/** Form collect + application/x-www-form-urlencoded. */

function bareSummonEncodeForm(pairs) {
  var out = []
  for (var i = 0; i < pairs.length; i++) {
    var n = pairs[i].name
    var v = pairs[i].value
    if (!n) continue
    out.push(
      encodeURIComponent(n) + '=' + encodeURIComponent(v == null ? '' : v)
    )
  }
  return out.join('&')
}

function bareSummonCollectForm(formNode) {
  var pairs = []
  var method = (
    (formNode.attrs && formNode.attrs.method) ||
    'get'
  ).toLowerCase()
  var action = (formNode.attrs && formNode.attrs.action) || ''
  function walk(n) {
    if (!n || n.type !== 'element') return
    var name = n.name
    var a = n.attrs || {}
    if (
      (name === 'input' || name === 'textarea' || name === 'select') &&
      a.name
    ) {
      var typ = (a.type || 'text').toLowerCase()
      if (
        typ === 'submit' ||
        typ === 'button' ||
        typ === 'image' ||
        typ === 'file'
      )
        return
      if (
        (typ === 'checkbox' || typ === 'radio') &&
        a.checked == null &&
        a.value === undefined
      ) {
        /* still include if checked attr present */
      }
      if (typ === 'checkbox' && a.checked === undefined && !('checked' in a))
        return
      if (typ === 'radio' && !('checked' in a)) return
      var val = a.value
      if (name === 'textarea') val = bareSummonTextContent(n)
      if (name === 'select') {
        val = a.value || ''
        var ch = n.children || []
        for (var i = 0; i < ch.length; i++) {
          if (ch[i].name === 'option' && 'selected' in (ch[i].attrs || {})) {
            val =
              ch[i].attrs.value != null
                ? ch[i].attrs.value
                : bareSummonTextContent(ch[i])
          }
        }
      }
      pairs.push({ name: a.name, value: val == null ? '' : String(val) })
    }
    var kids = n.children || []
    for (var k = 0; k < kids.length; k++) walk(kids[k])
  }
  walk(formNode)
  return {
    method: method === 'post' ? 'POST' : 'GET',
    action: action,
    pairs: pairs
  }
}

function bareSummonSubmitUrl(form, pageUrl) {
  var spec =
    typeof form.method === 'string' ? form : bareSummonCollectForm(form)
  var action = bareSummonResolveUrl(spec.action || pageUrl, pageUrl)
  if (!action) return null
  var q = bareSummonEncodeForm(spec.pairs)
  if (spec.method === 'GET') {
    var href = action.href.split('#')[0].split('?')[0]
    return {
      method: 'GET',
      url: href + (q ? '?' + q : ''),
      body: null
    }
  }
  return {
    method: 'POST',
    url: action.href,
    body: q,
    headers: { 'content-type': 'application/x-www-form-urlencoded' }
  }
}