using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

namespace AibisDream.MiniGame.Language
{
    /// <summary>
    /// 分析模式解码器条纹组件（可拖拽）
    /// </summary>
    public class AnalysisDecoderStrip : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
    {
        [Header("组件")]
        [SerializeField] private RectTransform rectTransform;
        [SerializeField] private CanvasGroup canvasGroup;
        [SerializeField] private Image backgroundImage;

        [Header("拖拽配置")]
        [SerializeField] private bool isDraggable = true;
        [SerializeField] private float dragAlpha = 0.7f;

        [Header("样式配置")]
        [SerializeField] private Color stripColor = new Color(0f, 0.12f, 0.12f, 0.95f);
        [SerializeField] private Color borderColor = Color.cyan;
        [SerializeField] private float borderWidth = 2f;

        private Vector2 dragOffset;
        private RectTransform parentRectTransform;
        private float originalAlpha = 1f;

        private void Awake()
        {
            if (rectTransform == null)
            {
                rectTransform = GetComponent<RectTransform>();
            }

            if (canvasGroup == null)
            {
                canvasGroup = GetComponent<CanvasGroup>();
                if (canvasGroup == null)
                {
                    canvasGroup = gameObject.AddComponent<CanvasGroup>();
                }
            }

            if (backgroundImage == null)
            {
                backgroundImage = GetComponent<Image>();
            }

            // 设置样式
            if (backgroundImage != null)
            {
                backgroundImage.color = stripColor;
            }

            // 添加边框（使用 Outline 组件）
            Outline outline = GetComponent<Outline>();
            if (outline == null)
            {
                outline = gameObject.AddComponent<Outline>();
            }
            outline.effectColor = borderColor;
            outline.effectDistance = new Vector2(borderWidth, borderWidth);

            originalAlpha = canvasGroup.alpha;

            // 获取父容器
            if (transform.parent != null)
            {
                parentRectTransform = transform.parent.GetComponent<RectTransform>();
            }
        }

        public void OnBeginDrag(PointerEventData eventData)
        {
            if (!isDraggable) return;

            // 计算拖拽偏移
            RectTransformUtility.ScreenPointToLocalPointInRectangle(
                parentRectTransform ?? rectTransform,
                eventData.position,
                eventData.pressEventCamera,
                out Vector2 localPoint);

            dragOffset = rectTransform.anchoredPosition - localPoint;

            // 降低透明度
            if (canvasGroup != null)
            {
                canvasGroup.alpha = dragAlpha;
            }
        }

        public void OnDrag(PointerEventData eventData)
        {
            if (!isDraggable) return;

            // 更新位置
            if (RectTransformUtility.ScreenPointToLocalPointInRectangle(
                parentRectTransform ?? rectTransform,
                eventData.position,
                eventData.pressEventCamera,
                out Vector2 localPoint))
            {
                rectTransform.anchoredPosition = localPoint + dragOffset;
            }
        }

        public void OnEndDrag(PointerEventData eventData)
        {
            if (!isDraggable) return;

            // 恢复透明度
            if (canvasGroup != null)
            {
                canvasGroup.alpha = originalAlpha;
            }
        }

        /// <summary>
        /// 设置是否可拖拽
        /// </summary>
        public void SetDraggable(bool draggable)
        {
            isDraggable = draggable;
        }

        /// <summary>
        /// 获取当前位置（网格坐标）
        /// </summary>
        public Vector2Int GetGridPosition(float cellSize, float cellGap)
        {
            float unit = cellSize + cellGap;
            int col = Mathf.RoundToInt(rectTransform.anchoredPosition.x / unit);
            int row = Mathf.RoundToInt(-rectTransform.anchoredPosition.y / unit);
            return new Vector2Int(row, col);
        }

        /// <summary>
        /// 设置网格位置
        /// </summary>
        public void SetGridPosition(int row, int col, float cellSize, float cellGap)
        {
            float unit = cellSize + cellGap;
            float xPos = col * unit;
            float yPos = -row * unit;
            rectTransform.anchoredPosition = new Vector2(xPos, yPos);
        }
    }
}