const ms = require('ms');

const Now = require('../lib');

async function parsePlan(res) {
  let id;
  let until;

  const { subscription } = await res.json();

  if (subscription) {
    id = subscription.plan.id;

    if (subscription.cancel_at_period_end) {
      until = ms(
        new Date(subscription.current_period_end * 1000) - new Date(),
        { long: true }
      );
    }
  } else {
    id = 'oss';
  }

  return { id, until };
}

module.exports = class Plans extends Now {
  async getCurrent() {
    const res = await this._fetch('/www/user/plan');
    return parsePlan(res);
  }

  async set(plan) {
    const res = await this._fetch('/www/user/plan', {
      method: 'PUT',
      body: { plan }
    });

    if (res.ok) {
      return parsePlan(res);
    }

    const err = new Error(res.statusText);
    err.res = res;
    throw err;
  }
};