/// <summary>
/// Brought you by Mrs. YakaYocha
/// https://www.youtube.com/channel/UCHp8LZ_0-iCvl-5pjHATsgw
/// 
/// Please donate: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=RJ8D9FRFQF9VS
/// </summary>

using UnityEngine;
using UnityEngine.UI;
using UnityEngine.UI.Extensions;



public class ScrollingCalendar : MonoBehaviour

{
	public RectTransform monthsScrollingPanel;
	public RectTransform yearsScrollingPanel;
	public RectTransform daysScrollingPanel;

	public GameObject yearsButtonPrefab;
    public GameObject monthsButtonPrefab;
    public GameObject daysButtonPrefab;

    private GameObject[] monthsButtons;
	private GameObject[] yearsButtons;
	private GameObject[] daysButtons;

	public RectTransform monthCenter;
	public RectTransform yearsCenter;
	public RectTransform daysCenter;

	UIVerticalScroller yearsVerticalScroller;
	UIVerticalScroller monthsVerticalScroller;
	UIVerticalScroller daysVerticalScroller;

    public InputField inputFieldDays;
    public InputField inputFieldMonths;
    public InputField inputFieldYears;

    public Text dateText;

    private int daysSet;
    private int monthsSet;
    private int yearsSet;

	private void InitializeYears()
	{
		int currentYear = int.Parse(System.DateTime.Now.ToString("yyyy"));
		
		int[] arrayYears = new int[currentYear+1 - 1900];
		
		yearsButtons = new GameObject[arrayYears.Length];

		for (int i = 0; i < arrayYears.Length; i++)
		{
			arrayYears[i] = 1900 + i;
			
			GameObject clone = (GameObject)Instantiate(yearsButtonPrefab, new Vector3(0, i*80, 0), Quaternion.Euler(new Vector3(0, 0, 0))) as GameObject;
			clone.transform.SetParent(yearsScrollingPanel,false);
			clone.transform.localScale = new Vector3(1, 1, 1);
			clone.GetComponentInChildren<Text>().text = "" + arrayYears[i];
			clone.name = "Year_" + arrayYears[i];
			clone.AddComponent<CanvasGroup>();
			yearsButtons[i] = clone;
			
		}

	}

	//Initialize Months
	private void InitializeMonths()
	{
		int[] months = new int[12];

		monthsButtons = new GameObject[months.Length];
		for (int i = 0; i < months.Length; i++)
		{
			string month = "";
			months[i] = i;
			
			GameObject clone = (GameObject)Instantiate(monthsButtonPrefab, new Vector3(0, i * 80, 0), Quaternion.Euler(new Vector3(0, 0, 0))) as GameObject;
			clone.transform.SetParent(monthsScrollingPanel,false);
			clone.transform.localScale = new Vector3(1, 1, 1);

			switch(i)
			{
			case 0:
				month = "Jan";
				break;
			case 1:
				month = "Feb";
				break;
			case 2:
				month = "Mar";
				break;
			case 3:
				month = "Apr";
				break;
			case 4:
				month = "May";
				break;
			case 5:
				month = "Jun";
				break;
			case 6:
				month = "Jul";
				break;
			case 7:
				month = "Aug";
				break;
			case 8:
				month = "Sep";
				break;
			case 9:
				month = "Oct";
				break;
			case 10:
				month = "Nov";
				break;
			case 11:
				month = "Dec";
				break;
			}
			
			clone.GetComponentInChildren<Text>().text = month;
			clone.name = "Month_" + months[i];
			clone.AddComponent<CanvasGroup>();
			monthsButtons[i] = clone;
		}
	}

	private void InitializeDays()
	{
		int[] days = new int[31];
		daysButtons = new GameObject[days.Length];
		
		for (var i = 0; i < days.Length; i++)
		{
			days[i] = i+1;
			GameObject clone = (GameObject)Instantiate(daysButtonPrefab, new Vector3(0, i * 80, 0), Quaternion.Euler(new Vector3(0, 0, 0))) as GameObject;
			clone.transform.SetParent(daysScrollingPanel,false);
			clone.transform.localScale = new Vector3(1, 1, 1);
			clone.GetComponentInChildren<Text>().text = "" + days[i];
			clone.name = "Day_" + days[i];
			clone.AddComponent<CanvasGroup>();
			daysButtons[i] = clone;
		}
	}

	// Use this for initialization
    public void Awake()
    {
		InitializeYears();
		InitializeMonths();
		InitializeDays();

        //Yes Unity complains about this but it doesn't matter in this case.
		monthsVerticalScroller = new UIVerticalScroller(monthsScrollingPanel, monthsButtons, monthCenter);
		yearsVerticalScroller = new UIVerticalScroller (yearsScrollingPanel, yearsButtons, yearsCenter);
		daysVerticalScroller = new UIVerticalScroller (daysScrollingPanel, daysButtons, daysCenter);

		monthsVerticalScroller.Start();
		yearsVerticalScroller.Start();
		daysVerticalScroller.Start();
    }

    public void SetDate()
    {
        daysSet = int.Parse(inputFieldDays.text) - 1;
        monthsSet = int.Parse(inputFieldMonths.text) - 1;
        yearsSet = int.Parse(inputFieldYears.text) - 1900;

        daysVerticalScroller.SnapToElement(daysSet);
        monthsVerticalScroller.SnapToElement(monthsSet);
        yearsVerticalScroller.SnapToElement(yearsSet);
    }

	void Update () 
	{
		monthsVerticalScroller.Update();
		yearsVerticalScroller.Update();
		daysVerticalScroller.Update();

        string dayString = daysVerticalScroller.GetResults();
        string monthString = monthsVerticalScroller.GetResults();
        string yearsString = yearsVerticalScroller.GetResults();

        if (dayString.EndsWith("1") && dayString != "11")
            dayString = dayString + "st";
        else if (dayString.EndsWith("2") && dayString != "12")
            dayString = dayString + "nd";
        else if (dayString.EndsWith("3") && dayString != "13")
            dayString = dayString + "rd";
        else
            dayString = dayString + "th";

        dateText.text = monthString + " " + dayString + " " + yearsString;
	}

    public void DaysScrollUp()
    {
        daysVerticalScroller.ScrollUp();
    }

    public void DaysScrollDown()
    {
        daysVerticalScroller.ScrollDown();
    }

    public void MonthsScrollUp()
    {
        monthsVerticalScroller.ScrollUp();
    }

    public void MonthsScrollDown()
    {
        monthsVerticalScroller.ScrollDown();
    }

    public void YearsScrollUp()
    {
        yearsVerticalScroller.ScrollUp();
    }

    public void YearsScrollDown()
    {
        yearsVerticalScroller.ScrollDown();
    }
}