/* sbt -- Simple Build Tool
 * Copyright 2010  Mark Harrah
 */
package sbt

	import xsbti.{Logger => _,_}
	import compiler._
	import inc._
	import Locate.DefinesClass
	import java.io.File

object Compiler
{
	val DefaultMaxErrors = 100

	def allProblems(inc: Incomplete): Seq[Problem] =
		allProblems(inc :: Nil)
	def allProblems(incs: Seq[Incomplete]): Seq[Problem] =
		problems(Incomplete.allExceptions(incs).toSeq)
	def problems(es: Seq[Throwable]): Seq[Problem]  =
		es flatMap {
			case cf: xsbti.CompileFailed => cf.problems
			case _ => Nil
		}

	final case class Inputs(compilers: Compilers, config: Options, incSetup: IncSetup)
	final case class Options(classpath: Seq[File], sources: Seq[File], classesDirectory: File, options: Seq[String], javacOptions: Seq[String], maxErrors: Int, order: CompileOrder.Value)
	final case class IncSetup(analysisMap: Map[File, Analysis], definesClass: DefinesClass, skip: Boolean, cacheFile: File)
	final case class Compilers(scalac: AnalyzingCompiler, javac: JavaCompiler)

	@deprecated("Use the other inputs variant.", "0.12.0")
	def inputs(classpath: Seq[File], sources: Seq[File], outputDirectory: File, options: Seq[String], javacOptions: Seq[String], definesClass: DefinesClass, maxErrors: Int, order: CompileOrder.Value)(implicit compilers: Compilers, log: Logger): Inputs =
	{
		import Path._
		val classesDirectory = outputDirectory / "classes"
		val cacheFile = outputDirectory / "cache_old_style"
		val augClasspath = classesDirectory.asFile +: classpath
		val incSetup = IncSetup(Map.empty, definesClass, false, cacheFile)
		inputs(augClasspath, sources, classesDirectory, options, javacOptions, maxErrors, order)(compilers, incSetup, log)
	}
	def inputs(classpath: Seq[File], sources: Seq[File], classesDirectory: File, options: Seq[String], javacOptions: Seq[String], maxErrors: Int, order: CompileOrder.Value)(implicit compilers: Compilers, incSetup: IncSetup, log: Logger): Inputs =
		new Inputs(
			compilers,
			new Options(classpath, sources, classesDirectory, options, javacOptions, maxErrors, order),
			incSetup
		)

	def compilers(cpOptions: ClasspathOptions)(implicit app: AppConfiguration, log: Logger): Compilers =
	{
		val scalaProvider = app.provider.scalaProvider
		compilers(ScalaInstance(scalaProvider.version, scalaProvider.launcher), cpOptions)
	}

	def compilers(instance: ScalaInstance, cpOptions: ClasspathOptions)(implicit app: AppConfiguration, log: Logger): Compilers =
		compilers(instance, cpOptions, None)

	def compilers(instance: ScalaInstance, cpOptions: ClasspathOptions, javaHome: Option[File])(implicit app: AppConfiguration, log: Logger): Compilers =
	{
		val javac = directOrFork(instance, cpOptions, javaHome)
		compilers(instance, cpOptions, javac)
	}
	def compilers(instance: ScalaInstance, cpOptions: ClasspathOptions, javac: JavaCompiler.Fork)(implicit app: AppConfiguration, log: Logger): Compilers =
	{
		val javaCompiler = JavaCompiler.fork(cpOptions, instance)(javac)
		compilers(instance, cpOptions, javaCompiler)
	}
	def compilers(instance: ScalaInstance, cpOptions: ClasspathOptions, javac: JavaCompiler)(implicit app: AppConfiguration, log: Logger): Compilers =
	{
		val scalac = scalaCompiler(instance, cpOptions)
		new Compilers(scalac, javac)
	}
	def scalaCompiler(instance: ScalaInstance, cpOptions: ClasspathOptions)(implicit app: AppConfiguration, log: Logger): AnalyzingCompiler =
	{
		val launcher = app.provider.scalaProvider.launcher
		val componentManager = new ComponentManager(launcher.globalLock, app.provider.components, Option(launcher.ivyHome), log)
		new AnalyzingCompiler(instance, componentManager, cpOptions, log)
	}
	def directOrFork(instance: ScalaInstance, cpOptions: ClasspathOptions, javaHome: Option[File]): JavaCompiler =
		if(javaHome.isDefined)
			JavaCompiler.fork(cpOptions, instance)(forkJavac(javaHome))
		else
			JavaCompiler.directOrFork(cpOptions, instance)(forkJavac(None))

	def forkJavac(javaHome: Option[File]): JavaCompiler.Fork =
	{
		import Path._
		def exec(jc: JavacContract) = javaHome match { case None => jc.name; case Some(jh) => (jh / "bin" / jc.name).absolutePath }
		(contract: JavacContract, args: Seq[String], log: Logger) => {
			log.debug("Forking " + contract.name + ": " + exec(contract) + " " + args.mkString(" "))
			val javacLogger = new JavacLogger(log)
			var exitCode = -1
			try {
				exitCode = Process(exec(contract), args) ! javacLogger
			} finally {
				javacLogger.flush(exitCode)
			}
			exitCode
		}
	}

	def apply(in: Inputs, log: Logger): Analysis =
	{
			import in.compilers._
			import in.config._
			import in.incSetup._

		val agg = new AggressiveCompile(cacheFile)
		agg(scalac, javac, sources, classpath, classesDirectory, options, javacOptions, analysisMap, definesClass, maxErrors, order, skip)(log)
	}
}

private[sbt] class JavacLogger(log: Logger) extends ProcessLogger {
  import scala.collection.mutable.ListBuffer
  import Level.{Info, Warn, Error, Value => LogLevel}

  private val msgs: ListBuffer[(LogLevel, String)] = new ListBuffer()

  def info(s: => String): Unit =
    synchronized { msgs += ((Info, s)) }

  def error(s: => String): Unit =
    synchronized { msgs += ((Error, s)) }

  def buffer[T](f: => T): T = f

  private def print(desiredLevel: LogLevel)(t: (LogLevel, String)) = t match {
    case (Info, msg) => log.info(msg)
    case (Error, msg) => log.log(desiredLevel, msg)
  }

  def flush(exitCode: Int): Unit = {
    val level = if (exitCode == 0) Warn else Error
    msgs foreach print(level)
    msgs.clear()
  }
}