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

	import xsbti.{Logger => _,_}
	import xsbti.compile.{CompileOrder,GlobalsCache}
	import CompileOrder.{JavaThenScala, Mixed, ScalaThenJava}
	import compiler._
	import inc._
	import Locate.DefinesClass
	import java.io.File

object Compiler
{
	val DefaultMaxErrors = 100

	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, sourcePositionMapper: Position => Position, order: CompileOrder)
	final case class IncSetup(analysisMap: File => Option[Analysis], definesClass: DefinesClass, skip: Boolean, cacheFile: File, cache: GlobalsCache, incOptions: IncOptions)
	final case class Compilers(scalac: AnalyzingCompiler, javac: JavaTool)

	def inputs(classpath: Seq[File], sources: Seq[File], classesDirectory: File, options: Seq[String], javacOptions: Seq[String], maxErrors: Int, sourcePositionMappers: Seq[Position => Option[Position]], order: CompileOrder)(implicit compilers: Compilers, incSetup: IncSetup, log: Logger): Inputs =
		new Inputs(
			compilers,
			new Options(classpath, sources, classesDirectory, options, javacOptions, maxErrors, foldMappers(sourcePositionMappers), 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 = AggressiveCompile.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: JavaTool)(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)
		val provider = ComponentCompiler.interfaceProvider(componentManager)
		new AnalyzingCompiler(instance, provider, cpOptions, log)
	}

	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, CompileOutput(classesDirectory), cache, None, options, javacOptions,
		    analysisMap, definesClass, new LoggerReporter(maxErrors, log, sourcePositionMapper), order, skip, incOptions)(log)
	}

	private[sbt] def foldMappers[A](mappers: Seq[A => Option[A]]) =
		mappers.foldRight({p: A => p}) { (mapper, mappers) => {p: A => mapper(p).getOrElse(mappers(p))}}
}