// Message type constants
export const TypeAuthenticate  = 'authenticate';
export const TypeCreateSession = 'create_session';
export const TypeJoinSession   = 'join_session';
export const TypeOffer         = 'offer';
export const TypeAnswer        = 'answer';
export const TypeICECandidate  = 'ice_candidate';
export const TypeHeartbeat     = 'heartbeat';
export const TypeEndCall       = 'end_call';

export const TypeAuthenticated     = 'authenticated';
export const TypeSessionCreated    = 'session_created';
export const TypeSessionJoined     = 'session_joined';
export const TypeParticipantJoined = 'participant_joined';
export const TypeParticipantLeft   = 'participant_left';
export const TypeCallTimeout       = 'call_timeout';
export const TypeCallEnded         = 'call_ended';
export const TypePong              = 'pong';
export const TypeUnauthorized      = 'unauthorized';
export const TypeError             = 'error';

// Error codes
export const ErrRideNotActive       = 'ride_not_active';
export const ErrRideAlreadyStarted  = 'ride_already_started';
export const ErrRideCancelled       = 'ride_cancelled';
export const ErrSessionExists       = 'session_exists';
export const ErrSessionNotFound     = 'session_not_found';
export const ErrSessionFull         = 'session_full';
export const ErrUnauthorizedUser    = 'unauthorized_user';
export const ErrTokenExpired        = 'token_expired';
export const ErrTokenInvalid        = 'token_invalid';
export const ErrPayloadTooLarge     = 'payload_too_large';
export const ErrRateLimited         = 'rate_limited';

// Helper constructors for encoding server messages
export const newAuthenticated = (userID, iceServers) => JSON.stringify({ type: TypeAuthenticated, user_id: userID, ice_servers: iceServers });
export const newSessionCreated = (sessionID, rideID, expiresIn) => JSON.stringify({ type: TypeSessionCreated, session_id: sessionID, ride_id: rideID, expires_in: expiresIn });
export const newSessionJoined = (sessionID, rideID) => JSON.stringify({ type: TypeSessionJoined, session_id: sessionID, ride_id: rideID });
export const newParticipantJoined = (role) => JSON.stringify({ type: TypeParticipantJoined, role });
export const newRelayOffer = (sdp) => JSON.stringify({ type: TypeOffer, sdp });
export const newRelayAnswer = (sdp) => JSON.stringify({ type: TypeAnswer, sdp });
export const newRelayICE = (candidate) => JSON.stringify({ type: TypeICECandidate, candidate });
export const newParticipantLeft = (role) => JSON.stringify({ type: TypeParticipantLeft, role });
export const newCallTimeout = (reason) => JSON.stringify({ type: TypeCallTimeout, reason });
export const newCallEnded = (reason) => JSON.stringify({ type: TypeCallEnded, reason });
export const newPong = () => JSON.stringify({ type: TypePong });
export const newUnauthorized = (reason) => JSON.stringify({ type: TypeUnauthorized, reason });
export const newError = (code, message) => JSON.stringify({ type: TypeError, code, message });