using System.Globalization;
using UnityEngine;
using TMPro;

public class PrimeNumberChecker : MonoBehaviour
{
    public TextMeshProUGUI outputText;
    private TMP_InputField textInputField;

    private int intInput;

    private void Start()
    {
        textInputField = GetComponent<TMP_InputField>();
    }

    private void Update()
    {
        if (Input.GetKeyDown(KeyCode.Return))
        {
            //Check if a number was inputted or not
            if (int.TryParse(textInputField.text, NumberStyles.Number, CultureInfo.CurrentCulture.NumberFormat, out intInput))
            {
                //Call function to test for prime or not
                if (CheckInput(intInput))
                {
                    outputText.text = "'" + intInput.ToString("#,##0") + "' \nIS a prime number!";
                }
                else
                {
                    outputText.text = "'" + intInput.ToString("#,##0") + "' \nIs NOT a prime number!";
                }
            }
            //Tell user they didn't enter a number
            else
            {
                outputText.text = "No int (Number) was entered. \nOr int too large.";
            }

            //Reset input field
            textInputField.text = "";
        }
    }

    public bool CheckInput(int input)
    {
        //Get the modulo (remainder) to check if prime
        int remainderNum;

        //Loop through all possible numbers
        for(int i = (input - 1); i > 0; i--)
        {
            //Set remainder to modulo of original number and current loop iteration
            remainderNum = input % i;

            //End loop and return false if any number other than 1 has no remainder
            if(remainderNum == 0 && i != 1)
            {
                return false;
            }
        }
        //Return true since no number can be divided evenly
        return true;
    }
}