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

namespace BrewMonster.Scripts.Chat
{
    /// <summary>
    /// Chat 输入/协议：wire（MarshalEditBoxText）↔ TMP &lt;sprite&gt; 显示。
    /// Chat input/protocol: wire (MarshalEditBoxText) ↔ TMP &lt;sprite&gt; display.
    /// </summary>
    public static class ChatWireTmpCodec
    {
        private static readonly Regex SpriteTagRegex = new Regex(@"<sprite\s[^>]*>", RegexOptions.IgnoreCase | RegexOptions.Compiled);

        /// <summary>
        /// Tạo một đoạn wire marshal cho một emotion (set:index) — gửi server đúng protocol.
        /// Build one marshaled wire segment for a single emotion (set:index) — correct server protocol.
        /// </summary>
        public static string BuildMarshaledEmotionWire(int emotionSet, int emotionIndex)
        {
            var item = new EditBoxItemBase(AUICommon.EditboxItemType.enumEIEmotion);
            item.SetName("W");
            item.SetInfo(AUICommon.MarshalEmotionInfo(emotionSet, emotionIndex));
            var items = new EditBoxItemsSet();
            char c = items.AppendItem(item);
            if (c == '\0')
                return "";

            string display = c.ToString();
            return AUICommon.MarshalEditBoxText(display, items);
        }

        /// <summary>
        /// TMP 正文（无频道前缀）→ wire marshal（用于发送）。
        /// TMP body text (no channel prefix) → marshaled wire (for sending).
        /// </summary>
        public static string TmpBodyToWire(string tmpBody, IEmotionSpriteMap map)
        {
            if (string.IsNullOrEmpty(tmpBody))
                return "";
            if (map == null)
                return tmpBody;

            var sb = new StringBuilder(tmpBody.Length);
            int last = 0;
            foreach (Match m in SpriteTagRegex.Matches(tmpBody))
            {
                sb.Append(tmpBody, last, m.Index - last);
                string tag = m.Value;
                if (TryMatchSpriteTagToEmotion(map, tag, out int es, out int ei))
                    sb.Append(BuildMarshaledEmotionWire(es, ei));
                else
                    sb.Append(tag);
                last = m.Index + m.Length;
            }

            sb.Append(tmpBody, last, tmpBody.Length - last);
            return sb.ToString();
        }

        /// <summary>
        /// Khớp tag với EmotionTMPTagBuilder — duyệt (set,index) đủ nhỏ.
        /// Match tag to EmotionTMPTagBuilder output — brute-force over (set,index) within reasonable bounds.
        /// </summary>
        public static bool TryMatchSpriteTagToEmotion(IEmotionSpriteMap map, string spriteTag, out int emotionSet, out int emotionIndex)
        {
            emotionSet = 0;
            emotionIndex = 0;
            if (map == null || string.IsNullOrEmpty(spriteTag))
                return false;

            string normalized = spriteTag.Trim();
            for (int s = 0; s < AUICommon.AUIMANAGER_MAX_EMOTIONGROUPS; s++)
            {
                for (int e = 0; e < 512; e++)
                {
                    if (!EmotionTMPTagBuilder.TryBuildEmotionTag(map, s, e, out string built))
                        continue;
                    if (built == normalized)
                    {
                        emotionSet = s;
                        emotionIndex = e;
                        return true;
                    }
                }
            }

            return false;
        }

        /// <summary>
        /// Wire → TMP 富文本（FilterEmotionSet + Unmarshal + ConvertInlineItemsToTmp）。
        /// Wire → TMP rich text (FilterEmotionSet + Unmarshal + ConvertInlineItemsToTmp).
        /// </summary>
        public static string WireBodyToTmpForDisplay(string wireBody, IEmotionSpriteMap map, int cEmotion)
        {
            return ChatEmotionDisplayPipeline.ConvertWireBodyToTmpDisplay(wireBody, map, cEmotion);
        }
    }
}