import { env } from "cloudflare:workers";
import type { EditorContainer } from "./container-do";

/** Containers are opt-in per deployment (EDITOR_CONTAINERS=on) and then per session, by the user. */
export function containersEnabled(): boolean {
  return env.EDITOR_CONTAINERS === "on";
}

function positive(raw: string | undefined, fallback: number): number {
  const value = Number(raw);
  return Number.isFinite(value) && value > 0 ? value : fallback;
}

/** Session limits. The monthly allowance comes from the account's metering plan (compute.editor). */
export function containerLimits() {
  return {
    idleMinutes: positive(env.EDITOR_CONTAINER_IDLE_MINUTES, 15),
    capHours: positive(env.EDITOR_CONTAINER_CAP_HOURS, 8),
    /** Concurrent containers one account may run; keep well under the namespace's max_instances. */
    perAccount: positive(env.EDITOR_CONTAINERS_PER_ACCOUNT, 3),
  };
}

/** Containers are per (account, repo, branch): co-editors each get their own, billed to themselves. */
export function containerStub(accountId: string, repoId: string, branch: string): DurableObjectStub<EditorContainer> {
  return env.EDITOR_CONTAINER.getByName(`${accountId}:${repoId}:${branch}`);
}