#include<stdio.h>

/* Function Declarations */
char getUserType();
int getKwPerHour();
float getPriceCharge(char, int);
void displayAnalysis(int, float, int, float);
char getVerification();
/*********************/

void main() {
    char verification;
    char userType;
    int kwPerHour;
    float priceCharge;

    //local variables increments add for finalisation
    int privateCustomers = 0;
    float privateCustomersCost = 0.0;
    int commercialCustomers = 0;
    float commercialCustomersCost = 0.0;

    while (verification != 'N') {
        userType = getUserType();
        kwPerHour = getKwPerHour();
        priceCharge = getPriceCharge(userType, kwPerHour);

        if (userType == 'P') {
            privateCustomers++;
            privateCustomersCost += priceCharge;
        } else if (userType == 'C') {
            commercialCustomers++;
            commercialCustomersCost += priceCharge;
        }

        verification = getVerification();
        getchar();
    }
    displayAnalysis(privateCustomers, privateCustomersCost, commercialCustomers, commercialCustomersCost);
}

char getUserType() {
    char userType;
    printf("\nEnter user type (P/C): P = Private, C = Commercial : \n");
    scanf("%c", &userType);
    return userType;
}

int getKwPerHour() {
    int kwPerHour;
    printf ("Enter kilowatts used per hour:\n");
    scanf ("%d", &kwPerHour);
    return kwPerHour;
}

float getPriceCharge(char userType, int kwPerHour) {
    float excessCharge = 0.0;
    float chargeMultiplier;
    float priceCharge;

    if (userType == 'P') {
        chargeMultiplier = 0.68;

        if (kwPerHour > 1000) {
            excessCharge = -((kwPerHour - 1000)  * 0.68) * 0.005;
        }

    } else if (userType == 'C') {
        chargeMultiplier = 0.74;

        if (kwPerHour > 100000) {
            excessCharge = ((kwPerHour - 100000)  * 0.74) * 0.01;
        }

    }

    priceCharge = ((kwPerHour * chargeMultiplier) + excessCharge) + 50.0;
    printf ("\nCharge = $%.2f \n ", priceCharge);

    return priceCharge;
}

char getVerification() {
    char verif;

    printf("\nWould you like to continue? Y = yes, N = no\n");
    getchar();
    scanf("%c", &verif);

    while(verif != 'N' && verif != 'Y') {
       printf("%c is not a valid entry, please re-enter your choice.\n", verif);
       getchar();
       scanf("%c", &verif);
    }

    return verif;
}

void displayAnalysis(int pAmt, float pCost, int cAmt, float cCost) {

    printf ("\n Private users = %d \n ", pAmt);
    printf ("Total amount received from private users = $%.2f \n ", pCost);
    printf ("Average amount received from private users = $%.2f \n ", pCost / pAmt);

    printf ("\n Commercial users = %d \n ", cAmt);
    printf ("Total amount received from commercial users = $%.2f \n ", cCost);
    printf ("Average amount received from commercial users = $%.2f \n ", cCost / cAmt);

    printf ("\n\nExiting program...\n");
}