#include <iostream>
#include <iomanip>

#define NAMELENGTH 20
using std::cout;
using std::endl;
using std::setprecision;
using std::fixed;

void initAccount(char acctName[], double& acctBalance) {
    strcpy(acctName,"Anonymous");
    acctBalance = 0;
}

void initAccount(char acctName[], double& acctBalance, 
                 char name[], double initBalance) {
    strcpy(acctName,name);
    acctBalance = initBalance;
}

void initTransaction(char& type, double& amount) {
    type = 'D';
    amount = 0;
}

void initTransaction(char& type, double& amount,
                     char t, double a) {
    type = t;
    amount = a;    
}

void processTransaction(char type, double amount,
                        char acctName[], double& acctBalance) {
    if (type == 'C') {
        acctBalance -= amount;
    } else if (type == 'D') {
        acctBalance += amount;
    }
}

void undoTransaction(char type, double amount,
                     char acctName[], double& acctBalance) {
    processTransaction(type,-amount,acctName, acctBalance);
}

int checkTransaction(char type, double amount,
                     char acctName[], double acctBalance) {
    return type == 'D' ||
           type == 'C' && amount <= acctBalance;
}

void displayAccount(char acctName[], double acctBalance) {
    cout << "Customer: " << acctName 
         << " Balance: $" << fixed << setprecision(2) 
         << acctBalance << endl;
}

void displayTransaction(char type, double amount) {
    cout << "$" << fixed << setprecision(2) 
         << amount << " " << (type == 'C' ? "Check" : "Deposit")
         << endl;
}


int main() {

    char cust1Name[NAMELENGTH];
    double cust1balance;

    char trans1Type;
    double trans1Amount;

    char trans2Type;
    double trans2Amount;

    char trans3Type;
    double trans3Amount;


    initAccount(cust1Name,cust1balance, "Smith", 100.00);
    displayAccount(cust1Name,cust1balance);


    initTransaction(trans1Type,trans1Amount,'D',400.00);
    processTransaction(trans1Type,trans1Amount,
                       cust1Name,cust1balance);

    cout << "After ";
    displayTransaction(trans1Type,trans1Amount);
    displayAccount(cust1Name,cust1balance);

    initTransaction(trans2Type,trans2Amount,'C',1000.00);
    initTransaction(trans3Type,trans3Amount,'C',50.00);

    cout << endl;
    cout << "Thinking about this transaction ... " << endl;
    displayTransaction(trans2Type,trans2Amount);

    if (checkTransaction(trans2Type,trans2Amount,cust1Name,cust1balance)) {
        cout << "This transaction is OK" << endl; 
        processTransaction(trans2Type,trans2Amount,
                           cust1Name,cust1balance);
    } else {
        cout << "This transaction is not OK" << endl; 
    }

    cout << endl;
    cout << "Thinking about this transaction ... " << endl;
    displayTransaction(trans3Type,trans3Amount);
    if (checkTransaction(trans3Type,trans3Amount,cust1Name,cust1balance)) {
        cout << "This transaction is OK" << endl; 
        processTransaction(trans3Type,trans3Amount,
                           cust1Name,cust1balance);
    } else {
        cout << "This transaction is not OK" << endl; 
    }

    cout << endl;
    cout << "After the transaction" << endl;
    displayAccount(cust1Name,cust1balance);

    cout << "Undoing following transaction:" << endl;
    displayTransaction(trans3Type,trans3Amount);
    undoTransaction(trans3Type,trans3Amount,cust1Name,cust1balance);

    cout << endl;
    cout << "After undoing" << endl;
    displayAccount(cust1Name,cust1balance);


    return 0;

}