import sbt._
import xsbt.{ScalaInstance}
import ScalaBuildProject._
import scala.collection.immutable.{EmptyMap}

/**
 * Basic tasks and configuration shared by all layers. This class regroups the configuration and behaviour
 * shared by all layers.
 * @author Grégory Moix
 */
abstract class BasicLayer(val info:ProjectInfo,val versionNumber:String, previousLayer:Option[BasicLayer])
    extends ScalaBuildProject with ReflectiveProject
    with AdditionalResources with LayerCompilation with BuildInfoEnvironment{

  layer =>

  // All path values must be lazy in order to avoid initialization issues (sbt way of doing things)

  def buildInfoEnvironmentLocation:Path=outputRootPath / ("build-"+name+".properties")

  // Support of triggered execution at project level
  override def watchPaths = info.projectPath / "src" ** ("*.scala" || "*.java"|| AdditionalResources.basicFilter)
  override def dependencies = info.dependencies

  lazy val copyright = property[String]
  lazy val partestVersionNumber = property[Version]

  lazy val nextLayer:Option[BasicLayer]=None
  def packingDestination :Path = layerOutput / "pack"
  lazy val libsDestination=packingDestination/"lib"
  lazy val packedStarrOutput=outputRootPath / "pasta"
  lazy val requiredPluginsDirForCompilation = layerOutput / "misc" / "scala-devel" / "plugins"

  def compilerAdditionalJars: List[Path] = Nil
  def libraryAdditionalJars: List[Path] = Nil



  // TASKS

  /**
   * Before compiling the layer, we need to check that the previous layer
   * was created correctly and compile it if necessary
   */
  lazy val startLayer = previousLayer match {
    case Some(previous) => task{
      None
    }.dependsOn(previous.finishLayer)
    case None => task{None}
  }

  def buildLayer:Option[String] = {
    externalCompilation orElse
    writeProperties
  }

  lazy val build= task{
    buildLayer
  }.dependsOn(startLayer)


  /**
   * Finish the compilation and ressources copy and generation
   * It does nothing in itself. As sbt doesn't support conditional dependencies,
   * it permit locker to override it in order to lock the layer when the compilation
   * is finished.
   */
  lazy val finishLayer:ManagedTask = task{None}.dependsOn(build)


  def cleaningList=layerOutput::layerEnvironment.envBackingPath::packingDestination::Nil

  def  cleanFiles = FileUtilities.clean(cleaningList,true,log)

  lazy val clean:Task = nextLayer match {
    case None => super.task{ cleanFiles}// We use super.task, so cleaning is done in every case, even when locked
    case Some(next) => super.task{cleanFiles}.dependsOn{next.clean}

  }

  lazy val cleanBuild = task{
      cleanFiles orElse buildLayer
    }.dependsOn(startLayer)





  // Utility methods (for quick access)
  def libraryOutput = libraryConfig.outputDirectory
  def actorsOutput = actorsConfig.outputDirectory
  def dbcOutput = dbcConfig.outputDirectory
  def swingOutput = swingConfig.outputDirectory
  def scalapOutput = scalapConfig.outputDirectory
  def librarySrcDir = libraryConfig.srcDir
  def compilerOutput = compilerConfig.outputDirectory
  def compilerSrcDir = compilerConfig.srcDir
  def actorsSrcDir = actorsConfig.srcDir
  def swingSrcDir = swingConfig.srcDir
  def outputLibraryJar = libraryWS.packagingConfig.jarDestination
  def outputCompilerJar = compilerConfig.packagingConfig.jarDestination
  def outputPartestJar = partestConfig.packagingConfig.jarDestination
  def outputScalapJar = scalapConfig.packagingConfig.jarDestination

  // CONFIGURATION OF THE COMPILTATION STEPS

 /**
   *  Configuration of the core library compilation
   */
  lazy val libraryConfig = new CompilationStep("library", pathLayout ,log) with ResourcesToCopy with PropertiesToWrite{
    def label = "["+layer.name+"] library"
    def options: Seq[String] = Seq("-sourcepath", pathConfig.sources.absolutePath.toString)
    def dependencies = Nil
    override def classpath = super.classpath +++ forkJoinJar

    def copyDestination = outputDirectory
    def filesToCopy = getResources(srcDir)

    def propertyDestination = outputDirectory / "library.properties"
    def propertyList = ("version.number",versionNumber)::("copyright.string",copyright.value)::Nil
  }

  /**
   * Configuration of the compiler
   */
  lazy val compilerConfig = new CompilationStep("compiler", pathLayout, log) with ResourcesToCopy with PropertiesToWrite with Packaging{
    def label = "["+layer.name+"] compiler"
    private def bootClassPath : String = {
      System.getProperty("sun.boot.class.path")
    }
    override def classpath: PathFinder = super.classpath +++ fjbgJar +++ msilJar +++ jlineJar +++ antJar +++ forkJoinJar
    def options  = Seq("-bootclasspath",bootClassPath)
    def dependencies = if (minimalCompilation) libraryConfig::Nil else libraryConfig::actorsConfig::dbcConfig::swingConfig::Nil

    def copyDestination = outputDirectory
    def filesToCopy = getResources(srcDir)

    def propertyDestination = outputDirectory / "compiler.properties"
    def propertyList = ("version.number",versionNumber)::("copyright.string",copyright.value)::Nil

    lazy val packagingConfig = {
      import java.util.jar.Manifest
      import java.io.FileInputStream
      val manifest = new Manifest(new FileInputStream(manifestPath.asFile))
      new PackagingConfiguration(libsDestination / compilerJarName, List(outputDirectory ##),manifest ,compilerAdditionalJars)
    }
    lazy val starrPackagingConfig = new PackagingConfiguration(packedStarrOutput/compilerJarName, List(outputDirectory ##))

  }

  //// ADDTIONNAL LIBRARIES ////

  /**
   * Config of the actors library
   */
  lazy val actorsConfig = new CompilationStep ("actors", pathLayout,log){
    def label = "["+layer.name+"] actors library"
    override def classpath: PathFinder = super.classpath +++ forkJoinJar
    def options: Seq[String] = Seq()
    def dependencies = libraryConfig::Nil
  }

  /**
   * Config of the dbc library
   */
  lazy val dbcConfig = new CompilationStep("dbc", pathLayout, log) with Packaging{
    def label = "["+layer.name+"] dbc library"
    def options: Seq[String] = Seq()
    def dependencies = libraryConfig::Nil

    lazy val packagingConfig = new PackagingConfiguration(libsDestination / dbcJarName,List(outputDirectory ##))

  }

  /**
   * Config of the swing library
   */
  lazy val swingConfig = new CompilationStep("swing", pathLayout, log) with Packaging{
    def label = "["+layer.name+"] swing library"
    def options: Seq[String] = Seq()
    def dependencies = libraryConfig::actorsConfig::Nil

    lazy val packagingConfig = new PackagingConfiguration(libsDestination / swingJarName,List(outputDirectory ##))


  }

  ///// TOOLS CONFIGURATION ////////

  /**
   *  Configuration of scalacheck
   */
  lazy val scalacheckConfig  = new CompilationStep("scalacheck", pathLayout, log) with Packaging {
    def label = "["+layer.name+"] scalacheck"
    def options: Seq[String] = Seq()
    def dependencies = libraryConfig::compilerConfig::actorsConfig::Nil

    lazy val packagingConfig = new PackagingConfiguration(libsDestination / scalacheckJarName,List(outputDirectory ##))
  }

  /**
   *  Configuration of scalap tool
   */
  lazy val scalapConfig  = new CompilationStep("scalap", pathLayout,log) with Packaging{
    def label = "["+layer.name+"] scalap"
    def options: Seq[String] = Seq()
    def dependencies = libraryConfig::compilerConfig::Nil

    val decoderProperties = (srcDir ## )/ "decoder.properties"

    lazy val packagingConfig = new PackagingConfiguration(libsDestination / scalapJarName,List(outputDirectory ##,decoderProperties))
  }

  /**
   * Configuration of the partest tool
   */
  lazy val partestConfig = new CompilationStep("partest", pathLayout,log) with ResourcesToCopy with PropertiesToWrite with Packaging{
    def label = "["+layer.name+"] partest"
    override def classpath: PathFinder = super.classpath +++ antJar +++ forkJoinJar
    def options: Seq[String] = Seq()
    def dependencies = libraryConfig::compilerConfig::scalapConfig::actorsConfig::Nil

    def copyDestination = outputDirectory
    def filesToCopy = getResources(srcDir)

    def propertyDestination = outputDirectory / "partest.properties"
    def propertyList = ("version.number",partestVersionNumber.value.toString)::("copyright.string",copyright.value)::Nil

    lazy val packagingConfig = new PackagingConfiguration(libsDestination / partestJarName,List(outputDirectory ##))

  }

  ///// PLUGINS CONFIGURATION ////////


  lazy val continuationPluginConfig = new CompilationStep("continuation-plugin",
     new PathConfig{
       def projectRoot:Path = pathLayout.projectRoot
       def sources:Path = pathLayout.srcDir / "continuations" / "plugin"
       def analysis:Path = pathLayout.analysisOutput / "continuations" / "plugin"
       def output:Path = pathLayout.classesOutput / "continuations" / "plugin"
     } ,
     log)with ResourcesToCopy with EarlyPackaging {
    def label = "["+layer.name+"] continuation plugin"
    def dependencies = libraryConfig::compilerConfig::Nil
    override def classpath = super.classpath
    def options = Seq()

    def filesToCopy = (sourceRoots##) / "scalac-plugin.xml"
    def copyDestination = outputDirectory
    def jarContent = List(outputDirectory ##)
    lazy val packagingConfig = new PackagingConfiguration(requiredPluginsDirForCompilation/"continuations.jar",List(outputDirectory ##))
    lazy val earlyPackagingConfig= new PackagingConfiguration(pathLayout.outputDir / "misc" / "scala-devel" / "plugins"/"continuations.jar",List(outputDirectory ##))

  }

  lazy val continuationLibraryConfig = new CompilationStep("continuation-library",
    new PathConfig{
       def projectRoot:Path = pathLayout.projectRoot
       def sources:Path = pathLayout.srcDir / "continuations" / "library"
       def analysis:Path = pathLayout.analysisOutput / "continuations" / "library"
       def output:Path = pathLayout.classesOutput / "continuations" / "library"
     },
     log) {
    def label = "["+layer.name+"] continuation library"
    def dependencies = libraryConfig::compilerConfig::continuationPluginConfig::Nil
    def options = Seq("-Xpluginsdir",requiredPluginsDirForCompilation.absolutePath,"-Xplugin-require:continuations","-P:continuations:enable")

  }




  // Grouping compilation steps
  def minimalCompilation = false // It must be true for locker because we do not need to compile everything

  def libraryWS:WrapperStep with Packaging
  def toolsWS:WrapperStep
  lazy val pluginsWS = new WrapperStep(continuationPluginConfig::continuationLibraryConfig::Nil)

  lazy val allSteps = new WrapperStep(libraryWS::compilerConfig::pluginsWS::toolsWS::Nil)
}