import java.util.*;
import java.io.*;

public class Pharmacy {

	public static void Auth() {
		Scanner sc = new Scanner(System.in);
		boolean check = true;
		do {
			System.out.println("Enter Username:");
			String UserName = sc.nextLine();
			System.out.println("Enter Password");
			String Password = sc.nextLine();
			if (UserName.equals("Mahdi") && Password.equals("admin"))
				break;
			else
				System.out.println("Wrong! Please check again. \n");
		} while (check);
		sc.close();
	}

	public static int Read() {
		int m;
		Scanner sc = new Scanner(System.in);
		do {
			try {
				int x = sc.nextInt();
				m=x;
				sc.nextLine();
				break;

			} catch (InputMismatchException e) {
				System.err.println("This is not a number. Please try again.");
				sc.nextLine();
			}
		} while (true);

		return m;
	}

	// Method to send data from file to array
	public static ArrayList<String> FileToAL(String a) throws Exception {
		Scanner rw = new Scanner(new File(a));
		ArrayList<String> m = new ArrayList<String>();

		while (rw.hasNext()) {
			m.add(rw.nextLine());
		}
		rw.close();
		return m;
	}

	// Method to send data from array to file
	public static void ALtoFile(String a, ArrayList<String> b) throws Exception {
		PrintWriter bw = new PrintWriter(new FileWriter(a));
		for (int i = 0; i < b.size() - 1; i = i + 2) {
			bw.printf("%s\r\n", b.get(i));
			bw.printf("%s\r\n", b.get(i + 1));
		}
		bw.flush();
		bw.close();
	}

	// Method to show list
	public static void ShowList(ArrayList<String> a, String x, String y) {
		System.out.printf("%-20s%20s%n", x, y);
		for (int j = 0; j < a.size() - 1; j = j + 2)
			System.out.printf("%-20s%20s%n", a.get(j), a.get(j + 1));
		System.out.println();
	}


	// Method to add a medicine to the array
	public static void AddMed(ArrayList<String> c) {
		Scanner scan = new Scanner(System.in);
		String name;
		do {
			System.out.print("Enter Medecine Name: ");
			name = scan.nextLine();
			if ((CheckIfExists(name, c) == false))
				break;
			else {
				System.out.printf("%s already exists!\n", name);
			}
		} while ((CheckIfExists(name, c) == true));
		c.add(name);
		System.out.print("Enter Quantity: ");
		c.add(String.valueOf(Read()));

		System.out.println("Medecine Added.");
		System.out.println();
	}

	// Method to check if the med exists
	public static boolean CheckIfExists(String a, ArrayList<String> c) {

		for (int i = 0; i < c.size() - 1; i = i + 2) {
			if (a.equals(c.get(i)))
				return true;
		}
		return false;
	}

	// Method to Remove Medicines
	public static void RemoveMed(ArrayList<String> c) throws Exception{
		ShowList(c,"Medicine","Quantity");
		Scanner sc = new Scanner(System.in);
		boolean check = true;
		do {
			System.out.println("Enter the medicine you wish to remove.");
			String name = sc.nextLine();
			if (CheckIfExists(name, c) == false) {
				System.out.println("The medecine doesn't exist");
				continue;
			}
			for (int i = 0; i < c.size() - 1; i = i + 2) {
				if (name.equals(c.get(i))) {
					c.remove(i);
					c.remove(i);
					check = false;
					System.out.println("Medicine removed");
					System.out.println();
					break;
				}
			}

		} while (check);


	}

	// Method to Update the quantity of Medicine
	public static void UpdateMed(ArrayList<String> c) {
		Scanner sc1 = new Scanner(System.in);
		boolean check = false;
		do {
			System.out.println("Enter the Medecine you wish to update");
			String name = sc1.nextLine();
			for (int i = 0; i < c.size() - 1; i = i + 2) {
				if (name.equals(c.get(i))) {
					System.out.println("Enter the quantity you wish to add");
					int quantity = Read();
					c.set(i + 1, (String.valueOf(Integer.parseInt(c.get(i + 1)) + quantity)));
					check = true;
				}
			}
		} while (check = false);

		System.out.println("Quantity updated.");
		System.out.println();
	}

	// Method to Add clients
	public static void AddClient(ArrayList<String> c) {
		Scanner sc = new Scanner(System.in);
		System.out.println("Enter the name of the client: ");
		String name = sc.nextLine();
		c.add(name);
		c.add(String.valueOf(Integer.parseInt(c.get(c.size() - 2)) + 1));

	}

	// Method to add order
	public static void AddOrder(ArrayList<String> c) throws Exception {
		Scanner sc = new Scanner(System.in);
		System.out.printf("You chose to add an order.\nPlease Enter the name of the client: ");
		String name = sc.nextLine();
		PrintWriter bw;
		for (int i = 0; i < c.size(); i = i + 2) {
			if (name.equals(c.get(i))) {
				String fileName = "orderingList_" + c.get(i + 1) + "_.data";
				System.out.println("Enter Medecine Name:");
				String med = sc.nextLine();
				System.out.println("Enter Quantity");
				int quantity = Read();
				bw = new PrintWriter(new FileOutputStream(new File(fileName), true));
				bw.printf("%s\r\n", med);
				bw.printf("%s\r\n", String.valueOf(quantity));
				bw.flush();
				bw.close();
				break;
			}
		}
	}

	// Method to remove client
	public static void RemoveClient(ArrayList<String> c) {
		Scanner sc = new Scanner(System.in);
		boolean check = true;
		do {
			System.out.println("Enter the client you wish to remove.");
			String name = sc.nextLine();
			if (CheckIfExists(name, c) == false) {
				System.out.println("The client doesn't exist");
				continue;
			}
			for (int i = 0; i < c.size() - 1; i = i + 2) {
				if (name.equals(c.get(i))) {
					c.remove(i);
					c.remove(i);
					check = false;
					System.out.println("Client removed.");
					break;
				}
			}

		} while (check);


	}

	// Method to Remove order
	public static void RemoveOrder() {

	}

	public static void main(String[] args) throws Exception {
		// Creating array for Medicines
		ArrayList<String> Meds = new ArrayList<String>();
		Meds = FileToAL("medecines.data");

		// Creating Array for Clients
		ArrayList<String> Clients = new ArrayList<String>();
		Clients = FileToAL("clients.data");

		// Auth();
		System.out.println("Welcome!");
		int m1;
		do {
		System.out.printf(
				"Select one of the shown numbers please! \n1: Manage Medecines Stock \n2: Manage clients ordering lists. \n9: Exit");
		m1 = Read();
		if (m1 == 1) {
			System.out.printf(
					"You chose to manage medicines stock.\n1: to Show List.\n2: to Add. \n3: to Remove.\n4: to Update.\n ");
			int m2 = Read();
			if (m2 == 1) {
				ShowList(Meds, "Medicine", "Quantity");
			} else if (m2 == 2) {
				AddMed(Meds);
			} else if (m2 == 3) {
				RemoveMed(Meds);
			} else if (m2 == 4) {
				UpdateMed(Meds);
				ShowList(Meds, "Medicine", "Quantity");
			} else
				System.out.println("Enter one of the following numbers");
		} else if (m1 == 2) {
			System.out.printf(
					"You chose to manage clients ordering lists.\n1: to Show List.\n2: to Add new client. \n3: to Add new order \n4: to Remove Client.\n5: to Remove order. ");
			int m3 = Read();
			if (m3 == 1) {
				ShowList(Clients, "Client", "ID");
			} else if (m3 == 2) {
				AddClient(Clients);
			} else if (m3 == 3) {
				AddOrder(Clients);
			} else if (m3 == 4) {
				RemoveClient(Clients);
			} else if (m3 == 5) {
				RemoveOrder();
			}
		}
		else if(m1==9) {
			break;
		}

		ALtoFile("medecines.data", Meds);
		ALtoFile("clients.data", Clients);
		} while(true);


	}

}