/** zod helpers for query-string parameters (strings in → typed values out). */
import { z } from "zod";

const empty = (v: unknown) => (v === "" || v === null ? undefined : v);

export const numParam = z.preprocess((v) => { const x = empty(v); if (x === undefined) return undefined; const n = Number(x); return Number.isFinite(n) ? n : x; }, z.number().optional());
export const intParam = z.preprocess((v) => { const x = empty(v); if (x === undefined) return undefined; const n = Number(x); return Number.isFinite(n) ? Math.trunc(n) : x; }, z.number().int().optional());
export const boolParam = z.preprocess((v) => { const x = empty(v); if (x === undefined) return undefined; if (typeof x === "boolean") return x; const s = String(x).toLowerCase(); if (["1", "true", "yes", "y", "on"].includes(s)) return true; if (["0", "false", "no", "n", "off"].includes(s)) return false; return x; }, z.boolean().optional());
export const strParam = z.preprocess(empty, z.string().trim().max(300).optional());
export const csvParam = z.preprocess(empty, z.string().trim().max(1000).optional());
export const pageParam = z.preprocess((v) => { const x = empty(v); if (x === undefined) return 1; const n = Number(x); return Number.isFinite(n) && n >= 1 ? Math.trunc(n) : 1; }, z.number().int().min(1));

export const orderParam = z.preprocess(empty, z.enum(["asc", "desc"]).optional());

export const facilityFiltersSchema = z.object({
  q: strParam,
  country: csvParam,
  region: strParam,
  metro: strParam,
  operator: strParam,
  status: csvParam,
  type: csvParam,
  min_mw: numParam,
  max_mw: numParam,
  opened_from: intParam,
  opened_to: intParam,
  planned_from: intParam,
  planned_to: intParam,
  cloud: strParam,
  hyperscale: boolParam,
  colocation: boolParam,
  ai: boolParam,
  renewable: boolParam,
  has_mw: boolParam,
  has_geo: boolParam,
  confidence: csvParam,
  sort: z.preprocess(empty, z.enum(["name", "mw", "updated", "opened", "completeness"]).optional()),
  order: orderParam,
  page: pageParam,
  per_page: intParam,
});
export type FacilityFiltersInput = z.infer<typeof facilityFiltersSchema>;