/*
    Name: Program for Alibaba bank account, this is a short CPP program, aiming to build a simple bank system without using class and objects.
    Author: muguangde
    Date:09/22/2014-09:21AM
    Description: This is a small program to simulate bank
    account management. User create an account first, then
    perform other operations.
*/

#include<iostream>
#include<iomanip>
#include<ctype.h>

using namespace std;

int main()
{
    int acctnum=0;
    double balance=0.0;
    void initAccount(int &, double &);
    void print_acct(int,double);
    void calBalance(int,double);
    void menu(int,double);
    void withdrawal(int, double &);
    void deposit(int, double&);
    void delete_acct(int&, double&);

    initAccount(acctnum,balance);//initialize the account
    print_acct(acctnum,balance);//print the account before operation
    menu(acctnum,balance);//operation menu

    return 0;
}

//Function to initialize account
void initAccount(int &acctnum, double &balance)
{
    //prompt the user
    cout<<"Please input the account number:"<<endl;
    cin>>acctnum;
    cout<<"Please input the balance:"<<endl;
    cin>>balance;
}

//Function for M withdraw
void withdrawal(int acctnum, double &balance)
{
    int num=0;
    double amount=0.0;

    cout<<"Please input your account number:"<<endl;
    //Structure input here
    cin>>num;
    while(num!=acctnum) {
        cout<<"Error: account not exist, please re-enter!"<<endl;
        cout<<"Please input your account number:"<<endl;
        cin>>num;
    }

    cout<<"Please input the amount you want to withdraw:"<<endl;
    cin>>amount;
    if(amount>balance)
        cout<<"Error: insufficient fund."<<endl;
    else
        balance=balance-amount;
}

//Function to deposit funds
void deposit(int acctnum, double &balance)
{
    int num=0;
    double amount=0.0;

    cout<<"Please input your account number:"<<endl;
    //Structure input here
    cin>>num;
    while(num!=acctnum) {
        cout<<"Error: account not exist, please re-enter!"<<endl;
        cout<<"Please input your account number:"<<endl;
        cin>>num;
    }

    cout<<"Please input the amount you want to deposit:"<<endl;
    cin>>amount;
    if(amount<=0)
        cout<<"Error: you should add money."<<endl;
    else
        balance=balance+amount;
}

//Function to delete account
void delete_acct(int &acctnum, double &balance)
{
    int num=0;

    cout<<"Please input your account number you want to delete:"<<endl;
    //Structure input here
    cin>>num;
    while(num!=acctnum) {
        cout<<"Error: account not exist, please re-enter!"<<endl;
        cout<<"Please input your account number:"<<endl;
        cin>>num;
    }
    //set account # and balance to zero to delete account
    balance=0.0;
    acctnum=0;
}
//Function to print the balance
void calBalance(int acctnum,double balance)
{
    int num;
    cout<<"Please input your account number:"<<endl;
    cin>>num;
    //If account number=0, it means account deleted
    if (acctnum==num) {
        cout<<"\n*********Bank of Alibaba: balance sheet*****<<******"<<endl;
        cout<<"*********All information of the account*******"<<endl;
        cout<<"Account number: "<<acctnum<<endl;
        cout<<"Account balance: "<<setiosflags(ios::fixed)
            <<setprecision(2)<<balance<<endl;
        cout<<"**************************************************"<<endl;
    } else
        cout<<"\n*********Account deleted or not exist!***********"<<endl;
}


//Function to print acct info
void print_acct(int acctnum,double balance)
{
    //If account number=0, it means account deleted
    if (acctnum>0) {
        cout<<"\n*********Bank of Alibaba: balance sheet***********"<<endl;
        cout<<"*********All information of the account*******"<<endl;
        cout<<"Account number: "<<acctnum<<endl;
        cout<<"Account balance: "<<setiosflags(ios::fixed)
            <<setprecision(2)<<balance<<endl;
        cout<<"**************************************************"<<endl;
    } else
        cout<<"\n*********Account deleted or not exist!***********"<<endl;
}

//Function for the menu
void menu(int acctnum,double balance)
{
    char input;
    cout<<"\n*********Account operation**********************"<<endl;
    cout<<"Please select your operation:"<<endl;
    cout<<"W-Withdrawal"<<endl;
    cout<<"D-Deposit"<<endl;
    cout<<"B-Balance"<<endl;
    cout<<"Q-Quit"<<endl;
    cout<<"X-Delete Account"<<endl;
    cin>>input;
    //In case people input lower case letter
    //if(input=='w'||input='d'||input=='b'||input=='q'||input=='x')
    input=toupper(input);

    while(input!='W' && input!='D' && input!='B'&& input!='Q'
            && input!='X') {
        cout<<"\nError: please re-enter:"<<endl;
        cout<<"\n*********Account operation**********************"<<endl;
        cout<<"Please select your operation:"<<endl;
        cout<<"W-Withdrawal"<<endl;
        cout<<"D-Deposit"<<endl;
        cout<<"B-Balance"<<endl;
        cout<<"Q-Quit"<<endl;
        cout<<"X-Delete Account"<<endl;
        cin>>input;
        input=toupper(input);
    }

    while(input!='Q') { //If not quit, continue with operation
        switch(input) {
        case 'W':
            withdrawal(acctnum,balance);
            break;
        case 'D':
            deposit(acctnum,balance);
            break;
        case 'B':
            calBalance(acctnum,balance);
            break;
        case 'X':
            delete_acct(acctnum,balance);
            break;
        case 'Q':
            print_acct(acctnum,balance);
            break;
        default:
            ;
        }
        cout<<"\n*********Account operation**********************"<<endl;
        cout<<"Please select your operation:"<<endl;
        cout<<"W-Withdrawal"<<endl;
        cout<<"D-Deposit"<<endl;
        cout<<"B-Balance"<<endl;
        cout<<"Q-Quit"<<endl;
        cout<<"X-Delete Account"<<endl;
        cin>>input;
        input=toupper(input);
        while(input!='W' && input!='D' && input!='B'&& input!='Q'
                && input!='X') {
            cout<<"\nError: please re-enter:"<<endl;
            cout<<"\n*********Account operation**********************"<<endl;
            cout<<"Please select your operation:"<<endl;
            cout<<"W-Withdrawal"<<endl;
            cout<<"D-Deposit"<<endl;
            cout<<"B-Balance"<<endl;
            cout<<"Q-Quit"<<endl;
            cout<<"X-Delete Account"<<endl;
            cin>>input;
            input=toupper(input);
        }
    }
    //out of the loop,means=='Q',print and done.
    print_acct(acctnum,balance);
}