/*
 * Serial_loan.java
 *
 * Created on 17 August 2007
 *
 * The serial loan class.
 */

package loan;

/**
 *
 * @author merethe
 */
public class Serial_loan extends Payment{
    double[] payments; //Array of amount to pay each month
    
    /** Creates a new instance of Serial_loan */
    public Serial_loan(){
    }
    
    /**
     * Calculate the payment
     * @param years Number of years
     * @param money Amount of money
     * @param interest Interest per year
     */
    public String calculate(int years, int money, double interest){
        String calculation = "";
        
        double each_month;
        each_month = money / (years * 12);
        
        double interest_pr_month;
        interest_pr_month = interest/12;
        
        payments = new double[(years * 12) + 1];
        
        double calc_interest = 0; //interest pr month
        double calc_sum = 0; //to pay each month
        double sum = money;
        
        //Calculate money plus interest for all the months
        for(int i = 1; i <= years*12; i++){
           calc_interest = (sum * interest_pr_month) / 100;
           calc_sum = each_month + calc_interest;
           payments[i] = calc_sum;
           sum = sum - each_month;
        }
        
        calculation = show_calculation(years);
        
        return calculation;
    }
    
    /**
     * Calculate the payment and return it as a String
     * @param years Number of years
     */
    public String show_calculation(int years){
        String calculation = "";
        int month = 1;
        
        for(int i = 1; i <= years*12; i++){
            if((i-1) % 12 == 0){ //Each year
                int year = ((i / 12) + 1);
                calculation = calculation + "\n\nYear " + year;
                month = 1;
            }
            
            calculation = calculation + "\nMonth " + month + ":\t" + payments[i];
            month++;
        }
        return calculation;
    }
    
}