using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System;


public class PressTip : MonoBehaviour, IPointerDownHandler, IPointerUpHandler
{
    [SerializeField] GameObject m_Container;
    [SerializeField] float m_Delay = 0f;

    float timer = 0f;
    PointerState pointerState = PointerState.Up;
    bool triggered = false;

    private void OnEnable()
    {
        this.pointerState = PointerState.Up;
        this.m_Container.SetActive(false);
    }

    private void OnDisable()
    {
        this.pointerState = PointerState.Up;
        this.m_Container.SetActive(false);
    }

    public virtual void OnPointerDown(PointerEventData eventData)
    {
        this.pointerState = PointerState.Down;
        this.timer = 0f;
        triggered = false;
    }

    public virtual void OnPointerUp(PointerEventData eventData)
    {
        this.pointerState = PointerState.Up;
        this.m_Container.SetActive(false);
    }

    private void LateUpdate()
    {
        if (this.pointerState != PointerState.Down)
        {
            return;
        }

        this.timer += Time.deltaTime;
        if (this.timer > this.m_Delay && !triggered)
        {
            triggered = true;

            if (this.m_Container != null)
            {
                this.m_Container.SetActive(true);
                AdjustmentContainerPosition(this.m_Container.transform as RectTransform);
            }
        }

    }

    void AdjustmentContainerPosition(RectTransform _container)
    {
        if (_container == null)
        {
            return;
        }

        var viewPortPoint = CameraManager.uiCamera.ScreenToViewportPoint(Input.mousePosition);
        var normalizedOffset = CalculateNormalizedOffset(_container);

        var containerSize = new Vector2(_container.rect.width, _container.rect.height);
        var xOffset = viewPortPoint.x < normalizedOffset.x ? 1 : viewPortPoint.x > (1 - normalizedOffset.x) ? -1 : 0;
        var yOffset = viewPortPoint.y > (1 - normalizedOffset.y * 2) ? -1 : xOffset != 0 ? 0 : 1;

        var uiposition = CameraManager.uiCamera.ViewportToWorldPoint(viewPortPoint);

        _container.position = uiposition.SetZ(0);
        _container.localPosition += new Vector3(xOffset * containerSize.x * 0.5f, yOffset * containerSize.y * 0.5f, -_container.localPosition.z);
    }

    Vector2 CalculateNormalizedOffset(RectTransform _rectTransform)
    {
        var offsetX = _rectTransform.rect.width / Constants.DESIGN_RESOLUTION.x * 0.5f;
        var offsetY = _rectTransform.rect.height / Constants.DESIGN_RESOLUTION.y * 0.5f;

        return new Vector2(offsetX, offsetY);
    }

    enum PointerState
    {
        Down,
        Up
    }

}