using UnityEngine;
using System.Collections;

public class orthoCameraMan : MonoBehaviour {
    public Transform target;
    public Vector3 offset;
    public float minSize;
    public float maxSize;
    public float lowClamp;
    public float highClamp;
    public float dragSpeed;
    public float camFocusSpeed;
    public float camFocusTurnSpeed;

    private float cameraMovement;
    private RaycastHit hit;
    private int loopCount;

    void Start () {

    }

    void LateUpdate () {
        if (target != null) {
            transform.LookAt(target);
            transform.position = target.position + offset;
        }

        //pinch and pull to zoom the camera
        if (Input.touchCount == 2) {
            target = null; //unset any camera targeting
            Touch firstFinger = Input.GetTouch(0);
            Touch secondFinger = Input.GetTouch(1);
            float touchDistance = Vector2.Distance(firstFinger.position, secondFinger.position);
            if (firstFinger.phase == TouchPhase.Moved || secondFinger.phase == TouchPhase.Moved) {
                float lastDistance = Vector2.Distance(firstFinger.position - firstFinger.deltaPosition, secondFinger.position - secondFinger.deltaPosition);
                float moveDistance = Mathf.Clamp(touchDistance - lastDistance, lowClamp, highClamp);
                Camera.main.orthographicSize = Mathf.Clamp(Camera.main.orthographicSize - moveDistance, minSize, maxSize);
            }
        }
        if (Input.touchCount == 1 &&
                Input.GetTouch(0).tapCount == 2 &&
                rayAtTouch(out hit, Input.GetTouch(0).position) &&
                hit.collider.gameObject.layer == (int)Layers.Index.playerActorLayer)
        {
            target = hit.collider.gameObject.transform;
            StartCoroutine(repositionCam());
        }
    }

    public void dragCamera (Vector3 scrollDist) {
        Vector3 normalizeScrollDist = new Vector3(scrollDist.x * Time.deltaTime * dragSpeed,
            0, scrollDist.z * Time.deltaTime * dragSpeed);
        transform.position += normalizeScrollDist;
    }

    IEnumerator repositionCam () {
        while (cameraMovement < 1) {
            cameraMovement += camFocusSpeed * Time.deltaTime;
            transform.position = Vector3.Lerp(transform.position, transform.position + offset, cameraMovement);
            yield return null;
        }
    }

    bool rayAtTouch (out RaycastHit rayHit, Vector3 touchLoc) {
        Ray ray = Camera.main.ScreenPointToRay(touchLoc);
        return Physics.Raycast(ray, out rayHit);
    }
}