using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.UI;
/// <summary>
/// Shared abstract class for the minigameControllers
/// </summary>
public abstract class AbstractMinigameController : AbstractFeedback
{
    [Header("AbstractVariables")]
    /// <summary>
    /// We keep the minigamelist so that the minigame-index doesn't get reset
    /// DO NOT REMOVE
    /// </summary>
    public MinigameList minigamelist;

    /// <summary>
    /// A bool to denote whether or not the game is still being played
    /// </summary>
    protected bool gameIsActive;

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

    /// <summary>
    /// Reference to the current user
    /// </summary>
    private User user;

    /// <summary>
    /// Reference to the minigame ScriptableObject
    /// </summary>
    protected Minigame minigame;

    /// <summary>
    /// Each minigame has a webcamTexture, this will be used in children-methods
    /// </summary>
    public RawImage webcamScreen;

    /// <summary>
    /// Reference to the gameEnded panel, so we can update its display
    /// </summary>
    public GameObject gameEndedPanel;

    /// <summary>
    /// The theme that will be used by the signpredictor, this needs to be passed from the concrete class.
    /// This theme CAN be different from the theme that words are fetched from (Think SpellingBee and Hangman)
    /// </summary>
    protected abstract Theme signPredictorTheme
    {
        get;
    }

    /// <summary>
    /// Start is called before the first frame update, seal it to prevent minigames from changing it
    /// </summary>
    protected void Start()
    {
        // Get the scriptable of the current minigame
        minigame = minigamelist.minigames[minigamelist.currentMinigameIndex];

        // Start the game-specific start-logic
        StartController();

        // Prepare the signPredictor
        signPredictor.SetModel(signPredictorTheme.modelIndex);
        signPredictor.SwapScreen(webcamScreen);
        signPredictor.SetSignsList(GetSignsList());
        AddSelfAsListener();
    }

    /// <summary>
    /// All minigames use the same principle, they grab the most probable sign and use said sign to show feedback to the user
    /// Because we don't want minigames to write their own UpdateFeedbacks this function will be sealed
    /// </summary>
    /// <returns></returns>
    /// <exception cref="System.NotImplementedException"></exception>
    protected override sealed IEnumerator UpdateFeedback()
    {
        // Get the predicted sign
        if (signPredictor != null && signPredictor.learnableProbabilities != null && gameIsActive)
        {
            // Get highest predicted sign
            string predictedSign = signPredictor.learnableProbabilities.Aggregate((a, b) => a.Value < b.Value ? a : b).Key;
            float distance = signPredictor.learnableProbabilities[predictedSign];

            ProcessMostProbableSign(distance, predictedSign);
        }

        // This part is the only reason that feedbackProgress is needed in the abstract
        else if (feedbackProgress != null)
        {

            feedbackProgress.value = 0.0f;
        }

        yield return null;
    }

    /// <summary>
    /// Each game keeps a score, this score needs to be saved at some point
    /// </summary>
    public void SaveScores()
    {
        // Calculate new score
        int newScore = CalculateScore();

        // Save the score as a tuple: < int score, string time ago>
        Score score = new Score();
        score.scoreValue = newScore;
        score.time = DateTime.Now.ToString();

        // Save the new score
        var progress = user.GetMinigameProgress(minigame.index);

        // Get the current list of scores
        List<Score> latestScores = progress.latestScores;
        List<Score> highestScores = progress.highestScores;

        // Add the new score
        latestScores.Add(score);
        highestScores.Add(score);

        // Sort the scores
        highestScores.Sort((a, b) => b.scoreValue.CompareTo(a.scoreValue));

        // Only save the top 10 scores, so this list doesn't keep growing endlessly
        progress.latestScores = latestScores.Take(10).ToList();
        progress.highestScores = highestScores.Take(10).ToList();

        PersistentDataController.GetInstance().Save();
    }
    /// <summary>
    /// The function that activates when the game ends, handles some endgame logic and displays the EndPanel
    /// </summary>
    /// <param name="won"></param>
    public void ActivateEnd(bool victory)
    {
        EndGameLogic(victory);
        SaveScores();
        SetScoreBoard(victory);

        gameEndedPanel.SetActive(true);
    }

    /// <summary>
    /// Once the most probable sign has been fetched, they can be processed
    /// </summary>
    /// <param name="accuracy">The accuracy of the passed sign</param>
    /// <param name="predictedSign">The name of the passed sign</param>
    protected abstract void ProcessMostProbableSign(float accuracy, string predictedSign);

    /// <summary>
    /// Each minigame has their own way of calculating their score
    /// </summary>
    /// <returns>The score that the user has at that point</returns>
    public abstract int CalculateScore();

    /// <summary>
    /// Each minigame has an AbstractGameEndedPanel at the end, but they each have their own unique concrete instance
    /// </summary>
    /// <param name="victory">1 if the player won, 0 if they lost. Some games need this</param>
    protected abstract void SetScoreBoard(bool victory);

    /// <summary>
    /// Each minigame puts their GameLogic to be called at (re)start in a seperate function from Start()
    /// </summary>
    public void StartController()
    {
        StartGameLogic();

        // Create entry in current user for keeping track of progress
        user = UserList.GetCurrentUser();
        var progress = user.GetMinigameProgress(minigame.index);
        if (progress == null)
        {
            progress = new PersistentDataController.SavedMinigameProgress();
            progress.minigameIndex = minigame.index;
            user.AddMinigameProgress(progress);
        }
        UserList.Save();
    }

    /// <summary>
    /// Logic to be called at the start of the game
    /// </summary>
    protected abstract void StartGameLogic();

    /// <summary>
    /// Function that contains all the logic to end the game
    /// </summary>
    /// <param name="victory">1 if the player won, 0 if they lost. Some games need this</param>
    protected abstract void EndGameLogic(bool victory);

    /// <summary>
    /// All non-fingerspelling-minigames have the same logic for the GetSignsList
    /// </summary>
    /// <returns>The signsList that needs to be passed to the signPredictor</returns>
    private List<string> GetSignsList()
    {
        List<string> signsList = new List<string>();
        foreach (Learnable learnable in signPredictorTheme.learnables)
        {
            signsList.Add(learnable.name.ToUpper().Replace(" ", "-")); ;
        }

        return signsList;
    }
}