docs: add API reference for all user-facing packages

API_REFERENCE.md

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+# Strom API Reference
+
+Strom is a Go Minecraft protocol library for building servers, bots, and proxies.
+
+## Packages
+
+### `mc/api` — Accounts & Authentication
+
+```go
+// Account holds a player's name, UUID, and access token.
+type Account struct{ Name string; UUID uuid.UUID; AccessToken string }
+
+// NewAccount creates a profile from name, UUID, and access token.
+func NewAccount(name string, uuid uuid.UUID, ygg string) *Account
+
+// NewAccountFromYGG parses an YGGDRASIL-style access token into an Account.
+func NewAccountFromYGG(ygg string) *Account
+
+// NewOfflineAccount creates an offline (cracked) account from a display name.
+func NewOfflineAccount(name string) *Account
+
+// HasJoined validates a session with Mojang's session server.
+func HasJoined(name, server, ip string) (ProfileResp, error)
+
+// Profile fetches a player profile by UUID (with or without signatures).
+func Profile(id string, unsigned bool) (ProfileResp, error)
+
+// NameToId / NameToIdBulk look up UUIDs from player names.
+func NameToId(name string) (IdName, error)
+func NameToIdBulk(names []string) ([]IdName, error)
+
+// BlockedServers returns Mojang's blocklist.
+func BlockedServers() ([]string, error)
+
+// MojangPublicKeys returns Mojang's current signing keys.
+func MojangPublicKeys() (MojangPublicKeysResp, error)
+```
+
+### `mc/client` — Client Connections
+
+```go
+// Connect dials a Minecraft server with SRV record lookup.
+func Connect(ctx context.Context, addr string, version string) (*proto.Conn, error)
+
+// ConnectVersionLess dials a server without version negotiation (used for status pings).
+func ConnectVersionLess(ctx context.Context, addr string) (*proto.Conn, error)
+
+// Login performs the full login handshake (online mode + encryption).
+// Functional options: WithoutDns, WithContext, WithVersion.
+func Login(connectTo string, account *api.Account, settings ...func(*loginSettings)) (*proto.Conn, error)
+
+// LoginRaw logs in on an already-connected proto.Conn.
+func LoginRaw(c *proto.Conn, account *api.Account) error
+
+// IgnoreConfig discards all Configuration-state packets (use when bundling login → play).
+func IgnoreConfig(c *proto.Conn) error
+
+// MakeHandshakePacket builds a Handshake packet for the given next state.
+func MakeHandshakePacket(c *proto.Conn, nextState proto_base.State) (*v1_21_8.HandshakingToServerPacketSetProtocol, error)
+func MakeHandshakePacketAddr(s *proto.Conn, nextState proto_base.State, addr string) (*v1_21_8.HandshakingToServerPacketSetProtocol, error)
+
+// Status pings a server and returns the parsed response.
+func Status(ctx context.Context, addr string) (server.StatusResponse, error)
+
+// StatusNoDns is like Status but skips SRV record resolution.
+func StatusNoDns(addr string) (server.StatusResponse, error)
+
+// StatusRaw returns a low-level StatusClient for custom status workflows.
+func StatusRaw(ctx context.Context, addr string) (*StatusClient, error)
+```
+
+### `mc/client.StatusClient` — Programmatic Status Pings
+
+```go
+type StatusClient struct {
+    *proto.Conn
+    Status           string // raw JSON status response
+    PingSendTime     time.Time
+    PingReceiveTime  time.Time
+    DoPingRoundTripTime bool
+}
+
+func (s *StatusClient) OnStatus(p *v1_21_8.StatusToClientPacketServerInfo) error
+func (s *StatusClient) OnPong(p *v1_21_8.StatusToClientPacketPing) error
+```
+
+### `mc/server` — Server / Listen Side
+
+```go
+// StartServerWithOnConn listens on addr, accepts TCP connections, and calls onConn per connection.
+func StartServerWithOnConn(listenAddr string, onConn func(c *proto.Conn) error) error
+
+// Servee wraps a raw net.Conn into a proto.Conn with Servee actor.
+func Servee(cNet net.Conn) *proto.Conn
+
+// Kick sends a disconnect packet to the client.
+func Kick(c *proto.Conn, reason *text.Component, status string) error
+
+// ServeLogin handles the full login sequence (handshake → encryption → login → config → play).
+// Functional options: WithOtherAccount, WithRawStatus, WithStatus,
+//   WithCompatibleVersions, WithCompatibleVersionsRange, WithoutOnlineMode, WithoutEncryption.
+func ServeLogin(c *proto.Conn, settings ...LoginServerSetting) (*LoginServer, error)
+
+// ServeStatus handles a status-only connection (server list ping).
+func ServeStatus(c *proto.Conn, s StatusResponse) error
+
+// ServeConfig drives the configuration phase.
+func ServeConfig(c *proto.Conn) error
+```
+
+### `mc/proto` — Connection & Packet Helpers
+
+```go
+// NewConn / NewConnCtx create a new proto.Conn with an embedded event loop.
+func NewConn() *Conn
+func NewConnCtx(ctx context.Context) *Conn
+
+// SimplePacketToBytes encodes a typed packet to raw wire bytes (no length prefix).
+func SimplePacketToBytes(packet proto_base.EncodeDecodeAble) ([]byte, error)
+
+// SimplePacketToBytesLenPrefix encodes a typed packet with varint length prefix.
+func SimplePacketToBytesLenPrefix(packet proto_base.EncodeDecodeAble) ([]byte, error)
+
+// SimpleBytesToPacket decodes raw wire bytes into a typed packet.
+func SimpleBytesToPacket(packetBytes []byte, version int32, direction proto_base.Direction, state proto_base.State) (proto_base.EncodeDecodeAble, error)
+
+// Packet lookup by type/name.
+func LookUpTypeByPacketInfo(direction proto_base.Direction, state proto_base.State, pid, version int32) (proto_base.PacketInfo, bool)
+func LookupPacketInfoByType(packet proto_base.EncodeDecodeAble) (proto_base.PacketInfo, bool)
+func LookupPacketInfoByNameProtocolVersionAndState(name string, version int32, state proto_base.State) (proto_base.PacketInfo, bool)
+```
+
+#### `proto.Conn` Methods
+
+```go
+// SetVersion loads the packet definitions for the given Minecraft version.
+func (c *Conn) SetVersion(version string) error
+
+// SetState transitions the connection to a new protocol state (Handshake, Status, Login, Config, Play).
+func (c *Conn) SetState(s proto_base.State)
+
+// State returns the current protocol state.
+func (c *Conn) State() proto_base.State
+
+// Send encodes and writes a typed packet for the current state.
+func (c *Conn) Send(packet proto_base.EncodeDecodeAble) error
+
+// Receive reads, decodes, and returns the next packet.
+func (c *Conn) Receive() (proto_base.EncodeDecodeAble, error)
+
+// StartConn begins the event loop — blocks until the connection closes.
+func (c *Conn) StartConn() error
+
+// Fire dispatches an event through the handler chain.
+func (c *Conn) Fire(event any) error
+
+// RegisterCritical registers a handler that closes the loop if it returns an error.
+func (c *Conn) RegisterCritical(hs ...any)
+
+// RegisterCriticalUntilLatest registers handlers for all versions between the packet version and the latest supported version.
+// Auto-unregisters when SetVersion bumps the version.
+func (c *Conn) RegisterCriticalUntilLatest(hs ...any)
+
+// RegisterCriticalUntil registers handlers up to the specified version.
+func (c *Conn) RegisterCriticalUntil(until string, hs ...any)
+
+// HandlerFunctions maps packet types to registered handler reflect.Values.
+// Useful for direct handler invocation in tests.
+func (c *Conn) HandlerFunctions map[reflect.Type][]reflect.Value
+```
+
+### `mc/event` — Event Loop
+
+```go
+// NewLoop / NewLoopCtx create an event loop.
+func NewLoop() *Loop
+func NewLoopCtx(ctx context.Context) *Loop
+
+// RegisterCritical registers a handler that closes the loop on error.
+func (l *Loop) RegisterCritical(hs ...any)
+
+// FireFound dispatches an event to matching handlers.
+func (l *Loop) FireFound(event any) (found bool, err error)
+
+// ValidateHandler checks that a function matches the handler signature (func(packet T) error).
+func ValidateHandler(h any) (eventType reflect.Type, hv reflect.Value)
+```
+
+### `mc/proto_base` — Wire Types & Primitives
+
+```go
+// Packet types and metadata lookup.
+type State int32       // Handshake, Status, Login, Config, Play
+type Direction int     // ToServer, ToClient
+type Actor int         // Server, Client
+type PacketInfo struct { Direction Direction; State State; Version int32; PacketId int32 }
+
+// Varint encoding.
+func EncodeVarInt(w io.Writer, v int32) error
+func DecodeVarInt(r io.Reader) (int32, error)
+func EncodeVarLong(w io.Writer, v int64) error
+func DecodeVarLong(r io.Reader) (int64, error)
+
+// String encoding (varint-prefixed UTF-8).
+func EncodeString(w io.Writer, s string) error
+func DecodeString(r io.Reader) (string, error)
+
+// Packet direction helpers.
+func (a Actor) SendDirection() Direction
+func (a Actor) ReceiveDirection() Direction
+func (d Direction) Opposite() Direction
+func (d Direction) String() string
+```
+
+### `mc/data` — Minecraft Version Data
+
+```go
+// Version lookup.
+func LookUpVersionByName(name string) (VersionInfo, error)
+func LookUpVersionByProtocolVersion(version int32) (VersionInfo, error)
+func LookUpVersionByDataVersion(version int32) (VersionInfo, error)
+func MustLookupProtocolVersion(version string) int32
+
+// Block data.
+func BlocksForVersion(v string) []*Block
+func LookupBlockByStateId(version string, stateId int32) (*Block, bool)
+func LookupBlockByName(version string, name string) (*Block, bool)
+func StateIdFromBlocKAndStateMap(version string, name string, stateMap map[string]string) (int32, error)
+func FromBlockState(version string, stateId int32) (*Block, map[string]string, error)
+
+// Biome data.
+func BiomesForVersion(v string) []*Biome
+func LookupBiomeById(version string, id int32) (*Biome, bool)
+func LookupBiomeByName(version string, name string) (*Biome, bool)
+
+// Item data.
+func ItemsForVersion(v string) []*Item
+func LookupItemById(version string, id int32) (*Item, bool)
+func LookupItemByName(version string, name string) (*Item, bool)
+
+// Noise / generation data.
+func LoadMultiNoise(version string) (*MultiNoiseData, error)
+
+// Registry data.
+func LoadRegistry(name string) (*nbt2.Tag, error)
+
+// Generic JSON loading (relative to minecraft-data directory).
+func LoadJson(path string, data any) error
+func LoadVersionedJson(version, dataName string, data any) error
+```
+
+### `mc/crypto` — Encryption Helpers
+
+```go
+func AuthDigest(elems ...[]byte) string
+func NewCFB8Decrypt(c cipher.Block, iv []byte) *CFB8
+func NewCFB8Encrypt(c cipher.Block, iv []byte) *CFB8
+func FromOfflinePlayer(displayName string) uuid.UUID
+```
+
+### `mc/text` — Text Components
+
+```go
+// Pretty wraps a plain string in a Component.
+func Pretty(s string) *Component
+
+// PrettyF wraps a formatted string in a Component.
+func PrettyF(format string, args ...any) *Component
+
+// PrettyPlaceholders replaces placeholders in a translation string.
+func PrettyPlaceholders(format string, placeholders map[string]any) *Component
+```
+
+### `mc/nbt` — Named Binary Tag I/O
+
+```go
+func ReadFile(r io.Reader, data any) error
+func ReadUnstructuredFile(r io.Reader) (*Tag, error)
+func ReadUnstructuredFilePath(path string) (*Tag, error)
+func WriteUnstructuredFile(w io.Writer, n *Tag) error
+func WriteUnstructuredFilePath(path string, n *Tag) error
+func PrintSNBTAny(t any, w io.Writer) error
+```
+
+### `mc/level` — World & Chunk Data
+
+```go
+// Chunk reading.
+func ReadChunkFromChunkPacketData(r io.Reader, version string, worldHeight int) (*Chunk, error)
+
+// Section / storage format helpers.
+func MakeBiomeFormat(version string) StorageFormat
+func MakeBlockFormat(version string) StorageFormat
+func ReadSectionStorage(r io.Reader, format StorageFormat) (*Storage, error)
+func WriteSectionStorage(w io.Writer, s *Storage) error
+func SectionDecodePacket(r io.Reader, version string) (Section, error)
+func SectionEncodePacket(w io.Writer, s Section) error
+func SectionEquals(a, b Section) bool
+func CountStorage(s *Storage, v int32) int
+```
+
+#### `mc/level/anvil` — Anvil Region Format
+
+```go
+func ReadLevelData(r io.Reader) (Level, error)
+func ReadChunkHeader(r *os.File) (*ChunkHeader, error)
+```
+
+#### `mc/level/structure` / `mc/level/litematic`
+
+```go
+func Load(fileName string) (*Structure, error)              // structure
+func LoadFromPath(path string) (*Structure, error)           // litematic
+func LoadFromFile(r io.Reader) (*Structure, error)           // litematic
+```
+
+### `mc/gen` — World Generation
+
+```go
+func XoroshiroFromSeed(seed int64) Xoroshiro
+func XoroshiroFromString(s string) Xoroshiro
+func PerlinNoiseFromXoroshiro(x Xoroshiro) PerlinNoise
+func OctaveFromXoroshiro(x *Xoroshiro, amplitudes []float64, omin, lenn, nmax int) Octave
+func DoublePerlinFromXoroshiro(x *Xoroshiro, amplitudes []float64, omin, lenn, nmax int) DoublePerlin
+func BiomeNoiseFromXoroshiro(x Xoroshiro, large bool) BiomeNoise
+func CreateBiomeDepthSpline() Spline
+```
+
+### `mc/mapstructure` — Tag-Based Decoder
+
+```go
+// Decode populates a struct from a map using struct tags.
+func Decode(data any, v any) error
+
+// NewFormat creates a custom format with options.
+func NewFormat(name string, opts ...Option) *Format
+
+// Options.
+func WithRequireAll() Option
+func WithErrorOnExtra() Option
+func WithTrySnakeCase() Option
+func WithTryLowCase() Option
+func WithTypeCodec(decodeFn, encodeFn any) Option
+```
+
+### `mc/util` — Miscellaneous Helpers
+
+```go
+func CamelCase(s string) string
+func SnakeCase(s string) string
+func FirstLetterLower(s string) string
+func FloorDiv(a, b int32) int32
+func BpeByNum(x float64) uint8
+func Must(err error)
+```
+
+## Handler Signature
+
+All event handlers must match:
+```go
+func(typedPacket) error
+```
+The argument must implement `proto_base.EncodeDecodeAble` (has `Decode`/`Encode` methods). Return `event.HandlerDoneErr{}` to stop the loop cleanly, or any other error to close the connection.
+
+## Quick Recipes
+
+### Server list ping
+```go
+// Programmatic
+resp, err := client.Status(context.Background(), "mc.hypixel.net:25565")
+
+// With raw JSON
+s, err := client.StatusRaw(ctx, addr)
+_ = json.Unmarshal([]byte(s.Status), &resp)
+```
+
+### Start a server
+```go
+server.StartServerWithOnConn(":25565", func(c *proto.Conn) error {
+    c.RegisterCriticalUntilLatest(handleHandshake, handleLogin)
+    return c.StartConn()
+})
+```
+
+### Construct a packet without a connection
+```go
+// Encode to wire format
+b, err := proto.SimplePacketToBytesLenPrefix(&v1_21_8.StatusToServerPacketPing{Time: 1234})
+
+// Decode from wire format
+packet, err := proto.SimpleBytesToPacket(bytes, 772, proto_base.ToClient, proto_base.Status)
+info, ok := packet.(*v1_21_8.StatusToClientPacketServerInfo)
+```
+
+### Look up version data
+```go
+v, _ := data.LookUpVersionByName("1.21.8")
+block, _ := data.LookupBlockByName("1.21.8", "minecraft:stone")
+protocol := data.MustLookupProtocolVersion("1.21.8")
+```
+
+### Read NBT
+```go
+tag, _ := nbt.ReadUnstructuredFile(file)
+data.Level level
+nbt.ReadFile(file, &data)
+```