import { type BerReader, type BerWriter } from '../ber/index.js';
import { type SearchFilterValues } from '../SearchFilter.js';
import { SearchFilter } from '../SearchFilter.js';

import { Filter } from './Filter.js';

export interface PresenceFilterOptions {
  attribute?: string;
}

export class PresenceFilter extends Filter {
  public type: SearchFilterValues = SearchFilter.present;

  public attribute: string;

  public constructor(options: PresenceFilterOptions = {}) {
    super();
    this.attribute = options.attribute ?? '';
  }

  public override parseFilter(reader: BerReader): void {
    this.attribute = reader.buffer.subarray(0, reader.length).toString('utf8').toLowerCase();
    reader.offset += reader.length;
  }

  public override writeFilter(writer: BerWriter): void {
    for (let i = 0; i < this.attribute.length; i += 1) {
      writer.writeByte(this.attribute.charCodeAt(i));
    }
  }

  public override matches(objectToCheck: Record<string, string> = {}, strictAttributeCase?: boolean): boolean {
    const objectToCheckValue = this.getObjectValue(objectToCheck, this.attribute, strictAttributeCase);

    return typeof objectToCheckValue !== 'undefined';
  }

  public override toString(): string {
    return `(${this.escape(this.attribute)}=*)`;
  }
}