import { BackendSettings, Config } from "../types/config";
import { Notification } from "../types/notification";

export abstract class Backend<C extends BackendSettings> {
  public abstract readonly name: string;
  protected abstract requiredFields: readonly (keyof C)[];
  protected abstract notify(config: C, notification: Notification): void;

  #validate(config: Partial<C>): C {
    for (const field of this.requiredFields) {
      if (config[field] === undefined) {
        throw new Error(`The '${String(field)}' configuration field of'${this.name}' consumer is required`)
      }
    }

    return config as C;
  }

  public remind(config: Config, notification: Notification) {
    const cfg = config.backend[this.name] as Partial<C>;

    if (cfg.enable !== true) {
      return
    }

    this.notify(this.#validate(cfg), notification);
  }
}