import urijs, { QueryDataMap } from "urijs";

/**

* Join `url` with `baseUrl` if `url` is not an absolute (full) url string

*

* @export

* @param {string} url A full url string or a url path string (/a/b/c).

* @param {string} baseUrl A baseUrl used to generate a full url when a url path string is supplied via the `url` parameter.

* @param {QueryDataMap} [optionalQueries]

* @param {string[]} [allowedUrlHosts] Optional; when specify, the host of `url` parameter will only be used if it is included by this list.

* @returns

*/

export default function getAbsoluteUrl(

url: string,

baseUrl: string,

optionalQueries?: QueryDataMap,

allowedUrlHosts?: string[]

) {

const uri = urijs(url);

const urlHost = uri.host();

if (urlHost) {

// --- absolute url, return directly only if the urlHost is included by `allowedUrlHosts` (unless `allowedUrlHosts` is not supplied)

if (

!allowedUrlHosts ||

allowedUrlHosts.findIndex((item) => item === urlHost) !== -1

) {

return url;

}

}

// ignore url host of `host` if any and use `baseUrl` to create the final full url string

if (typeof baseUrl !== "string") {

baseUrl = "";

}

const baseUri = urijs(baseUrl);

const query = uri.search(true);

const mergedUri = baseUri.segmentCoded(

baseUri.segmentCoded().concat(uri.segmentCoded())

);

return mergedUri

.search({

...(query ? query : {}),

...(optionalQueries ? optionalQueries : {})

})

.toString();

}