package com.googlecode.transmutant



import java.util.HashSet

import org.apache.log4j.BasicConfigurator 

import org.apache.log4j.Level 

import org.apache.log4j.LogManager 



public class StepValidator implements Steppable { {

		BasicConfigurator.configure()

		LogManager.rootLogger.level = Level.INFO

	}

	

	def log = LogManager.getLogger(StepValidator.class);

	

	void step(def steps) {

		steps.each {step->

			

			def orderSet = [] as Set

			def orderList = []

			def outSet = [] as Set

			def outList = []

			

			step.class.methods.each {m->

				if (m.isAnnotationPresent(Step.class)){

					def order = m.getAnnotation(Step.class).order()

					orderSet.add(order)

					orderList.add(order)

				}

				if (m.isAnnotationPresent(Out.class)){

					def name = m.getAnnotation(Out.class).name()

					outSet.add(name)

					outList.add(name)

				}

			}

			

			checkForDuplicateAnnotations(step, outSet, outList)

			

			if (orderList.size() != 1 && orderSet.size() < orderList.size()){

				throw new IllegalStateException("@Step methods should have unique order values")

			}

		}

	}

	

	private checkForDuplicateAnnotations(step, outSet, outList) {

		def inSet = [] as Set

		def inList = []

		

		step.class.declaredFields.each {f->

			if (f.isAnnotationPresent(In.class)){

				def name = f.getAnnotation(In.class).name()

				inSet.add(name)

				inList.add(name)

			}

			if (f.isAnnotationPresent(Out.class)){

				def name = f.getAnnotation(Out.class).name()

				outSet.add(name)

				outList.add(name)

			}

		}

		

		if(inSet.size() < inList.size()) {

			log.warn("duplicate @In names found")

		}

		if(outSet.size() < outList.size()) {

			log.warn("duplicate @Out names found")

		}

	}

}