var toMarkdown = require('to-markdown')

function debounce(fn, wait) {
  var timeout
  return function() {
    clearTimeout(timeout)
    timeout = setTimeout(fn, wait)
  }
}

var value
var inputEl = document.getElementById('input')
var outputEl = document.getElementById('output')
var outputText = outputEl.appendChild(document.createTextNode(''))
var opt = {
  gfm: true,
  converters: [{
    filter: ['span', 'div', 'small', 'font'],
    replacement: function (content) {
      return content
    }
  },
  {
    filter: 'li',
    replacement: function (content, node) {
      content = content.replace(/^\s+/, '').replace(/\n/gm, '\n    ')
      var parent = node.parentNode
      var index = Array.prototype.indexOf.call(parent.children, node) + 1

      var prefix = /ol/i.test(parent.nodeName) ? index + '. ' : '- '
      return prefix + content
    }
  }]
}

inputEl.onkeydown = inputEl.onkeyup = debounce(function() {
  var newVal = inputEl.innerHTML
  if (value == newVal) return
  value = newVal
  outputText.nodeValue = toMarkdown(value, opt)
})