import { MAX_PATCH_CACHE, PATCH_CACHE_TTL_MS } from "../constants.ts";

export type ApplyResult = { status: "clean" | "conflict"; output: string };
type Entry = { result: ApplyResult; expiresAt: number };
const cache = new Map<number, Entry>();

export const patchCache = {
    get: (id: number): ApplyResult | undefined => {
        const entry = cache.get(id);
        if (!entry) return undefined;
        if (entry.expiresAt <= Date.now()) {
            cache.delete(id);
            return undefined;
        }
        return entry.result;
    },
    set: (id: number, result: ApplyResult) => {
        if (cache.size >= MAX_PATCH_CACHE && !cache.has(id)) {
            cache.delete(cache.keys().next().value!);
        }
        cache.set(id, { result, expiresAt: Date.now() + PATCH_CACHE_TTL_MS });
    },
    invalidate: (id: number) => cache.delete(id),
};