package sbt.compiler

	import java.io.File
	import sbt.{CompileSetup, IO, Using}
	import sbt.inc.{Analysis, IncOptions, TextAnalysisFormat}
	import xsbti.{Logger, Maybe}
	import xsbti.compile._


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() }

	@deprecated("Use overloaded variant which takes `IncOptions` as parameter.", "0.13.2")
	def readAnalysis(file: File): Analysis =
		try { readCacheUncaught(file)._1 } catch { case _: Exception => Analysis.Empty }

	def readAnalysis(file: File, incOptions: IncOptions): Analysis =
		try { readCacheUncaught(file)._1 } catch {
			case _: Exception => Analysis.empty(nameHashing = incOptions.nameHashing)
		}

	def readCacheUncaught(file: File): (Analysis, CompileSetup) =
		Using.fileReader(IO.utf8)(file) { reader =>
			try {
				TextAnalysisFormat.read(reader)
			} catch {
				case ex: sbt.inc.ReadException =>
					throw new java.io.IOException(s"Error while reading $file", ex)
			}
		}
}