'use client';
import { ClientApiError } from './client-api';
import type { MultiSeriesResponse } from './types';

/**
 * Browser-side helpers for the platform widgets (download builder estimate, API explorer). Same-origin `/api/v1`.
 */
export async function getJson<T>(path: string, signal?: AbortSignal): Promise<T> {
  const res = await fetch(`/api/v1${path}`, { headers: { accept: 'application/json' }, signal });
  if (!res.ok) throw new ClientApiError(res.status, `API ${res.status}`);
  return (await res.json()) as T;
}

/** Raw request for the API explorer: returns status, elapsed ms, byte size and the parsed/pretty body. */
export async function rawRequest(path: string, signal?: AbortSignal): Promise<{ status: number; ms: number; bytes: number; text: string; json: unknown | null; contentType: string | null }> {
  const t0 = performance.now();
  const res = await fetch(path, { headers: { accept: 'application/json' }, signal });
  const text = await res.text();
  const ms = Math.round(performance.now() - t0);
  let json: unknown | null = null;
  try {
    json = JSON.parse(text);
  } catch {
    json = null;
  }
  return { status: res.status, ms, bytes: new TextEncoder().encode(text).length, text, json, contentType: res.headers.get('content-type') };
}

export const clientPlatform = {
  /** Series bundle for row estimates (≤ 20 countries × 12 indicators). */
  seriesBundle: (countries: string[], indicators: string[], q: { from?: number | null; to?: number | null } = {}, signal?: AbortSignal) => {
    const p = new URLSearchParams({ country: countries.join(','), indicator: indicators.join(',') });
    if (q.from != null) p.set('from', String(q.from));
    if (q.to != null) p.set('to', String(q.to));
    return getJson<MultiSeriesResponse>(`/series?${p.toString()}`, signal);
  },
};