using UnityEngine;
using System.Collections;

public class CameraZoom : MonoBehaviour
{
    private float _speedMouse = 350.0f;
    private float _speedTouch = 100.0f;
    float touchDist = 0;
    float lastDist = 0;

    private void Update()
    {
        if (SceneModeManager.CompareSceneMode(SceneModes.Navigate) && _G.CAMSET != CamSettings.Ortho && _G.CAMSET != CamSettings.Plan2D)
        {
            float mouseScroll = Input.GetAxis("Mouse ScrollWheel");

            if (mouseScroll != 0 && MouseCheck.InOut() == true)
            {
                ZoomCamera(mouseScroll, false);
            }
        }

        if (SceneModeManager.CompareSceneMode(SceneModes.Navigate) && _G.CAMSET == CamSettings.Ortho || _G.CAMSET == CamSettings.Plan2D)
        {
            float mouseScroll = Input.GetAxis("Mouse ScrollWheel");

            if (mouseScroll != 0 && MouseCheck.InOut() == true)
            {
                Camera cam = GetComponent<Camera>();
                float scale = cam.orthographicSize;
                scale = Mathf.Clamp(scale - mouseScroll * 10,1, float.MaxValue);
                cam.orthographicSize = scale;
                CAPS.SHOW_TOP(true,scale/150);
            }
        }

        if (Input.touchCount == 2)
        {
            Touch touch1 = Input.GetTouch(0);
            Touch touch2 = Input.GetTouch(1);
            SceneModeManager.Instance.SetSceneMode(SceneModes.ZoomTouch);

            if (touch1.phase == TouchPhase.Began && touch2.phase == TouchPhase.Began)
            {
                lastDist = Vector2.Distance(touch1.position, touch2.position);
            }

            if (touch1.phase == TouchPhase.Moved && touch2.phase == TouchPhase.Moved)
            {
                float newDist = Vector2.Distance(touch1.position, touch2.position);
                touchDist = lastDist - newDist;
                lastDist = newDist;

                ZoomCamera(-touchDist, true);
            }
        }
    }
    void ZoomCamera(float scrollValue, bool isTouch)
    {
        Vector3 positionBefore = transform.position;
        Vector3 centerToCamBefore = (positionBefore - _G.CC).normalized;

        float scrollSpeed = isTouch ? _speedTouch: _speedMouse;
        transform.Translate(Mathf.Sign(scrollValue) * scrollSpeed * Time.deltaTime * transform.forward, Space.World);

        Vector3 positionAfter = transform.position;
        Vector3 centerToCamAfter = (positionAfter - _G.CC).normalized;

        float dotTranslation = Vector3.Dot(centerToCamBefore, centerToCamAfter);
        if (dotTranslation < 0f)
        {
            transform.position = _G.CC;
        }
        else if (dotTranslation == 0)
        {
            Vector3 directionTranslate = (positionAfter - positionBefore).normalized;
            float dotDirection = Vector3.Dot(directionTranslate, -1.0f * transform.forward);
            if (dotDirection < 0f)
            {
                transform.position = _G.CC;
            }
        }

        _G.Camz = transform.position.z;
    }
}