export default class Trimlog {
  constructor({username, password}) {
    this.token = null;
    this.tokenExpiry = new Date(0);
    this.username = username;
    this.password = password;
  }

  async getLooseActivities() {
    return this.fetch("GET", "activities");
  }

  async getWorkouts() {
    return this.fetch("GET", `workouts?from=${new Date(Date.now() - 86400000 * 3).toISOString().slice(0, 10)}`);
  }

  async postWorkout(data) {
    return this.fetch("POST", "workouts", data);
  }

  async fetch(method, path, body) {
    if (new Date() > this.tokenExpiry) {
      await this.refreshToken();
    }

    const res = await fetch("https://i.stifred.dev/api/"+path, {
      method: method,
      headers: {
        "content-type": body ? "application/json" : void(0),
        "authorization": `Bearer ${this.token}`
      },
      body: body ? JSON.stringify(body) : void(0),
    })

    if (!res.ok) {
      throw new Error(res.statusText);
    }

    return (await res.json()).data;
  }

  async refreshToken() {
    const res = await fetch("https://stifred.auth.eu-west-1.amazoncognito.com/oauth2/token", {
      method: "POST",
      headers: {
        "content-type": "application/x-www-form-urlencoded",
        "authorization": `Basic ${Buffer.from(`${this.username}:${this.password}`).toString("base64")}`
      },
      body: "grant_type=client_credentials&scope=indigo/api",
    })
    const data = await res.json();

    this.token = data.access_token;
    this.tokenExpiry = new Date(Date.now() + (data.expires_in * 1000 * 0.95));
  }
}