using UnityEngine;
using System.Collections;

public class Calc : MonoBehaviour
{
    public TextMesh displayText;
    public GameObject[] numButtons = new GameObject[10];
    public GameObject[] Operators = new GameObject[4];
    public bool isRunning = false;

    string prevNumb = "";
	float sum;
	float number;
    // Use this for initialization
    void Start()
    {

    }

	public float Calculate(float a, float b, string r)
	{
		switch (r) {
		case "+": return a + b;
			break;

		case "-": return a - b;
			break;

		case "/": return a / b;
			break;

		case "*": return a * b;
			break;
		}
		return 0; // ha med denna om den gnäller på att funktionen inte returnerar något
	}

    // Update is called once per frame
    void Update()
    {
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;

        if (Input.GetMouseButtonDown(0))
        {
            if (Physics.Raycast(ray, out hit, 1000))
            {
				// Turns calculator ON
                if (hit.transform.gameObject.name == "ON")
                {
                    isRunning = true;
                    prevNumb = "";
                    displayText.text = "0";
                }

				// Turns calculator OFF
                if (hit.transform.gameObject.name == "OFF")
                {
                    isRunning = false;
                    prevNumb = "";
                    displayText.text = "";
                }

                if (isRunning == true)
                {

                    // Checks if the button is a number
                    for (int i = 0; i < numButtons.Length; i++)
                    {
                        if (hit.transform.gameObject == numButtons[i].gameObject)
                        {
                            print(prevNumb + numButtons[i]);
                            displayText.text = prevNumb + numButtons[i].name;
                            prevNumb += numButtons[i].name;
                        }
                    }

					// Checks if the button is an operator
					for (int i = 0; i < Operators.Length; i++)
					{
						if (hit.transform.gameObject == Operators[i].gameObject)
						{
							number = float.Parse(prevNumb);
							prevNumb = "";
							sum = Calculate(sum, number, Operators[i].name);
							displayText.text = number.ToString();
							print(Operators[i]); // denna kan du ha kvar som debugtext, men ska bort sen tycker jag

						}

						if (hit.transform.gameObject.name == "=")
						{
							Calculate (sum, number, Operators[i].name);
						}
                    }
				}
        	}
    	}
	}
}