import { windowParams, clampLimit, clampOffset, SORTABLE_KEYS } from "./query.js";

// Enums are rejected when present-but-invalid (400); numeric/date params are
// leniently clamped so an odd page size still returns sensible data.

const TYPES = ["core", "audit"];
const DIRS = ["asc", "desc"];
const UUID_RE = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;

export const isUuid = (s) => typeof s === "string" && UUID_RE.test(s);

export function parseWindow(query = {}) {
  return windowParams(query);
}

const MAX_VERIFY_TARGETS = 200;

const splitList = (v) => (typeof v === "string" ? v.split(",") : []).map((s) => s.trim()).filter(Boolean);

// `ids` are event UUIDs (core tab); `auditIds` are audit records (audit tab,
// where rows share an event UUID). The cap applies to both lists combined.
export function parseVerifyTargets(query = {}) {
  const eventUuids = [...new Set(splitList(query.ids).filter(isUuid))].slice(0, MAX_VERIFY_TARGETS);
  const auditIds = [...new Set(splitList(query.auditIds).map(Number))]
    .filter((n) => Number.isInteger(n) && n > 0)
    .slice(0, Math.max(0, MAX_VERIFY_TARGETS - eventUuids.length));
  return { eventUuids, auditIds };
}

export function parseTransactionsQuery(query = {}) {
  const type = query.type ?? "core";
  if (!TYPES.includes(type)) {
    return { ok: false, error: `type must be one of ${TYPES.join(", ")}` };
  }

  let sort = query.sort;
  if (sort != null && !SORTABLE_KEYS.includes(sort)) {
    return { ok: false, error: `sort must be one of ${SORTABLE_KEYS.join(", ")}` };
  }
  if (sort == null) sort = undefined;

  const dir = query.dir ?? "desc";
  if (!DIRS.includes(dir)) {
    return { ok: false, error: `dir must be one of ${DIRS.join(", ")}` };
  }

  const { from, to } = windowParams(query);
  const q = typeof query.q === "string" ? query.q.slice(0, 200) : "";

  return {
    ok: true,
    value: {
      type,
      from,
      to,
      q,
      sort,
      dir,
      limit: clampLimit(query.limit),
      offset: clampOffset(query.offset),
    },
  };
}