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

/**
 * This is a dummy project which does a local 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 esCheckoutDir = file("${buildDir}/bwc/checkout-es-5.x")
File xpackCheckoutDir = file("${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/5.x']
}

task checkoutXPackBwcBranch(type: LoggedExec) {
  dependsOn fetchXPackLatest
  workingDir = xpackCheckoutDir
  commandLine = ['git', 'checkout', 'upstream/5.x']
}

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
}