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

public class CardManager : MonoBehaviour
{
    public static CardManager Instance;

    [SerializeField] private List<GameObject> cardPrefabs;
    [SerializeField] private Transform cardsParent;

    private PlayerSkillTree playerSkillTree;
    private GameObject cards;


    private void Awake()
    {
        if (Instance == null)
        {
            Instance = this;
        }
        else
        {
            Destroy(gameObject);
        }
    }

    private void Start()
    {
        playerSkillTree = PlayerSkillTree.Instance;
        cards = GameObject.Find("Cards");
        cards.SetActive(false);
    }

    public void Update()
    {
        if (Input.GetKeyDown(KeyCode.V))
        {
            cards.SetActive(true);
            ShowRandomCards(3);
        }
    }

    public void ShowRandomCards(int count)
    {
        var unlockedSkills = playerSkillTree.GetPlayerSkills();

        // Projdeme všechny prefaby a zkontrolujeme jejich skill
        var availableCards = cardPrefabs
            .Select(x => x.GetComponent<CardUI>())
            .Where(x => x != null && !unlockedSkills.Contains(x.Skill))
            .ToList();


        // Vyčistíme staré karty
        foreach (Transform child in cardsParent)
        {
            Destroy(child.gameObject);
        }

        // Vybereme náhodné karty
        var shuffled = availableCards.OrderBy(x => UnityEngine.Random.value).Take(count).ToList();

        Debug.Log($"Showing cards: {string.Join(", ", shuffled.Select(x => x.Skill))}");
        Debug.Log($"Available cards: {string.Join(", ", availableCards.Select(x => x.Skill))}");
        Debug.Log($"Unlocked skills: {string.Join(", ", unlockedSkills)}");

        int xOffset = -800;
        if (availableCards.Count < 3)
        {
            xOffset = -400;
        }
        
        foreach (var cardUI in shuffled)
        {
            var newCard = Instantiate(cardUI.gameObject, cardsParent.position + new Vector3(xOffset, 0, 0), Quaternion.identity, cardsParent);
            xOffset += 800;
        }
    }

    public void SelectCard(PlayerSkillTree.Skills skill)
    {
        playerSkillTree.UnlockSkill(skill);

        foreach (Transform child in cardsParent)
        {
            var cardUI = child.GetComponent<CardUI>();
            if (cardUI.Skill == skill)
            {
                Destroy(child.gameObject);
            }
        }

        cards.SetActive(false);
    }
}