#include "atmFunctions.h"

#include <iomanip>
#include <iostream>
#include <limits>

/**
 * @brief Normalizes dollar & cent amounts by converting any 100 cent chunks to
 * dollars
 *
 * @param pDollars A pointer to the amount of dollars
 * @param pCents A pointer to the amount of cents
 */
void normalize_dollars(int* pDollars, int* pCents) {
  *pDollars += *pCents / 100;
  *pCents = *pCents % 100;
}

void start_atm() {
  int dollars = 0;
  int cents = 0;

  std::cout << "You have entered the ATM menu" << std::endl;

  bool continuing = true;
  char choice;
  do {
    print_menu();
    choice = get_user_selection();
    switch (choice) {
      case '1':
        print_balance(&dollars, &cents);
        break;
      case '2':
        deposit_money(&dollars, &cents);
        break;
      case '3':
        withdraw_money(&dollars, &cents);
        break;
      case 'Q':
        continuing = false;
        std::cout << "Have a nice day!" << std::endl;
        break;
    }
  } while (continuing);
}

void print_menu() {
  std::cout << "Please make a selection:" << std::endl
            << "(1) Print Current Balance" << std::endl
            << "(2) Deposit" << std::endl
            << "(3) Withdraw" << std::endl
            << "(Q) Quit" << std::endl;
}

char get_user_selection() {
  char input = 'Q';

  while (true) {
    std::cout << "Choice: ";
    std::cin >> input;
    std::cin.clear();
    std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
    if (std::cin.fail() ||
        !(input == '1' || input == '2' || input == '3' || input == 'Q')) {
      std::cout << "Invalid choice, please try again" << std::endl;
    } else {
      std::cout << std::endl;
      return input;
    }
  };
}

void print_balance(int* pDollars, int* pCents) {
  std::cout << "Your account currently contains a total of $" << *pDollars
            << "." << std::setfill('0') << std::setw(2) << *pCents << "."
            << std::endl
            << std::endl;
}

void deposit_money(int* pDollars, int* pCents) {
  // Prompt the user for the amount to deposit
  int dollarsToDeposit = 0, centsToDeposit = 0;
  std::cout << "How many dollars would you like to deposit? ";
  std::cin >> dollarsToDeposit;
  std::cout << "How many cents would you like to deposit? ";
  std::cin >> centsToDeposit;

  // Ensure valid positive integers were entered
  if (dollarsToDeposit < 0 || centsToDeposit < 0) {
    std::cout << "Deposits must be positive amounts, please try again with "
                 "proper values"
              << std::endl
              << std::endl;
    return;
  }

  // Normalize the user-inputted values for later display
  normalize_dollars(&dollarsToDeposit, &centsToDeposit);

  *pDollars += dollarsToDeposit;
  *pCents += centsToDeposit;

  // Normalize the true account values after addition
  normalize_dollars(pDollars, pCents);

  // Display the amount deposited nicely
  std::cout << "You have successfully deposited a total of $"
            << dollarsToDeposit << "." << std::setfill('0') << std::setw(2)
            << centsToDeposit << "." << std::endl
            << std::endl;
}

void withdraw_money(int* pDollars, int* pCents) {
  // Prompt the user for the amount to withdraw
  int dollarsToWithdraw = 0, centsToWithdraw = 0;
  std::cout << "How many dollars would you like to withdraw? ";
  std::cin >> dollarsToWithdraw;
  std::cout << "How many cents would you like to withdraw? ";
  std::cin >> centsToWithdraw;

  if (centsToWithdraw < 0 || dollarsToWithdraw < 0) {
    std::cout << "Withdrawals must be positive amounts, please try again with "
                 "proper values"
              << std::endl
              << std::endl;
    return;
  }

  normalize_dollars(&dollarsToWithdraw, &centsToWithdraw);

  // Convert dollar amounts to cents for easier subtraction
  int totalCentWithdrawal = dollarsToWithdraw + (dollarsToWithdraw * 100);

  *pCents += *pDollars * 100;
  *pDollars = 0;

  if (totalCentWithdrawal > *pCents) {
    std::cout << "You do not have enough money for this withdrawal" << std::endl
              << std::endl;
    return;
  }

  *pCents -= totalCentWithdrawal;

  normalize_dollars(pDollars, pCents);

  std::cout << "You have successfully withdrawn a total of $"
            << dollarsToWithdraw << "." << std::setfill('0') << std::setw(2)
            << centsToWithdraw << "." << std::endl
            << std::endl;
}