using System;
using System.Collections.Generic;
using UnityEngine;

public sealed class ScoringSystem : MonoBehaviour
{
    public event Action<YachtCategory, int> OnCategoryScored;
    public event Action<int> OnAllCategoriesScored;
    public event Action<YachtCategory, ScoreResult> OnCategoryConfirmed;

    private readonly Dictionary<YachtCategory, int> scorecard = new();
    private readonly HashSet<YachtCategory> usedCategories = new();
    private List<ModifierData> activeModifierData = new();

    public bool IsCategoryUsed(YachtCategory category) => usedCategories.Contains(category);

    public int GetCategoryScore(YachtCategory category)
    {
        return scorecard.TryGetValue(category, out int score) ? score : -1;
    }

    public int TotalScore
    {
        get
        {
            int total = 0;
            foreach (var kvp in scorecard) total += kvp.Value;
            return total;
        }
    }

    public int CategoriesFilledCount => usedCategories.Count;

    public int TotalCategoryCount => Enum.GetValues(typeof(YachtCategory)).Length;

    public bool IsComplete => CategoriesFilledCount >= TotalCategoryCount;

    public void SetActiveModifiers(List<ModifierData> modifiers)
    {
        activeModifierData = modifiers ?? new List<ModifierData>();
    }

    public IReadOnlyList<ModifierData> ActiveModifiers => activeModifierData;

    public ScoreResult PreviewScore(int[] diceValues, YachtCategory category)
    {
        int baseScore = CategoryScorer.Calculate(diceValues, category);
        ScoreResult result = ScoreResult.Create(baseScore, diceValues, category);

        ModifierPipeline.Apply(activeModifierData, ref result, ModifierScope.SelectedCategory);

        return result;
    }

    public ScoreResult ScoreCategory(int[] diceValues, YachtCategory category)
    {
        if (usedCategories.Contains(category))
            throw new InvalidOperationException($"Category {category} has already been scored.");

        int baseScore = CategoryScorer.Calculate(diceValues, category);
        ScoreResult result = ScoreResult.Create(baseScore, diceValues, category);

        ModifierPipeline.Apply(activeModifierData, ref result, ModifierScope.SelectedCategory);
        ModifierPipeline.Apply(activeModifierData, ref result, ModifierScope.AnyCategoryClosed);

        int finalScore = result.FinalScore;
        scorecard[category] = finalScore;
        usedCategories.Add(category);

        OnCategoryScored?.Invoke(category, finalScore);
        OnCategoryConfirmed?.Invoke(category, result);

        if (IsComplete)
            OnAllCategoriesScored?.Invoke(TotalScore);

        return result;
    }

    public void ResetScorecard()
    {
        scorecard.Clear();
        usedCategories.Clear();
    }
}