/*
 * 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 org.apache.tools.ant.taskdefs.condition.Os
import org.apache.tools.ant.filters.FixCrLfFilter
import org.elasticsearch.gradle.BuildPlugin
import org.elasticsearch.gradle.EmptyDirTask
import org.elasticsearch.gradle.LoggedExec
import org.elasticsearch.gradle.MavenFilteringHack
import org.elasticsearch.gradle.VersionProperties
import org.elasticsearch.gradle.plugin.PluginBuildPlugin

import java.nio.file.Files
import java.nio.file.Path

// need this so Zip/Tar tasks get basic defaults...
apply plugin: 'base'

// CopySpec does not make it easy to create an empty directory so we
// create the directory that we want, and then point CopySpec to its
// parent to copy to the root of the distribution
ext.logsDir = new File(buildDir, 'logs-hack/logs')
task createLogsDir(type: EmptyDirTask) {
  dir "${logsDir}"
  dirMode 0755
}
ext.pluginsDir= new File(buildDir, 'plugins-hack/plugins')
task createPluginsDir(type: EmptyDirTask) {
  dir "${pluginsDir}"
  dirMode 0755
}

CopySpec archiveFiles(CopySpec modulesFiles, String distributionType, boolean oss) {
  return copySpec {
    into("elasticsearch-${version}") {
      with libFiles
      into('config') {
        dirMode 0750
        fileMode 0660
        with configFiles(distributionType, oss)
      }
      into('bin') {
        with binFiles(distributionType, oss)
        with copySpec {
          from('../src/bin') {
            include '*.bat'
            filter(FixCrLfFilter, eol: FixCrLfFilter.CrLf.newInstance('crlf'))
          }
          MavenFilteringHack.filter(it, expansionsForDistribution(distributionType, oss))
        }
      }
      into('') {
        from {
          dirMode 0755
          logsDir.getParent()
        }
      }
      into('') {
        from {
          dirMode 0755
          pluginsDir.getParent()
        }
      }
      from(rootProject.projectDir) {
        include 'README.textile'
      }
      from(rootProject.file('licenses')) {
        include oss ? 'APACHE-LICENSE-2.0.txt' : 'ELASTIC-LICENSE.txt'
        rename { 'LICENSE.txt' }
      }

      with noticeFile
      from('../src') {
        include 'bin/*.exe'
      }
      into('modules') {
        with modulesFiles
      }
    }
  }
}

// common config across all zip/tar
tasks.withType(AbstractArchiveTask) {
  dependsOn createLogsDir, createPluginsDir
  String subdir = it.name.substring('build'.size()).replaceAll(/[A-Z]/) { '-' + it.toLowerCase() }.substring(1)
  destinationDir = file("${subdir}/build/distributions")
  baseName = "elasticsearch${ subdir.contains('oss') ? '-oss' : ''}"
}

task buildIntegTestZip(type: Zip) {
  with archiveFiles(transportModulesFiles, 'zip', false)
}

task buildZip(type: Zip) {
  with archiveFiles(modulesFiles(false), 'zip', false)
}

task buildOssZip(type: Zip) {
  with archiveFiles(modulesFiles(true), 'zip', true)
}

Closure commonTarConfig = {
  extension = 'tar.gz'
  compression = Compression.GZIP
  dirMode 0755
  fileMode 0644
}

task buildTar(type: Tar) {
  configure(commonTarConfig)
  with archiveFiles(modulesFiles(false), 'tar', false)
}

task buildOssTar(type: Tar) {
  configure(commonTarConfig)
  with archiveFiles(modulesFiles(true), 'tar', true)
}

Closure tarExists = { it -> new File('/bin/tar').exists() || new File('/usr/bin/tar').exists() || new File('/usr/local/bin/tar').exists() }
Closure unzipExists = { it -> new File('/bin/unzip').exists() || new File('/usr/bin/unzip').exists() || new File('/usr/local/bin/unzip').exists() }

// This configures the default artifact for the distribution specific
// subprojects. We have subprojects for two reasons:
// 1. Gradle project substitutions can only bind to the default
//    configuration of a project
// 2. The integ-test-zip and zip distributions have the exact same
//    filename, so they must be placed in different directories.
subprojects {
  apply plugin: 'distribution'

  String buildTask = "build${it.name.replaceAll(/-[a-z]/) { it.substring(1).toUpperCase() }.capitalize()}"
  ext.buildDist = parent.tasks.getByName(buildTask)
  artifacts {
    'default' buildDist
  }

  // sanity checks if archives can be extracted
  final File archiveExtractionDir
  if (project.name.contains('tar')) {
    archiveExtractionDir = new File(buildDir, 'tar-extracted')
  } else {
    assert project.name.contains('zip')
    archiveExtractionDir = new File(buildDir, 'zip-extracted')
  }
  task checkExtraction(type: LoggedExec) {
    dependsOn buildDist
    doFirst {
      project.delete(archiveExtractionDir)
      archiveExtractionDir.mkdirs()
    }
  }
  check.dependsOn checkExtraction
  if (project.name.contains('tar')) {
    checkExtraction {
      onlyIf tarExists
      commandLine 'tar', '-xvzf', "${-> buildDist.outputs.files.singleFile}", '-C', archiveExtractionDir
    }
  } else {
    assert project.name.contains('zip')
    checkExtraction {
      onlyIf unzipExists
      commandLine 'unzip', "${-> buildDist.outputs.files.singleFile}", '-d', archiveExtractionDir
    }
  }

  final Closure toolExists
  if (project.name.contains('tar')) {
    toolExists = tarExists
  } else {
    assert project.name.contains('zip')
    toolExists = unzipExists
  }


  task checkLicense {
    dependsOn buildDist, checkExtraction
    onlyIf toolExists
    doLast {
      final String licenseFilename
      if (project.name.contains('oss-')) {
        licenseFilename = "APACHE-LICENSE-2.0.txt"
      } else {
        licenseFilename = "ELASTIC-LICENSE.txt"
      }
      final List<String> licenseLines = Files.readAllLines(rootDir.toPath().resolve("licenses/" + licenseFilename))
      final Path licensePath = archiveExtractionDir.toPath().resolve("elasticsearch-${VersionProperties.elasticsearch}/LICENSE.txt")
      assertLinesInFile(licensePath, licenseLines)
    }
  }
  check.dependsOn checkLicense

  task checkNotice {
    dependsOn buildDist, checkExtraction
    onlyIf toolExists
    doLast {
      final List<String> noticeLines = Arrays.asList("Elasticsearch", "Copyright 2009-2018 Elasticsearch")
      final Path noticePath = archiveExtractionDir.toPath().resolve("elasticsearch-${VersionProperties.elasticsearch}/NOTICE.txt")
      assertLinesInFile(noticePath, noticeLines)
    }
  }
  check.dependsOn checkNotice

  if (project.name == 'zip' || project.name == 'tar') {
    task checkMlCppNotice {
      dependsOn buildDist, checkExtraction
      onlyIf toolExists
      doLast {
        // this is just a small sample from the C++ notices, the idea being that if we've added these lines we've probably added all the required lines
        final List<String> expectedLines = Arrays.asList("Apache log4cxx", "Boost Software License - Version 1.0 - August 17th, 2003")
        final Path noticePath = archiveExtractionDir.toPath().resolve("elasticsearch-${VersionProperties.elasticsearch}/modules/x-pack/x-pack-ml/NOTICE.txt")
        final List<String> actualLines = Files.readAllLines(noticePath)
        for (final String expectedLine : expectedLines) {
          if (actualLines.contains(expectedLine) == false) {
            throw new GradleException("expected [${noticePath}] to contain [${expectedLine}] but it did not")
          }
        }
      }
    }
    check.dependsOn checkMlCppNotice
  }
}

/*****************************************************************************
 *                            Rest test config                               *
 *****************************************************************************/
configure(subprojects.findAll { it.name == 'integ-test-zip' }) {
  apply plugin: 'elasticsearch.standalone-rest-test'
  apply plugin: 'elasticsearch.rest-test'

  integTest {
    includePackaged = true
  }

  integTestCluster {
    dependsOn assemble
    distribution = project.name
  }
  integTestRunner {
    if (Os.isFamily(Os.FAMILY_WINDOWS) && System.getProperty('tests.timeoutSuite') == null) {
      // override the suite timeout to 30 mins for windows, because it has the most inefficient filesystem known to man
      systemProperty 'tests.timeoutSuite', '1800000!'
    }
  }

  processTestResources {
    inputs.properties(project(':distribution').restTestExpansions)
    MavenFilteringHack.filter(it, project(':distribution').restTestExpansions)
  }
}

/*****************************************************************************
 *                              Maven config                                 *
 *****************************************************************************/
configure(subprojects.findAll { it.name.contains('zip') }) {
  // only zip distributions go to maven
  BuildPlugin.configurePomGeneration(project)
  apply plugin: 'nebula.info-scm'
  apply plugin: 'nebula.maven-base-publish'
  apply plugin: 'nebula.maven-scm'

  // note: the group must be correct before applying the nexus plugin, or
  // it will capture the wrong value...
  String subgroup = project.name == 'integ-test-zip' ? 'integ-test-zip' : 'zip'
  project.group = "org.elasticsearch.distribution.${subgroup}"

  // make the pom file name use elasticsearch instead of the project name
  archivesBaseName = "elasticsearch${it.name.contains('oss') ? '-oss' : ''}"

  publishing {
    publications {
      nebula {
        artifactId archivesBaseName
        artifact buildDist
      }
      /*
       * HUGE HACK: the underlying maven publication library refuses to
       * deploy any attached artifacts when the packaging type is set to
       * 'pom'. But Sonatype's OSS repositories require source files for
       * artifacts that are of type 'zip'. We already publish the source
       * and javadoc for Elasticsearch under the various other subprojects.
       * So here we create another publication using the same name that
       * has the "real" pom, and rely on the fact that gradle will execute
       * the publish tasks in alphabetical order. This lets us publish the
       * zip file and even though the pom says the type is 'pom' instead of
       * 'zip'. We cannot setup a dependency between the tasks because the
       * publishing tasks are created *extremely* late in the configuration
       * phase, so that we cannot get ahold of the actual task. Furthermore,
       * this entire hack only exists so we can make publishing to maven
       * local work, since we publish to maven central externally.
       */
      nebulaRealPom(MavenPublication) {
        artifactId archivesBaseName
        pom.packaging = 'pom'
        pom.withXml { XmlProvider xml ->
          Node root = xml.asNode()
          root.appendNode('name', 'Elasticsearch')
          root.appendNode('description', 'A Distributed RESTful Search Engine')
          root.appendNode('url', PluginBuildPlugin.urlFromOrigin(project.scminfo.origin))
          Node scmNode = root.appendNode('scm')
          scmNode.appendNode('url', project.scminfo.origin)
        }
      }
    }
  }
}