import type { Failure, Success } from "../async-op.ts";
import type { CurrentUser, FailurePayload, SessionInfo } from "../types.ts";

export type EmitterActor<Outgoing> = {
  sendBack: (event: Outgoing) => void;
};

export type PullResult =
  | Success<{ pulled: SyncedItem[] }>
  | Failure<FailurePayload>;

export type PushResult =
  | Success<{ pushed: SyncedItem[]; pulled: SyncedItem[] }>
  | Failure<FailurePayload>;

export type SyncedItem = {
  id: string;
  name: string;
  updatedTs: number;
  deleted: boolean;
};

export type SyncAttempt = {
  startedTs: number;
  pull: PullResult | null;
  push: PushResult | null;
};

export type MachineContext = {
  currentSync: SyncAttempt | null;
  lastSuccessfulSyncTs: number | null;
  currentUser: CurrentUser | null;
  sessionInfo: SessionInfo | null;
  pushOnceIdle: boolean;
  syncLog: SyncAttempt[];
};

export type MachineEvent =
  | { type: "push" }
  | { type: "pull" }
  | { type: "currentUser"; currentUser: CurrentUser }
  | { type: "serverUser"; serverUser: CurrentUser }
  | { type: "sessionInfo"; sessionInfo: SessionInfo }
  | { type: "sessionExpired" }
  | { type: "reset" };