package sbt.compiler

	import sbt.CompileSetup
	import sbt.inc.{Analysis, IncOptions}
	import xsbti.{Logger, Maybe}
	import xsbti.compile._

	import java.io.File

object IC extends IncrementalCompiler[Analysis, AnalyzingCompiler]
{
	def compile(in: Inputs[Analysis, AnalyzingCompiler], log: Logger): Analysis =
	{
		val setup = in.setup; import setup._
		val options = in.options; import options.{options => scalacOptions, _}
		val compilers = in.compilers; import compilers._
		val agg = new AggressiveCompile(setup.cacheFile)
		val aMap = (f: File) => m2o(analysisMap(f))
		val defClass = (f: File) => { val dc = definesClass(f); (name: String) => dc.apply(name) }
		val incOptions = IncOptions.fromStringMap(incrementalCompilerOptions)
		agg(scalac, javac, sources, classpath, output, cache, m2o(progress), scalacOptions, javacOptions, aMap,
		    defClass, reporter, order, skip, incOptions)(log)
	}

	private[this] def m2o[S](opt: Maybe[S]): Option[S] = if(opt.isEmpty) None else Some(opt.get)

	def newScalaCompiler(instance: ScalaInstance, interfaceJar: File, options: ClasspathOptions, log: Logger): AnalyzingCompiler =
		new AnalyzingCompiler(instance, CompilerInterfaceProvider.constant(interfaceJar), options, log)

	def compileInterfaceJar(label: String, sourceJar: File, targetJar: File, interfaceJar: File, instance: ScalaInstance, log: Logger)
	{
		val raw = new RawCompiler(instance, sbt.ClasspathOptions.auto, log)
		AnalyzingCompiler.compileSources(sourceJar :: Nil, targetJar, interfaceJar :: Nil, label, raw, log)
	}

	def readCache(file: File): Maybe[(Analysis, CompileSetup)] =
		try { Maybe.just(readCacheUncaught(file)) } catch { case _: Exception => Maybe.nothing() }

	def readAnalysis(file: File): Analysis =
		try { readCacheUncaught(file)._1 } catch { case _: Exception => Analysis.Empty }

	def readCacheUncaught(file: File): (Analysis, CompileSetup) =
	{
		import sbinary.DefaultProtocol.{immutableMapFormat, immutableSetFormat, StringFormat, tuple2Format}
		import sbt.inc.AnalysisFormats._
		sbt.IO.gzipFileIn(file)( in => sbinary.Operations.read[(Analysis, CompileSetup)](in) )
	}
}