import logger from '@wdio/logger'

const log = logger('webdriverio')

/**
 *
 * Scroll within the browser viewport. Note that `x` and `y` coordinates are relative to the current
 * scroll positon, therefore `browser.scroll(0, 0)` is a non operation.
 *
 * <example>
    :scroll.js
    it('should demonstrate the scroll command', async () => {
        await browser.url('https://webdriver.io')

        console.log(await browser.execute(() => window.scrollY)) // returns 0
        await browser.scroll(0, 200)
        console.log(await browser.execute(() => window.scrollY)) // returns 200
    });
 * </example>
 *
 * @alias element.scroll
 * @param {number} [x=0]  horizontal scroll position (default: `0`)
 * @param {number} [y=0]  vertical scroll position (default: `0`)
 * @uses protocol/execute
 * @type utility
 *
 */
export function scroll (
    this: WebdriverIO.Browser,
    x = 0,
    y = 0
): Promise<void> {
    if (!x && !y) {
        log.warn('"scroll" command was called with no parameters, skipping execution')
        return Promise.resolve()
    }

    // Appium does not support the "wheel" action
    if (this.isMobile) {
        return this.execute((x, y) => window.scrollBy(x, y), x, y)
    }

    return this.action('wheel')
        .scroll({
            deltaX: x,
            deltaY: y,
            duration: 0
        })
        .perform()
}