/**
 * Peer Sync — Type Definitions
 *
 * DESIGN.md §3.5, §10.5 — Peer sync + CRDTs.
 * Types for peer identity, sync messages, causal DAG, and
 * branch concurrency modes.
 */
import type { VcsOp } from '../vcs/types.js';
export interface PeerId {
    /** Unique peer identifier (typically derived from identity DID). */
    id: string;
    /** Human-readable display name. */
    name: string;
    /** Last seen timestamp. */
    lastSeen?: string;
}
/**
 * Wire protocol version. Bumped when the message shape or semantics change
 * in a way that older peers cannot safely ignore. All outbound messages
 * carry this value; receivers reject anything outside the supported range
 * with a `protocol-version` nack.
 */
export declare const PROTOCOL_VERSION: 1;
export declare const MIN_SUPPORTED_VERSION: 1;
export declare const MAX_SUPPORTED_VERSION: 1;
export type SyncMessage = SyncHaveMessage | SyncWantMessage | SyncOpsMessage | SyncAckMessage | SyncNackMessage | SyncSnapshotRequestMessage | SyncSnapshotMessage | SyncGraphSnapshotMessage | SyncLaneJournalMessage | SyncDecisionTraceMessage | SyncEntityDeltaMessage;
export type SyncMessageHandler = (message: SyncMessage) => void | Promise<void>;
/**
 * Categorical reasons a receiver may reject ops sent over the wire.
 *
 * Engine-level reasons (`invalid-kind`, `hash-mismatch`, `missing-dependency`,
 * `apply-failed`) mirror `IntegrateOpRejectReason` so engine rejections flow
 * back to the sender unchanged. Wire-level reasons (`protocol-version`)
 * describe failures detected by the sync layer itself. The union is kept
 * separate so the wire protocol does not drift with engine internals.
 */
export type NackReason = 'invalid-kind' | 'hash-mismatch' | 'missing-dependency' | 'apply-failed' | 'protocol-version' | 'destructive-op' | 'bulk-delete' | 'system-modification' | 'quarantine-required';
/** Advertise which op hashes we have. */
export interface SyncHaveMessage {
    version: number;
    type: 'have';
    peerId: string;
    /** Our head op hashes (one per branch). */
    heads: Record<string, string>;
    /** Total op count for quick comparison. */
    opCount: number;
}
/** Request ops we're missing. */
export interface SyncWantMessage {
    version: number;
    type: 'want';
    peerId: string;
    /** Op hashes we need (those the remote has but we don't). */
    wantHashes: string[];
    /** Alternatively: request all ops after a given hash. */
    afterHash?: string;
    /**
     * When set with empty `wantHashes` and no `afterHash`, request a truncated
     * tail snapshot instead of the full room log (late-joiner catch-up).
     */
    maxOps?: number;
}
/** Request a truncated tail snapshot from a room peer. */
export interface SyncSnapshotRequestMessage {
    version: number;
    type: 'sync-snapshot';
    peerId: string;
    /** Max ops in the tail. Default chosen by the room (usually 500). */
    maxOps?: number;
}
/**
 * Room response: recent tail of the canonical log plus metadata.
 * Clients integrate `ops` like a normal `ops` message.
 */
export interface SyncSnapshotMessage {
    version: number;
    type: 'snapshot';
    peerId: string;
    /** Head hash of the full room log (may be beyond the returned tail). */
    headHash?: string;
    /** Total ops in the room canonical log. */
    opCount: number;
    /** True when `ops` is a truncated tail, not the full log. */
    truncated: boolean;
    ops: VcsOp[];
}
/** Send a batch of ops. */
export interface SyncOpsMessage {
    version: number;
    type: 'ops';
    peerId: string;
    ops: VcsOp[];
}
/** Acknowledge receipt. */
export interface SyncAckMessage {
    version: number;
    type: 'ack';
    peerId: string;
    /** Hashes of ops we've integrated (or already had). */
    integrated: string[];
}
/**
 * Reject one or more ops. Grouped by `reason` so a single batch may produce
 * several nacks if rejections fall into multiple categories.
 */
export interface SyncNackMessage {
    version: number;
    type: 'nack';
    peerId: string;
    /** Hashes of ops that were rejected for this reason. */
    refs: string[];
    reason: NackReason;
    /** Optional human-readable detail for logs. */
    details?: string;
}
/**
 * SQLite database snapshot for full graph state sync.
 * Contains the complete graph database as a binary snapshot.
 */
export interface SyncGraphSnapshotMessage {
    version: number;
    type: 'graph-snapshot';
    peerId: string;
    /** SHA-256 hash of the snapshot data. */
    snapshotHash: string;
    /** Base64-encoded SQLite database snapshot. */
    snapshotData: string;
    /** Total entity count in snapshot. */
    entityCount: number;
    /** Snapshot timestamp. */
    timestamp: string;
}
/**
 * Lane-specific op journal for multi-agent isolation.
 * Syncs lane journals separately from integration ops.
 */
export interface SyncLaneJournalMessage {
    version: number;
    type: 'lane-journal';
    peerId: string;
    /** Lane ID (UUID). */
    laneId: string;
    /** Head hash of this lane's journal. */
    headHash: string;
    /** JSONL-encoded lane journal ops. */
    journalData: string;
    /** Total ops in this lane. */
    opCount: number;
}
/**
 * Decision trace history for audit trail sync.
 * Syncs structured decision traces between environments.
 */
export interface SyncDecisionTraceMessage {
    version: number;
    type: 'decision-trace';
    peerId: string;
    /** Decision trace ID. */
    traceId: string;
    /** JSON-encoded decision trace data. */
    traceData: string;
    /** Associated issue/operation ID. */
    relatedOpId?: string;
}
/**
 * Incremental entity delta for efficient graph updates.
 * Contains only changed entities (add/modify/delete).
 */
export interface SyncEntityDeltaMessage {
    version: number;
    type: 'entity-delta';
    peerId: string;
    /** Delta hash for deduplication. */
    deltaHash: string;
    /** Base snapshot hash this delta applies to. */
    baseSnapshotHash: string;
    /** JSON-encoded entity changes. */
    entityData: string;
    /** Number of entities in this delta. */
    entityCount: number;
    /** Change types present: add, modify, delete. */
    changeTypes: ('add' | 'modify' | 'delete')[];
}
export interface SyncState {
    /** Our peer identity. */
    localPeerId: string;
    /** Known peers and their head hashes. */
    peerHeads: Map<string, Record<string, string>>;
    /** Ops we've sent but not yet acknowledged. */
    pendingAcks: Set<string>;
    /** Last sync timestamp per peer. */
    lastSync: Map<string, string>;
}
export interface BranchPolicy {
    /** If true, only fast-forward appends (one writer). Default. */
    linear: boolean;
}
export interface SyncTransport {
    /** Send a message to a specific peer. */
    send(peerId: string, message: SyncMessage): Promise<void>;
    /** Register a handler for incoming messages. */
    onMessage(handler: SyncMessageHandler): void;
    /** List connected peers. */
    peers(): PeerId[];
}
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