// Generic save/file helpers.

bool save_utils_sort_string_case_insensitive(const string& in a, const string& in b) {
    return a.lower() < b.lower();
}

string[] list_files_with_extension(const string& in extension, const string& in directory = "") {
    string[] result;
    if (extension == "")
        return result;

    string dirPrefix = directory;
    if (dirPrefix != "" && dirPrefix.substr(dirPrefix.length() - 1) != "/") {
        dirPrefix += "/";
    }

    string[] @items = glob(dirPrefix + "*" + extension);
    if (@items is null)
        return result;

    for (uint itemIndex = 0; itemIndex < items.length(); itemIndex++) {
        string item = items[itemIndex];
        if (item.length() >= extension.length() && item.substr(item.length() - extension.length()) == extension) {
            result.insert_last(item);
        }
    }

    if (result.length() > 1) {
        result.sort(save_utils_sort_string_case_insensitive);
    }
    return result;
}

bool has_files_with_extension(const string& in extension, const string& in directory = "") {
    return list_files_with_extension(extension, directory).length() > 0;
}

string strip_file_extension(const string& in filename, const string& in extension) {
    if (extension != "" && filename.length() >= extension.length() &&
        filename.substr(filename.length() - extension.length()) == extension) {
        return filename.substr(0, filename.length() - extension.length());
    }
    return filename;
}

bool save_string_file(const string& in filename, const string& in data) {
    if (data.length() == 0) {
        return false;
    }

    file outFile;
    if (!outFile.open(filename, "wb")) {
        return false;
    }

    if (outFile.write(data) < data.length()) {
        outFile.close();
        return false;
    }

    outFile.close();
    return true;
}

bool read_string_file(const string& in filename, string& out data, const bool allowEmpty = false) {
    file inFile;
    if (!inFile.open(filename, "rb")) {
        return false;
    }

    data = inFile.read();
    inFile.close();
    return allowEmpty || data.length() > 0;
}

string encrypt_string_aes(const string& in rawData, const string& in key) {
    return string_aes_encrypt(rawData, key);
}

string decrypt_string_aes(const string& in encryptedData, const string& in key) {
    return string_aes_decrypt(encryptedData, key);
}

bool save_encrypted_file(const string& in filename, const string& in rawData, const string& in key) {
    string encryptedData = encrypt_string_aes(rawData, key);
    return save_string_file(filename, encryptedData);
}

bool read_encrypted_file(const string& in filename, const string& in key, string& out rawData,
                         const bool allowPlaintextFallback = true) {
    string encryptedData = "";
    if (!read_string_file(filename, encryptedData, false)) {
        return false;
    }

    rawData = decrypt_string_aes(encryptedData, key);
    if (rawData.length() == 0 && allowPlaintextFallback) {
        rawData = encryptedData;
    }

    return rawData.length() > 0;
}