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'
    // Not published so no need to assemble
    tasks.remove(assemble)
    build.dependsOn.remove('assemble')

    def (String major, String minor, String bugfix) = bwcVersion.split('\\.')
    def (String currentMajor, String currentMinor, String currentBugfix) = version.split('\\.')
    String bwcBranch
    if (project.name == 'stable-snapshot' && major != currentMajor) {
      bwcBranch = "${major}.x"
    } else {
      bwcBranch = "${major}.${minor}"
    }

    File esCheckoutDir = file("${buildDir}/bwc/checkout-es-${bwcBranch}")
    File xpackCheckoutDir = file("${esCheckoutDir}-extra/x-pack-elasticsearch")

    final String remote = System.getProperty("tests.bwc.remote", "elastic")

    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 findElasticsearchRemote(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.esRemoteExists = false
        output.toString('UTF-8').eachLine {
          if (it.contains("${remote}\tgit@github.com:${remote}/elasticsearch.git")) {
            project.ext.esRemoteExists = true
          }
        }
      }
    }

    task findXPackRemote(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.xpackRemoteExists = false
        output.toString('UTF-8').eachLine {
          if (it.contains("${remote}\tgit@github.com:${remote}/x-pack-elasticsearch.git")) {
            project.ext.xpackRemoteExists = true
          }
        }
      }
    }

    task addElasticsearchRemote(type: LoggedExec) {
      dependsOn findElasticsearchRemote
      onlyIf { project.ext.esRemoteExists == false }
      workingDir = esCheckoutDir
      commandLine = ['git', 'remote', 'add', "${remote}", "git@github.com:${remote}/elasticsearch.git"]
    }

    task addXPackRemote(type: LoggedExec) {
      dependsOn findXPackRemote
      onlyIf { project.ext.xpackRemoteExists == false }
      workingDir = xpackCheckoutDir
      commandLine = ['git', 'remote', 'add', "${remote}", "git@github.com:${remote}/x-pack-elasticsearch.git"]
    }

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

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

    String esBuildMetadataKey = "bwc_refspec_${project.path.substring(1)}_elasticsearch"
    task checkoutElasticsearchBwcBranch(type: LoggedExec) {
      dependsOn fetchElasticsearchLatest
      def String refspec = System.getProperty("tests.bwc.refspec", buildMetadata.get(esBuildMetadataKey, "${remote}/${bwcBranch}"))
      workingDir = esCheckoutDir
      commandLine = ['git', 'checkout', refspec]
    }

    String xpackBuildMetadataKey = "bwc_refspec_${project.path.substring(1)}_xpack"
    task checkoutXPackBwcBranch(type: LoggedExec) {
      dependsOn fetchXPackLatest
      def String refspec = System.getProperty("tests.bwc.refspec", buildMetadata.get(xpackBuildMetadataKey, "${remote}/${bwcBranch}"))
      workingDir = xpackCheckoutDir
      commandLine = ['git', 'checkout', refspec]
    }

    File esBuildMetadataFile = project.file("build/${project.name}_elasticsearch/build_metadata")
    task writeElasticsearchBuildMetadata(type: LoggedExec) {
      dependsOn checkoutElasticsearchBwcBranch
      workingDir = esCheckoutDir
      commandLine = ['git', 'rev-parse', 'HEAD']
      ignoreExitValue = true
      ByteArrayOutputStream output = new ByteArrayOutputStream()
      standardOutput = output
      doLast {
        if (execResult.exitValue != 0) {
          output.toString('UTF-8').eachLine { line -> logger.error(line) }
          execResult.assertNormalExitValue()
        }
        project.mkdir(esBuildMetadataFile.parent)
        esBuildMetadataFile.setText("${esBuildMetadataKey}=${output.toString('UTF-8')}", 'UTF-8')
      }
    }

    File xpackBuildMetadataFile = project.file("build/${project.name}_xpack/build_metadata")
    task writeXPackBuildMetadata(type: LoggedExec) {
      dependsOn checkoutXPackBwcBranch
      workingDir = xpackCheckoutDir
      commandLine = ['git', 'rev-parse', 'HEAD']
      ignoreExitValue = true
      ByteArrayOutputStream output = new ByteArrayOutputStream()
      standardOutput = output
      doLast {
        if (execResult.exitValue != 0) {
          output.toString('UTF-8').eachLine { line -> logger.error(line) }
          execResult.assertNormalExitValue()
        }
        project.mkdir(xpackBuildMetadataFile.parent)
        xpackBuildMetadataFile.setText("${xpackBuildMetadataKey}=${output.toString('UTF-8')}", 'UTF-8')
      }
    }

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

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