using Ananta.SDK.Serialization;

namespace Ananta.Server.Protocol.Client4229938;

/// <summary>One parsed StoryClientCommand from the C2S story channel.</summary>
internal sealed record StoryClientCommand4229938(
    byte TypeMark,
    uint Nid,
    string Name,
    long RpcId,
    bool HasRpcId,
    string? PayloadKind,
    ulong? PayloadVehicleId,
    List<byte>? PayloadSeatIndices,
    bool? PayloadBool,
    long? PayloadInt,
    ulong? PayloadULong,
    // ★ S002 里希盘查（2026-10-01 从捐赠端 DRMK-PS_09_7k-v0.5-2 移植）：
    //   Police = 解出来的 S002 警用 payload；PayloadString = StringPayload(mark 42)。
    //   ⛑ 42 原来在本文件里**没有**，GATE Lua 回执曾经只能用 44（ULongPayload）。
    PoliceStoryPayload4229938? Police = null,
    string? PayloadString = null);

/// <summary>
/// S002 警用 payload（捐赠端同名 record 照搬）。
/// ⛑ Tag 是 **payload 的 mark**，不是 InteractionId：
///   19=EnterExamRequest / 20=EscortFromVehicleRequest / 21=EscortRequest /
///   18,22=带车 / 23=只带车 / 24=一次盘查选项（InteractionId + SectionId）。
/// </summary>
internal sealed record PoliceStoryPayload4229938(byte Tag, ulong AgentId = 0, bool StartInteract = false,
    uint InteractionId = 0, uint SectionId = 0, bool IsStandUp = false,
    ulong VehicleId = 0, int SeatIndex = -1, int[]? Fines = null);

/// <summary>
/// Parser for the 4229938 story channel (SyncStoryCoreClientInfo, 67130745):
/// an inline List7Bit of complex StoryClientCommand entries.
/// Command marks: ConfirmRpc 2, Message 4, SetObservable-shaped 5, reliable RpcId-only 3/6.
/// Payload marks: Bool 5, Byte 6, Int 12, S011EnterVehicleRequest 35 (NOT 36 — V2's value
/// is from another build; proven live 2026-09-12 on the sibling 08.05 build: hex
/// ...-23-<u64>-FF-<count>-<seats>), S011VehicleAndSeat 37, ULong 44. Shapes verified
/// against dump.cs (StoryClientCommand base, payload V fields,
/// S011EnterVehicleRequestPayload{VehicleId, SeatIndices}, S011VehicleAndSeatPayload).
/// An unknown command or payload aborts that message's parse; the prefix is still returned.
/// </summary>
internal static class StoryVehicleCodec4229938
{
    internal static IReadOnlyList<StoryClientCommand4229938> Parse(ReadOnlySpan<byte> body, out bool fullyConsumed)
    {
        var commands = new List<StoryClientCommand4229938>();
        var reader = new UxReader(body.ToArray());
        fullyConsumed = false;

        try
        {
            // Nullable list framing: 0x00 = null, 0xFF + Int7 count + items.
            if (reader.U8() == 0x00)
            {
                fullyConsumed = true;
                return commands;
            }

            int count = reader.Int7();
            for (int i = 0; i < count; i++)
            {
                byte mark = reader.U8();
                if (mark == 0x00)
                    continue;

                switch (mark)
                {
                    case 2: // ConfirmRpcCommand { ConfirmRpcId i64, RpcId i64, HasRpcId bool }
                    {
                        long confirmRpcId = reader.I64();
                        (long rpcId, bool hasRpcId) = ParseCommandBase(reader);
                        commands.Add(new StoryClientCommand4229938(2, 0, "ConfirmRpc", rpcId, hasRpcId, "Confirm", (ulong)confirmRpcId, null, null, null, null));
                        break;
                    }

                    case 4: // MessageCommand { Nid u32, Name string, Value StoryNetPayload, RpcId, HasRpcId }
                    {
                        uint nid = reader.U32();
                        string name = reader.UxStringNullable() ?? string.Empty;
                        var payload = ParsePayload(reader);
                        (long rpcId, bool hasRpcId) = ParseCommandBase(reader);
                        commands.Add(new StoryClientCommand4229938(4, nid, name, rpcId, hasRpcId,
                            payload.Kind, payload.VehicleId, payload.SeatIndices, payload.Bool, payload.Int, payload.ULong,
                            payload.Police, payload.Text));
                        break;
                    }

                    case 5: // { Nid u32, Name string, Value StoryNetPayload, RpcId, HasRpcId }
                    {
                        uint nid = reader.U32();
                        string name = reader.UxStringNullable() ?? string.Empty;
                        var payload = ParsePayload(reader);
                        (long rpcId, bool hasRpcId) = ParseCommandBase(reader);
                        commands.Add(new StoryClientCommand4229938(5, nid, name, rpcId, hasRpcId,
                            payload.Kind, payload.VehicleId, payload.SeatIndices, payload.Bool, payload.Int, payload.ULong,
                            payload.Police, payload.Text));
                        break;
                    }

                    case 3:
                    case 6: // { RpcId i64, HasRpcId bool }
                    {
                        (long rpcId, bool hasRpcId) = ParseCommandBase(reader);
                        commands.Add(new StoryClientCommand4229938(mark, 0, mark == 3 ? "Rpc3" : "Rpc6", rpcId, hasRpcId, null, null, null, null, null, null));
                        break;
                    }

                    default:
                        return commands;
                }
            }

            fullyConsumed = true;
            return commands;
        }
        catch (Exception)
        {
            return commands;
        }
    }

    private static (long RpcId, bool HasRpcId) ParseCommandBase(UxReader reader)
        => (reader.I64(), reader.Bool());

    private static (string Kind, ulong? VehicleId, List<byte>? SeatIndices, bool? Bool, long? Int, ulong? ULong,
        PoliceStoryPayload4229938? Police, string? Text) ParsePayload(UxReader reader)
    {
        byte mark = reader.U8();
        switch (mark)
        {
            case 5: // BoolPayload { V bool }
                return ("Bool", null, null, reader.Bool(), null, null, null, null);
            case 6: // BytePayload { V byte } - S011 boarding phases arrive in this shape
                return ("Byte", null, null, null, reader.U8(), null, null, null);
            case 12: // IntPayload { V i32 }
                return ("Int", null, null, null, reader.I32(), null, null, null);
            case 44: // ULongPayload { V u64 }
                return ("ULong", null, null, null, null, reader.U64(), null, null);
            // ---- S002 里希盘查（移植自捐赠端）----
            case 42: // StringPayload { V string }
                return ("String", null, null, null, null, null, null, reader.UxStringNullable());
            case 43: // UIntPayload { V u32 }
                return ("UInt", null, null, null, reader.U32(), null, null, null);
            case 19: // S002EnterExamRequestPayload { AgentId u64, StartInteract bool }
                return ("S002", null, null, null, null, null,
                    new PoliceStoryPayload4229938(mark, AgentId: reader.U64(), StartInteract: reader.Bool()), null);
            case 20: // S002EscortFromVehicleRequestPayload { AgentId u64 }
            case 21: // S002EscortRequestPayload { AgentId u64 }
                return ("S002", null, null, null, null, null,
                    new PoliceStoryPayload4229938(mark, AgentId: reader.U64()), null);
            case 18:
            case 22: // { AgentId u64, VehicleId u64 }
                return ("S002", null, null, null, null, null,
                    new PoliceStoryPayload4229938(mark, AgentId: reader.U64(), VehicleId: reader.U64()), null);
            case 23: // { VehicleId u64 }
                return ("S002", null, null, null, null, null,
                    new PoliceStoryPayload4229938(mark, VehicleId: reader.U64()), null);
            case 24: // S002ExamInteractPayload { InteractionId u32, SectionId u32, IsStandUp bool, params }
            {
                uint interaction = reader.U32(), section = reader.U32();
                bool stand = reader.Bool();
                byte param = reader.U8();
                ulong vehicle = 0; int seat = -1; int[]? fines = null;
                if (param == 2) { vehicle = reader.U64(); seat = reader.I32(); }
                else if (param == 3 && reader.U8() != 0)
                {
                    int count = reader.Int7();
                    if (count < 0 || count > 64) throw new InvalidDataException("invalid fine count");
                    fines = new int[count];
                    for (int i = 0; i < count; i++) fines[i] = reader.I32();
                }
                else if (param != 0 && param != 3) throw new InvalidDataException("unknown police parameters");
                return ("S002", null, null, null, null, null,
                    new PoliceStoryPayload4229938(mark, InteractionId: interaction, SectionId: section,
                        IsStandUp: stand, VehicleId: vehicle, SeatIndex: seat, Fines: fines), null);
            }
            case 35: // S011EnterVehicleRequestPayload { VehicleId u64, SeatIndices byte[]? }
            {
                ulong vehicleId = reader.U64();
                List<byte>? seats = null;
                if (reader.U8() != 0x00)
                {
                    int n = reader.Int7();
                    seats = new List<byte>(n);
                    for (int i = 0; i < n; i++) seats.Add(reader.U8());
                }
                return ("S011EnterVehicleRequest", vehicleId, seats, null, null, null, null, null);
            }
            case 36: // same shape under V2's build; kept for tolerance
            {
                ulong vehicleId = reader.U64();
                List<byte>? seats = null;
                if (reader.U8() != 0x00)
                {
                    int n = reader.Int7();
                    seats = new List<byte>(n);
                    for (int i = 0; i < n; i++) seats.Add(reader.U8());
                }
                return ("S011EnterVehicleRequest", vehicleId, seats, null, null, null, null, null);
            }
            case 37: // S011VehicleAndSeatPayload { VehicleId u64, SeatIndex byte }
            {
                ulong vehicleId = reader.U64();
                byte seat = reader.U8();
                return ("S011VehicleAndSeat", vehicleId, [seat], null, null, null, null, null);
            }
            default:
                throw new InvalidDataException($"unknown StoryNetPayload type mark {mark}");
        }
    }
}