class EmailObfuscator {
  encodeEmail(email: string) {
    const key = this.getRandomCode(33, 330)
    let encodedString = key.toString(16)

    Array.from(email).forEach(item => encodedString += (item.charCodeAt(0) ^ key).toString(16))

    return encodedString
  }

  decodeEmail(encodedString: string) {
    let email = ''
    const key = parseInt(encodedString.substr(0, 2), 16)

    for (let n = 2; encodedString.length - n; n += 2) {
      const code = parseInt(encodedString.substr(n, 2), 16) ^ key
      email += String.fromCharCode(code)
    }

    return email
  }

  private getRandomCode(min: number, max: number) {
    return Math.floor(Math.random() * (max - min)) + min
  }
}