using UnityEngine;
using System.Collections;
using System;

public class ConfirmScreen : GameScreen 
{
    private Rect _rectBackground, _rectSelector, _rectTitle;

    private Rect[] _rectsOptions;
    private string _title;
    private string[] _menuOptions;
    private int _currentSelection = 0;

    private int _fontSize;

    private Action _confirmationFunction;

	void Start () 
    {
        // Initialization
        Type = ScreenType.Confirm;
        _fontSize = GUIState.GuiSkin.label.fontSize;

        // Menu options
        _menuOptions = new string[] { "Yes", "No" };

        // Display rects
        float width = GUIState.Width / 2;
        float height = _fontSize * (_menuOptions.Length + 2) * 1.5f;
        float xPos = GUIState.ViewPort.x + (GUIState.ViewPort.width / 2) - (width / 2);
        float yPos = GUIState.ViewPort.y + (GUIState.ViewPort.height / 2) - (height / 2);

        _rectBackground = new Rect(xPos, yPos, width, height);

        _rectTitle = new Rect(_rectBackground.x + _fontSize, _rectBackground.y + (_fontSize), 
            _rectBackground.width - _fontSize, _fontSize * 1.5f);

        _rectsOptions = new Rect[_menuOptions.Length];
        float optionIndent = _fontSize * 3f;
        for (int i = 0; i < _rectsOptions.Length; i++)
        {
            _rectsOptions[i] = new Rect(_rectBackground.x + optionIndent,
                _rectBackground.y + _fontSize + (_fontSize * 1.5f * (i + 1)),
                _rectBackground.width - optionIndent, _fontSize * 1.5f);
        }

        // Selector
        UpdateSelectorPosition();

        gameObject.SetActive(false);
	}
	
	void OnGUI()
    {
        GUI.skin = GUIState.GuiSkin;

        GUI.Box(_rectBackground, "");

        for(int i = 0; i < _menuOptions.Length; i++)
        {
            GUI.Label(_rectsOptions[i], _menuOptions[i]);
        }

        GUI.Label(_rectTitle, _title);

        GUI.DrawTexture(_rectSelector, GUIState.Selector);
    }

    private void UpdateSelectorPosition()
    {
        Rect selected = _rectsOptions[_currentSelection];

        _rectSelector = new Rect(selected.x - _fontSize,
            selected.y + (selected.height / 3) - (_fontSize / 4),
            _fontSize / 2, _fontSize / 2);
    }

    public override void HandleDirection(Direction in_direction)
    {
        switch (in_direction)
        {
            case Direction.North:
                if (_currentSelection > 0)
                {
                    _currentSelection--;
                }
                break;
            case Direction.South:
                if (_currentSelection < _menuOptions.Length - 1)
                {
                    _currentSelection++;
                }
                break;
        }

        UpdateSelectorPosition();
    }

    public override void HandleAButton()
    {
        switch (_menuOptions[_currentSelection].ToLower())
        {
            case "yes":
                _confirmationFunction();
                break;
            case "no":
                GUIState.PreviousScreen();
                break;
        }
    }

    public override void HandleBButton()
    {
        GUIState.PreviousScreen();
    }

    public override void HandleStartButton()
    {
        // Do nothing
    }

    public void Setup(string in_title, Action in_confirmationFunction)
    {
        _title = in_title;
        _confirmationFunction = in_confirmationFunction;
    }
}