/// <summary>
/// write by 52cwalk,if you have some question ,please contract lycwalk@gmail.com
/// </summary>

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

public class DeviceCameraController : MonoBehaviour {

	public DeviceCamera dWebCam
	{
		get
		{ 
			return webcam;
		}
	}

	private DeviceCamera webcam;
    GameObject e_CameraPlaneObj;
	bool isCorrected = false;
	float screenVideoRatio = 1.0f;
	public bool isUseEasyWebCam = true;

    public bool isPlaying
	{
		get{
			if (webcam != null) {
				return webcam.isPlaying ();
			} else {
				return false;
			}
		}
	}

	void Start()
	{
        webcam = new DeviceCamera (isUseEasyWebCam);
		e_CameraPlaneObj = transform.Find ("CameraPlane").gameObject;
		//StartWork ();
	}

	// Update is called once per frame  
	void Update()  
	{  
		if (webcam != null && webcam.isPlaying()) {
			if (webcam.Width() > 200 && !isCorrected) {
				correctScreenRatio();
			}

			if(e_CameraPlaneObj.activeSelf)
			{
				e_CameraPlaneObj.GetComponent<Renderer>().material.mainTexture = webcam.preview;
			}
		}
	}

	/// <summary>
	/// start the work.
	/// </summary>
	public void StartWork()
	{
#if UNITY_ANDROID
		if (!EasyWebCam.checkPermissions())
        {
            requestCameraPermissions();
			return;
        }
#endif
        if (this.webcam != null) {
			this.webcam.Play ();
		}
	}

	/// <summary>
	/// Stops the work.
	/// when you need to leave current scene ,you must call this func firstly
	/// </summary>
	public void StopWork()
	{
		if (this.webcam != null && this.webcam.isPlaying()) {
			this.webcam.Stop ();
		}
		if(e_CameraPlaneObj.activeSelf)
		{
			e_CameraPlaneObj.GetComponent<Renderer>().material.mainTexture = null;
		}
	}

	/// <summary>
	/// Corrects the screen ratio.
	/// </summary>
	void correctScreenRatio()
	{

		int videoWidth = 1920;
		int videoHeight = 1440;
		int ScreenWidth = 1920;
		int ScreenHeight = 1440;


		float videoRatio = 1;
		float screenRatio = 1;

		if (this.webcam != null) {
			videoWidth = webcam.Width();
			videoHeight = webcam.Height();
		}

		videoRatio = videoWidth * 1.0f / videoHeight;
#if !UNITY_EDITOR && (UNITY_ANDROID || UNITY_IOS)
        ScreenWidth = Mathf.Max (Screen.width, Screen.height);
		ScreenHeight = Mathf.Min (Screen.width, Screen.height);
#else
        ScreenWidth = Screen.width;
        ScreenHeight = Screen.height;
#endif
        screenRatio = ScreenWidth * 1.0f / ScreenHeight;

		screenVideoRatio = screenRatio / videoRatio;
		isCorrected = true;

		if (e_CameraPlaneObj != null) {
			e_CameraPlaneObj.GetComponent<CameraPlaneController>().correctPlaneScale(screenVideoRatio);
		}
	}
    
    void requestCameraPermissions()
    {
        CameraPermissionsController.RequestPermission(new[] { EasyWebCam.CAMERA_PERMISSION }, new AndroidPermissionCallback(
            grantedPermission =>
            {
				StartCoroutine(waitTimeToOpenCamera());				
				// The permission was successfully granted, restart the change avatar routine
			},
            deniedPermission =>
            {
                // The permission was denied
            },
            deniedPermissionAndDontAskAgain =>
            {
                // The permission was denied, and the user has selected "Don't ask again"
                // Show in-game pop-up message stating that the user can change permissions in Android Application Settings
                // if he changes his mind (also required by Google Featuring program)
            }));
    }
    
    IEnumerator waitTimeToOpenCamera()
    {
		yield return new WaitForEndOfFrame();// (0.1f);
		StartWork();
    }
}