/**
 *
 * Send a sequence of key strokes to an element.
 *
 * @param {String} ID              ID of a WebElement JSON object to route the command to
 * @param {String|String[]} value  The sequence of keys to type. An array must be provided. The server should flatten the array items to a single string to be typed.
 *
 * @see  https://w3c.github.io/webdriver/webdriver-spec.html#element-send-keys
 * @type protocol
 *
 */

import { UNICODE_CHARACTERS } from '../helpers/constants'
import { ProtocolError } from '../utils/ErrorHandler'

export default function elementIdValue (id, value) {
    let key = []

    if (typeof id !== 'string' && typeof id !== 'number') {
        throw new ProtocolError('number or type of arguments don\'t agree with elementIdValue protocol command')
    }

    /**
     * replace key with corresponding unicode character
     */
    if (typeof value === 'string') {
        key = checkUnicode(value)
    } else if (value instanceof Array) {
        for (let charSet of value) {
            key = key.concat(checkUnicode(charSet))
        }
    } else {
        throw new ProtocolError('number or type of arguments don\'t agree with elementIdValue protocol command')
    }

    return this.requestHandler.create(`/session/:sessionId/element/${id}/value`, {
        value: key, // json wire conform way: `['f', 'o', 'o']`
        text: key.join('') // webdriver conform way: `foo`
    })
}

/*!
 * check for unicode character or split string into literals
 * @param  {String} value  text
 * @return {Array}         set of characters or unicode symbols
 */
function checkUnicode (value) {
    return UNICODE_CHARACTERS.hasOwnProperty(value) ? [UNICODE_CHARACTERS[value]] : Array.from(value)
}