/**
 *
 * Perform a swipe up on an element.
 *
 * @alias browser.swipeUp
 * @param {String} selector  element to swipe on
 * @param {Number=} yoffset    y offset of swipe gesture (in pixels or relative units)
 * @param {Number} speed     time (in seconds) to spend performing the swipe
 * @uses mobile/swipe
 * @type mobile
 *
 */

let swipeUp = function (selector, yOffset, speed) {
    /**
     * we can't use default values for function parameter here because this would
     * break the ability to chain the command with an element if reverse is used
     */
    yOffset = typeof yOffset === 'number' ? yOffset : -100
    speed = typeof speed === 'number' ? speed : 100

    /**
     * make sure yoffset is negative so we scroll down
     */
    yOffset = yOffset > 0 ? yOffset * -1 : yOffset

    return this.pause(100).swipe(selector, 0, yOffset, speed)
}

export default swipeUp