// ==UserScript==
// @name         Email Generator
// @version      0.1
// @description  Type in "/email in a text or textarea field and it will update it with a randomly generated username that goes through a relay.
// @author       You
// @grant        none
// @include      *
// ==/UserScript==

(function() {
  const tmClickAudio = new Audio('data:audio/wav;charset=utf-8;base64,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')

  const TMGenerate = {
    random: (length) => {
      let result = ""
      while (result.length < length) {
        result += (Math.random()).toString(36).substr(2)
      }
      return result.substr(0, length)
    },

    domain: (length) => {
      return document.domain.replace(/\.|www/g, '').substr(0, length)
    },

    email: () => {
      // TODO: update the format here to meet your needs
      const username = TMGenerate.random(8) + '.' + TMGenerate.domain(12);
      const domain = 'privaterelay.example.com'
      console.assert(username.length < 64);
      console.assert(domain.length < 250);
      return username + '@' + domain;
    }
  }

  class TMEmail {
    constructor(intervalLength = 1000) {
      this.active = document.body
      setInterval(() => this.onInterval(), intervalLength)
    }

    onInterval () {
      const current = document.activeElement;
      if (this.active !== current && current) {
        if (this.active.removeEventListener) {
          this.active.removeEventListener('keydown', this.onKeyDown)
        }
        this.active = current
        current.addEventListener('keydown', this.onKeyDown)
      }
    }

    onKeyDown (e) {
      const el = e.target;
      const value = el.value + e.key
      if (value === '/email') {
        e.preventDefault()
        tmClickAudio.play()
        el.value = TMGenerate.email()
      }
    }
  }

  new TMEmail()
})();