// Add a top-level pseudo-task to which we will attach individual regenerate tasks.

configure(rootProject) {
  configurations {
    jflex
  }

  dependencies {
    jflex "de.jflex:jflex:${scriptDepVersions['jflex']}"
  }

  task jflex() {
    description "Regenerate sources for corresponding jflex grammar files."
    group "generation"

    dependsOn ":lucene:core:jflexStandardTokenizerImpl"
    dependsOn ":lucene:analysis:common:jflexUAX29URLEmailTokenizerImpl"
  }
}

// We always regenerate, no need to declare outputs.
class JFlexTask extends DefaultTask {
  @Input
  File jflexFile

  @Input
  File skeleton

  @Optional
  String heapSize

  JFlexTask() {
    dependsOn(project.rootProject.configurations.jflex)
  }

  @TaskAction
  def generate() {
    if (!jflexFile || !jflexFile.exists()) {
      throw new RuntimeException("JFlex file does not exist: ${jflexFile}")
    }
    def targetDir = jflexFile.parentFile
    def target = jflexFile.absolutePath.replace(".jflex", ".java")

    logger.lifecycle("Regenerating JFlex:\n  from: ${jflexFile}\n    to: ${target}")
    project.javaexec {
      classpath {
        project.rootProject.configurations.jflex
      }
      main = "jflex.Main"
      args += [
          "-nobak",
          "--quiet",
          "--encoding", "UTF-8",
      ]

      if (heapSize) {
        maxHeapSize = heapSize
      }

      if (skeleton) {
        args += ["--skel", skeleton.absolutePath]
      }

      args += [
        "-d", targetDir.absolutePath,
        jflexFile
      ]
    }

    // Correct line endings for Windows.
    project.ant.fixcrlf(
        file: target,
        encoding: "UTF-8",
        eol: "lf"
    )
  }
}

configure(project(":lucene:core")) {
  task jflexStandardTokenizerImpl(type: JFlexTask) {
    description "Regenerate StandardTokenizerImpl.java"
    group "generation"

    jflexFile = file('src/java/org/apache/lucene/analysis/standard/StandardTokenizerImpl.jflex')
    skeleton = file("src/data/jflex/skeleton.disable.buffer.expansion.txt")

    doLast {
      ant.replace(
          file: file('src/java/org/apache/lucene/analysis/standard/StandardTokenizerImpl.java'),
          encoding: "UTF-8",
          token: "private static final int ZZ_BUFFERSIZE =",
          value: "private int ZZ_BUFFERSIZE ="
      )
    }
  }
}

configure(project(":lucene:analysis:common")) {
  task jflexUAX29URLEmailTokenizerImpl(type: JFlexTask) {
    description "Regenerate UAX29URLEmailTokenizerImpl.java"
    group "generation"

    jflexFile = file('src/java/org/apache/lucene/analysis/standard/UAX29URLEmailTokenizerImpl.jflex')
    skeleton = project(":lucene:core").file("src/data/jflex/skeleton.disable.buffer.expansion.txt")
    heapSize = "12g"

    doFirst {
      logger.lifecycle("Regenerating UAX29URLEmailTokenizerImpl. This may take a long time (and requires tons of memory).")
    }

    doLast {
      ant.replace(
          file: file('src/java/org/apache/lucene/analysis/standard/UAX29URLEmailTokenizerImpl.java'),
          encoding: "UTF-8",
          token: "private static final int ZZ_BUFFERSIZE =",
          value: "private int ZZ_BUFFERSIZE ="
      )
    }
  }
}