import queryString from 'query-string';

// Provide methods that allow tests to mock window.location

let windowLocation = window.location;

export function setWindowLocation(fakeLocation) {

windowLocation = fakeLocation;

}

export function resetWindowLocation() {

windowLocation = window.location;

}

export function hasQueryParam(name) {

const parsedParams = queryParams();

// can't call hasOwnProperty directly due to bug in query-string:

// https://github.com/sindresorhus/query-string/issues/50

return Object.prototype.hasOwnProperty.call(parsedParams, name);

}

/**

* Gets the URL querystring params.

* @param name {string=} Optionally pull a specific param.

* @return {object|string} Hash of params, or param string if `name` is specified.

*/

export function queryParams(name) {

const parsed = queryString.parse(windowLocation.search);

if (name) {

return parsed[name];

}

return parsed;

}

/**

* Updates a query parameter in the URL via pushState (i.e. doesn't force a

* reload).

* @param {string} param - Name of the query parameter to modify

* @param {string | undefined} value - New value (or undefined to remove)

* @param {boolean} useReplaceState - optional param if you wish to use replaceState

* instead of pushState

*/

export function updateQueryParam(param, value, useReplaceState = false) {

const newString = queryString.stringify({

...queryString.parse(windowLocation.search),

[param]: value,

});

let newLocation = windowLocation.pathname;

// Don't append ? unless we actually have a value

if (newString) {

newLocation += '?' + newString;

}

const method = useReplaceState ? 'replaceState' : 'pushState';

window.history[method](null, document.title, newLocation);

}

/**

* We have various cookies that we want to be environment specific. We accomplish

* this by tacking on the rack_env (unless we're in prod). This helper gets the

* appropriate cookie name

* @param {string} name - Base cookie name

* @returns {string} Actual cookie name, with the rack_env appended

*/

export function environmentSpecificCookieName(name) {

const rack_env = window.dashboard.rack_env;

if (rack_env === 'production') {

return name;

}

return `${name}_${rack_env}`;

}

/**

* Given a host name (e.g. studio.code.org) return the site's root domain

* (e.g. code.org). Useful for getting the domain on which we will set a cookie.

* @param {string} hostname - A host name

* @returns {string} The root domain name for the host name

*/

export function getRootDomainFromHostname(hostname) {

return hostname.split('.').slice(-2).join('.');

}