/**
 * Immutable log endpoint.
 *
 * GET /_emdash/api/immutable-log?limit=&before= — the append-only billing
 * ledger merged with the admin audit trail, newest first. `before` is an
 * exclusive ISO-timestamp cursor. Admin-only.
 */

import type { APIRoute } from "astro";

import { requirePerm } from "#api/authorize.js";
import { apiError, handleError, unwrapResult } from "#api/error.js";
import { handleImmutableLog } from "#api/handlers/billing.js";

export const prerender = false;

export const GET: APIRoute = async ({ locals, url }) => {
	const { emdash, user } = locals;

	const denied = requirePerm(user, "settings:manage");
	if (denied) return denied;

	if (!emdash?.db) {
		return apiError("NOT_CONFIGURED", "EmDash is not initialized", 500);
	}

	const limitRaw = Number(url.searchParams.get("limit"));
	const limit = Number.isFinite(limitRaw) && limitRaw > 0 ? Math.floor(limitRaw) : undefined;
	const before = url.searchParams.get("before") ?? undefined;

	try {
		return unwrapResult(await handleImmutableLog(emdash.db, { limit, before }));
	} catch (error) {
		return handleError(error, "Failed to load log", "IMMUTABLE_LOG_ERROR");
	}
};