/**
 * @file quips.ts
 * @description Sagi's personality: pools of short phrases keyed by pulse/mood
 *   (and greetings, pat reactions), read from the `settings:sagi.*` i18n arrays
 *   so they follow the UI language, plus a deterministic-by-injection picker.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */
/* =============================================================================
 * MODULE_GUIDE — extended in-file reference (comments only; safe to read, never executed)
 * =============================================================================
 * **Purpose:** Sagi is the optional on-screen mascot assistant — quips, intents, and lightweight event reactions layered above the dashboard chrome.
 *
 * ## Design constraints
 * - Local-first: no telemetry leaves the machine unless the user configures webhooks.
 * - Fail-safe hooks path on the server must never block Claude Code; UI mirrors that
 *   philosophy by degrading gracefully (empty states, stale badges, reconnect loops).
 * - Destructive flows stay behind explicit confirmation modals and server-side gates.
 * - Internationalization: user-visible strings belong in i18n JSON, not literals here.
 *
 * ## Remote data & SSH
 * Remote Data Sources let operators aggregate multiple machines. SSH entries describe
 * how to reach a peer dashboard; the global data scope (`dataScope.ts`) narrows every
 * scoped GET via `?sources=`. Health checks and import history surface in Settings.
 *
 * ## Internal dependencies
 * - `./brain`
 * - `../../i18n`
 *
 * ## Public surface
 * - `QuipKey` — exported API; see TSDoc on the symbol for behavior.
 * - `pickQuip` — exported API; see TSDoc on the symbol for behavior.
 * - `pickLine` — exported API; see TSDoc on the symbol for behavior.
 * - `greetingKey` — exported API; see TSDoc on the symbol for behavior.
 * - `ALL_QUIP_KEYS` — exported API; see TSDoc on the symbol for behavior.
 *
 * ## Testing pointers
 * - Prefer colocated `__tests__` with Vitest + Testing Library for UI.
 * - Server contract changes require `npm run test:server` and OpenAPI sync.
 *
 * ## Related docs
 * - `ARCHITECTURE.md` — hooks → API → SQLite → WebSocket → UI pipeline.
 * - `docs/API.md` — REST reference.
 * - `skills/file-headers/` — mandatory `@author` header policy.
 * ============================================================================= */
/* -----------------------------------------------------------------------------
 * EXPORT CATALOG — quick index of symbols defined below (documentation only).
 * -----------------------------------------------------------------------------
 * **QuipKey**
 *   Part of this module's public contract. Downstream imports should treat
 *   the signature and return type as stable unless release notes say otherwise.
 *   When behavior changes, update the `@file` overview and relevant tests.
 *
 * **pickQuip**
 *   Part of this module's public contract. Downstream imports should treat
 *   the signature and return type as stable unless release notes say otherwise.
 *   When behavior changes, update the `@file` overview and relevant tests.
 *
 * **ALL_QUIP_KEYS**
 *   Part of this module's public contract. Downstream imports should treat
 *   the signature and return type as stable unless release notes say otherwise.
 *   When behavior changes, update the `@file` overview and relevant tests.
 *
 * ----------------------------------------------------------------------------- */

import i18n from "../../i18n";
import type { Mood, SagiPulse } from "./brain";

export type QuipKey = NonNullable<SagiPulse> | Mood;

export const ALL_QUIP_KEYS: QuipKey[] = [
  // Pulses (event-driven, transient bubbles)
  "session_done",
  "session_start",
  "subagent_spawn",
  "waiting",
  "error",
  "run_done",
  // Moods (steady-state flavor)
  "disconnected",
  "worried",
  "stuck",
  "happy",
  "thinking",
  "watching",
  "sleeping",
  "idle",
];
const KNOWN = new Set<string>(ALL_QUIP_KEYS);

/**
 * Pick one line from an i18n string array under `settings:sagi.<path>`.
 * `rand` is injectable for deterministic tests. Returns "" for a missing or
 * empty pool (never throws).
 */
export function pickLine(
  path: string,
  rand: () => number = Math.random,
  vars?: Record<string, unknown>
): string {
  const pool = i18n.t(`settings:sagi.${path}`, { returnObjects: true, ...vars }) as unknown;
  if (!Array.isArray(pool) || pool.length === 0) return "";
  const i = Math.min(pool.length - 1, Math.max(0, Math.floor(rand() * pool.length)));
  const line = pool[i];
  return typeof line === "string" ? line : "";
}

/**
 * Pick a quip for a key, in the UI language. Returns "" only for an unknown
 * key (never throws).
 */
export function pickQuip(key: QuipKey, rand: () => number = Math.random): string {
  return KNOWN.has(key) ? pickLine(`quips.${key}`, rand) : "";
}

/** Which greeting pool fits the hour: morning 5–11, afternoon 12–17, evening 18–22, else night. */
export function greetingKey(hour: number): "morning" | "afternoon" | "evening" | "night" {
  if (hour >= 5 && hour < 12) return "morning";
  if (hour >= 12 && hour < 18) return "afternoon";
  if (hour >= 18 && hour < 23) return "evening";
  return "night";
}