import fetch from 'node-fetch';

export default class Lndhub {
  constructor (baseUrl) {
    this.baseUrl = baseUrl;
  }

  async auth (username, password) {
    const payload = { "login": username, "password": password };

    const res = await fetch(`${this.baseUrl}/auth`, {
      method: 'post',
      body: JSON.stringify(payload),
      headers: { 'Content-Type': 'application/json' }
    });
    const data = await res.json();

    this.refreshToken = data.refresh_token;
    this.accessToken = data.access_token;
  }

  async reauth (refreshToken) {
    const payload = { "refresh_token": this.refreshToken };

    const res = await fetch(`${this.baseUrl}/auth`, {
      method: 'post',
      body: JSON.stringify(payload),
      headers: { 'Content-Type': 'application/json' }
    });
    const data = await res.json();

    this.accessToken = data.access_token;
  }

  async createInvoice (amount, description) {
    const payload = { amount, description };

    const res = await fetch(`${this.baseUrl}/v2/invoices`, {
      method: 'post',
      body: JSON.stringify(payload),
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${this.accessToken}`
      }
    });
    const data = await res.json();
    // TODO re-auth if token has expired

    return data;
  }

  async getInvoice (paymentHash) {
    const res = await fetch(`${this.baseUrl}/v2/invoices/${paymentHash}`, {
      method: 'get',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${this.accessToken}`
      }
    });
    const data = await res.json();
    // TODO re-auth if token has expired

    return data;
  }
}