import java.util.*;
import java.nio.*;
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 x=0;
		Scanner sc = new Scanner(System.in);
		do {
			try
			{
				x = sc.nextInt();
				sc.nextLine();
				break;

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

	//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();
	}

	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));
    }

	// 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(scan.nextLine());
	        scan.close();
	    }

		// 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)
		{
			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");
								break;
							}
					}

			}while(check);
			sc.close();
		}

		//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);
			sc1.close();
		}

		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));

		}

		public static void AddOrder()
		{

		}

		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);
			sc.close();

		}

		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!");

        System.out.printf("Select one of the shown numbers please! \n1: Manage Medecines Stock \n2: Manage clients ordering lists.");
        int 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();
        	}
        	else if(m3 == 4)
        	{
        		RemoveClient(Clients);
        	}
        	else if(m3 == 5)
        	{
        		RemoveOrder();
        	}
        }
        else
        {

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

}