package uk.ac.leeds.sog.moses.agent;

import java.util.Random;

import org.apache.log4j.Logger;

/**
 * @author Belinda
 * This class provides a method for application of probability rates of 
 * formal care/death statue to people by age group. 
 */
public class ProbabilityByAgeGroup {
	//minimum age and maximum age within the age group
	int i_minAge,i_maxAge;
	int i_formalCareProbability, i_deathProbability;
	
	Random i_generator;
	// a random sequence of number used to apply the probability
	int[] i_formalCareRandomSeq = new int[100];
	// a pointer to find the postion of an age corresponding to the random sequence
	int i_formalCarePosition;
	//a random sequence of number used to apply the probability
	int[] i_deathRandomSeq = new int[100];
	//	 a pointer to find the postion of an age corresponding to the random sequence
	int i_deathPosition;
	
	private static Logger s_logger = Logger.getLogger(ProbabilityByAgeGroup.class);
	//constructor
	ProbabilityByAgeGroup(int a_minAge, int a_maxAge, int a_formalCareProbability, int a_deathProbability) {
		i_minAge = a_minAge;
		i_maxAge = a_maxAge;
		i_formalCareProbability = a_formalCareProbability;
		i_deathProbability = a_deathProbability;
		i_generator = new Random();
		
		//call the methods to create random sequence required for application 
		//of the formal care and death probability
		createFormalCareRandomSeq();
		createDeathRandomSeq();
	}
	//method to create formal care random sequence
	private void createFormalCareRandomSeq() {
		for(int i=0; i<=99; i++) {
			i_formalCareRandomSeq[i] = i_generator.nextInt(100) + 1;    // random int value is between 1 and 100
		}
		i_formalCarePosition = 0;
	}
	
	//	method to create formal care random sequence	
	private void createDeathRandomSeq() {
		for(int i=0; i<=99; i++) {
			i_deathRandomSeq[i] = i_generator.nextInt(100) + 1;    // random int value is between 1 and 100
		}
		i_deathPosition = 0;
	}
	
	public int getMinAge() {
		return i_minAge;
	}
	
	public int getMaxAge() {
		return i_maxAge;
	}
	//method to find out whether there has been a health change 
	//and the person has been put in formal care and output the results
	public boolean formalcare() {
		boolean result = false;
		
		if(i_formalCarePosition >= 100) {
			createFormalCareRandomSeq();
		}
		
		if(i_formalCareRandomSeq[i_formalCarePosition] <= i_formalCareProbability) {
			result = true;
		}
		//move the pointer forward for the next age in the list
		i_formalCarePosition++;

		if(s_logger.isDebugEnabled()) {
			s_logger.debug("i_formalCarePosition: " + i_formalCarePosition);
			StringBuffer buffer = new StringBuffer();
			for(int i=0; i<=99; i++) {
				buffer.append(i_formalCareRandomSeq[i] + " ");
			}
			s_logger.debug("i_formalCareRandomSeq: " + buffer.toString());
		}

		return result;
	}
	//method to find out if the person is dead and output the results
	public boolean death() {
		boolean result = false;
		
		if(i_deathPosition >= 100) {
			createDeathRandomSeq();
		}
		
		if(i_deathRandomSeq[i_deathPosition] <= i_deathProbability) {
			result = true;
		}
		
		i_deathPosition++;

		if(s_logger.isDebugEnabled()) {
			s_logger.debug("i_deathPosition: " + i_deathPosition);
			StringBuffer buffer = new StringBuffer();
			for(int i=0; i<=99; i++) {
				buffer.append(i_deathRandomSeq[i] + " ");
			}
			s_logger.debug("i_deathRandomSeq: " + buffer.toString());
		}
		
		return result;
	}

}