package cbt

import java.io._
import java.net._

class BasicBuild(final val context: Context) extends BaseBuild
trait BaseBuild extends BuildInterface with DependencyImplementation with TriggerLoop with SbtDependencyDsl{
  //* DO NOT OVERRIDE CONTEXT in non-idempotent ways, because .copy and new Build
  // will create new instances given the context, which means operations in the
  // overrides will happen multiple times and if they are not idempotent stuff likely breaks
  def context: Context
  def moduleKey: String = "BaseBuild("+target.string+")"
  implicit def transientCache: java.util.Map[AnyRef,AnyRef] = context.transientCache

  // library available to builds
  implicit protected final val logger: Logger = context.logger
  implicit protected final val classLoaderCache: ClassLoaderCache = context.classLoaderCache
  implicit protected final val _context = context
  override protected final val lib: Lib = new Lib(logger)

  // ========== general stuff ==========

  def enableConcurrency = false
  def projectDirectory: File = lib.realpath(context.workingDirectory)
  assert( projectDirectory.exists, "projectDirectory does not exist: " ++ projectDirectory.string )
  assert(
    projectDirectory.getName =!= "build" ||
    {
      def transitiveInterfaces(cls: Class[_]): Vector[Class[_]] = cls.getInterfaces.toVector.flatMap(i => i +: transitiveInterfaces(i))
      transitiveInterfaces(this.getClass).contains(classOf[BuildBuildWithoutEssentials])
    },
    "You need to extend BuildBuild in: " + projectDirectory + "/build"
  )

  final def usage: String = lib.usage(this.getClass, show)

  final def taskNames: String = lib.taskNames(this.getClass).sorted.mkString("\n")

  // ========== meta data ==========

  def defaultScalaVersion: String = constants.scalaVersion
  final def scalaVersion = context.scalaVersion getOrElse defaultScalaVersion
  final def scalaMajorVersion: String = lib.libMajorVersion(scalaVersion)
  def projectName = "default"

  // TODO: get rid of this in favor of newBuild.
  // currently blocked on DynamicOverride being not parts
  // of core but being part of plugin essentials while
  // callNullary in lib needing .copy .
  def copy(context: Context): BuildInterface =
    this.getClass
      .getConstructor(classOf[Context])
      .newInstance(context)
      .asInstanceOf[BuildInterface]

  def zincVersion = constants.zincVersion

  def dependencies: Seq[Dependency] =
    // FIXME: this should probably be removed
    Resolver( mavenCentral ).bind(
      "org.scala-lang" % "scala-library" % scalaVersion
    ) ++ ( if(localJars.nonEmpty) Seq( BinaryDependency(localJars, Nil) ) else Nil )

  // ========== paths ==========
  final private val defaultSourceDirectory = projectDirectory ++ "/src"

  /** base directory where stuff should be generated */
  def target: File = projectDirectory ++ "/target"
  /** base directory where stuff should be generated for this scala version*/
  def scalaTarget: File = target ++ s"/scala-$scalaMajorVersion"
  /** directory where jars (and the pom file) should be put */
  def jarTarget: File = scalaTarget
  /** directory where the scaladoc should be put */
  def docTarget: File = scalaTarget ++ "/api"
  /** directory where the class files should be put (in package directories) */
  def compileTarget: File = scalaTarget ++ "/classes"
  /**
  File which cbt uses to determine if it needs to trigger an incremental re-compile.
  Last modified date is the time when the last successful compilation started.
  Contents is the cbt version git hash.
  */
  def compileStatusFile: File = compileTarget ++ ".last-success"

  /** Source directories and files. Defaults to .scala and .java files in src/ and top-level. */
  def sources: Seq[File] = Seq(defaultSourceDirectory) ++ projectDirectory.listFiles.toVector.filter(sourceFileFilter)

  /** Which file endings to consider being source files. */
  def sourceFileFilter(file: File): Boolean = file.toString.endsWith(".scala") || file.toString.endsWith(".java")

  /** Absolute path names for all individual files found in sources directly or contained in directories. */
  final def sourceFiles: Seq[File] = lib.sourceFiles(sources, sourceFileFilter)

  protected def logEmptySourceDirectories(): Unit = {
    val nonExisting =
      sources
        .filterNot( _.exists )
        .diff( Seq(defaultSourceDirectory) )
    if(!nonExisting.isEmpty) logger.stage2("Some sources do not exist: \n"++nonExisting.mkString("\n"))
  }
  logEmptySourceDirectories()

  def Resolver( urls: URL* ) = MavenResolver( context.cbtLastModified, context.paths.mavenCache, urls: _* )

  def ScalaDependency(
    groupId: String, artifactId: String, version: String, classifier: Classifier = Classifier.none,
    scalaVersion: String = scalaMajorVersion
  ) = lib.ScalaDependency( groupId, artifactId, version, classifier, scalaVersion )

  final def DirectoryDependency(path: File) = cbt.DirectoryDependency(
    context.copy( workingDirectory = path, args = Seq() )
  )

  def triggerLoopFiles: Seq[File] = sources ++ transitiveDependencies.collect{ case b: TriggerLoop => b.triggerLoopFiles }.flatten

  def localJars           : Seq[File] =
    Seq(projectDirectory ++ "/lib")
      .filter(_.exists)
      .flatMap(_.listFiles)
      .filter(_.toString.endsWith(".jar"))

  override def dependencyClasspath : ClassPath = super.dependencyClasspath

  protected def compileDependencies: Seq[Dependency] = dependencies
  final def compileClasspath : ClassPath = Dependencies(compileDependencies).classpath

  def resourceClasspath: ClassPath = {
    val resourcesDirectory = projectDirectory ++ "/resources"
    ClassPath(Seq(resourcesDirectory).filter(_.exists))
  }
  def exportedClasspath: ClassPath = {
    compile
    ClassPath(Seq(compileTarget).filter(_.exists)) ++ resourceClasspath
  }
  def targetClasspath = ClassPath(Seq(compileTarget))
  // ========== compile, run, test ==========

  /** scalac options used for zinc and scaladoc */
  def scalacOptions: Seq[String] = Seq(
    "-feature",
    "-deprecation",
    "-unchecked"
  )

  final def lastModified: Long = compile.getOrElse(0L)

  def compile: Option[Long] = taskCache[BaseBuild]("_compile").memoize{
    lib.compile(
      context.cbtLastModified,
      sourceFiles, compileTarget, compileStatusFile, compileDependencies,
      context.paths.mavenCache, scalacOptions,
      zincVersion = zincVersion, scalaVersion = scalaVersion
    )
  }

  def clean: ExitCode = {
    lib.clean(
      target,
      context.args.contains("force"),
      context.args.contains("dry-run"),
      context.args.contains("list"),
      context.args.contains("help")
    )
  }

  def repl: ExitCode = {
    lib.consoleOrFail("Use `cbt direct repl` instead")

    val colorized = "scala.color"
    if(Option(System.getProperty(colorized)).isEmpty) {
      // set colorized REPL, if user didn't pass own value
      System.setProperty(colorized, "true")
    }

    val scalac = new ScalaCompilerDependency(context.cbtLastModified, context.paths.mavenCache, scalaVersion)
    runMain(
      "scala.tools.nsc.MainGenericRunner",
      Seq(
        "-bootclasspath",
        scalac.classpath.string,
        "-classpath",
        classpath.string
      ) ++ context.args : _*
    )
  }

  def run: ExitCode = run( context.args: _* )

  def test: Any =
    Some(new lib.ReflectBuild(
      DirectoryDependency(projectDirectory++"/test").build
    ).callNullary(Some("run")))

  def t = test
  def rt = recursiveUnsafe(Some("test"))

  def recursiveSafe(_run: BuildInterface => Any): ExitCode = {
    val builds = (this +: transitiveDependencies).collect{
      case b: BuildInterface => b
    }
    val results = builds.map(_run)
    if(
      results.forall{
        case Some(_:ExitCode) => true
        case None => true
        case _:ExitCode => true
        case other => false
      }
    ){
      if(
        results.collect{
          case Some(c:ExitCode) => c
          case c:ExitCode => c
        }.filter(_ != 0)
         .nonEmpty
      ) ExitCode.Failure
      else ExitCode.Success
    } else ExitCode.Success
  }

  def recursive: ExitCode = {
    recursiveUnsafe(context.args.lift(1))
  }

  def recursiveUnsafe(taskName: Option[String]): ExitCode = {
    recursiveSafe{
      b =>
      System.err.println(b.show)
      lib.trapExitCode{ // FIXME: trapExitCode does not seem to work here
        try{
          new lib.ReflectBuild(b).callNullary(taskName)
          ExitCode.Success
        } catch {
          case e: Throwable => println(e.getClass); throw e
        }
      }
      ExitCode.Success
    }
  }

  def c = compile
  def r = run

  /*
  context.logger.composition(">"*80)
  context.logger.composition("class   " ++ this.getClass.toString)
  context.logger.composition("dir     " ++ projectDirectory.string)
  context.logger.composition("sources " ++ sources.toList.mkString(" "))
  context.logger.composition("target  " ++ target.string)
  context.logger.composition("context " ++ context.toString)
  context.logger.composition("dependencyTree\n" ++ dependencyTree)
  context.logger.composition("<"*80)
  */

  // ========== cbt internals ==========
  def finalBuild: BuildInterface = this
  override def show = this.getClass.getSimpleName ++ "(" ++ projectDirectory.string ++ ")"

  // a method that can be called only to trigger any side-effects
  final def `void` = ()

  @deprecated("use the MultipleScalaVersions plugin instead","")
  final def crossScalaVersionsArray = Array(scalaVersion)
}