/**
 *
 *
 * Copyright (c) Wishnu Prasetya, 2009.
 */
package Hypotheek;

import static Hypotheek.Util.* ;

/**
 *
 * @author Wishnu Prasetya
 */
public abstract class InkomenBelasting {
	
	int schijf1_max ;
	int schijf2_max ;
	int schijf3_max ;
	
	float  schijf1_taxrate ;
	float  schijf2_taxrate ;
	float  schijf3_taxrate ;
	float  schijf4_taxrate ;

    

	/**
	 * Calculate the income tax. The income is given in euro-cent, the tax
	 * is also expressed in euro-cent.
	 */
	public int calcInkomenBelasting(int income, int age) {
		
		assert income >=0 : "PRE" ;
		assert age >= 0 : "PRE" ;

        int zgvz = calcBijdrageZorgverzekering(income,age) ;
        int arbeidkorting = calcArbeidskorting(income,age) ;
		income += zgvz ;
		//System.out.println("###" + zgvz) ;
        
		int schijf1 = 0 ;
		int schijf2 = 0 ;
		int schijf3 = 0 ;
		int schijf4 = 0 ;
		schijf1 = Math.min(income, schijf1_max) ;
		schijf2 = Math.min(Math.max(income - schijf1_max,0), schijf2_max - schijf1_max) ;
		schijf3 = Math.min(Math.max(income - schijf2_max,0), schijf3_max - schijf2_max) ;
		schijf4 = Math.max(income - schijf3_max,0) ;

        //System.out.println(">>> S1 = " + schijf1) ;
        //System.out.println(">>> S2 = " + schijf2) ;
        //System.out.println(">>> S3 = " + schijf3) ;
        //System.out.println(">>> S4 = " + schijf4) ;

		assert schijf1 >= 0 ;
		assert schijf2 >= 0 ;
		assert schijf3 >= 0 ;
		assert schijf4 >= 0 ;
		
		
		int tax = toInt(calcPercentage(schijf1_taxrate,schijf1) 
					+ calcPercentage(schijf2_taxrate,schijf2)
					+ calcPercentage(schijf3_taxrate,schijf3)
					+ calcPercentage(schijf4_taxrate,schijf4)) ;

        tax = Math.max(0,tax - arbeidkorting) ;

		assert tax >=0 ;
		
		return tax ;
	}
	
	abstract public int caclPremieVolksverzekeringen(int income, int age)  ;

	abstract public int calcBijdrageZorgverzekering(int income, int age) ;

    public int calcTotInkomenBelasting(int income, int age) {
        int b = calcInkomenBelasting(income,age)
                + caclPremieVolksverzekeringen(income,age)
                + calcBijdrageZorgverzekering(income,age) ;
        return b ;
    }


	/**
	 * Calculate the tax reduction one would receive for the amount he pays
	 * for hypotheek interest. This depends of course on the person's income.
	 * 
	 * @income Annual bruto income in euro-cent.
	 * @paidForInterest The amount one pays for hypotheek interest for a year.
     * Also expressed in euro-cent.
	 */
	public int calcHypBelastingAftrek(int income, int age, int paidForInterest) {
		
		assert income>=0 : "PRE" ;
		assert age>=0 : "PRE" ;
		assert paidForInterest>=0 : "PRE" ;
		
		int taxPayedNow = calcTotInkomenBelasting(income,age) ;
		
		int taxableIncome = Math.max(0, income - paidForInterest) ;
		
		int reduction = taxPayedNow - calcTotInkomenBelasting(taxableIncome,age) ;
		
		assert reduction >= 0 ;
		assert reduction <= taxPayedNow ;
		
		return reduction ;
	}

    abstract public int calcArbeidskorting(int income, int age) ;

}