var matchHtmlRegExp = /["'&<>]/

function escapeHtml (string) {
  var str = '' + string
  var match = matchHtmlRegExp.exec(str)

  if (!match) {
    return str
  }

  var escape
  var html = ''
  var index = 0
  var lastIndex = 0

  for (index = match.index; index < str.length; index++) {
    switch (str.charCodeAt(index)) {
      case 34: // "
        escape = '&quot;'
        break
      case 38: // &
        escape = '&amp;'
        break
      case 39: // '
        escape = '&#39;'
        break
      case 60: // <
        escape = '&lt;'
        break
      case 62: // >
        escape = '&gt;'
        break
      default:
        continue
    }

    if (lastIndex !== index) {
      html += str.substring(lastIndex, index)
    }

    lastIndex = index + 1
    html += escape
  }

  return lastIndex !== index
    ? html + str.substring(lastIndex, index)
    : html
}

function template (str) {
  var strArr = [
    '<div class="request-headers">',
    '<table>',
    '{{ it.headers.forEach(function (header) { }}',
    '{{ var className = ""; }}',
    '{{ if(header.value == \'aproxy\' || header.name.toLowerCase() == \'x - combo - files\') { }}',
    '{{ className = \' class="aproxy"\'; }}',
    '{{ } }}',
    '<tr>',
    '<td>{{= header.name }}</td>',
    '<td{{= className }}>{{= header.value }}</td>',
    '</tr>',
    '{{ }); }}',
    '</table>',
    '</div>'
  ]

  str = str || strArr.join('')

  var strFunc = 'var out = \'\'; out+=' + '\'' +
    str.replace(/[\r\t\n]/g, ' ')
      .replace(/'(?=[^}]*}})/g, '\t')
      .split('\'').join('\\\'')
      .split('\t').join('\'')
      .replace(/{{=(.+?)}}/g, '\'; out += $1; out += \'')
      .split('{{').join('\';')
      .split('}}').join('out+=\'') + '\'; return out;'

  var fn = new Function('it', strFunc)

  return {
    render: function (data) {
      return fn(data || {})
    }
  }
}

importScripts('../js/prism.js', '../js/codebeautify.js')

self.onmessage = function (event) {
  var data = event.data
  var url = data.url
  var type = data.type
  var content = data.content
  var contentType = data.contentType
  var headersData = data.headers || []
  var options = data.options
  var lang = data.language

  var indent = options.indent
  var isUnicode = options.unicode

  var bugFree = options.bugFree
  var headers = options.headers
  var customCSS = options.customCSS

  var files = new Array(3)

  if (type === 'css' || type === 'html') {
    files[0] = 'html/preview.html'
  }

  if (bugFree) {
    files[1] = 'js/bugfree.js'
  }

  if (!contentType) {
    files[2] = url
  }

  Promise.all(files.map(function (url) {
    return url ? new Promise(function (resolve, reject) {
      var xhr = new XMLHttpRequest()

      xhr.overrideMimeType('text/plain; charset=utf-8');

      xhr.onload = function () {
        resolve(xhr.responseText)
      }
      xhr.onerror = function () {
        reject()
      }

      xhr.open('GET', url)
      xhr.send()
    }) : null
  })).then(function (contents) {
    var grammar, language, html
    var formated = ''
    var beautified = ''
    var lineRows = ''
    var isMarkdown = type === 'markdown'

    if (contents[2]) {
      content = contents[2]
    }

    try {
      switch (type) {
        case 'json':
          formated = JSON.stringify(JSON.parse(content), null, indent)

          language = 'javascript'
          grammar = Prism.languages.javascript

          break
        case 'js':
        case 'jsonp':
          formated = js_beautify(content, {
            indent_size: indent
          })

          language = 'javascript'
          grammar = Prism.languages.javascript

          break

        case 'css':
          formated = css_beautify(content, {
            indent_size: indent
          })

          language = 'css'
          grammar = Prism.languages.css

          break

        case 'html':
          formated = html_beautify(content, {
            indent_size: indent,
            max_preserve_newlines: 1
          })

          language = 'markup'
          grammar = Prism.languages.markup

          break

        case 'markdown':
          var renderer = new marked.Renderer()

          renderer.heading = function (text, level) {
            var escapedText = escapeHtml(text.replace(/\s+/g, ''))

            return '<h' + level + '><a id="' + escapedText + '" class="anchor" href="#' + escapedText +
              '"><span class="anchor-link"></span></a>' +
              text + '</h' + level + '>'
          }

          renderer.code = function (code, language) {
            var html

            if (language) {
              html = hljs.highlight(language, code, true).value
            } else {
              html = hljs.highlightAuto(code).value
            }

            return '<pre class="hljs"><code>' + html + '</code></pre>'
          }

          renderer.listitem = function (text) {
            if (/^\s*\[[x ]\]\s*/.test(text)) {
              text = text
                .replace(/^\s*\[\s*\]\s*/, '<input type="checkbox"> ')
                .replace(/^\s*\[x\]\s*/, '<input type="checkbox" checked> ')
              return '<li><label>' + text + '</label></li>'
            } else {
              return '<li>' + text + '</li>'
            }
          }

          marked.setOptions({
            renderer: renderer,
            breaks: true,
            pedantic: true,
            smartLists: true,
            smartypants: true
          })

          beautified = marked(content)

          break

        default:
          self.postMessage()
          return
      }

      if (bugFree && ['js', 'css'].indexOf(type) > -1) {
        var idx = +!lang.match('zh')

        formated = contents[1].split('233')[idx] + '\r\n' + formated
      }

      if (!isMarkdown) {
        beautified = Prism.highlight(formated, grammar, language, isUnicode)

        lineRows = '<span class="line-numbers-rows">'

        var lines = beautified.split('\n').length

        while (lines--) {
          lineRows += '<span></span>'
        }

        lineRows += '</span>'
      }

      html = '<div class="pretty-container">'

      html += '<' + (isMarkdown ? 'div' : 'pre') + ' class="language-pretty">'
      html += lineRows + beautified
      html += '</' + (isMarkdown ? 'div' : 'pre') + '>'

      if (headers && headersData.length && !isMarkdown) {
        html += template().render({
          headers: headersData
        })
      }

      if (type === 'css' || type === 'html') {
        html += contents[0]
      }

      if (customCSS) {
        html += '<style class="custom-css">\n' + customCSS + '\n</style>'
      }

      html += '</div>'

      self.postMessage(html)
    } catch (e) {
      self.postMessage()
    }
  }, function () {
    self.postMessage()
  })
}