using System;
using Convai.Scripts.Utils;
using Service;
using TMPro;
using UnityEngine;
using UnityEngine.UI;
using Logger = Convai.Scripts.Utils.Logger;

public class ConvaiFeedbackHandler : MonoBehaviour
{
    [SerializeField] private Button _thumbsUPButton;
    [SerializeField] private Button _thumbsDownButton;

    [SerializeField] private GameObject _thumbsUPFill;
    [SerializeField] private GameObject _thumbsDownFill;

    private string _interactionID;
    private TextMeshProUGUI _feedbackText;

    private string _feedbackTextString;

    /// <summary>
    /// Awake is called when the script instance is being loaded.
    /// </summary>
    private void Awake()
    {
        _feedbackText = GetComponentInParent<TextMeshProUGUI>();
    }

    /// <summary>
    /// Called when the object becomes enabled and active.
    /// </summary>
    private void OnEnable()
    {
        ConvaiGRPCAPI.Instance.OnResultReceived += ConvaiGRPCAPI_OnResultReceived;
        _thumbsUPButton.onClick.AddListener((() => OnFeedbackButtonClicked(_thumbsUPButton)));
        _thumbsDownButton.onClick.AddListener((() => OnFeedbackButtonClicked(_thumbsDownButton)));
    }

    /// <summary>
    /// Called when the object is disabled.
    /// </summary>
    private void OnDisable()
    {
        ConvaiGRPCAPI.Instance.OnResultReceived -= ConvaiGRPCAPI_OnResultReceived;
        _thumbsUPButton.onClick.RemoveAllListeners();
        _thumbsDownButton.onClick.RemoveAllListeners();

        _thumbsUPFill.SetActive(false);
        _thumbsDownFill.SetActive(false);
    }

    /// <summary>
    /// Handles the event when a result is received from ConvaiGRPCAPI.
    /// </summary>
    /// <param name="result">The result received.</param>
    private void ConvaiGRPCAPI_OnResultReceived(GetResponseResponse result)
    {
        // Check if InteractionId is not null or empty.
        if (result.InteractionId.Length > 0)
        {
            _interactionID = result.InteractionId;
            ConvaiGRPCAPI.Instance.OnResultReceived -= ConvaiGRPCAPI_OnResultReceived;
        }
    }

    /// <summary>
    /// Handles the event when the feedback button is clicked.
    /// </summary>
    private void OnFeedbackButtonClicked(Button button)
    {
        if (button == _thumbsUPButton)
        {
            SendFeedback(true);
        }
        else if (button == _thumbsDownButton)
        {
            SendFeedback(false);
        }
    }

    /// <summary>
    /// Sends feedback to ConvaiGRPCAPI asynchronously.
    /// </summary>
    /// <param name="thumbsUP">Indicates whether the feedback is a thumbs up or thumbs down.</param>
    private async void SendFeedback(bool thumbsUP)
    {
        if (string.IsNullOrEmpty(_interactionID))
        {
            Logger.Error("InteractionId is null or empty", Logger.LogCategory.Character);
            return;
        }

        // Set the fill visuals for thumbs up and thumbs down buttons.
        HandleThumbsFill(thumbsUP);

        // Extract feedback text after the colon character.
        string feedbackText = RemoveBeforeColon(_feedbackText.text);

        // Send feedback to ConvaiGRPCAPI.
        await ConvaiGRPCAPI.Instance.SendFeedback(thumbsUP, _interactionID, feedbackText);
    }

    /// <summary>
    /// Removes the text before the colon character in the given string.
    /// </summary>
    /// <param name="text">The input text.</param>
    /// <returns>The modified text after removing the portion before the colon.</returns>
    private string RemoveBeforeColon(string text)
    {
        int colonIndex = text.IndexOf(':', StringComparison.Ordinal);
        if (colonIndex != -1)
        {
            return text.Substring(colonIndex + 2);
        }

        return text;
    }

    /// <summary>
    /// Sets the fill state of the Thumbs Up and Thumbs Down buttons.
    /// </summary>
    /// <param name="thumbsUP">Indicates whether the feedback is a thumbs up or thumbs down.</param>
    private void HandleThumbsFill(bool thumbsUP)
    {
        _thumbsUPFill.SetActive(thumbsUP);
        _thumbsDownFill.SetActive(!thumbsUP);
    }
}