using System.Text.RegularExpressions;
using CSNetwork;
using UnityEngine;

namespace BrewMonster.Scripts.Chat
{
    /// <summary>
    /// Chat 表情与内联富文本 — Emotion set + TMP conversion for chat (ported from CECGameUIMan::AddChatMessage).
    /// Keeps channel emotion filtering and Unmarshal/Convert-to-TMP in one place.
    /// </summary>
    public sealed class ChatEmotionDisplayPipeline
    {
        /// <summary>
        /// Khi thiếu ký tự PUA trước payload, Unmarshal không chạy nhưng vẫn còn &lt;0&gt;&lt;set:index&gt; (Serialize).
        /// When PUA prefix is missing, Unmarshal skips but &lt;0&gt;&lt;set:index&gt; (Serialize) may remain.
        /// </summary>
        private static readonly Regex LooseMarshaledEmotionRegex = new Regex(
            @"<0><(\d+):(\d+)>",
            RegexOptions.Compiled);

        private IEmotionSpriteMap _spriteMap = new StubEmotionSpriteMap();

        /// <summary>
        /// Wire 正文（服务器 / 输入缓冲）→ TMP 显示用富文本 — 与 CECGameUIMan.AddChatMessage 内转换一致（不含 FilterBadWords）。
        /// Wire body (server / input buffer) → TMP rich text for display — same as CECGameUIMan.AddChatMessage (without FilterBadWords).
        /// </summary>
        public static string ConvertWireBodyToTmpDisplay(string wireBody, IEmotionSpriteMap map, int cEmotion)
        {
            if (string.IsNullOrEmpty(wireBody))
                return "";
            if (map == null)
                return wireBody;

            var p = new ChatEmotionDisplayPipeline(map);
            string filtered = p.ApplyChannelEmotionFilter(wireBody, cEmotion);
            return p.ConvertInlineItemsToTmp(filtered);
        }

        public ChatEmotionDisplayPipeline(IEmotionSpriteMap spriteMap = null)
        {
            if (spriteMap != null)
                _spriteMap = spriteMap;
            else
                BMLogger.LogWarning("[ChatEmotionDisplayPipeline] spriteMap is null — using StubEmotionSpriteMap. Call SetSpriteMap() or assign EmotionLibrarySpriteMap SO on CECUIManager.");
        }

        public void SetSpriteMap(IEmotionSpriteMap spriteMap)
        {
            if (spriteMap == null)
                BMLogger.LogWarning("[ChatEmotionDisplayPipeline] SetSpriteMap() called with null — EmotionLibrarySpriteMap SO chưa được gán trên CECUIManager Inspector.");
            _spriteMap = spriteMap ?? new StubEmotionSpriteMap();
        }

        /// <summary>C++: FilterEmotionSet — map inline emotion codes to the correct set for this channel.</summary>
        public string ApplyChannelEmotionFilter(string pszMsg, int cEmotion)
        {
            return AUICommon.FilterEmotionSet(pszMsg, cEmotion);
        }

        /// <summary>
        /// TMP: Unmarshal edit-box item codes and convert emotion / coord / inventory links to TMP rich text.
        /// Call after <see cref="CECUIManager.FilterBadWords"/> when the message is from a player channel.
        /// </summary>
        public string ConvertInlineItemsToTmp(string pszMsgAfterBadWordFilter)
        {
            EditBoxItemsSet itemsSet = new EditBoxItemsSet();
            string displayText = AUICommon.UnmarshalEditBoxText(pszMsgAfterBadWordFilter, itemsSet);
            string tmpText;
            if (itemsSet.GetItemCount() <= 0)
                tmpText = pszMsgAfterBadWordFilter;
            else
            {
                tmpText = displayText;
                tmpText = AUICommon.ConvertEmotionsToTMP(tmpText, itemsSet, _spriteMap);
                tmpText = AUICommon.ConvertCoordsToTMP(tmpText, itemsSet);
                tmpText = AUICommon.ConvertIvtrItemsToTMP(tmpText, itemsSet);
                tmpText = AUICommon.StripRemainingItemCodes(tmpText);
            }

            return ReplaceLooseMarshaledEmotionTags(tmpText);
        }

        /// <summary>
        /// Fallback: wire emotion chỉ còn dạng Serialize &lt;0&gt;&lt;set:index&gt; (không qua PUA) → TMP &lt;sprite&gt;.
        /// Fallback: emotion wire as Serialize-only &lt;0&gt;&lt;set:index&gt; (no PUA) → TMP &lt;sprite&gt;.
        /// </summary>
        private string ReplaceLooseMarshaledEmotionTags(string text)
        {
            if (string.IsNullOrEmpty(text) || _spriteMap == null)
                return text;

            return LooseMarshaledEmotionRegex.Replace(text, match =>
            {
                int set = int.Parse(match.Groups[1].Value);
                int index = int.Parse(match.Groups[2].Value);
                if (_spriteMap.TryGetSprite(set, index, out EmotionSpriteInfo info))
                    return EmotionTMPTagBuilder.BuildSpriteTag(info);
                return match.Value;
            });
        }
    }
}