using System.Collections;
using UnityEngine;
using UnityEngine.UI;

namespace Streamingle.Contents.BossRaid
{
    /// <summary>
    /// 유저 피격 시 빨간 비네트 오버레이 + NiloToon 색상 플래시.
    /// </summary>
    public class PlayerHitEffect : MonoBehaviour
    {
        #region Fields

        // PlayerData에서 값을 읽되, 없으면 기본값 사용
        private Color vignetteColor = new Color(1f, 0f, 0f, 0.4f);
        private float vignetteDuration = 0.4f;
        private Color hitTintColor = new Color(1f, 0.3f, 0.3f);
        private float tintDuration = 0.3f;

        private Canvas _canvas;
        private Image _vignetteImage;
        private Coroutine _vignetteCoroutine;
        private Coroutine _tintCoroutine;
        private PlayerController _player;

        #endregion

        #region Unity Messages

        private void Awake()
        {
            CreateVignetteUI();
        }

        #endregion

        #region Public Methods

        public void Play(PlayerController player)
        {
            _player = player;

            // PlayerData에서 값 읽기
            if (player?.Data != null)
            {
                vignetteColor = player.Data.vignetteColor;
                vignetteDuration = player.Data.vignetteDuration;
                hitTintColor = player.Data.hitTintColor;
                tintDuration = player.Data.hitTintDuration;
            }

            if (_vignetteCoroutine != null) StopCoroutine(_vignetteCoroutine);
            _vignetteCoroutine = StartCoroutine(VignetteCoroutine());

            if (_tintCoroutine != null) StopCoroutine(_tintCoroutine);
            _tintCoroutine = StartCoroutine(TintCoroutine());
        }

        #endregion

        #region Private Methods

        private IEnumerator VignetteCoroutine()
        {
            _vignetteImage.color = vignetteColor;

            float elapsed = 0f;
            while (elapsed < vignetteDuration)
            {
                elapsed += Time.deltaTime;
                float t = elapsed / vignetteDuration;
                var c = vignetteColor;
                c.a = vignetteColor.a * (1f - t);
                _vignetteImage.color = c;
                yield return null;
            }

            _vignetteImage.color = Color.clear;
            _vignetteCoroutine = null;
        }

        private IEnumerator TintCoroutine()
        {
            if (_player == null) yield break;

            _player.FlashHitColor(hitTintColor);

            yield return new WaitForSeconds(tintDuration * 0.3f);

            // 부드럽게 원래 색상으로
            float elapsed = 0f;
            float fadeDur = tintDuration * 0.7f;
            while (elapsed < fadeDur)
            {
                elapsed += Time.deltaTime;
                float t = elapsed / fadeDur;
                Color c = Color.Lerp(hitTintColor, Color.white, t);
                _player.FlashHitColor(c);
                yield return null;
            }

            _player.RestoreColor();
            _tintCoroutine = null;
        }

        private void CreateVignetteUI()
        {
            var canvasObj = new GameObject("BossRaid_PlayerVignette");
            canvasObj.transform.SetParent(transform);
            _canvas = canvasObj.AddComponent<Canvas>();
            _canvas.renderMode = RenderMode.ScreenSpaceOverlay;
            _canvas.sortingOrder = 997;

            _vignetteImage = canvasObj.AddComponent<Image>();
            _vignetteImage.color = Color.clear;
            _vignetteImage.raycastTarget = false;
        }

        #endregion
    }
}