export class HttpError extends Error {
  readonly status: number;

  constructor(status: number, message: string) {
    super(message);
    this.name = "HttpError";
    this.status = status;
  }
}

export class HttpClient {
  constructor(private readonly baseUrl: string) {}

  async get<T>(path: string): Promise<T> {
    return this.request<T>(path, { method: "GET" });
  }

  async post<T>(path: string, body?: unknown): Promise<T> {
    return this.request<T>(path, {
      method: "POST",
      body: body === undefined ? undefined : JSON.stringify(body),
    });
  }

  private async request<T>(path: string, init: RequestInit): Promise<T> {
    const response = await fetch(`${this.baseUrl}${path}`, {
      ...init,
      headers: {
        "Content-Type": "application/json",
        ...(init.headers || {}),
      },
    });

    if (!response.ok) {
      const message = await response.text();
      throw new HttpError(response.status, message || response.statusText);
    }

    return (await response.json()) as T;
  }
}