using UnityEngine;
using TMPro;
using UnityEngine.EventSystems;
using BrewMonster.Scripts.Task.UI;
using System.Collections.Generic;
using BrewMonster.UI;
using System.Text;
using System.Text.RegularExpressions;
namespace BrewMonster
{
    public class StyledTaskTraceText : MonoBehaviour, IPointerClickHandler
    {

        public TMP_Text tmp;
        private List<LinkCommand> linkCommands =new List<LinkCommand>();

        private void Start()
        {
            tmp.raycastTarget = true;
            tmp.ForceMeshUpdate();
        }

        // Helper method to find intersecting link with proper camera handling // 辅助方法，用于查找相交的链接并正确处理相机
        private int FindIntersectingLink(PointerEventData eventData)
        {
            if (tmp == null) return -1;

            tmp.ForceMeshUpdate();

            // Get camera for link detection // 获取用于链接检测的相机
            Camera camera = null;
            Canvas canvas = tmp.GetComponentInParent<Canvas>();
            if (canvas != null)
            {
                // IMPORTANT: TMP_TextUtilities.FindIntersectingLink expects camera=null for ScreenSpaceOverlay.
                // 重要：ScreenSpaceOverlay 必须传 camera=null，否则会算错导致 linkIndex = -1。
                if (canvas.renderMode == RenderMode.ScreenSpaceOverlay)
                {
                    camera = null;
                }
                else
                {
                    // ScreenSpaceCamera / WorldSpace
                    camera = eventData.pressEventCamera != null ? eventData.pressEventCamera : canvas.worldCamera;
                }
            }
            else
            {
                // No canvas found; fall back to pressEventCamera (may be null) then main
                camera = eventData.pressEventCamera != null ? eventData.pressEventCamera : Camera.main;
            }

            // Try with camera first, then fallback to null // 先尝试使用相机，然后回退到null
            int linkIndexCam = TMP_TextUtilities.FindIntersectingLink(tmp, eventData.position, camera);
            int linkIndexNull = TMP_TextUtilities.FindIntersectingLink(tmp, eventData.position, null);
            
            return linkIndexCam != -1 ? linkIndexCam : linkIndexNull;
        }
        public void Set(string text)
        {
            tmp.text = FormatForTextMeshPro(text);
        }
         public static string FormatForTextMeshPro(string text)
        {
            if (string.IsNullOrEmpty(text))
                return string.Empty;

            StringBuilder result = new StringBuilder(text);
            result.Replace("\\r", "\n");
            return ProcessColorCodes(result);
        }

        public static string ProcessColorCodes(StringBuilder text)
        {
            string pattern = @"\^([0-9A-Fa-f]{6})";
            return Regex.Replace(text.ToString(), pattern, match =>
            {
                string hexColor = match.Groups[1].Value;
                return $"<color=#{hexColor}>";
            }, RegexOptions.None);
        }
        
        public void AddToFirstPosition(LinkCommand linkCommand)
        {
            linkCommands.Insert(0, linkCommand);
        }
        public void AddToLastPosition(LinkCommand linkCommand)
        {
            linkCommands.Add(linkCommand);
        }
        public void AddLinkCommand(LinkCommand linkCommand)
        {
            linkCommands.Add(linkCommand);
        }
        public void RemoveLinkCommand(int linkIndex)
        {
            linkCommands.RemoveAt(linkIndex);
        }
        public void RefreshLinkCommands()
        {
            tmp.text = "";
            linkCommands.Clear();
        }

        public void OnPointerClick(PointerEventData eventData)
        {
            if (tmp == null) return;

            // Detect link directly in click handler // 在点击处理程序中直接检测链接
            int linkIndex = FindIntersectingLink(eventData);

            // Validate link index // 验证链接索引
            if (linkIndex == -1 || linkIndex >= tmp.textInfo.linkCount || linkIndex >= linkCommands.Count)
            {
                return;
            }

            tmp.ForceMeshUpdate();
            TMP_LinkInfo linkInfo = tmp.textInfo.linkInfo[linkIndex];
            string linkText = linkInfo.GetLinkText();
            string entityID = linkInfo.GetLinkID();
            
            switch (entityID)
            {
                case "coord":    
                    if (linkIndex < linkCommands.Count && linkCommands[linkIndex] != null)
                    {
                        linkCommands[linkIndex].Execute(tmp);
                    }
                    //Debug.Log($"[StyledTaskTraceText] OnPointerClick: linkCommands[{linkIndex}].Execute(tmp) => {linkCommands[linkIndex].Execute(tmp)}");
                    break;
                case "npc":
                    if (linkIndex < linkCommands.Count && linkCommands[linkIndex] != null)
                    {
                        linkCommands[linkIndex].Execute(tmp);
                    }
                    break;
                case "monster":
                    break;
                default:
                    Debug.Log($"Clicked unknown link: ID={entityID} Text={linkText}");
                    break;
            }
        }

    }

}