using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Video;

/// <summary>
/// Class to handle panel with image, video and webcam
/// </summary>
public class PanelWithVideoAndImage : MonoBehaviour
{
    /// <summary>
    /// Reference to the feedback progress bar
    /// </summary>
    public GameObject feedbackProgressObject;

    /// <summary>
    /// Reference to the object containing the message for when the course is loaded in preview mode
    /// </summary>
    public GameObject previewMessage;

    /// <summary>
    /// True if the course is loaded in preview mode, false otherwise
    /// </summary>
    public bool isPreview;

    /// <summary>
    /// Video 'play' sprite
    /// </summary>
    public Sprite playSprite;

    /// <summary>
    /// Video 'pause' sprite
    /// </summary>
    public Sprite pauseSprite;

    /// <summary>
    /// Reference to instructional video player
    /// </summary>
    public VideoPlayer videoPlayer;

    /// <summary>
    /// Refrence to the video play/pause button
    /// </summary>
    public Image playButton;

    /// <summary>
    /// Reference to the webcam
    /// </summary>
    public RawImage webcamScreen;

    /// <summary>
    /// Reference to the image for displaying the current words sprite
    /// </summary>
    public Transform signImageContainer;

    /// <summary>
    /// Reference to the prefab for displaying the image
    /// </summary>
    public GameObject signImagePrefab;

    /// <summary>
    /// Reference to the feedback field
    /// </summary>
    public TMP_Text feedbackText;

    /// <summary>
    /// Reference to the progress bar
    /// </summary>
    public Slider feedbackProgressBar;

    /// <summary>
    /// Reference to the progress bar image, so we can add fancy colors
    /// </summary>
    public Image feedbackProgressImage;

    /// <summary>
    /// Reference to the list of learnables
    /// </summary>
    public List<Learnable> signs;

    /// <summary>
    /// Index of the current learnable in the list with learnables
    /// </summary>
    public int currentSignIndex;

    /// <summary>
    /// Update the display of this panel
    /// </summary>
    public void Display()
    {
        Learnable currentSign = signs[currentSignIndex];
        videoPlayer.aspectRatio = VideoAspectRatio.FitInside;
        videoPlayer.clip = currentSign.clip;
        videoPlayer.Play();

        feedbackProgressObject.SetActive(!isPreview);
        previewMessage.SetActive(isPreview);

        List<Sprite> sprites = new List<Sprite>() { currentSign.image };
        if (currentSign.handGuide != null)
            sprites.Add(currentSign.handGuide);

        foreach (Sprite s in sprites)
        {
            GameObject sprite = GameObject.Instantiate(signImagePrefab, signImageContainer);
            sprite.GetComponent<Image>().sprite = s;
        }
    }

    /// <summary>
    /// This function is called when the pause-button is pressed on the video.
    /// It switches between playing and pausing the video.
    /// It then makes the button invisible when the video is playing, or visible when it's paused.
    /// </summary>
    public void TogglePlayPause()
    {
        if (!videoPlayer.isPlaying)
        {
            // Play video and switch sprite of button
            playButton.sprite = pauseSprite;
            videoPlayer.Play();
        }
        else
        {
            // Pause video and and switch sprite of button
            playButton.sprite = playSprite;
            videoPlayer.Pause();
        }
    }
}