import { join } from "@std/path";

export interface PollerState {
  lastEventTimestamp: string | null;
}

export async function loadPollerState(dataDir: string): Promise<PollerState> {
  const path = join(dataDir, "poller-state.json");
  try {
    const text = await Deno.readTextFile(path);
    return JSON.parse(text) as PollerState;
  } catch {
    return { lastEventTimestamp: null };
  }
}

export async function savePollerState(
  dataDir: string,
  state: PollerState,
): Promise<void> {
  const path = join(dataDir, "poller-state.json");
  await Deno.mkdir(dataDir, { recursive: true });
  await Deno.writeTextFile(path, JSON.stringify(state, null, 2));
}