enum State(i32) {
    Handshake
    Status
    Login
    Play
}

enum NextState(VarInt) {
    Status = 1
    Login
}
enum Mouse(i8) {
    LeftClick
    RightClick
}
enum Status(i8) {
    StartDigging
    CancelDigging
    FinishDigging
    DropItemStack
    DropItem
    ShootArrowOrFinishEating
}
enum Face(i8) {
    Down
    Up
    North
    South
    West
    East
}
enum Animation(i8) {
    None
    SwingArm
    TakeDamage
    LeaveBed
    EatFood
    CriticalEffect
    MagicCriticalEffect
    Unknown = 102
    Crouch = 104
    Uncrouch
}
enum EntityAction(i8) {
    Crouch = 1
    Uncrouch
    LeaveBed
    StartSprinting
    StopSprinting
}


type Slot {
    i16 id
    if (id != -1) {
        i8 count
        i16 damage
        i16 data_length
        if (data_length != -1) {
            Nbt data
        }
    }
}


// Handshake
packet Handshake(serverbound, Handshake, 0x00) {
    VarInt protocol_version = PVN
    String server_address
    u16 server_port
    NextState next_state
}


// Status
packet Request(serverbound, Status, 0x00) {}
packet Ping(serverbound, Status, 0x01) {
    i64 time
}


// Login
packet LoginStart(serverbound, Login, 0x00) {
    String name
}
packet EncryptionResponse(serverbound, Login, 0x01) {
    u16 shared_secret_length = len(shared_secret)
    List[u8] shared_secret
    u16 verify_token_length = len(verify_token)
    List[u8] verify_token
}
packet Disconnect(clientbound, Login, 0x00) {
    String json_data
}
packet EncryptionRequest(clientbound, Login, 0x01) {
    String server_id
    u16 public_key_length = len(public_key)
    List[u8] public_key
    u16 verify_token_length = len(verify_token)
    List[u8] verify_token
}
packet LoginSuccess(clientbound, Login, 0x02) {
    String uuid
    String username
}


// Play
packet KeepAlive(serverbound, Play, 0x00) {
    i32 keep_alive_id
}
packet ChatMessage(serverbound, Play, 0x01) {
    String message
}
packet UseEntity(serverbound, Play, 0x02) {
    i32 target
    Mouse mouse
}
packet Player(serverbound, Play, 0x03) {
    bool on_ground
}
packet PlayerPosition(serverbound, Play, 0x04) {
    f64 x
    f64 feet_y
    f64 head_y
    f64 z
    bool on_ground
}
packet PlayerLook(serverbound, Play, 0x05) {
    f32 yaw
    f32 pitch
    bool on_ground
}
packet PlayerPositionAndLook(serverbound, Play, 0x06) {
    f64 x
    f64 feet_y
    f64 head_y
    f64 z
    f32 yaw
    f32 pitch
    bool on_ground
}
packet PlayerDigging(serverbound, Play, 0x07) {
    Status status
    i32 x
    u8 y
    i32 z
    Face face
}
packet PlayerBlockPlacement(serverbound, Play, 0x08) {
    i32 x
    u8 y
    i32 z
    i8 direction
    Slot held_item
    i8 cursor_x
    i8 cursor_y
    i8 cursor_z
}
packet HeldItemChange(serverbound, Play, 0x09) {
    i16 slot
}
packet Animation(serverbound, Play, 0x0A) {
    i32 entity_id
    Animation animation
}
packet EntityAction(serverbound, Play, 0x0B) {
    i32 entity_id
    EntityAction action
    i32 jump_boost
}
packet SteerVehicle(serverbound, Play, 0x0C) {
    f32 sideways
    f32 forward
    bool jump
    bool unmount
}
packet CloseWindow(serverbound, Play, 0x0D) {
    i8 window_id
}
// packet ClickWindow(serverbound, Play, 0x0E) {
//     i8 window_id       //! TODO
//     i16 slot           //! TODO
//     i8 button          //! TODO
//     i16 action         //! TODO
//     i8 mode            //! TODO
//     Slot clicked_item  //! TODO
// }