import {Converter} from './converter';

export class ROT13Converter implements Converter {
  getDisplayname(): string {
    return 'Perform ROT-13';
  }

  getId(): string {
    return 'rot13';
  }

  convert(input: string): string {
    try {
      const inChars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
      const outChars = 'NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm';
      const translate = c => {
        const charIndex = inChars.indexOf(c);
        return charIndex > -1 ? outChars[charIndex] : c;
      };
      return input.split('').map(translate).join('');
    } catch (exception) {
      throw new Error('Could not perform ROT-13 conversion. Maybe corrupt input?');
    }
  }
}