/**
 *
 *  Base64 encode / decode
 *  @see http://www.webtoolkit.info/
 *
 **/
var Base64 = {
    // private property
    _keyStr: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

    // public method for encoding
    encode: function (input) {
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;

        input = Base64._utf8_encode(input);

        while (i < input.length) {
            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);

            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;

            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }

            output =
                output +
                this._keyStr.charAt(enc1) +
                this._keyStr.charAt(enc2) +
                this._keyStr.charAt(enc3) +
                this._keyStr.charAt(enc4);
        }

        return output;
    },

    // public method for decoding
    decode: function (input) {
        var output = "";
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;

        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

        while (i < input.length) {
            enc1 = this._keyStr.indexOf(input.charAt(i++));
            enc2 = this._keyStr.indexOf(input.charAt(i++));
            enc3 = this._keyStr.indexOf(input.charAt(i++));
            enc4 = this._keyStr.indexOf(input.charAt(i++));

            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;

            output = output + String.fromCharCode(chr1);

            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }
        }

        output = Base64._utf8_decode(output);

        return output;
    },

    // private method for UTF-8 encoding
    _utf8_encode: function (string) {
        string = string.replace(/\r\n/g, "\n");
        var utftext = "";

        for (var n = 0; n < string.length; n++) {
            var c = string.charCodeAt(n);

            if (c < 128) {
                utftext += String.fromCharCode(c);
            } else if (c > 127 && c < 2048) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            } else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }
        }

        return utftext;
    },

    // private method for UTF-8 decoding
    _utf8_decode: function (utftext) {
        var string = "";
        var i = 0;
        var c = (c1 = c2 = 0);

        while (i < utftext.length) {
            c = utftext.charCodeAt(i);

            if (c < 128) {
                string += String.fromCharCode(c);
                i++;
            } else if (c > 191 && c < 224) {
                c2 = utftext.charCodeAt(i + 1);
                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                i += 2;
            } else {
                c2 = utftext.charCodeAt(i + 1);
                c3 = utftext.charCodeAt(i + 2);
                string += String.fromCharCode(
                    ((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63)
                );
                i += 3;
            }
        }

        return string;
    },
};

/**
 * base64 encoding
 * @param {string} str string raw
 */
function base64_encode(str) {
    // PROCESS
    //const encodedWord = CryptoJS.enc.Utf8.parse(str); // encodedWord Array object
    //const encoded = CryptoJS.enc.Base64.stringify(encodedWord); // string: 'NzUzMjI1NDE='
    const encoded = Base64.encode(str);
    return encoded;
}

/**
 * Check if base64 is valid
 * @param {string} str
 */
function base64_valid(str) {
    if (str == "" || str.trim() == "") {
        return false;
    }
    try {
        return btoa(atob(str)) == str;
    } catch (err) {
        return false;
    }
}

/**
 * base64 decoding
 * @param {string} str base64 string
 */
function base64_decode(str) {
    // PROCESS
    //const encodedWord = CryptoJS.enc.Base64.parse(str); // encodedWord via Base64.parse()
    //const decoded = CryptoJS.enc.Utf8.stringify(encodedWord); // decode encodedWord via Utf8.stringify() '75322541'
    const decoded = Base64.decode(str);
    return decoded;
}

function b64EncodeUnicode(str) {
    return btoa(
        encodeURIComponent(str).replace(/%([0-9A-F]{2})/g, function (match, p1) {
            return String.fromCharCode(parseInt(p1, 16));
        })
    );
}

function b64DecodeUnicode(str) {
    return decodeURIComponent(
        Array.prototype.map
            .call(atob(str), function (c) {
                return "%" + ("00" + c.charCodeAt(0).toString(16)).slice(-2);
            })
            .join("")
    );
}