//#region src/harness/store/store.d.ts
/**
 * A session store for harnesses, on a Durable Object's SQLite database.
 *
 * Any harness that runs its agent somewhere other than the object (a
 * container, a sandbox, a remote process) needs the same few things kept
 * durably next to it: which sessions exist, which operations were submitted
 * and how each one ended, and the session's history in whatever format the
 * harness speaks. This store keeps those and nothing more. It knows no
 * message format, no event vocabulary and no runtime: inputs, results,
 * session state and log entries are opaque JSON that the harness parses.
 *
 * Three record kinds:
 *
 * - **Sessions**: an id, an optional parent (a fork), and one JSON state
 *   value the harness owns (model, cursors, resume handles).
 * - **Operations**: one row per submitted operation, keyed by an
 *   idempotency id within its session, moving `queued` → `running` →
 *   `done` | `unanswered`. Transitions are guarded in SQL, so a duplicate or
 *   late transition is a no-op rather than a regression.
 * - **Logs**: named, append-ordered streams of JSON entries per session
 *   (`"messages"`, `"engine"`, …). An entry may carry an id, and an entry
 *   written again under the same id replaces the old one in place. Entries
 *   larger than one SQLite row are split across continuation rows.
 *
 * The store is synchronous, like the SQL API under it, so a harness can
 * group several writes in `transaction()` without awaiting.
 *
 * @experimental The API may change before it stabilizes.
 */
/** A JSON value, as the store keeps it. */
type JsonValue =
  | string
  | number
  | boolean
  | null
  | readonly JsonValue[]
  | {
      readonly [key: string]: JsonValue;
    };
/** Where an operation is in its life. */
type OperationStatus = "queued" | "running" | "done" | "unanswered";
/** A session, as stored. */
type SessionRecord = {
  readonly id: string /** The session this one was forked from. */;
  readonly parent:
    | string
    | undefined /** Harness-owned state. `null` until the harness writes some. */;
  readonly state: JsonValue;
  readonly createdAt: number;
  readonly updatedAt: number;
};
/** One operation, as stored. */
type OperationRecord = {
  readonly session: string /** The idempotency key, unique within the session. */;
  readonly id: string /** Submission order within the whole store. */;
  readonly seq: number;
  readonly status: OperationStatus /** What was submitted, in the harness's format. */;
  readonly input: JsonValue /** Harness-owned submission options and bookkeeping. */;
  readonly meta: JsonValue /** The harness's result for a `done` operation, else `null`. */;
  readonly result: JsonValue /** Why an `unanswered` operation ended. */;
  readonly reason: string | undefined;
  readonly createdAt: number;
  readonly settledAt: number | undefined;
};
/** One log entry, as stored. */
type LogEntry = {
  /** Position in the log. Stable when the entry is replaced by id. */ readonly seq: number;
  readonly id: string | undefined;
  readonly data: JsonValue;
  readonly createdAt: number;
};
/** One entry to append. */
type LogAppend = {
  /** Replace an existing entry with this id in place, instead of appending. */ readonly id?: string;
  readonly data: JsonValue;
};
/** How an operation ended. */
type OperationOutcome =
  | {
      readonly status: "done";
      readonly result: JsonValue;
    }
  | {
      readonly status: "unanswered";
      readonly reason: string;
    };
/** `openHarnessStore`'s options. */
type HarnessStoreOptions = {
  /**
   * Prefix for the store's tables. Two harnesses in one object use two
   * prefixes. Must not start with `_cf_`, which Durable Objects reserve.
   * Default `harness_`.
   */
  readonly prefix?: string;
};
/**
 * Open the store over this object's SQLite database, creating its tables on
 * first use. Cheap: call it once per isolate and keep the result.
 *
 * @param storage - The Durable Object's storage.
 * @param options - Table prefix.
 * @returns The store.
 */
declare function openHarnessStore(
  storage: DurableObjectStorage,
  options?: HarnessStoreOptions
): HarnessStore;
/**
 * The store. Construct it with `openHarnessStore`.
 *
 * @experimental The API may change before it stabilizes.
 */
declare class HarnessStore {
  #private;
  /**
   * @param storage - The Durable Object's storage.
   * @param options - Table prefix.
   */
  constructor(storage: DurableObjectStorage, options: HarnessStoreOptions);
  /**
   * Run `fn` in one storage transaction. Writes inside it commit together or
   * not at all.
   *
   * @template T - What `fn` returns.
   * @param fn - Synchronous work against this store.
   * @returns What `fn` returned.
   */
  transaction<T>(fn: () => T): T;
  /**
   * Create a session, or return the existing one with this id unchanged.
   *
   * @param input - The id, an optional parent, and the initial state.
   *   `createdAt` keeps the creation time of a session imported from
   *   elsewhere, so the session list stays in creation order; default now.
   * @returns The stored session.
   */
  createSession(input: {
    readonly id: string;
    readonly parent?: string;
    readonly state?: JsonValue;
    readonly createdAt?: number;
  }): SessionRecord;
  /**
   * Read one session.
   *
   * @param id - The session id.
   * @returns The session, or `undefined` when there is none.
   */
  session(id: string): SessionRecord | undefined;
  /**
   * Every session, oldest first.
   *
   * @returns The sessions.
   */
  sessions(): SessionRecord[];
  /**
   * Replace a session's harness-owned state.
   *
   * @param id - The session id.
   * @param state - The new state.
   * @returns False when there is no such session.
   */
  setSessionState(id: string, state: JsonValue): boolean;
  /**
   * Delete a session with its operations and logs.
   *
   * @param id - The session id.
   * @returns False when there was no such session.
   */
  deleteSession(id: string): boolean;
  /**
   * Durably queue an operation. Idempotent on `(session, id)`: a second
   * enqueue with the same id stores nothing and returns the first record.
   *
   * @param input - The session, the idempotency id, the input and options.
   * @returns The stored record, and whether this call created it.
   */
  enqueue(input: {
    readonly session: string;
    readonly id: string;
    readonly input: JsonValue;
    readonly meta?: JsonValue;
  }): {
    readonly record: OperationRecord;
    readonly accepted: boolean;
  };
  /**
   * Read one operation.
   *
   * @param session - The session id.
   * @param id - The operation id.
   * @returns The operation, or `undefined` when there is none.
   */
  operation(session: string, id: string): OperationRecord | undefined;
  /**
   * Operations in submission order, optionally narrowed to one session and
   * to some statuses.
   *
   * @param filter - The session and statuses to keep. Default: all.
   * @returns The matching operations, oldest first.
   */
  operations(filter?: {
    readonly session?: string;
    readonly status?: readonly OperationStatus[];
  }): OperationRecord[];
  /**
   * Move a queued operation to `running`.
   *
   * @param session - The session id.
   * @param id - The operation id.
   * @returns False when it was not queued.
   */
  start(session: string, id: string): boolean;
  /**
   * Move a running operation back to `queued`, to run it again.
   *
   * @param session - The session id.
   * @param id - The operation id.
   * @returns False when it was not running.
   */
  requeue(session: string, id: string): boolean;
  /**
   * Settle a queued or running operation.
   *
   * @param session - The session id.
   * @param id - The operation id.
   * @param outcome - How it ended.
   * @returns False when it had already settled or does not exist.
   */
  settle(session: string, id: string, outcome: OperationOutcome): boolean;
  /**
   * Delete one operation, whatever its status. Its id may be enqueued
   * again. For replacing a record imported from elsewhere; a harness that
   * deletes an open operation must stop running it itself.
   *
   * @param session - The session id.
   * @param id - The operation id.
   * @returns False when there was no such operation.
   */
  deleteOperation(session: string, id: string): boolean;
  /**
   * Forget a session's settled operations, as when the session starts
   * over. Open operations are kept. A forgotten operation's id may be
   * enqueued again.
   *
   * @param session - The session id.
   * @returns How many operations were deleted.
   */
  deleteSettled(session: string): number;
  /**
   * Replace an operation's harness-owned bookkeeping.
   *
   * @param session - The session id.
   * @param id - The operation id.
   * @param meta - The new value.
   * @returns False when there is no such operation.
   */
  setOperationMeta(session: string, id: string, meta: JsonValue): boolean;
  /**
   * Append entries to a session's log. An entry with an id that is already
   * in the log replaces that entry in place, keeping its position.
   *
   * @param session - The session id.
   * @param log - The log's name, such as `"messages"`.
   * @param entries - The entries, in order.
   * @returns The position of the last entry written, or of the log's end.
   */
  append(session: string, log: string, entries: readonly LogAppend[]): number;
  /**
   * Read a session's log in order.
   *
   * @param session - The session id.
   * @param log - The log's name.
   * @param range - Entries after position `after` (exclusive), at most `limit`.
   * @returns The entries.
   */
  read(
    session: string,
    log: string,
    range?: {
      readonly after?: number;
      readonly limit?: number;
    }
  ): LogEntry[];
  /**
   * One entry by id.
   *
   * @param session - The session id.
   * @param log - The log's name.
   * @param id - The entry id.
   * @returns The entry, or `undefined`.
   */
  entry(session: string, log: string, id: string): LogEntry | undefined;
  /**
   * The position of a log's last entry.
   *
   * @param session - The session id.
   * @param log - The log's name.
   * @returns The position, or 0 for an empty log.
   */
  end(session: string, log: string): number;
  /**
   * Empty a session's log.
   *
   * @param session - The session id.
   * @param log - The log's name.
   */
  clear(session: string, log: string): void;
  /**
   * Copy one session's log onto the end of another's, keeping entry ids.
   *
   * @param from - The source session.
   * @param to - The target session.
   * @param log - The log's name.
   */
  copy(from: string, to: string, log: string): void;
}
//#endregion
export {
  LogEntry as a,
  OperationStatus as c,
  LogAppend as i,
  SessionRecord as l,
  HarnessStoreOptions as n,
  OperationOutcome as o,
  JsonValue as r,
  OperationRecord as s,
  HarnessStore as t,
  openHarnessStore as u
};
//# sourceMappingURL=store-BKM4Xm9M.d.ts.map