using Cysharp.Threading.Tasks;
using DG.Tweening;
using System.Threading;
using System.Threading.Tasks;
using TMPro;
using UnityEngine;

namespace CharacterSystem
{
    public class MessageBox : MonoBehaviour
    {
        [SerializeField] private Transform _frame;
        [SerializeField] private Vector2 _localPos;
        [SerializeField] private TextMeshProUGUI nameLabel;
        [SerializeField] private TextMeshProUGUI textField;
        [SerializeField] private AudioSource _audioSource;
        [SerializeField] private AudioClip typeClip;
        private bool nowTyping;
        private CancellationTokenSource _cts;

        private float lastTypeSoundTime;
        private float typeClipLength;

        public void Initialize(string characterName)
        {
            nameLabel.text = characterName;
            _frame.position = _localPos;
            lastTypeSoundTime = 0;
            typeClipLength = typeClip != null ? typeClip.length : 0;
        }

        public async UniTask PlayReplica(Replica replica, bool force = false)
        {
            if (nowTyping && force == false) return;

            Stop();

            _cts = new();
            nowTyping = true;

            await GetShowSequence().WithCancellation(_cts.Token);
            await TypeAsync(replica, _cts.Token);
            await UniTask.Delay(1000, cancellationToken: _cts.Token);
            await GetHideSequence().WithCancellation(_cts.Token);

            Stop();
        }

        private async UniTask TypeAsync(Replica replica, CancellationToken ct)
        {
            string message = replica.text;

            if (replica.Duration == 0 || string.IsNullOrEmpty(message))
            {
                textField.text = message;
                return;
            }

            if (replica.clip != null)
            {
                _audioSource.clip = replica.clip;
                _audioSource.Play();
                SoundManager.instance.MusicFade(fadeDuration: 0.2f,
                                                holdDuration: replica.clip.length - 0.2f,
                                                targetVolumePercent: 0.5f);
            }

            float elapsed = 0;
            textField.text = string.Empty;

            while (elapsed < replica.Duration && ct.IsCancellationRequested == false)
            {
                float percent = Mathf.Clamp01(elapsed / replica.Duration);
                int symbolsToShow = (int)(message.Length * percent);
                string text = message.Substring(0, symbolsToShow);

                textField.text = text;

                bool shouldPlayClip = typeClipLength != 0 && Time.time - lastTypeSoundTime > typeClipLength;
                if (shouldPlayClip)
                {
                    _audioSource.PlayOneShot(typeClip);
                    lastTypeSoundTime = Time.time;
                }

                await UniTask.Yield(ct);
                elapsed += Time.deltaTime;
            }

            if (ct.IsCancellationRequested == false)
            {
                textField.text = message;
            }
        }

        public void Stop()
        {
            if (_cts != null)
            {
                _cts.Cancel();
                _cts.Dispose();
                _cts = null;
            }
            nowTyping = false;
            textField.text = string.Empty;
        }

        private Sequence GetShowSequence()
        {
            Sequence seq = DOTween.Sequence();
            seq.Append(_frame.DOScale(1, 0.2f).SetEase(Ease.OutBack));
            return seq;
        }

        private Sequence GetHideSequence()
        {
            Sequence seq = DOTween.Sequence();
            seq.Append(_frame.DOScale(0, 0.2f).SetEase(Ease.InBack));
            return seq;
        }
    }
}