var endEvents = [
  'touchend'
]

module.exports = Tap

// default tap timeout in ms
Tap.timeout = 200

function Tap(callback, options) {
  options = options || {}
  // if the user holds his/her finger down for more than 200ms,
  // then it's not really considered a tap.
  // however, you can make this configurable.
  var timeout = options.timeout || Tap.timeout

  // to keep track of the original listener
  listener.handler = callback

  return listener

  // el.addEventListener('touchstart', listener)
  function listener(e1) {
    // tap should only happen with a single finger
    if (!e1.touches || e1.touches.length > 1) return

    var el = e1.target
    var context = this
    var args = arguments;

    var timeout_id = setTimeout(cleanup, timeout)

    el.addEventListener('touchmove', cleanup)

    endEvents.forEach(function (event) {
      el.addEventListener(event, done)
    })

    function done(e2) {
      // since touchstart is added on the same tick
      // and because of bubbling,
      // it'll execute this on the same touchstart.
      // this filters out the same touchstart event.
      if (e1 === e2) return

      cleanup()

      // already handled
      if (e2.defaultPrevented) return

      // overwrite these functions so that they all to both start and events.
      var preventDefault = e1.preventDefault
      var stopPropagation = e1.stopPropagation

      e1.stopPropagation = function () {
        stopPropagation.call(e1)
        stopPropagation.call(e2)
      }

      e1.preventDefault = function () {
        //preventDefault.call(e1)
        preventDefault.call(e2)
      }

      // calls the handler with the `end` event,
      // but i don't think it matters.
      callback.apply(context, args)
    }

    // cleanup end events
    // to cancel the tap, just run this early
    function cleanup(e2) {
      // if it's the same event as the origin,
      // then don't actually cleanup.
      // hit issues with this - don't remember
      if (e1 === e2) return

      clearTimeout(timeout_id)

      el.removeEventListener('touchmove', cleanup)

      endEvents.forEach(function (event) {
        el.removeEventListener(event, done)
      })
    }
  }
}