using System.Numerics;
using AcDream.Core.Net.Packets;

namespace AcDream.Core.Net.Messages;

/// <summary>
/// Outbound <c>GameAction(Jump)</c> message — opcode <c>0xF61B</c>.
/// Sent when the player releases the spacebar to jump. The server uses
/// the extent + velocity to validate the jump and replicate it to nearby
/// clients.
///
/// Wire layout (from holtburger JumpActionData::pack):
///   u32 0xF7B1 (GameAction envelope)
///   u32 sequence
///   u32 0xF61B (Jump sub-opcode)
///   f32 extent (0.0–1.0 charge power)
///   f32 velocity.x, f32 velocity.y, f32 velocity.z
///   u16 instanceSequence
///   u16 serverControlSequence
///   u16 teleportSequence
///   u16 forcePositionSequence
///   u32 objectGuid (0 for normal jump)
///   u32 spellId (0 for normal jump)
/// </summary>
public static class JumpAction
{
    public const uint GameActionOpcode = 0xF7B1u;
    public const uint JumpOpcode       = 0xF61Bu;

    public static byte[] Build(
        uint gameActionSequence,
        float extent,
        Vector3 velocity,
        ushort instanceSequence,
        ushort serverControlSequence,
        ushort teleportSequence,
        ushort forcePositionSequence)
    {
        var w = new PacketWriter(48);

        w.WriteUInt32(GameActionOpcode);
        w.WriteUInt32(gameActionSequence);
        w.WriteUInt32(JumpOpcode);
        w.WriteFloat(extent);
        w.WriteFloat(velocity.X);
        w.WriteFloat(velocity.Y);
        w.WriteFloat(velocity.Z);
        w.WriteUInt16(instanceSequence);
        w.WriteUInt16(serverControlSequence);
        w.WriteUInt16(teleportSequence);
        w.WriteUInt16(forcePositionSequence);
        w.WriteUInt32(0); // objectGuid — 0 for normal jump
        w.WriteUInt32(0); // spellId — 0 for normal jump

        return w.ToArray();
    }
}