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import { normalizeChatLimit } from "../../../core/chunks";
/**
* Pure core for the settings feature — zero DOM, zero effects, zero Svelte.
*
* The settings feature exposes FE-local, user-tunable settings. Currently the
* chat limit (max loaded chunks per conversation; the policy lives in
* `core/chunks/trim.ts`): this module is the view-model seam that parses +
* validates a typed value into a normalized limit, so the UI can disable submit
* and show an error on garbage input. The bound constants + normalization are
* OWNED by `core/chunks` (the single source of truth); this module never
* redefines them.
*/
// ── Injected port (consumer-defines-port; the composition root adapts the
// store's localStorage persistence to this shape). ──────────────────────────
/** Outcome of persisting a chat-limit setting. */
export type ChatLimitSaveResult =
| { readonly ok: true; readonly chatLimit: number }
| { readonly ok: false; readonly error: string };
export type SaveChatLimit = (value: number) => Promise<ChatLimitSaveResult>;
// ── chat-limit parse / validate ───────────────────────────────────────────────
/** Result of parsing a typed chat-limit string. */
export type ChatLimitParse =
| { readonly ok: true; readonly value: number }
| { readonly ok: false; readonly error: string };
/**
* Parse a typed chat-limit string into a normalized limit (floored + clamped to
* [MIN_CHAT_LIMIT, MAX_CHAT_LIMIT] via `normalizeChatLimit`). Empty or
* non-numeric input is an ERROR (so the UI can disable submit + message), NOT a
* silent default — the default only applies at boot for an unset key, never
* from user typing.
*/
export function parseChatLimit(raw: string): ChatLimitParse {
const trimmed = raw.trim();
if (trimmed.length === 0) {
return { ok: false, error: "Enter a number." };
}
const n = Number(trimmed);
if (!Number.isFinite(n)) {
return { ok: false, error: "Must be a number." };
}
return { ok: true, value: normalizeChatLimit(n) };
}
/**
* Whether saving `typed` would change the `current` chat limit. A no-op save
* (empty/invalid, or equal after normalization) should be disabled. This is the
* dirty-check for the input — it must NOT mutate or clamp, only compare.
*/
export function chatLimitChanged(typed: string, current: number): boolean {
const parsed = parseChatLimit(typed);
if (!parsed.ok) return false;
return parsed.value !== current;
}
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