using TMPro;
using UnityEngine;
using Cysharp.Threading.Tasks;
using System.Threading;
using UnityEngine.UI;

public class LetterSlot : MonoBehaviour
{
    [SerializeField] private TextMeshProUGUI _label;

    [Header("Анимация выбора")]
    [SerializeField] private float _normalScale = 1f;
    [SerializeField] private float _selectedScale = 1.1f;
    [SerializeField] private float _animationSpeed = 5f;

    [SerializeField] private Color normalColor;
    [SerializeField] private Color selectedColor;

    [SerializeField] private AnimationCurve _animationCurve;

    private char _symbol;
    private Color _cachedColor;
    private CancellationTokenSource _cts;

    public void Init(char symbol, bool selected)
    {
        SetSymbol(symbol);
        SetSelected(selected);
    }

    public void SetSelected(bool value)
    {
        _cts?.Cancel();
        _cts?.Dispose();
        _cts = new CancellationTokenSource();

        AnimAsync(selected: value, _cts.Token).Forget();
    }

    public char GetSymbol() => _symbol;

    public void SetSymbol(char symbol)
    {
        _symbol = symbol;
        UpdateLabel();
    }

    private void UpdateLabel() => _label.text = _symbol.ToString();

    private async UniTask AnimAsync(bool selected, CancellationToken token)
    {
        Color startColor = _label.color;
        float startScale = transform.localScale.x;

        Color targetColor = selected ? selectedColor : normalColor;
        float targetScale = selected ? _selectedScale : _normalScale;

        float t = 0;
        while (t < 1f && !token.IsCancellationRequested)
        {
            float t1 = _animationCurve.Evaluate(t);

            transform.localScale = Vector3.one * Mathf.Lerp(startScale, targetScale, t1);
            _label.color = Color.Lerp(startColor, targetColor, t1);

            t += Time.deltaTime * _animationSpeed;
            t = Mathf.Min(t, 1f);

            await UniTask.Yield(PlayerLoopTiming.Update, token);
        }

        transform.localScale = Vector3.one * targetScale;
        _label.color = targetColor;
    }

    private void OnDestroy()
    {
        _cts?.Cancel();
        _cts?.Dispose();
    }
}