'use strict';

const node_util = require('node:util');
const zlib = require('node:zlib');
const node_buffer = require('node:buffer');
const h3 = require('h3');

function _interopDefaultCompat (e) { return e && typeof e === 'object' && 'default' in e ? e.default : e; }

const zlib__default = /*#__PURE__*/_interopDefaultCompat(zlib);

function getAnyCompression(event) {
  const encoding = h3.getRequestHeader(event, "accept-encoding");
  if (encoding?.includes("br"))
    return "br";
  if (encoding?.includes("gzip"))
    return "gzip";
  if (encoding?.includes("deflate"))
    return "deflate";
  return void 0;
}
async function compress(event, response, method) {
  const compression = node_util.promisify(zlib__default[method === "br" ? "brotliCompress" : method]);
  const acceptsEncoding = h3.getRequestHeader(event, "accept-encoding")?.includes(
    method
  );
  if (acceptsEncoding && typeof response.body === "string") {
    h3.setResponseHeader(event, "Content-Encoding", method);
    h3.send(event, await compression(node_buffer.Buffer.from(response.body)));
  }
}
async function compressStream(event, response, method) {
  const stream = new Response(response.body).body;
  const acceptsEncoding = h3.getRequestHeader(event, "accept-encoding")?.includes(
    method
  );
  if (acceptsEncoding) {
    h3.setResponseHeader(event, "Content-Encoding", method);
    response.body = stream.pipeThrough(new CompressionStream(method));
  } else {
    response.body = stream;
  }
}

async function useGZipCompression(event, response) {
  await compress(event, response, "gzip");
}
async function useDeflateCompression(event, response) {
  await compress(event, response, "deflate");
}
async function useBrotliCompression(event, response) {
  await compress(event, response, "br");
}
async function useCompression(event, response) {
  const compression = getAnyCompression(event);
  if (compression)
    await compress(event, response, compression);
}

async function useGZipCompressionStream(event, response) {
  await compressStream(event, response, "gzip");
}
async function useDeflateCompressionStream(event, response) {
  await compressStream(event, response, "deflate");
}
async function useCompressionStream(event, response) {
  const compression = getAnyCompression(event);
  if (compression && compression !== "br")
    await compressStream(event, response, compression);
}

exports.useBrotliCompression = useBrotliCompression;
exports.useCompression = useCompression;
exports.useCompressionStream = useCompressionStream;
exports.useDeflateCompression = useDeflateCompression;
exports.useDeflateCompressionStream = useDeflateCompressionStream;
exports.useGZipCompression = useGZipCompression;
exports.useGZipCompressionStream = useGZipCompressionStream;