// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
// Copyright Joyent and Node contributors. All rights reserved. MIT license.
// deno-lint-ignore-file

import { ERR_INVALID_ARG_VALUE } from "../errors.js";

function highWaterMarkFrom(options, isDuplex, duplexKey) {
    return options.highWaterMark != null
        ? options.highWaterMark
        : isDuplex
            ? options[duplexKey]
            : null;
}

function getDefaultHighWaterMark(objectMode) {
    return objectMode ? 16 : 16 * 1024;
}

function getHighWaterMark(state, options, duplexKey, isDuplex) {
    const hwm = highWaterMarkFrom(options, isDuplex, duplexKey);
    if (hwm != null) {
        if (!Number.isInteger(hwm) || hwm < 0) {
            const name = isDuplex ? `options.${duplexKey}` : "options.highWaterMark";
            throw new ERR_INVALID_ARG_VALUE(name, hwm);
        }
        return Math.floor(hwm);
    }

    // Default value
    return getDefaultHighWaterMark(state.objectMode);
}

export default {
    getHighWaterMark,
    getDefaultHighWaterMark,
};
export { getDefaultHighWaterMark, getHighWaterMark };