#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include "functions.h"// allows functions.h to access functions.c
//Below all constants are defined and set
#define annual_fee 9250
#define placement_fee 1850
#define placement_maintance 2350
#define maintance_loan 8700
#define RPI 0.033
#define interest_rate 0.03
#define MIN_salary 20000
#define MAX_salary 50000
#define increment 5000
#define sal_cut_off 25000
#define ANN_sal_inc 0.03
#define pay_back_percentage 0.09
#define max_months 360


int grad_year, total_loan, counted_months;// integer values being used
double loan_inc_interest, loan_balance[360], monthly_rep[360],monthly_int[360], monthly_int_rte[360], starting_sal, final_sal[360], con_income[360], salary; // float values being used

void graduation_date(int courselength, int placement, int MM, int YYYY) {
    //the graduation date of the use is calculated dependant on if they are undertaking a placement year
    if (placement == 'Y' || placement == 'y') {
        YYYY++;
        grad_year = YYYY + courselength;
        printf("Your graduation date is 06/%d", grad_year);
        //if the user is undertaking a placement year, the year they entered is being increased by due to this and added to courselength
    }
    else if (placement == 'N' || placement == 'n') {
        grad_year = YYYY + courselength;
        printf("Your graduation date is 06/%d", grad_year);
        //if the user is not undertaking a placement year the year they entered will be added to their courselength
    }
}

void payment_date() {
    //calculating first payment date
    grad_year++;
    printf("\nYour first payment year will be in 04/%d", grad_year);
    //adds one year to the grad year
}

void valueof_loan(char placement, int courselength) {
    //value of the users loan as they leave university is being calculated
    if (placement == 'y' || placement == 'Y') {
        //will run if the user is undertaking a placement year
        total_loan = (courselength*annual_fee) + placement_fee + placement_maintance + (courselength*maintance_loan);
        printf("\nThe total value of your loan without interest is %d", total_loan);//total loan before interest

        for (int year = 0; year < 2; year++) {//This is for the two years before the placement year
            loan_inc_interest = (loan_inc_interest + (annual_fee + maintance_loan))*(1 + RPI + interest_rate);//Loan counter will take the previous years loan with interest and add maintance loan and tution fees on, and multiply by 1.063(RPI+interest rate)
            printf("\nThe value of your loan including interest after %d year is %f\n", year + 1, loan_inc_interest);//outputs loan including interst after the year, until two years
        }

        //assume the placement year is after the second year
        loan_inc_interest = (loan_inc_interest + (placement_fee + placement_maintance))*(1 + RPI + interest_rate);//during placement year, miantance loan and tution fee are replaced with placement maintance and
        printf("\nThe value of your loan including interest after undertaking a placement year is %f", loan_inc_interest);

        for (int year = 2; year < courselength; year++) {
            loan_inc_interest = (loan_inc_interest + (annual_fee + maintance_loan))*(1 + RPI + interest_rate);
            printf("\nThe value of your loan including interest after %d year is %f\n", year + 1, loan_inc_interest);
        }

    }
    else if (placement == 'n' || placement == 'N') {
        for (int n = 0; n <= courselength; n++) {
            loan_inc_interest = (loan_inc_interest + (annual_fee + maintance_loan))*(1 + RPI + interest_rate);
            printf("\n%f\n", loan_inc_interest);
        }

    }
}
void Salary_calculation() {
    salary = MIN_salary;
    FILE *csv;
    csv = fopen("loancalc.csv", "w");


    FILE *txt;
    txt = fopen("loancalc.txt", "w");
    fclose(txt);
    for (MIN_salary; salary <= MAX_salary; salary = salary + increment) {
        double new_salary[361];//makes first value of array equal to salary
        new_salary[0] = salary;//
        counted_months = 0;

        while (counted_months < max_months) {
            counted_months++;
            printf("%d", counted_months);
            if (counted_months % 12 == 0) {
                new_salary[counted_months] = new_salary[(counted_months)-1] + (new_salary[(counted_months)-1] * (RPI + ANN_sal_inc));
            }
            else {
                new_salary[counted_months] = new_salary[(counted_months)-1];

            }

        }
        fprintf(csv, "SALARY: ,");
        for (int counter = 0; counter <= counted_months; counter++) {
            fprintf(csv, "%f,", new_salary[counter]);
        }
        fprintf(csv, "\n");





        FILE *txt;
        txt = fopen("loancalc.txt", "a");
        fprintf(txt, "\nfinal salary: %f", new_salary[counted_months]);
        fclose(txt);
    }


}