using UnityEngine;
using UnityEngine.UI;

/// <summary>
/// Class to manage all webcam stuff inside the SpellingBee minigame
/// </summary>
public class JustSignWebcam : MonoBehaviour
{   
    /// <summary>
    /// Index of the current camera
    /// </summary>
    int camdex = 0;

    /// <summary>
    /// Texture to paste on the display
    /// </summary>
    WebCamTexture tex;

    /// <summary>
    /// Display for the video feed
    /// </summary>
    public RawImage display;

    /// <summary>
    /// Setup the webcam correctly
    /// </summary>
    void Awake()
    {
        WebCamDevice device = WebCamTexture.devices[camdex];
        tex = new WebCamTexture(device.name);
        display.texture = tex;

        tex.Play();
    }

    /// <summary>
    /// Swap webcam by cycling through the `WebCamTexture.devices` list
    /// </summary>
    public void SwapCam()
    {
        if (WebCamTexture.devices.Length > 0)
        {
            // Stop the old camera
            display.texture = null;
            tex.Stop();
            tex = null;

            // Find the new camera
            camdex += 1;
            camdex %= WebCamTexture.devices.Length;

            // Start the new camera
            WebCamDevice device = WebCamTexture.devices[camdex];
            tex = new WebCamTexture(device.name);
            display.texture = tex;

            tex.Play();
        }
    }

    /// <summary>
    /// Scene changing is implemented here to avoid problems with webcam
    /// </summary>
    public void GotoThemeSelection()
    {
        display.texture = null;
        tex.Stop();
        tex = null;

        SystemController.GetInstance().BackToPreviousScene();
    }
}