import Cookies from "js-cookie";

type HTTPMethod = "GET" | "POST" | "PUT" | "PATCH";

class APIError extends Error {
  constructor(message: string, public readonly errors: unknown) {
    super(message);
  }
}

async function request(
  method: HTTPMethod,
  endpoint: string,
  successStatus: number,
  data: any,
  authToken?: string
) {
  const init = {
    headers: new Headers(),
    method: method,
    body: JSON.stringify(data),
  };
  const csrfToken = Cookies.get("csrftoken");
  if (csrfToken != undefined) {
    init.headers.set("X-CSRFToken", csrfToken);
  }
  if (authToken != undefined) {
    init.headers.set("Authentication", authToken);
  }
  init.headers.set("Accept", "application/json");
  init.headers.set("Content-Type", "application/json");
  const response = await fetch(`/api/${endpoint}/`, init);
  if (response.status !== 204) {
    if (response.status === successStatus) {
      return await response.json();
    } else {
      throw new APIError(response.statusText, await response.json());
    }
  }
}

export class User {
  email: string | undefined;
  password: string | undefined;
  private username: string | null = null;
  private confidantEmail: string | null = null;
  isAuthenticated = false;
  private token = "";

  static async confirm(uid: string, token: string): Promise<void> {
    await request("POST", "users/activation", 204, { uid, token });
  }

  async login(): Promise<void> {
    const response = await request("POST", "token/login", 200, {
      email: this.email,
      password: this.password,
    });
    this.token = response.auth_token;
    this.isAuthenticated = true;
  }

  async save(): Promise<void> {
    await request(
      "PATCH",
      "users/me",
      200,
      {
        username: this.username,
      },
      this.token
    );
  }

  async signup(): Promise<void> {
    await request("POST", "users", 201, {
      email: this.email,
      password: this.password,
    });
  }
}