/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

const {
  isFreetextMatch,
} = require("resource://devtools/client/netmonitor/src/utils/filter-text-utils.js");

/**
 * Predicates used when filtering items.
 *
 * @param object item
 *        The filtered item.
 * @return boolean
 *         True if the item should be visible, false otherwise.
 */
function all() {
  return true;
}

function isHtml({ mimeType }) {
  return (
    mimeType && (mimeType.includes("/html") || mimeType.includes("/xhtml+xml"))
  );
}

function isCss({ mimeType }) {
  return mimeType && mimeType.includes("/css");
}

function isJs({ mimeType }) {
  return (
    mimeType &&
    (mimeType.includes("/ecmascript") ||
      mimeType.includes("/javascript") ||
      mimeType.includes("/x-javascript"))
  );
}

function isXHR(item) {
  // Show the request it is XHR, except if the request is a WS upgrade
  return item.isXHR && !isWS(item);
}

function isFont({ url, mimeType }) {
  // Fonts are a mess.
  return (
    (mimeType && (mimeType.includes("font/") || mimeType.includes("/font"))) ||
    url.includes(".eot") ||
    url.includes(".ttf") ||
    url.includes(".otf") ||
    url.includes(".woff")
  );
}

function isImage({ mimeType, cause }) {
  // We check cause.type so anything loaded via "img", "imageset", "lazy-img", etc. is in the right category
  // When mimeType is not set to "image/", we still "detect" the image with cause.type (Bug-1654257)
  return (
    mimeType?.includes("image/") ||
    cause?.type.includes("img") ||
    cause?.type.includes("image")
  );
}

function isMedia({ mimeType }) {
  // Not including images.
  return (
    mimeType &&
    (mimeType.includes("audio/") ||
      mimeType.includes("video/") ||
      mimeType.includes("model/") ||
      mimeType === "application/vnd.apple.mpegurl" ||
      mimeType === "application/x-mpegurl" ||
      mimeType === "application/ogg")
  );
}

function isWS({ requestHeaders, responseHeaders, cause }) {
  // For the first call, the requestHeaders is not ready(empty),
  // so checking for cause.type instead (Bug-1454962)
  if (typeof cause.type === "string" && cause.type === "websocket") {
    return true;
  }
  // Detect a websocket upgrade if request has an Upgrade header with value 'websocket'
  if (!requestHeaders || !Array.isArray(requestHeaders.headers)) {
    return false;
  }

  // Find the 'upgrade' header.
  let upgradeHeader = requestHeaders.headers.find(header => {
    return header.name.toLowerCase() == "upgrade";
  });

  // If no header found on request, check response - mainly to get
  // something we can unit test, as it is impossible to set
  // the Upgrade header on outgoing XHR as per the spec.
  if (
    !upgradeHeader &&
    responseHeaders &&
    Array.isArray(responseHeaders.headers)
  ) {
    upgradeHeader = responseHeaders.headers.find(header => {
      return header.name.toLowerCase() == "upgrade";
    });
  }

  // Return false if there is no such header or if its value isn't 'websocket'.
  if (!upgradeHeader || upgradeHeader.value != "websocket") {
    return false;
  }

  return true;
}

function isOther(item) {
  const tests = [isHtml, isCss, isJs, isXHR, isFont, isImage, isMedia, isWS];
  return tests.every(is => !is(item));
}

module.exports = {
  Filters: {
    all,
    html: isHtml,
    css: isCss,
    js: isJs,
    xhr: isXHR,
    fonts: isFont,
    images: isImage,
    media: isMedia,
    ws: isWS,
    other: isOther,
  },
  isFreetextMatch,
};