#include <string>
#include <iostream>
#include <vector>
#include <Windows.h>
#include <sstream>
using namespace std;

static const double INITIAL_BALANCE = 500;

class User
{
public:
	int ID;
	string Password;
	double Balance;

	User(int id, string pass, double balance)
	{
		this->ID = id;
		this->Password = pass;
		this->Balance = balance;
	}

	void Withdraw(double x)
	{
		if (x < 0)
			throw exception("Withdrawal amount must be a positive number");
		if (x > this->Balance)
			throw exception("The account does not have enough balance");
		Balance -= x;
	}

	void Deposit(double x)
	{
		if (x > 500)
			throw exception("Too much money?");
		if (x < 0)
			throw exception("Deposit amount must be a positive number");
		Balance += x;
	}

	void TransferTo(User* target, double amount)
	{
		this->Withdraw(amount);
		target->Deposit(amount);
	}

	string GetName()
	{
		stringstream s;
		s << "User" << (this->ID + 1);
		return s.str();
	}
};

vector<User*> users;

void FillByPass(string passwordList[], int num)
{
	for (int i = 0; i < users.size(); i++)
	{
		delete users[i];
	}
	users.clear();
	for (int i = 0; i < num; i++)
	{
		users.push_back(new User(i, passwordList[i], INITIAL_BALANCE));
	}
}


int main()
{
	string pass[] = {"password1", "password2", "password3"};
	FillByPass(pass, 3);
	cout << "=======================================" << endl;
	cout << "Welcome in our great banking system!" << endl;
	cout << "=======================================" << endl;
	::Sleep(2000);
	while (true)
	{
		cout << "Choose account you want to manage!" << endl;
		for (int i = 0; i < users.size(); i++)
		{
			cout << "#" << users[i]->GetName() << " ";
		}
		cout << endl;
		bool authed = false;
		User* currentUser = NULL;
		do
		{
			cout << "Username: ";
			string s;
			cin >> s;
			int user = -1;
			for (int i = 0; i < users.size(); i++)
			{
				if (s == users[i]->GetName())
				{
					user = i;
					break;
				}
			}
			cout << "Password: ";
			cin >> s;
			if (user >= 0 && s == users[user]->Password)
			{
				authed = true;
				currentUser = users[user];
				cout << "You have been logged in as " << currentUser->GetName() << endl;
			}
			else
			{
				cout << "Invalid credentials" << endl;
			}
		}
		while (!authed);

		Sleep(2000);
		system("cls");
		bool stop = false;
		while (!stop)
		{
			double op = 0;
			int input;
			//double x; //operation amount
			cout << "These are options you are able to do on your account.\nWrite provided number to choose which one you want " << endl;
			cout << "1. Balance" << endl;
			cout << "2. Withdraw" << endl;
			cout << "3. Deposit" << endl;
			cout << "4. Transfer" << endl;
			cout << "5. Log out" << endl;
			cout << "6. Exit" << endl;
			cout << "Input: ";
			cin >> input;
			switch (input)
			{
			case 1:
				cout << "Your balance: " << currentUser->Balance << "$" << endl;
				getchar();
				break;
			case 2:
				cout << "How much money do you want to withdraw? ";
				cin >> op;
				try
				{
					currentUser->Withdraw(op);
					cout << "Money has been successfully withdrawn from your account" << endl;
				}
				catch (exception e)
				{
					cout << "Error: " << e.what() << endl;
				}

				getchar();
				break;
			case 3:
				cout << "How much money do you want to deposit? ";
				cin >> op;
				try
				{
					currentUser->Deposit(op);
					cout << "You have successfully deposited your money" << endl;
				}
				catch (exception e)
				{
					cout << "Error: " << e.what();
				}
				getchar();
				break;
			case 4:
				int id;
				cout << "Who do you want to trasfer money to? Use only the ID of the user. ";
				cin >> id;
				if (id <= 0 || id > users.size())
				{
					cout << "No such user" << endl;
					break;
				}

				cout << "How much money do you want to trasfer? ";
				cin >> op;
				try
				{
					currentUser->TransferTo(users[id - 1], op);
					cout << "You have successfully transferred the money" << endl;
				}
				catch (exception e)
				{
					cout << "Error: " << e.what();
				}
				getchar();
				break;
			case 5:
				stop = true;
				break;
			case 6:
				return 1;
			default:
				cout << "Error";
				getchar();
				break;
			}
			getchar();
			system("cls");
		}
	}

	return 0;
}