using UnityEngine;
using UnityEngine.UIElements;

/// <summary>
///     singleton for a single source of truth game state and flow management
/// </summary>
public class SideViewUI : MonoBehaviour
{
    /// <summary>
    ///     button to change to transition to the account view
    /// </summary>
    private Button _accountButton;

    /// <summary>
    ///     text that displays the users stable chroma accuracy
    /// </summary>
    private Label _chromaAccuracyText;

    /// <summary>
    ///     text that displays the connection status to the backend
    /// </summary>
    private Label _connectionStatusText;

    /// <summary>
    ///     text that displays the users stable hue accuracy
    /// </summary>
    private Label _hueAccuracyText;

    /// <summary>
    ///     button to transition to the leaderboard view
    /// </summary>
    private Button _leaderboardButton;

    /// <summary>
    ///     text that displays the users stable lightness accuracy
    /// </summary>
    private Label _lightnessAccuracyText;

    /// <summary>
    ///     button to transition to the game view
    /// </summary>
    private Button _playButton;

    /// <summary>
    ///     text that displays the username
    /// </summary>
    private Label _playerNameText;

    /// <summary>
    ///     text that displays the users' rating
    /// </summary>
    private Label _playerRatingText;

    private void Start()
    {
        GameManager.Instance.RegisterOnLocalPlayerDataUpdate(RenderFromPlayerData);
    }

    /// <summary>
    ///     function to subscribe button events to their respective functions
    /// </summary>
    private void OnEnable()
    {
        var ui = GetComponent<UIDocument>().rootVisualElement;

        _playButton = ui.Q<Button>("PlayButton");
        _playButton.clicked += OnPlayButtonClicked;

        _leaderboardButton = ui.Q<Button>("LeaderboardButton");
        _leaderboardButton.clicked += OnLeaderboardButtonClicked;

        _accountButton = ui.Q<Button>("AccountButton");
        _accountButton.clicked += OnAccountButtonClicked;

        _lightnessAccuracyText = ui.Q<Label>("LightnessAccuracyText");
        _hueAccuracyText = ui.Q<Label>("HueAccuracyText");
        _chromaAccuracyText = ui.Q<Label>("ChromaAccuracyText");
    }


    /// <summary>
    ///     function to update the ui with the latest data
    /// </summary>
    /// <param name="localPlayerData">the local player data to render the ui from</param>
    private void RenderFromPlayerData(LocalPlayerData localPlayerData)
    {
        // calculate averages from both recent local scores and online scores
        var totalLightness = 0f;
        var totalChromaAcc = 0f;
        var totalHueAcc = 0f;
        var totalRounds = 0;

        // average out all the scores we have to get a stable-ish average

        foreach (var localScore in localPlayerData.RecentLocalScores)
        {
            totalLightness += localScore.AvgLightnessAccuracy;
            totalChromaAcc += localScore.AvgChromaAccuracy;
            totalHueAcc += localScore.AvgHueAccuracy;
            totalRounds += localScore.NoOfRounds;
        }

        foreach (var onlineScore in localPlayerData.RecentOnlineScores)
        {
            totalLightness += onlineScore.AvgLightnessAccuracy;
            totalChromaAcc += onlineScore.AvgChromaAccuracy;
            totalHueAcc += onlineScore.AvgHueAccuracy;
            totalRounds += onlineScore.NoOfRounds;
        }

        foreach (var onlineScore in localPlayerData.BestOnlineScores)
        {
            totalLightness += onlineScore.AvgLightnessAccuracy;
            totalChromaAcc += onlineScore.AvgChromaAccuracy;
            totalHueAcc += onlineScore.AvgHueAccuracy;
            totalRounds += onlineScore.NoOfRounds;
        }

        // finally, set the labels
        _playerNameText.text = GameManager.Instance.Backend.GetUsername();
        _lightnessAccuracyText.text = $"{totalLightness / totalRounds:F}";
        _hueAccuracyText.text = $"{totalHueAcc / totalRounds:F}";
        _chromaAccuracyText.text = $"{totalChromaAcc / totalRounds:F}";

        // and set the player rating, but after we get it from the backend
        // (god I LOVE async (I am LYING out of my teeth))
        GameManager.Instance.Backend.CalculateUserRating((dtr, rating) =>
        {
            if (dtr != Backend.DatabaseTransactionResult.Ok) return;
            _playerRatingText.text = $"{rating:F}";
        });
    }

    /// <summary>
    ///     function to show the play view
    /// </summary>
    private static void OnPlayButtonClicked()
    {
        GameManager.Instance.SetDisplayState(GameManager.DisplayState.GameView);
    }

    /// <summary>
    ///     function to show the leaderboard view
    /// </summary>
    private static void OnLeaderboardButtonClicked()
    {
        GameManager.Instance.SetDisplayState(GameManager.DisplayState.LeaderboardView);
    }

    /// <summary>
    ///     function to show the account view
    /// </summary>
    private static void OnAccountButtonClicked()
    {
        GameManager.Instance.SetDisplayState(GameManager.DisplayState.AccountView);
    }
}