import javax.swing.*;
import java.io.*;
import java.util.*;

public class Project2
{


	public static void main(String [] args) throws IOException
	{
		String userName,password;
		String account = "";
		String optionA = "y";
		String optionB = "n";
		File accountInfo = new File ("Users.txt");
		FileWriter usersInfo = new FileWriter(accountInfo,true);
		PrintWriter edit = new PrintWriter(usersInfo);
		String filePath = ("Users.txt");
		String errorMessage1 = usersInfo + " not found";
		String errorMessage2 = "No users registered";

		if (!(accountInfo.exists()))
			JOptionPane.showMessageDialog(null,errorMessage1);
		else if (accountInfo.length() == 0)
			JOptionPane.showMessageDialog(null,errorMessage2);
		else
		{
			createUser();
		}
		edit.close();
	}

	public static void createUser() throws IOException
	{
		String userName,password;
		String account = "";
		String optionA = "y";
		String optionB = "n";
		File accountInfo = new File ("Users.txt");
		FileWriter usersInfo = new FileWriter(accountInfo,true);
		PrintWriter edit = new PrintWriter(usersInfo);
		String filePath = ("Users.txt");

		while(!account.equals(optionA)&& !account.equals(optionB))
		{
			account = JOptionPane.showInputDialog(null,"Do you have an existing account?  Y/N");
			account = account.toLowerCase();
			if (account.equals(optionA))
			{
				userName = JOptionPane.showInputDialog(null,"Enter username");
				password = JOptionPane.showInputDialog(null,"Enter password");
				verifyLogin(userName,password,filePath);
			}
			else if (account.equals(optionB))
			{
				userName = JOptionPane.showInputDialog(null,"Please enter your desired username");
				password = JOptionPane.showInputDialog(null,"Please enter your desired password");
				String freshUser = userName + "," + password;
				edit.println(freshUser);
			}
			else
				JOptionPane.showMessageDialog(null,"Please enter either Y or N");
		}
		edit.close();
	}

	public static void verifyLogin(String username, String password, String usersInfo)
	{
		String line;
		String [] parts;
		try(BufferedReader br = new BufferedReader(new FileReader(usersInfo)))
		{
			line = br.readLine();
			parts = line.split(",");
			if(username.equals(parts[0]) && password.equals(parts[1]))  //first line in the Users.txt is reserved for admin only
			{
				JOptionPane.showMessageDialog(null,"Welcome administrator " + username);
				administrator();
			}
			else
			{
				while((line = br.readLine()) != null)
				{
					parts = line.split(",");
					if(username.equals(parts[0]) && password.equals(parts[1]))
					{
						JOptionPane.showMessageDialog(null,"Welcome user " + username);
						user();
					}
				}
				JOptionPane.showMessageDialog(null,"User not found");
				createUser();
			}
		}
		catch (Exception a)
		{
			JOptionPane.showMessageDialog(null,"Unknown error occured");
		}
	}

	public static void administrator() throws IOException
	{
		String A = "Register a new user";
		String B = "Add a new facility";
		String C = "View availability of a facility";
		String D = "View bookinngs";
		String E = "Remove an existing facility";
		String F = "Make bookings";
		String G = "Record payments";
		String H = "View account statements";
		String[] choices = { A, B, C, D, E, F, G, H };

		String input = (String) JOptionPane.showInputDialog(null, "Choose action",
			"Actions available", JOptionPane.QUESTION_MESSAGE, null, choices, choices[0]);

		if (input.equals(A))
			registerANewUser();
		else if (input.equals(B))
			System.out.print("it works"); //addFacility();
		else if (input.equals(C))
			System.out.print("it works"); //viewFacility();
		else if (input.equals(D))
			System.out.print("it works"); //viewBookings();
		else if (input.equals(E))
			System.out.print("it works"); //remove();
		else if (input.equals(F))
			System.out.print("it works"); //makeBookings();
		else if (input.equals(G))
			System.out.print("it works"); //recordPayments();
		else if (input.equals(H))
			System.out.print("it works"); //viewAccountStatements();
	}

	public static void user()
	{
		String A = "View bookinngs";
		String B = "View account statements";
		String[] choices = { A, B };

		String input = (String) JOptionPane.showInputDialog(null, "Choose action",
			"Actions available", JOptionPane.QUESTION_MESSAGE, null, choices, choices[0]);

		if (input.equals(A))
			System.out.print("it works"); //viewBookings();
		else if (input.equals(B))
			System.out.print("it works"); //viewAccountStatements();
	}

	public static void registerANewUser() throws IOException
	{
		String userName,password;
		File accountInfo = new File ("Users.txt");
		FileWriter usersInfo = new FileWriter(accountInfo,true);
		PrintWriter edit = new PrintWriter(usersInfo);

		userName = JOptionPane.showInputDialog(null,"Please enter your desired username");
		password = JOptionPane.showInputDialog(null,"Please enter your desired password");
		String freshUser = userName + "," + password;
		edit.println(freshUser);
		edit.close();
		administrator();
	}


}