using UnityEngine;
using UnityEngine.UI;

namespace Streamingle.Contents.BossRaid
{
    /// <summary>
    /// 유저 HP바. 머리 위 월드스페이스 캔버스로 표시됩니다.
    /// </summary>
    public class PlayerHPBar : MonoBehaviour
    {
        #region Fields

        [Header("설정")]
        [SerializeField] private Vector3 offset = new Vector3(0f, 0.3f, 0f);
        [SerializeField] private float barWidth = 1.2f;
        [SerializeField] private float barHeight = 0.12f;
        [SerializeField] private float smoothSpeed = 8f;

        [Header("색상")]
        [SerializeField] private Color hpColor = new Color(0.2f, 0.85f, 0.3f);
        [SerializeField] private Color hpColorLow = new Color(0.95f, 0.2f, 0.15f);
        [SerializeField] private Color bgColor = new Color(0.1f, 0.1f, 0.1f, 0.85f);
        [SerializeField] private Color frameColor = new Color(0.3f, 0.3f, 0.35f);

        private Canvas _canvas;
        private Image _hpFill;
        private RectTransform _fillRect;
        private Transform _followTarget;
        private float _targetRatio = 1f;
        private float _displayRatio = 1f;
        private bool _isVisible;
        private Font _font;
        private Text _nameText;

        #endregion

        #region Unity Messages

        private void LateUpdate()
        {
            if (!_isVisible || _followTarget == null) return;

            // 머리 위 따라다님
            transform.position = _followTarget.position + offset;

            // 카메라를 향하도록
            if (Camera.main != null)
                _canvas.transform.rotation = Camera.main.transform.rotation;

            // 부드러운 HP 감소
            _displayRatio = Mathf.Lerp(_displayRatio, _targetRatio, Time.deltaTime * smoothSpeed);
            _fillRect.anchorMax = new Vector2(Mathf.Clamp01(_displayRatio), 1f);
            _hpFill.color = _displayRatio > 0.3f ? hpColor : hpColorLow;
        }

        #endregion

        #region Public Methods

        public void Initialize(Transform headTarget, string playerName = "", Vector3? customOffset = null)
        {
            _font = BossRaidFontLoader.Load();
            _followTarget = headTarget;
            if (customOffset.HasValue)
                offset = customOffset.Value;
            CreateUI();
            _isVisible = true;

            if (_nameText != null && !string.IsNullOrEmpty(playerName))
                _nameText.text = playerName;
        }

        public void SetHP(float ratio)
        {
            _targetRatio = Mathf.Clamp01(ratio);
        }

        public void Show()
        {
            _isVisible = true;
            if (_canvas != null) _canvas.gameObject.SetActive(true);
        }

        public void Hide()
        {
            _isVisible = false;
            if (_canvas != null) _canvas.gameObject.SetActive(false);
        }

        #endregion

        #region Private Methods

        private void CreateUI()
        {
            var canvasObj = new GameObject("PlayerHPBar_Canvas");
            canvasObj.transform.SetParent(transform);
            canvasObj.transform.localPosition = Vector3.zero;
            _canvas = canvasObj.AddComponent<Canvas>();
            _canvas.renderMode = RenderMode.WorldSpace;
            _canvas.sortingOrder = 90;

            var rt = canvasObj.GetComponent<RectTransform>();
            rt.sizeDelta = new Vector2(barWidth, barHeight + 0.15f);
            rt.localScale = Vector3.one;

            // 프레임
            var frameObj = new GameObject("Frame");
            frameObj.transform.SetParent(canvasObj.transform, false);
            var frameRect = frameObj.AddComponent<RectTransform>();
            frameRect.anchorMin = new Vector2(0f, 0f);
            frameRect.anchorMax = new Vector2(1f, 0.7f);
            frameRect.offsetMin = Vector2.zero;
            frameRect.offsetMax = Vector2.zero;
            var frameImg = frameObj.AddComponent<Image>();
            frameImg.color = frameColor;
            frameImg.raycastTarget = false;

            // 배경
            var bgObj = new GameObject("BG");
            bgObj.transform.SetParent(frameObj.transform, false);
            var bgRect = bgObj.AddComponent<RectTransform>();
            bgRect.anchorMin = Vector2.zero;
            bgRect.anchorMax = Vector2.one;
            bgRect.offsetMin = new Vector2(0.01f, 0.01f);
            bgRect.offsetMax = new Vector2(-0.01f, -0.01f);
            var bgImg = bgObj.AddComponent<Image>();
            bgImg.color = bgColor;
            bgImg.raycastTarget = false;

            // HP Fill
            var fillObj = new GameObject("Fill");
            fillObj.transform.SetParent(bgObj.transform, false);
            _fillRect = fillObj.AddComponent<RectTransform>();
            _fillRect.anchorMin = Vector2.zero;
            _fillRect.anchorMax = Vector2.one;
            _fillRect.offsetMin = Vector2.zero;
            _fillRect.offsetMax = Vector2.zero;
            _hpFill = fillObj.AddComponent<Image>();
            _hpFill.color = hpColor;
            _hpFill.raycastTarget = false;

            // 이름 텍스트 (바 위)
            var nameObj = new GameObject("Name");
            nameObj.transform.SetParent(canvasObj.transform, false);
            var nameRect = nameObj.AddComponent<RectTransform>();
            nameRect.anchorMin = new Vector2(0f, 0.7f);
            nameRect.anchorMax = Vector2.one;
            nameRect.offsetMin = Vector2.zero;
            nameRect.offsetMax = Vector2.zero;
            _nameText = nameObj.AddComponent<Text>();
            _nameText.text = "";
            _nameText.fontSize = 3;
            _nameText.color = Color.white;
            _nameText.alignment = TextAnchor.MiddleCenter;
            _nameText.raycastTarget = false;
            if (_font != null) _nameText.font = _font;

            var outline = nameObj.AddComponent<Outline>();
            outline.effectColor = Color.black;
            outline.effectDistance = new Vector2(0.3f, -0.3f);
        }

        #endregion
    }
}