using Kryz.CharacterStats.Examples;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[System.Serializable]
public class WeightedDrop
{
    public Item drop;
    public float weight;
    public DifficultyLevels lowestPossibleDifficulty;
    public DifficultyLevels highestPossibleDifficulty;
    public int LowestDifficultyDrop => (int)lowestPossibleDifficulty;
    public int HighestDifficultyDrop => (int)highestPossibleDifficulty;

    public WeightedDrop(Item item, float weight)
    {
        this.drop = item;
        this.weight = weight;
        lowestPossibleDifficulty = DifficultyLevels.E;
        highestPossibleDifficulty = DifficultyLevels.SS;
    }

    public WeightedDrop(Item item, float weight, DifficultyLevels lowestPossibleDifficulty, DifficultyLevels highestPossibleDifficulty)
    {
        this.drop = item;
        this.weight = weight;
        this.lowestPossibleDifficulty = lowestPossibleDifficulty;
        this.highestPossibleDifficulty = highestPossibleDifficulty;
    }

    public static bool HaveDropsForDifficulty(List<WeightedDrop> table, int difficulty)
    {
        for (int i = 0; i < table.Count; i++)
        {
            if (table[i].LowestDifficultyDrop <= difficulty && table[i].HighestDifficultyDrop >= difficulty)
                return true;
        }
        return false;
    }
    public static bool HaveDropsForDifficulty(List<WeightedDrop> table, DifficultyLevels difficulty)
    {
        for (int i = 0; i < table.Count; i++)
        {
            if (table[i].lowestPossibleDifficulty <= difficulty && table[i].highestPossibleDifficulty >= difficulty)
                return true;
        }
        return false;
    }

    public static Item GetRandomDrop(List<WeightedDrop> items)
    {
        float totalWeight = 0;
        foreach (var weightedItem in items)
        {
            totalWeight += weightedItem.weight;
        }

        float randomValue = UnityEngine.Random.Range(0f, totalWeight);
        float currentWeight = 0;

        foreach (var weightedItem in items)
        {
            currentWeight += weightedItem.weight;
            if (randomValue <= currentWeight)
            {
                return weightedItem.drop;
            }
        }

        // This should never happen if the weights are set up correctly
        Debug.LogWarning("No item selected in weighted drop system. Returning default value.");
        return null;
    }

    public static Item GetRandomDrop(List<WeightedDrop> items, DifficultyLevels currentDifficulty)
    {
        float totalWeight = 0;
        // First pass: calculate total weight only for items within difficulty range
        foreach (var weightedItem in items)
        {
            if (weightedItem.lowestPossibleDifficulty <= currentDifficulty &&
                weightedItem.highestPossibleDifficulty >= currentDifficulty)
            {
                totalWeight += weightedItem.weight;
            }
        }

        if (totalWeight <= 0)
        {
            Debug.LogWarning($"No items available for difficulty level {currentDifficulty}. Returning null.");
            return null;
        }

        float randomValue = UnityEngine.Random.Range(0f, totalWeight);
        float currentWeight = 0;

        // Second pass: select item only from those within difficulty range
        foreach (var weightedItem in items)
        {
            if (weightedItem.lowestPossibleDifficulty <= currentDifficulty &&
                weightedItem.highestPossibleDifficulty >= currentDifficulty)
            {
                currentWeight += weightedItem.weight;
                if (randomValue <= currentWeight)
                {
                    return weightedItem.drop;
                }
            }
        }

        Debug.LogWarning("No item selected in weighted drop system. Returning null.");
        return null;
    }

    public static Item GetRandomDrop(List<WeightedDrop> items, int currentDifficulty)
    {
        float totalWeight = 0;
        // First pass: calculate total weight only for items within difficulty range
        foreach (var weightedItem in items)
        {
            if (weightedItem.LowestDifficultyDrop <= currentDifficulty &&
                weightedItem.HighestDifficultyDrop >= currentDifficulty)
            {
                totalWeight += weightedItem.weight;
            }
        }

        if (totalWeight <= 0)
        {
            Debug.LogWarning($"No items available for difficulty level {currentDifficulty}. Returning null.");
            return null;
        }

        float randomValue = UnityEngine.Random.Range(0f, totalWeight);
        float currentWeight = 0;

        // Second pass: select item only from those within difficulty range
        foreach (var weightedItem in items)
        {
            if (weightedItem.LowestDifficultyDrop <= currentDifficulty &&
                weightedItem.HighestDifficultyDrop >= currentDifficulty)
            {
                currentWeight += weightedItem.weight;
                if (randomValue <= currentWeight)
                {
                    return weightedItem.drop;
                }
            }
        }

        Debug.LogWarning("No item selected in weighted drop system. Returning null.");
        return null;
    }
}