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

import xsbti.api.Source
import java.io.File

trait Analysis
{
	val stamps: Stamps
	val apis: APIs
	val relations: Relations
	
	def ++(other: Analysis): Analysis
	def -- (sources: Iterable[File]): Analysis
	def copy(stamps: Stamps = stamps, apis: APIs = apis, relations: Relations = relations): Analysis
	
	def addSource(src: File, api: Source, stamp: Stamp, internalDeps: Iterable[File]): Analysis
	def addBinaryDep(src: File, dep: File, className: String, stamp: Stamp): Analysis
	def addExternalDep(src: File, dep: String, api: Source): Analysis
	def addProduct(src: File, product: File, stamp: Stamp): Analysis 
}

object Analysis
{
	lazy val Empty: Analysis = new MAnalysis(Stamps.empty, APIs.empty, Relations.empty)
}
private class MAnalysis(val stamps: Stamps, val apis: APIs, val relations: Relations) extends Analysis
{
	def ++ (o: Analysis): Analysis = new MAnalysis(stamps ++ o.stamps, apis ++ o.apis, relations ++ o.relations)
	def -- (sources: Iterable[File]): Analysis =
	{
		val newRelations = relations -- sources
		def keep[T](f: (Relations, T) => Set[_]): T => Boolean = file => !f(newRelations, file).isEmpty
		
		val newAPIs = apis.removeInternal(sources).filterExt( keep(_ usesExternal _) )
		val newStamps = stamps.filter( keep(_ produced _), sources, keep(_ usesBinary _))
		new MAnalysis(newStamps, newAPIs, newRelations)
	}
	def copy(stamps: Stamps, apis: APIs, relations: Relations): Analysis = new MAnalysis(stamps, apis, relations)

	def addSource(src: File, api: Source, stamp: Stamp, internalDeps: Iterable[File]): Analysis =
		copy( stamps.markInternalSource(src, stamp), apis.markInternalSource(src, api), relations.addInternalSrcDeps(src, internalDeps) )

	def addBinaryDep(src: File, dep: File, className: String, stamp: Stamp): Analysis =
		copy( stamps.markBinary(dep, className, stamp), apis, relations.addBinaryDep(src, dep) )

	def addExternalDep(src: File, dep: String, depAPI: Source): Analysis =
		copy( stamps, apis.markExternalAPI(dep, depAPI), relations.addExternalDep(src, dep) )

	def addProduct(src: File, product: File, stamp: Stamp): Analysis =
		copy( stamps.markProduct(product, stamp), apis, relations.addProduct(src, product) )
}