import {encode, decode} from "js-base64"

export function buildFetchOptions(method: string, options: any, bodyJson: string) {
    const fetchOptions = {...{ method: method }, ...options};
    fetchOptions.headers = {...options.headers};

    if (typeof XMLHttpRequest !== "undefined") {
        const descriptor = Object.getOwnPropertyDescriptor(XMLHttpRequest.prototype, "withCredentials");

        // in Cocos Creator, XMLHttpRequest.withCredentials is not writable, so make the fetch
        // polyfill avoid writing to it.
        if (!descriptor?.set) {
            fetchOptions.credentials = 'cocos-ignore'; // string value is arbitrary, cannot be 'omit' or 'include
        }
    }

    if(!Object.keys(fetchOptions.headers).includes("Accept")) {
      fetchOptions.headers["Accept"] = "application/json";
    }

    if(!Object.keys(fetchOptions.headers).includes("Content-Type")) {
      fetchOptions.headers["Content-Type"] = "application/json";
    }

	Object.keys(fetchOptions.headers).forEach((key: string) => {
      if (!fetchOptions.headers[key]) {
        delete fetchOptions.headers[key];
      }
    });

    if (bodyJson) {
        fetchOptions.body = bodyJson;
    }

    return fetchOptions;
}

export function b64EncodeUnicode(str:string) {
    return encode(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g,
        function toSolidBytes(_match:string, p1) {
            return String.fromCharCode(Number('0x' + p1));
        }));
}

export function b64DecodeUnicode(str: string) {
    return decodeURIComponent(decode(str).split('').map(function(c) {
        return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
    }).join(''));
}