Wallet.cpp

#include "Wallet.h"

#include <iostream>

#include "CSVReader.h"

Wallet::Wallet() {
}

void Wallet::insertCurrency(std::string type, double amount) {
  double balance;
  if (amount < 0) {
    throw std::exception{};
  }
  if (currencies.count(type) == 0)  // not there yet
  {
    balance = 0;
  } else {  // is there
    balance = currencies[type];
  }
  balance += amount;
  currencies[type] = balance;
}

bool Wallet::removeCurrency(std::string type, double amount) {
  if (amount < 0) {
    return false;
  }
  if (currencies.count(type) == 0)  // not there yet
  {
    // std::cout << "No currency for " << type << std::endl;
    return false;
  } else {                               // is there - do  we have enough
    if (containsCurrency(type, amount))  // we have enough
    {
      // std::cout << "Removing " << type << ": " << amount << std::endl;
      currencies[type] -= amount;
      return true;
    } else  // they have it but not enough.
      return false;
  }
}

bool Wallet::containsCurrency(std::string type, double amount) {
  if (currencies.count(type) == 0)  // not there yet
    return false;
  else
    return currencies[type] >= amount;
}

std::string Wallet::toString() {
  std::string s;
  for (std::pair<std::string, double> pair : currencies) {
    std::string currency = pair.first;
    double amount = pair.second;
    s += currency + " : " + std::to_string(amount) + "\n";
  }
  return s;
}

bool Wallet::canFulfillOrder(OrderBookEntry order) {
  std::vector<std::string> currs = CSVReader::tokenise(order.product, '/');
  // ask
  if (order.orderType == OrderBookType::ask) {
    double amount = order.amount;
    std::string currency = currs[0];
    std::cout << "Wallet::canFulfillOrder " << currency << " : " << amount
              << std::endl;

    return containsCurrency(currency, amount);
  }
  // bid
  if (order.orderType == OrderBookType::bid) {
    double amount = order.amount * order.price;
    std::string currency = currs[1];
    std::cout << "Wallet::canFulfillOrder " << currency << " : " << amount
              << std::endl;
    return containsCurrency(currency, amount);
  }

  return false;
}

void Wallet::processSale(OrderBookEntry& sale) {
  std::vector<std::string> currs = CSVReader::tokenise(sale.product, '/');
  // ask
  if (sale.orderType == OrderBookType::asksale) {
    double outgoingAmount = sale.amount;
    std::string outgoingCurrency = currs[0];
    double incomingAmount = sale.amount * sale.price;
    std::string incomingCurrency = currs[1];

    currencies[incomingCurrency] += incomingAmount;
    currencies[outgoingCurrency] -= outgoingAmount;
  }
  // bid
  if (sale.orderType == OrderBookType::bidsale) {
    double incomingAmount = sale.amount;
    std::string incomingCurrency = currs[0];
    double outgoingAmount = sale.amount * sale.price;
    std::string outgoingCurrency = currs[1];

    currencies[incomingCurrency] += incomingAmount;
    currencies[outgoingCurrency] -= outgoingAmount;
  }
}
std::ostream& operator<<(std::ostream& os, Wallet& wallet) {
  os << wallet.toString();
  return os;
}