/// <reference types="crypto-js" />

const CryptoJSAesJson = {
    stringify: function (cipherParams: CryptoJS.lib.CipherParams) {
        const j = { ct: cipherParams.ciphertext.toString(CryptoJS.enc.Base64), iv: "", s: "" };
        if (cipherParams.iv) j.iv = cipherParams.iv.toString();
        if (cipherParams.salt) j.s = cipherParams.salt.toString();
        return JSON.stringify(j);
    },
    parse: function (jsonStr: string) {
        const j = JSON.parse(jsonStr);
        const cipherParams = CryptoJS.lib.CipherParams.create({
            ciphertext: CryptoJS.enc.Base64.parse(j.ct),
        });
        if (j.iv) cipherParams.iv = CryptoJS.enc.Hex.parse(j.iv);
        if (j.s) cipherParams.salt = CryptoJS.enc.Hex.parse(j.s);
        return cipherParams;
    },
};

/**
 * AES encrypt
 * @see /src/shim/Cipher.php
 * @param text
 * @param key
 * @returns
 */
function aesEncrypt(text: string, key: string | CryptoJS.lib.WordArray) {
    const enc = CryptoJS.AES.encrypt(JSON.stringify(text), key, {
        format: CryptoJSAesJson,
    }).toString();
    return base64_encode(enc);
}

/**
 * AES decrypt
 * @see /src/shim/Cipher.php
 * @param encrypted
 * @param key
 * @returns
 */
function aesDecrypt(encrypted: string, key: string | CryptoJS.lib.WordArray) {
    const dec = base64_decode(encrypted);
    return JSON.parse(
        CryptoJS.AES.decrypt(dec, key, {
            format: CryptoJSAesJson,
        }).toString(CryptoJS.enc.Utf8)
    );
}

if (typeof module != "undefined" && typeof module.exports != "undefined") {
    module.exports = {
        aesDecrypt,
        aesEncrypt,
    };
}