(function() {

'use strict';

var EyesUtils = require('eyes.utils');

var EyesSDK = require('eyes.sdk');

var EyesSeleniumUtils = require('./EyesSeleniumUtils');

var PositionProvider = EyesSDK.PositionProvider,

ArgumentGuard = EyesUtils.ArgumentGuard;

/**

* @constructor

* @param {Logger} logger A Logger instance.

* @param {EyesWebDriver} executor

* @param {PromiseFactory} promiseFactory

* @augments PositionProvider

*/

function ScrollPositionProvider(logger, executor, promiseFactory) {

ArgumentGuard.notNull(logger, "logger");

ArgumentGuard.notNull(executor, "executor");

this._logger = logger;

this._driver = executor;

this._promiseFactory = promiseFactory;

}

ScrollPositionProvider.prototype = new PositionProvider();

ScrollPositionProvider.prototype.constructor = ScrollPositionProvider;

/**

* @returns {Promise<{x: number, y: number}>} The scroll position of the current frame.

*/

ScrollPositionProvider.prototype.getCurrentPosition = function () {

var that = this;

that._logger.verbose("getCurrentScrollPosition()");

return EyesSeleniumUtils.getCurrentScrollPosition(this._driver, this._promiseFactory).then(function (result) {

that._logger.verbose("Current position: ", result);

return result;

});

};

/**

* Go to the specified location.

* @param {{x: number, y: number}} location The position to scroll to.

* @returns {Promise<void>}

*/

ScrollPositionProvider.prototype.setPosition = function (location) {

var that = this;

that._logger.verbose("Scrolling to:", location);

return EyesSeleniumUtils.scrollTo(this._driver, location, this._promiseFactory).then(function () {

that._logger.verbose("Done scrolling!");

});

};

/**

* @returns {Promise<{width: number, height: number}>} The entire size of the container which the position is relative to.

*/

ScrollPositionProvider.prototype.getEntireSize = function () {

var that = this;

return EyesSeleniumUtils.getEntirePageSize(this._driver, this._promiseFactory).then(function (result) {

that._logger.verbose("Entire size: ", result);

return result;

});

};

/**

* @returns {Promise<{x: number, y: number}>}

*/

ScrollPositionProvider.prototype.getState = function () {

return this.getCurrentPosition();

};

/**

* @param {{x: number, y: number}} state The initial state of position

* @returns {Promise<void>}

*/

ScrollPositionProvider.prototype.restoreState = function (state) {

var that = this;

return this.setPosition(state).then(function () {

that._logger.verbose("Position restored.");

});

};

module.exports = ScrollPositionProvider;

}());