import { DateTime, Duration } from "luxon";

export default class Event {
  public summary: string;
  public description: string;
  public start: DateTime;
  public duration: Duration;

  public constructor(json_data: Record<string, string>) {
    this.summary = json_data["summary"];
    this.description = json_data["description"];
    this.start = DateTime.fromISO(json_data["dtstart"]);
    const end = DateTime.fromISO(json_data["dtend"]);

    this.duration = end.diff(this.start);
  }

  public get hash(): string {
    const str = JSON.stringify(this);

    // from https://gist.github.com/jlevy/c246006675becc446360a798e2b2d781
    let hash = 0;
    for (let i = 0; i < str.length; i++) {
      const char = str.charCodeAt(i);
      hash = (hash << 5) - hash + char;
      hash &= hash; // Convert to 32bit integer
    }
    return new Uint32Array([hash])[0].toString(36);
  }
}