import { dueNudges, recordNudgeSent, getUserById } from 'officerdb';
import { resolveHomeDir } from '@@/user-home';
import { startClaudeTurn, CHAT_DEFAULT_MODEL } from './websocket';

// Nudger: the schedule that keeps a chat moving while nobody is watching it.
//
// ── Why this can exist at all ──
//
// `startClaudeTurn` already takes `ws: null`. It was extracted that way so `POST /command-hq/commanders/new`
// could drive a turn over HTTP, and that is the whole door this feature needed — a way into a live session
// that is not the chat websocket. Nothing new is exposed; this is a second caller of an existing path.
//
// ── The rule that matters ──
//
// NEVER speak while the agent is working. A prompt delivered mid-turn is noise at best and a derail at
// worst, and the point of this is to restart a stopped agent rather than hurry a busy one.
//
// So `every_seconds` is a FLOOR, not a metronome. When a nudge comes due and the session is generating,
// the row is left alone and reconsidered on the next tick — which means it fires as soon as the turn ends
// rather than sleeping through to the next hour. "At most every N seconds, and as soon as idle after
// that" is what someone asking for this actually wants; a strict hourly alarm would skip an agent that
// finished four minutes late and leave it idle for the other fifty-six.

const TICK_MS = 60_000;

/**
 * There is no safety check any more, and that is the point.
 *
 * ── What was here ──
 *
 * Three refusals: the session is not live, the session is generating, or anything else is live on the
 * machine. Written on 2026-08-20 after a nudge fired at a garbage-collected session and a second Claude
 * with bypassed permissions appeared in a repository another agent was mid-build in.
 *
 * ── Why all three are gone ──
 *
 * **Not live** was fixed elsewhere and the guard outlived it. `fire()` passes `resumeSessionId`, and
 * `claude-manager` resolves `getClaudeSession(sessionKey) ?? params.resumeSessionId` into the SDK's
 * `resume` — so a collected session resumes its own transcript rather than starting a new agent. That is
 * what a schedule attached to a conversation always meant.
 *
 * **Anything else live** refused on the presence of any agent anywhere, because the sidecar does not report
 * working directories and the check could not tell "another agent in this conversation" from "an unrelated
 * chat". On a machine running commanders that is always true, so no nudge could ever fire — silently: the
 * row stayed enabled, `sentCount` stayed 0, and whatever scheduled it reported success. It was a ban on the
 * feature wearing the clothes of a safety check.
 *
 * **Generating** was the last one, and it went for a better reason than the others: it was refusing to do
 * something that already works. Each session is one long-lived `query()` driven by a STREAMING INPUT QUEUE
 * (`claude-manager.ts` → "Persistent streaming sessions"), and a turn is one message pushed onto it. A
 * message sent to a busy session is not rejected and not lost — it is queued, and delivered when the
 * current turn ends. Waiting is fine; disappearing is not, and refusing here meant disappearing.
 *
 * ── What this costs, stated plainly ──
 *
 * Nudging conversation A while conversation B is live in the same working tree still puts two agents in one
 * directory. That is real and it is the owner's call, made 2026-08-25: a message that must arrive is worth
 * more than a guard that could only ever be right by accident, since it never knew the directories either.
 * Fixing it properly needs the sidecar to report each session's cwd.
 */

async function fire(nudge: { id: number; userId: number; sessionId: string; message: string }): Promise<void> {
  const user = await getUserById(nudge.userId);
  const resolved = await resolveHomeDir(nudge.userId);
  if (!user || !resolved.ok) return;

  await new Promise<void>((resolve) => {
    let settled = false;
    const done = () => {
      if (!settled) {
        settled = true;
        resolve();
      }
    };
    // A turn that never reports back must not wedge the tick — the next one will reconsider the row.
    const timer = setTimeout(done, 30_000);

    void startClaudeTurn({
      email: user.email,
      username: user.username ?? user.email,
      userId: nudge.userId,
      // No socket. Whoever is watching the chat gets the turn through their own connection, the same way
      // they would see a turn started from another tab.
      ws: null,
      sessionId: nudge.sessionId,
      // The constant, not a copy of its value — a nudge is an unattended turn and belongs with every
      // other surface that never had a picker.
      model: CHAT_DEFAULT_MODEL,
      msg: { prompt: nudge.message, resumeSessionId: nudge.sessionId },
      effectivePrompt: nudge.message,
      onOutcome: (outcome) => {
        clearTimeout(timer);
        if (!outcome.ok) console.error(`[nudger] session ${nudge.sessionId}: ${outcome.error}`);
        done();
      },
    }).catch((err) => {
      clearTimeout(timer);
      console.error(`[nudger] session ${nudge.sessionId} threw:`, err instanceof Error ? err.message : err);
      done();
    });
  });

  // Counted whether or not the turn reported success. A nudge that failed to start still consumed its slot;
  // retrying it immediately would be a tight loop against whatever refused it.
  await recordNudgeSent(nudge.id);
}

let timer: ReturnType<typeof setInterval> | null = null;

/**
 * Start the tick. Called once from `server.tsx`.
 *
 * One tick at a time — `running` guards against a slow tick overlapping the next, which would double-fire
 * a due nudge. `unref` so this never holds the process open on its own.
 */
export function startNudger(): void {
  if (timer) return;
  let running = false;

  timer = setInterval(async () => {
    if (running) return;
    running = true;
    try {
      for (const nudge of await dueNudges()) {
        console.log(`[nudger] session ${nudge.sessionId} — nudging (${nudge.sentCount + 1}/${nudge.maxCount})`);
        await fire(nudge);
      }
    } catch (err) {
      // A bad tick must not stop every later one.
      console.error('[nudger] tick failed:', err instanceof Error ? err.message : err);
    } finally {
      running = false;
    }
  }, TICK_MS);

  timer.unref?.();
  console.log('[nudger] armed — checking every 60s');
}