workingDir = xpackCheckoutDir
    commandLine = ['git', 'fetch', 'upstream']
  }

  task checkoutElasticsearchBwcBranch(type: LoggedExec) {
    dependsOn fetchElasticsearchLatest
    workingDir = esCheckoutDir
    commandLine = ['git', 'checkout', "upstream/${bwcBranch}"]
  }

  task checkoutXPackBwcBranch(type: LoggedExec) {
    dependsOn fetchXPackLatest
    workingDir = xpackCheckoutDir
    commandLine = ['git', 'checkout', "upstream/${bwcBranch}"]
  }

  File bwcZip = file("${xpackCheckoutDir}/plugin/build/distributions/x-pack-${bwcVersion}.zip")
  task buildBwcVersion(type: GradleBuild) {
    dependsOn checkoutXPackBwcBranch, checkoutElasticsearchBwcBranch
    dir = xpackCheckoutDir
    tasks = [':x-pack-elasticsearch:plugin:assemble']
  }

  artifacts {
    'default' file: bwcZip, name: 'x-pack', type: 'zip', builtBy: buildBwcVersion
  }
}