var setCookie = {exports: {}};

var defaultParseOptions = {
  decodeValues: true,
  map: false,
  silent: false,
};

function isNonEmptyString(str) {
  return typeof str === "string" && !!str.trim();
}

function parseString(setCookieValue, options) {
  var parts = setCookieValue.split(";").filter(isNonEmptyString);
  var nameValue = parts.shift().split("=");
  var name = nameValue.shift();
  var value = nameValue.join("="); // everything after the first =, joined by a "=" if there was more than one part

  options = options
    ? Object.assign({}, defaultParseOptions, options)
    : defaultParseOptions;

  try {
    value = options.decodeValues ? decodeURIComponent(value) : value; // decode cookie value
  } catch (e) {
    console.error(
      "set-cookie-parser encountered an error while decoding a cookie with value '" +
        value +
        "'. Set options.decodeValues to false to disable this feature.",
      e
    );
  }

  var cookie = {
    name: name, // grab everything before the first =
    value: value,
  };

  parts.forEach(function (part) {
    var sides = part.split("=");
    var key = sides.shift().trimLeft().toLowerCase();
    var value = sides.join("=");
    if (key === "expires") {
      cookie.expires = new Date(value);
    } else if (key === "max-age") {
      cookie.maxAge = parseInt(value, 10);
    } else if (key === "secure") {
      cookie.secure = true;
    } else if (key === "httponly") {
      cookie.httpOnly = true;
    } else if (key === "samesite") {
      cookie.sameSite = value;
    } else {
      cookie[key] = value;
    }
  });

  return cookie;
}

function parse(input, options) {
  options = options
    ? Object.assign({}, defaultParseOptions, options)
    : defaultParseOptions;

  if (!input) {
    if (!options.map) {
      return [];
    } else {
      return {};
    }
  }

  if (input.headers && input.headers["set-cookie"]) {
    // fast-path for node.js (which automatically normalizes header names to lower-case
    input = input.headers["set-cookie"];
  } else if (input.headers) {
    // slow-path for other environments - see #25
    var sch =
      input.headers[
        Object.keys(input.headers).find(function (key) {
          return key.toLowerCase() === "set-cookie";
        })
      ];
    // warn if called on a request-like object with a cookie header rather than a set-cookie header - see #34, 36
    if (!sch && input.headers.cookie && !options.silent) {
      console.warn(
        "Warning: set-cookie-parser appears to have been called on a request object. It is designed to parse Set-Cookie headers from responses, not Cookie headers from requests. Set the option {silent: true} to suppress this warning."
      );
    }
    input = sch;
  }
  if (!Array.isArray(input)) {
    input = [input];
  }

  options = options
    ? Object.assign({}, defaultParseOptions, options)
    : defaultParseOptions;

  if (!options.map) {
    return input.filter(isNonEmptyString).map(function (str) {
      return parseString(str, options);
    });
  } else {
    var cookies = {};
    return input.filter(isNonEmptyString).reduce(function (cookies, str) {
      var cookie = parseString(str, options);
      cookies[cookie.name] = cookie;
      return cookies;
    }, cookies);
  }
}

/*
  Set-Cookie header field-values are sometimes comma joined in one string. This splits them without choking on commas
  that are within a single set-cookie field-value, such as in the Expires portion.

  This is uncommon, but explicitly allowed - see https://tools.ietf.org/html/rfc2616#section-4.2
  Node.js does this for every header *except* set-cookie - see https://github.com/nodejs/node/blob/d5e363b77ebaf1caf67cd7528224b651c86815c1/lib/_http_incoming.js#L128
  React Native's fetch does this for *every* header, including set-cookie.

  Based on: https://github.com/google/j2objc/commit/16820fdbc8f76ca0c33472810ce0cb03d20efe25
  Credits to: https://github.com/tomball for original and https://github.com/chrusart for JavaScript implementation
*/
function splitCookiesString(cookiesString) {
  if (Array.isArray(cookiesString)) {
    return cookiesString;
  }
  if (typeof cookiesString !== "string") {
    return [];
  }

  var cookiesStrings = [];
  var pos = 0;
  var start;
  var ch;
  var lastComma;
  var nextStart;
  var cookiesSeparatorFound;

  function skipWhitespace() {
    while (pos < cookiesString.length && /\s/.test(cookiesString.charAt(pos))) {
      pos += 1;
    }
    return pos < cookiesString.length;
  }

  function notSpecialChar() {
    ch = cookiesString.charAt(pos);

    return ch !== "=" && ch !== ";" && ch !== ",";
  }

  while (pos < cookiesString.length) {
    start = pos;
    cookiesSeparatorFound = false;

    while (skipWhitespace()) {
      ch = cookiesString.charAt(pos);
      if (ch === ",") {
        // ',' is a cookie separator if we have later first '=', not ';' or ','
        lastComma = pos;
        pos += 1;

        skipWhitespace();
        nextStart = pos;

        while (pos < cookiesString.length && notSpecialChar()) {
          pos += 1;
        }

        // currently special character
        if (pos < cookiesString.length && cookiesString.charAt(pos) === "=") {
          // we found cookies separator
          cookiesSeparatorFound = true;
          // pos is inside the next cookie, so back up and return it.
          pos = nextStart;
          cookiesStrings.push(cookiesString.substring(start, lastComma));
          start = pos;
        } else {
          // in param ',' or param separator ';',
          // we continue from that comma
          pos = lastComma + 1;
        }
      } else {
        pos += 1;
      }
    }

    if (!cookiesSeparatorFound || pos >= cookiesString.length) {
      cookiesStrings.push(cookiesString.substring(start, cookiesString.length));
    }
  }

  return cookiesStrings;
}

setCookie.exports = parse;
setCookie.exports.parse = parse;
setCookie.exports.parseString = parseString;
var splitCookiesString_1 = setCookie.exports.splitCookiesString = splitCookiesString;

/** @param {import('http').IncomingMessage} req */
function get_raw_body(req) {
	const h = req.headers;

	if (!h['content-type']) {
		return null;
	}

	const length = Number(h['content-length']);

	// check if no request body
	// https://github.com/jshttp/type-is/blob/c1f4388c71c8a01f79934e68f630ca4a15fffcd6/index.js#L81-L95
	if (isNaN(length) && h['transfer-encoding'] == null) {
		return null;
	}

	if (req.destroyed) {
		const readable = new ReadableStream();
		readable.cancel();
		return readable;
	}

	let size = 0;
	let cancelled = false;

	return new ReadableStream({
		start(controller) {
			req.on('error', (error) => {
				controller.error(error);
			});

			req.on('end', () => {
				if (cancelled) return;
				controller.close();
			});

			req.on('data', (chunk) => {
				if (cancelled) return;

				size += chunk.length;
				if (size > length) {
					controller.error(new Error('content-length exceeded'));
					return;
				}

				controller.enqueue(chunk);

				if (controller.desiredSize === null || controller.desiredSize <= 0) {
					req.pause();
				}
			});
		},

		pull() {
			req.resume();
		},

		cancel(reason) {
			cancelled = true;
			req.destroy(reason);
		}
	});
}

/** @type {import('@sveltejs/kit/node').getRequest} */
async function getRequest(base, req) {
	let headers = /** @type {Record<string, string>} */ (req.headers);
	if (req.httpVersionMajor === 2) {
		// we need to strip out the HTTP/2 pseudo-headers because node-fetch's
		// Request implementation doesn't like them
		// TODO is this still true with Node 18
		headers = Object.assign({}, headers);
		delete headers[':method'];
		delete headers[':path'];
		delete headers[':authority'];
		delete headers[':scheme'];
	}

	return new Request(base + req.url, {
		method: req.method,
		headers,
		body: get_raw_body(req)
	});
}

/** @type {import('@sveltejs/kit/node').setResponse} */
async function setResponse(res, response) {
	const headers = Object.fromEntries(response.headers);

	if (response.headers.has('set-cookie')) {
		const header = /** @type {string} */ (response.headers.get('set-cookie'));
		const split = splitCookiesString_1(header);

		// @ts-expect-error
		headers['set-cookie'] = split;
	}

	res.writeHead(response.status, headers);

	if (!response.body) {
		res.end();
		return;
	}

	const reader = response.body.getReader();

	if (res.destroyed) {
		reader.cancel();
		return;
	}

	const cancel = (/** @type {Error|undefined} */ error) => {
		res.off('close', cancel);
		res.off('error', cancel);

		// If the reader has already been interrupted with an error earlier,
		// then it will appear here, it is useless, but it needs to be catch.
		reader.cancel(error).catch(() => {});
		if (error) res.destroy(error);
	};

	res.on('close', cancel);
	res.on('error', cancel);

	next();
	async function next() {
		try {
			for (;;) {
				const { done, value } = await reader.read();

				if (done) break;

				if (!res.write(value)) {
					res.once('drain', next);
					return;
				}
			}
			res.end();
		} catch (error) {
			cancel(error instanceof Error ? error : new Error(String(error)));
		}
	}
}

export { getRequest, setResponse };