// Small client for the other Google APIs storebound reads with the same Play service account: the Play Developer
// Reporting API (vitals) and Cloud Storage (Play statistics exports). Read-only callers; retries 429 / 5xx.
import { playServiceAccount } from '../lib/credentials';
import { tokenSource } from '../lib/google-auth';
import { errorBody } from '../lib/http';
import * as rt from '../lib/rt';

export const REPORTING_API = 'https://playdeveloperreporting.googleapis.com/v1beta1';

export function googleClient(root: string, scope: string) {
  const token = tokenSource(playServiceAccount(root), scope);
  async function send(method: string, url: string, body?: unknown): Promise<Response> {
    for (let attempt = 0; ; attempt++) {
      const r = await fetch(url, { method, headers: { Authorization: 'Bearer ' + (await token()), ...(body === undefined ? {} : { 'Content-Type': 'application/json' }) },
        body: body === undefined ? undefined : JSON.stringify(body) });
      if ((r.status === 429 || r.status >= 500) && attempt < 4) { await r.body?.cancel(); await rt.sleep(2000 * (attempt + 1)); continue; }
      return r;
    }
  }
  return {
    async json<T = unknown>(method: string, url: string, body?: unknown): Promise<T> {
      const r = await send(method, url, body);
      const t = await r.text();
      // path without the query: a long query string (errorIssues:search) pushed the API's reason out of tables
      if (!r.ok) throw new Error(`${method} ${url.replace(/^https:\/\/[^/]+/, '').replace(/\?.*$/, '')} -> ${r.status} ${errorBody(t, 800)}`);
      return (t ? JSON.parse(t) : {}) as T;
    },
    async bytes(url: string): Promise<Uint8Array> {
      const r = await send('GET', url);
      if (!r.ok) throw new Error(`GET ${url.replace(/^https:\/\/[^/]+/, '').replace(/\?.*$/, '')} -> ${r.status} ${errorBody(await r.text(), 300)}`);
      return new Uint8Array(await r.arrayBuffer());
    },
  };
}