import type { NewMessage } from './types.js';

// Guard against "phantom notification" dead-end finals.
//
// Agents sometimes end a turn with a sentence like "I'll wait for the build to
// complete — I'll be notified", expecting a background-completion callback that
// this environment never delivers. The turn then simply ends and the user is
// left staring at that message forever (no watcher was registered, so nothing
// ever resumes). The claude-platform prompt already forbids this, but a prompt
// rule cannot reliably stop the model, so we also enforce it at delivery time:
// when a final looks like such a dead-end and no watcher is actually active, we
// append an explicit notice telling the user no notification is coming and to
// send a follow-up — turning a silent hang into an actionable prompt.

const PHANTOM_NOTIFICATION_PATTERNS: readonly RegExp[] = [
  // First-person promise of a callback that never arrives.
  /\bi['’]?\s*ll\s+be\s+notified\b/i,
  /\bi\s+will\s+be\s+notified\b/i,
  /\bi['’]?\s*m\s+(?:going to|gonna)\s+(?:wait|be notified)\b/i,
  // "wait for the build/compile/deploy to complete/finish"
  /\bwait(?:ing)?\s+for\s+the\s+[\w\s-]{0,40}?\bto\s+(?:complete|finish|be\s+done)\b/i,
  // "notified when it finishes/completes/is done"
  /\bnotified\s+when\s+[\w\s-]{0,40}?(?:finishes|completes|is\s+done)\b/i,
];

/**
 * True when `text` reads like a background-completion "I'll be notified"
 * dead-end. Conservative: matches the distinctive first-person phrasing rather
 * than any mention of waiting, to avoid annotating legitimate status reports.
 */
export function isPhantomNotificationDeadEnd(text: string): boolean {
  if (!text) return false;
  return PHANTOM_NOTIFICATION_PATTERNS.some((pattern) => pattern.test(text));
}

export const PHANTOM_NOTIFICATION_NOTICE =
  '\n\n[자동 안내] 이 환경에는 백그라운드 완료 알림이 없어서, 위처럼 "기다렸다가 알림을 받겠다"고 해도 실제로는 아무것도 다시 시작되지 않습니다. 감시 작업(watch_ci 등)도 등록되지 않았습니다. 계속 진행하려면 이 방에 메시지를 한 번 더 보내 주세요.';

const NOTICE_MARKER = '[자동 안내]';

/**
 * Returns `text` unchanged unless it is a phantom-notification dead-end AND no
 * watcher is active for the chat, in which case an explicit follow-up notice is
 * appended. Idempotent: never appends the notice twice. When a watcher IS
 * active the "I'll be notified" claim is legitimate, so the text is untouched.
 */
export function applyPhantomNotificationGuard(
  text: string,
  opts: { hasActiveWatcher: boolean },
): string {
  if (opts.hasActiveWatcher) return text;
  if (!isPhantomNotificationDeadEnd(text)) return text;
  if (text.includes(NOTICE_MARKER)) return text;
  return `${text}${PHANTOM_NOTIFICATION_NOTICE}`;
}

// ── Auto-continue after a phantom dead-end ────────────────────────────────
//
// When a non-paired turn dead-ends on a phantom "I'll be notified" final with no
// watcher, instead of just leaving a notice we re-invoke the agent once so it
// actually finishes the work in the foreground. A hard per-chat cap makes this
// safe: at most MAX_PHANTOM_AUTO_CONTINUES re-runs per phantom streak, so a model
// that keeps producing the dead-end can never spin the bot in a loop. The streak
// resets as soon as any clean (non-phantom) final is produced.

const MAX_PHANTOM_AUTO_CONTINUES = 1;
const phantomAutoContinueStreak = new Map<string, number>();

/** Corrective nudge injected (as an inbound instruction) before the re-run. */
export const PHANTOM_CONTINUE_NUDGE =
  '[시스템 자동 안내] 방금 실제 감시 작업(watch_ci 등)을 등록하지 않은 채 "기다렸다가 알림을 받겠다"는 식으로 응답을 끝냈습니다. 이 환경에는 백그라운드 완료 알림이 없어, 그대로 두면 아무것도 다시 시작되지 않습니다. 지금 바로 포그라운드에서 작업을 끝까지 진행해 실제 결과를 보고하세요. 정말 오래 걸리는 작업이면 watch_ci/schedule_task로 감시를 등록한 뒤 그 사실을 알려주세요. 다시는 "알림을 받겠다"며 끝내지 마세요.';

export type PhantomFinalOutcome =
  | { kind: 'clean'; text: string }
  | { kind: 'auto-continue'; text: string }
  | { kind: 'notice'; text: string };

/**
 * Decide what to do with a final that may be a phantom dead-end. Pure except for
 * the per-chat streak counter, which is the loop guard.
 *
 * - `clean`: not a dead-end (or a watcher is active) — deliver as-is; resets streak.
 * - `auto-continue`: dead-end, under the cap — deliver as-is, and the caller must
 *   re-invoke the agent once with PHANTOM_CONTINUE_NUDGE.
 * - `notice`: dead-end but the cap is exhausted (or auto-continue disabled) —
 *   deliver with the follow-up notice appended so the user isn't left hanging.
 */
export function resolvePhantomFinalOutcome(args: {
  chatJid: string;
  text: string;
  hasActiveWatcher: boolean;
  canAutoContinue: boolean;
}): PhantomFinalOutcome {
  const { chatJid, text, hasActiveWatcher, canAutoContinue } = args;
  if (hasActiveWatcher || !isPhantomNotificationDeadEnd(text)) {
    phantomAutoContinueStreak.delete(chatJid);
    return { kind: 'clean', text };
  }
  const prior = phantomAutoContinueStreak.get(chatJid) ?? 0;
  if (canAutoContinue && prior < MAX_PHANTOM_AUTO_CONTINUES) {
    phantomAutoContinueStreak.set(chatJid, prior + 1);
    return { kind: 'auto-continue', text };
  }
  return {
    kind: 'notice',
    text: applyPhantomNotificationGuard(text, { hasActiveWatcher: false }),
  };
}

/** Test-only: clear the per-chat auto-continue streak counters. */
export function _resetPhantomAutoContinueForTests(): void {
  phantomAutoContinueStreak.clear();
}

/**
 * Perform the auto-continue side effect after a final was delivered: inject the
 * corrective nudge as an inbound instruction and re-enqueue a turn so the agent
 * runs again and finishes the work. No-op unless the outcome was `auto-continue`
 * AND the final actually delivered. Returns true when it scheduled a re-run.
 *
 * Extracted from the delivery callback so the storeMessage → enqueueMessageCheck
 * path is unit-testable without standing up a full turn.
 */
export function scheduleAutoContinueForPhantomFinal(args: {
  outcomeKind: PhantomFinalOutcome['kind'];
  delivered: boolean;
  chatJid: string;
  groupFolder: string;
  runId: string;
  storeMessage: (message: NewMessage) => void;
  enqueueMessageCheck: (chatJid: string, groupFolder: string) => void;
}): boolean {
  if (args.outcomeKind !== 'auto-continue' || !args.delivered) {
    return false;
  }
  args.storeMessage({
    id: `phantom-continue-${args.runId}-${Date.now().toString(36)}`,
    chat_jid: args.chatJid,
    sender: 'ejclaw-system',
    sender_name: 'EJClaw',
    content: PHANTOM_CONTINUE_NUDGE,
    timestamp: new Date().toISOString(),
    is_from_me: false,
    is_bot_message: false,
    message_source_kind: 'ipc_injected_human',
  });
  args.enqueueMessageCheck(args.chatJid, args.groupFolder);
  return true;
}