using System.Collections.Generic;
using Newtonsoft.Json.Linq;

namespace BarrageGrab.Modles.BiliProtoEntity
{
    /// <summary>
    /// B站直播弹幕WS协议操作码
    /// </summary>
    public enum BiliOperation
    {
        /// <summary>客户端心跳</summary>
        HEARTBEAT = 2,
        /// <summary>服务器心跳回复 (人气值)</summary>
        HEARTBEAT_REPLY = 3,
        /// <summary>普通消息 (弹幕/礼物/进房等)</summary>
        MESSAGE = 5,
        /// <summary>客户端认证请求</summary>
        AUTH = 7,
        /// <summary>服务器认证回复</summary>
        AUTH_REPLY = 8
    }

    /// <summary>
    /// B站WS协议版本 (影响Payload压缩方式)
    /// </summary>
    public enum BiliProtocolVersion
    {
        /// <summary>JSON明文</summary>
        PLAIN = 0,
        /// <summary>认证用JSON</summary>
        PLAIN_AUTH = 1,
        /// <summary>Zlib压缩 (内部可能含多个包)</summary>
        ZLIB = 2,
        /// <summary>Brotli压缩 (内部可能含多个包)</summary>
        BROTLI = 3
    }

    /// <summary>
    /// B站WS协议帧头 (16字节, Big-Endian)
    /// </summary>
    public struct BiliSocketFrame
    {
        /// <summary>整个包长度 (header+body)</summary>
        public uint PacketLength;
        /// <summary>头长度 (固定16)</summary>
        public ushort HeaderLength;
        /// <summary>协议版本</summary>
        public BiliProtocolVersion ProtocolVersion;
        /// <summary>操作码</summary>
        public BiliOperation Operation;
        /// <summary>序列号 (固定1)</summary>
        public uint SequenceId;

        public const int HEADER_SIZE = 16;

        /// <summary>从字节缓冲区解析帧头</summary>
        public static bool TryParse(byte[] buffer, int offset, int count, out BiliSocketFrame frame)
        {
            frame = default(BiliSocketFrame);
            if (buffer == null || count < HEADER_SIZE) return false;
            // Big-Endian 解析
            frame.PacketLength = ReadUInt32BE(buffer, offset);
            frame.HeaderLength = ReadUInt16BE(buffer, offset + 4);
            frame.ProtocolVersion = (BiliProtocolVersion)ReadUInt16BE(buffer, offset + 6);
            frame.Operation = (BiliOperation)ReadUInt32BE(buffer, offset + 8);
            frame.SequenceId = ReadUInt32BE(buffer, offset + 12);
            return frame.HeaderLength >= HEADER_SIZE && frame.PacketLength >= HEADER_SIZE;
        }

        /// <summary>帧体数据 (从 HeaderLength 开始到 PacketLength)</summary>
        public static byte[] GetPayload(byte[] buffer, int offset, BiliSocketFrame frame)
        {
            int bodyLen = (int)frame.PacketLength - frame.HeaderLength;
            if (bodyLen <= 0) return new byte[0];
            var data = new byte[bodyLen];
            System.Array.Copy(buffer, offset + frame.HeaderLength, data, 0, bodyLen);
            return data;
        }

        public static uint ReadUInt32BE(byte[] buf, int off)
        {
            return (uint)((buf[off] << 24) | (buf[off + 1] << 16) | (buf[off + 2] << 8) | buf[off + 3]);
        }

        public static ushort ReadUInt16BE(byte[] buf, int off)
        {
            return (ushort)((buf[off] << 8) | buf[off + 1]);
        }
    }

    /// <summary>
    /// B站弹幕消息 (cmd字段用于路由)
    /// </summary>
    public class BiliMessage
    {
        /// <summary>消息类型 (DANMU_MSG / SEND_GIFT / INTERACT_WORD 等)</summary>
        public string Cmd { get; set; }

        /// <summary>原始数据</summary>
        public JObject Raw { get; set; }
    }

    /// <summary>
    /// B站弹幕消息 cmd 列表 (用于识别已知类型)
    /// </summary>
    public static class BiliCmd
    {
        public const string DANMU_MSG = "DANMU_MSG";
        public const string SEND_GIFT = "SEND_GIFT";
        public const string INTERACT_WORD = "INTERACT_WORD";
        public const string LIKE_INFO_V3_CLICK = "LIKE_INFO_V3_CLICK";
        public const string ONLINE_RANK_COUNT = "ONLINE_RANK_COUNT";
        public const string WATCHED_CHANGE = "WATCHED_CHANGE";
        public const string LIVE = "LIVE";
        public const string PREPARING = "PREPARING";
        public const string ROOM_REAL_TIME_MESSAGE_UPDATE = "ROOM_REAL_TIME_MESSAGE_UPDATE";
        public const string SUPER_CHAT_MESSAGE = "SUPER_CHAT_MESSAGE";
    }

    /// <summary>
    /// B站弹幕消息(DANMU_MSG)简化结构
    /// </summary>
    public class BiliDanmuMsg
    {
        /// <summary>弹幕内容 (info[1])</summary>
        public string Content { get; set; }
        /// <summary>用户UID (info[2][0])</summary>
        public long Uid { get; set; }
        /// <summary>用户昵称 (info[2][1])</summary>
        public string Uname { get; set; }
        /// <summary>管理员? (info[2][2]==1)</summary>
        public bool IsAdmin { get; set; }
        /// <summary>主播? (info[2][4]存在)</summary>
        public bool IsAnchor { get; set; }
    }

    /// <summary>
    /// B站礼物消息(SEND_GIFT.data)简化结构
    /// </summary>
    public class BiliGiftData
    {
        public long Uid { get; set; }
        public string Uname { get; set; }
        public string Face { get; set; }
        public uint GiftId { get; set; }
        public string GiftName { get; set; }
        /// <summary>礼物数量</summary>
        public uint Num { get; set; }
        /// <summary>本批次礼物数 (连击时为本次增量)</summary>
        public uint ComboNum { get; set; }
        /// <summary>礼物连击总数</summary>
        public uint SuperBatchNum { get; set; }
        /// <summary>价格 (1 = 1000金瓜子)</summary>
        public long Price { get; set; }
        /// <summary>金币类型 gold=付费 silver=免费</summary>
        public string CoinType { get; set; }
        /// <summary>礼物图片</summary>
        public string GifUrl { get; set; }
    }

    /// <summary>
    /// B站进房/关注消息(INTERACT_WORD.data)简化结构
    /// </summary>
    public class BiliInteractData
    {
        public long Uid { get; set; }
        public string Uname { get; set; }
        /// <summary>1=进入 2=关注 3=分享</summary>
        public int MsgType { get; set; }
    }

    /// <summary>
    /// B站点赞消息(LIKE_INFO_V3_CLICK.data)简化结构
    /// </summary>
    public class BiliLikeData
    {
        public long Uid { get; set; }
        public string Uname { get; set; }
        public string LikeText { get; set; }
    }

    /// <summary>
    /// B站房间统计(ONLINE_RANK_COUNT.data / ROOM_REAL_TIME_MESSAGE_UPDATE.data)简化结构
    /// </summary>
    public class BiliRoomStats
    {
        /// <summary>在线人数</summary>
        public long Online { get; set; }
        /// <summary>看过人数</summary>
        public long Watched { get; set; }
    }
}