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


public class AVPro360 : MonoBehaviour
{
    public Camera workingCamera;
    public DShowMoviePlayer _movie;

    //public bool fix_perspective = true;
    [Range(0.0f, 1.0f)]
    public float fix_perspective;

    [Range(0.0f, 1.0f)]
    public float fix_rotate;

    public float degree = 0;
    public int frameOffset;
    public int currentFrame;
    public int frameCount
    {
        get
        {
            return _frame_count;
        }
    }
    private int _frame_count;
    private float _f_frame;
    private RawImage _rawImage;

    void Start()
    {
        //Application.targetFrameRate = 60;
    }

    float deg_2_frame(float deg)
    {
        return Mathf.Repeat(deg / 360.0f * _frame_count + frameOffset, _frame_count);
    }
    float get_degree(Vector3 v)
    {
        Vector3 z = new Vector3(0.0f, 0.0f, 1.0f);
        v.y = 0;
        v.Normalize();
        Vector3 axis = Vector3.Cross(v, z).normalized;
        return Math.Sign(axis.y) * Mathf.Rad2Deg * Mathf.Acos(Vector3.Dot(v, z));
    }
    public bool isReady()
    {
        return _movie != null;
    }
    // Update is called once per frame
    void Update()
    {
        if (isReady() == false)
            return;

        if (_frame_count == 0)
        {
            _frame_count = (int)_movie.TotalNumFrames;
        }

        float degree_offset = 0;

        Camera cam = workingCamera == null ? Camera.main : workingCamera;

        Ray ray = cam.ScreenPointToRay(cam.WorldToScreenPoint(transform.position));
        degree_offset += get_degree(ray.direction) * fix_perspective;

        Vector3 dir = transform.parent.forward;
        degree_offset += -get_degree(dir) * fix_rotate;

        _f_frame = deg_2_frame(degree + degree_offset);

        currentFrame = Mathf.RoundToInt(_f_frame) % _frame_count;
        //Debug.Log("currentFrame = " + currentFrame);
        _movie.Frame = (uint)currentFrame;

        transform.rotation = cam.transform.rotation;
    }
}