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

/**
 * Subdirectories of this project are dummy projects which does a local
 * checkout of the appropriate version's branch, and builds a snapshot. This
 * allows backcompat tests to test against the next unreleased versions
 * without relying on snapshots.
 */

subprojects {
  String bwcVersion
  boolean enabled = true
  if (project.name == 'stable-snapshot') {
    /* bwc-stable is only used if the last version is on a stable branch instead
     * of a release branch */
    enabled = indexCompatVersions[-1].bugfix == 0
    bwcVersion = indexCompatVersions[-1]
  } else if (project.name == 'release-snapshot') {
    if (indexCompatVersions[-1].bugfix == 0) {
      /* The last version is on a stable branch so it is handled by the bwc-stable
       * project. This project will instead handle the version before that which
       * *should* be on a release branch. */
      bwcVersion = indexCompatVersions[-2]
    } else {
      // The last version is on a release branch so it is handled by this project
      bwcVersion = indexCompatVersions[-1]
    }
  } else {
    throw new InvalidUserDataException("Unsupport project name ${project.name}")
  }
  if (enabled) {
    apply plugin: 'distribution'

    def (String major, String minor, String bugfix) = bwcVersion.split('\\.')
    String bwcBranch =
      project.name == 'stable-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
    }
  }
}