package Hypotheek;

import static Hypotheek.Util.* ;
import org.junit.* ;
import static org.junit.Assert.* ;

public class Hypotheek_test {

    static final float ACCURACY = 0.001f ;

    @Test
    public void test1() {
        int loan = 100 * 100 ;  // 100 euro
        int interestRate = 12 * 100 ; // 12% per annum, so 1% per month
        int duration = 2 * 12 ; // just 2 years
        int monthPayment = 2 * 100 ; // 2 euro
        int age = 1 ;

        Hypotheek H = new Hypotheek() ;
        H.setLoan(loan);
        H.setIterest(interestRate);
        H.setMonthlyPayment(monthPayment) ;
        H.setDuration(duration);
        H.setIncome(age) ;

        // Calculating expectations:

        int remaining = loan ;
        int totalPaidInterest = 0 ;

        for (int t=0; t<duration && remaining>0; t++) {
            int interest = toInt(calcPercentage(toFloat(interestRate)/1200f,remaining)) ;
            int toPay = monthPayment - interest ;
            assertTrue(toPay>=0) ;
            toPay = Math.min(toPay,remaining) ;
            remaining = remaining - toPay ;
            totalPaidInterest += interest ;
            //System.out.println("t = " + t) ;
            //System.out.println("To pay = " + toPay) ;
            //System.out.println("Interest = " + interest) ;
            //System.out.println("Remaining = " + remaining) ;
        }
        int expected_remaining = remaining ;
        int expected_totalPaidInterest = totalPaidInterest ;

        Hypotheek.Result R = H.calculate() ;

        System.out.println(">>> remaining = " +  R.remaining + ", expected = " + expected_remaining) ;
        assertTrue(approxEq(R.remaining,expected_remaining,ACCURACY)) ;
        System.out.println(">>> tot paid interest = " +  R.totInterest + ", expected = " + expected_totalPaidInterest) ;
        assertTrue(approxEq(R.totInterest,expected_totalPaidInterest,ACCURACY)) ;
    }


       @Test
    public void test2() {
        int loan = 100 * 100 ;  // 100 euro
        int interestRate = 12 * 100 ; // 12% per annum, so 1% per month
        int duration = 2 * 12 ; // just 2 years
        int monthPayment = 2 * 100 ; // 2 euro
        int age = 1 ;
        int income = 10000 * 100 ; // 10 Keuro

        Hypotheek H = new Hypotheek() ;
        H.setLoan(loan);
        H.setIterest(interestRate);
        H.setMonthlyPayment(monthPayment) ;
        H.setDuration(duration);
        H.setIncome(age) ;
        H.setIncome(income) ;

        InkomenBelasting taxsys = new InkomenBelasting2009() ;

        // Calculating expectations:

        int remaining = loan ;
        int totalTaxReduction = 0 ;
        int yearlyInterest = 0 ;
        EigenWoningForfait EWforfait = new EigenWoningForfait2007() ;

        for (int t=0; t<duration && remaining>0; t++) {
            int interest = toInt(calcPercentage(toFloat(interestRate)/1200f,remaining)) ;
            int toPay = monthPayment - interest ;
            assertTrue(toPay>=0) ;
            toPay = Math.min(toPay,remaining) ;
            remaining = remaining - toPay ;
            yearlyInterest += interest ;
            if (t % 12 == 11) {
                totalTaxReduction += taxsys.calcHypBelastingAftrek(income + EWforfait.calc(loan), age, yearlyInterest) ;
                yearlyInterest = 0 ;
            }
        }
        int expected_remaining = remaining ;
        int expected_totalTaxReduction = totalTaxReduction ;

        Hypotheek.Result R = H.calculate() ;

        System.out.println(">>> remaining = " +  R.remaining + ", expected = " + expected_remaining) ;
        assertTrue(approxEq(R.remaining,expected_remaining,ACCURACY)) ;
        System.out.println(">>> tot tax reduction = " +  R.totTaxReduction + ", expected = " + expected_totalTaxReduction) ;
        assertTrue(approxEq(R.totTaxReduction,expected_totalTaxReduction,ACCURACY)) ;
    }
}