using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.Events;

[Serializable]
public class DuckStickerEvent : UnityEvent<DuckStickerData>
{
}

public class DuckStickerManager : MonoBehaviour
{
    public List<DuckStickerData> duckStickers;

    public DuckStickerEvent stickerCollected;
    
    private readonly Dictionary<DuckStickerData, int> _collectedStickers = new Dictionary<DuckStickerData, int>();
    
    private static DuckStickerManager _instance;
    public static DuckStickerManager Instance
    {
        get { return _instance;  }
        private set { _instance = value; }
    }

    public IEnumerable<DuckStickerData> CollectedStickers
    {
        get { return duckStickers.Where(d => GetStickerCollectedCount(d) > 0); }
    }

    public DuckStickerManager()
    {
        Instance = this;
    }

    private void Awake()
    {
        CheckDuckStickers();
        foreach (var sticker in duckStickers)
        {
            _collectedStickers.Add(sticker, PlayerPrefs.GetInt("sticker." + sticker.Id));
        }
    }
    
    private void CheckDuckStickers()
    {
        var duckIds = new HashSet<string>();
        foreach (var duck in duckStickers)
        {
            if (duckIds.Contains(duck.Id))
            {
                Debug.LogError("Duplicate duck ID: '" + duck.Id + "' for duck '" + duck.name + "'");
            }

            duckIds.Add(duck.Id);
        }
    }

    public void OnStickerCollected(DuckStickerData sticker)
    {
        _collectedStickers[sticker]++;
        PlayerPrefs.SetInt("sticker." + sticker.Id, _collectedStickers[sticker]);
        
        stickerCollected.Invoke(sticker);
    }

    public int GetStickerCollectedCount(DuckStickerData sticker)
    {
        return _collectedStickers.ContainsKey(sticker) ? _collectedStickers[sticker] : 0;
    }
}