'use strict'

var has = require('hast-util-has-property')
var convert = require('hast-util-is-element/convert')
var toText = require('hast-util-to-text')
var wrapText = require('./wrap-text')

module.exports = findSelectedOptions

var option = convert('option')

function findSelectedOptions(h, node, properties) {
  var props = properties || node.properties
  var options = findOptions(node)
  var size = Math.min(parseInt(props.size, 10), 0) || (props.multiple ? 4 : 1)
  var index = -1
  var selectedOptions = []
  var values = []
  var option
  var list
  var content
  var label
  var value

  while (++index < options.length) {
    if (has(options[index], 'selected')) {
      selectedOptions.push(options[index])
    }
  }

  list = selectedOptions.length ? selectedOptions : options
  options = list.slice(0, size)
  index = -1

  while (++index < options.length) {
    option = options[index]
    content = wrapText(h, toText(option))
    label = content || option.properties.label
    value = option.properties.value || content

    values.push([value, label === value ? null : label])
  }

  return values
}

function findOptions(node) {
  var children = node.children
  var index = -1
  var results = []
  var child

  while (++index < children.length) {
    child = children[index]

    if (option(child)) {
      if (!has(child, 'disabled')) {
        results.push(child)
      }
    } else if (child.children) {
      results = results.concat(findOptions(child))
    }
  }

  return results
}