namespace VRTK.Examples
{
    using UnityEngine;
    using UnityEngine.EventSystems;
    using UnityEngine.UI;
    using System.Collections;

    public class UI_Interactions : MonoBehaviour
    {
        private const int EXISTING_CANVAS_COUNT = 4;

        public void Button_Red()
        {
            VRTK_Logger.Info("Red Button Clicked");
        }

        public void Button_Pink()
        {
            VRTK_Logger.Info("Pink Button Clicked");
        }

        public void Toggle(bool state)
        {
            VRTK_Logger.Info("The toggle state is " + (state ? "on" : "off"));
        }

        public void Dropdown(int value)
        {
            VRTK_Logger.Info("Dropdown option selected was ID " + value);
        }

        public void SetDropText(BaseEventData data)
        {
            var pointerData = data as PointerEventData;
            var textObject = GameObject.Find("ActionText");
            if (textObject)
            {
                var text = textObject.GetComponent<Text>();
                text.text = pointerData.pointerDrag.name + " Dropped On " + pointerData.pointerEnter.name;
            }
        }

        public void CreateCanvas()
        {
            StartCoroutine(CreateCanvasOnNextFrame());
        }

        private IEnumerator CreateCanvasOnNextFrame()
        {
            yield return null;

            var canvasCount = FindObjectsOfType<Canvas>().Length - EXISTING_CANVAS_COUNT;
            var newCanvasGO = new GameObject("TempCanvas");
            newCanvasGO.layer = 5;
            var canvas = newCanvasGO.AddComponent<Canvas>();
            var canvasRT = canvas.GetComponent<RectTransform>();
            canvasRT.position = new Vector3(-4f, 2f, 3f + canvasCount);
            canvasRT.sizeDelta = new Vector2(300f, 400f);
            canvasRT.localScale = new Vector3(0.005f, 0.005f, 0.005f);
            canvasRT.eulerAngles = new Vector3(0f, 270f, 0f);

            var newButtonGO = new GameObject("TempButton", typeof(RectTransform));
            newButtonGO.transform.SetParent(newCanvasGO.transform);
            newButtonGO.layer = 5;

            var buttonRT = newButtonGO.GetComponent<RectTransform>();
            buttonRT.position = new Vector3(0f, 0f, 0f);
            buttonRT.anchoredPosition = new Vector3(0f, 0f, 0f);
            buttonRT.localPosition = new Vector3(0f, 0f, 0f);
            buttonRT.sizeDelta = new Vector2(180f, 60f);
            buttonRT.localScale = new Vector3(1f, 1f, 1f);
            buttonRT.localEulerAngles = new Vector3(0f, 0f, 0f);

            newButtonGO.AddComponent<Image>();
            var canvasButton = newButtonGO.AddComponent<Button>();
            var buttonColourBlock = canvasButton.colors;
            buttonColourBlock.highlightedColor = Color.red;
            canvasButton.colors = buttonColourBlock;

            var newTextGO = new GameObject("BtnText", typeof(RectTransform));
            newTextGO.transform.SetParent(newButtonGO.transform);
            newTextGO.layer = 5;

            var textRT = newTextGO.GetComponent<RectTransform>();
            textRT.position = new Vector3(0f, 0f, 0f);
            textRT.anchoredPosition = new Vector3(0f, 0f, 0f);
            textRT.localPosition = new Vector3(0f, 0f, 0f);
            textRT.sizeDelta = new Vector2(180f, 60f);
            textRT.localScale = new Vector3(1f, 1f, 1f);
            textRT.localEulerAngles = new Vector3(0f, 0f, 0f);

            var txt = newTextGO.AddComponent<Text>();
            txt.text = "New Button";
            txt.color = Color.black;
            txt.font = Resources.GetBuiltinResource(typeof(Font), "Arial.ttf") as Font;

            newCanvasGO.AddComponent<VRTK_UICanvas>();
        }
    }
}