/** Node.js 20+, no dependencies. Run only on the store server. */
export class DidbanClient {
  #base; #key;
  constructor(baseUrl, apiKey) {
    const url = new URL(baseUrl);
    if (url.username || url.password || url.search || url.hash || url.pathname !== '/' ||
        !(url.protocol === 'https:' || url.protocol === 'http:' && ['127.0.0.1', 'localhost'].includes(url.hostname))) throw new Error('Use an HTTPS origin or localhost.');
    if (!/^db_(test|live)_[A-Za-z0-9_-]{43}$/.test(apiKey)) throw new Error('Invalid API key.');
    this.#base = url.origin; this.#key = apiKey;
  }
  createInvoice(requestId, amountRial, ttlMinutes = undefined, presentation = "hosted") {
    return this.#request('/api/v1/invoices', {request_id: requestId, amount_rial: amountRial, ttl_minutes: ttlMinutes, presentation});
  }
  getInvoice(id) {
    if (!/^[0-9a-f-]{36}$/.test(id)) throw new Error('Invalid invoice ID.');
    return this.#request('/api/v1/invoices/' + id);
  }
  getPaymentData(id) {
    if (!/^[0-9a-f-]{36}$/.test(id)) throw new Error('Invalid invoice ID.');
    return this.#request('/api/v1/invoices/' + id + '/payment-data');
  }
  getWallet() { return this.#request('/api/v1/wallet'); }
  async #request(path, body) {
    let response;
    try { response = await fetch(this.#base + path, {
      method: body === undefined ? 'GET' : 'POST', redirect: 'error', signal: AbortSignal.timeout(20000),
      headers: {Authorization: 'Bearer ' + this.#key, 'Content-Type': 'application/json', Accept: 'application/json'},
      body: body === undefined ? undefined : JSON.stringify(body),
    }); } catch { throw new Error('Connection failed; retry only with the same request_id.'); }
    if (!response.ok) throw new Error('Didban HTTP ' + response.status);
    return response.json();
  }
}