/* Any copyright is dedicated to the Public Domain.
 * http://creativecommons.org/publicdomain/zero/1.0/ */

/* This list allows pre-existing or 'unfixable' CSS issues to remain, while we
 * detect newly occurring issues in shipping CSS. It is a list of objects
 * specifying conditions under which an error should be ignored.
 *
 * Every property of the objects in it needs to consist of a regular expression
 * matching the offending error. If an object has multiple regex criteria, they
 * ALL need to match an error in order for that error not to cause a test
 * failure. */
let whitelist = [
  // CodeMirror is imported as-is, see bug 1004423.
  {sourceName: /codemirror\.css$/i,
   isFromDevTools: true},
  // The debugger uses cross-browser CSS.
  {sourceName: /devtools\/client\/debugger\/new\/debugger.css/i,
   isFromDevTools: true},
   // Reps uses cross-browser CSS.
   {sourceName: /devtools-client-shared\/components\/reps\/reps.css/i,
   isFromDevTools: true},
  // PDFjs is futureproofing its pseudoselectors, and those rules are dropped.
  {sourceName: /web\/viewer\.css$/i,
   errorMessage: /Unknown pseudo-class.*(fullscreen|selection)/i,
   isFromDevTools: false},
  // PDFjs rules needed for compat with other UAs.
  {sourceName: /web\/viewer\.css$/i,
   errorMessage: /Unknown property.*(appearance|user-select)/i,
   isFromDevTools: false},
  // Highlighter CSS uses a UA-only pseudo-class, see bug 985597.
  {sourceName: /highlighters\.css$/i,
   errorMessage: /Unknown pseudo-class.*moz-native-anonymous/i,
   isFromDevTools: true},
  // Responsive Design Mode CSS uses a UA-only pseudo-class, see Bug 1241714.
  {sourceName: /responsive-ua\.css$/i,
   errorMessage: /Unknown pseudo-class.*moz-dropdown-list/i,
   isFromDevTools: true},
  // UA-only media features.
  {sourceName: /\b(autocomplete-item|svg)\.css$/,
   errorMessage: /Expected media feature name but found \u2018-moz.*/i,
   isFromDevTools: false},

  {sourceName: /\b(contenteditable|EditorOverride|svg|forms|html|mathml|ua)\.css$/i,
   errorMessage: /Unknown pseudo-class.*-moz-/i,
   isFromDevTools: false},
  {sourceName: /\b(html|mathml|ua)\.css$/i,
   errorMessage: /Unknown property.*-moz-/i,
   isFromDevTools: false},
  // Reserved to UA sheets unless layout.css.overflow-clip-box.enabled flipped to true.
  {sourceName: /(?:res|gre-resources)\/forms\.css$/i,
   errorMessage: /Unknown property.*overflow-clip-box/i,
   isFromDevTools: false},
  // These variables are declared somewhere else, and error when we load the
  // files directly. They're all marked intermittent because their appearance
  // in the error console seems to not be consistent.
  {sourceName: /jsonview\/css\/general\.css$/i,
   intermittent: true,
   errorMessage: /Property contained reference to invalid variable.*color/i,
   isFromDevTools: true},
  {sourceName: /webide\/skin\/logs\.css$/i,
   intermittent: true,
   errorMessage: /Property contained reference to invalid variable.*color/i,
   isFromDevTools: true},
  {sourceName: /webide\/skin\/logs\.css$/i,
   intermittent: true,
   errorMessage: /Property contained reference to invalid variable.*background/i,
   isFromDevTools: true},
  {sourceName: /devtools\/skin\/animationinspector\.css$/i,
   intermittent: true,
   errorMessage: /Property contained reference to invalid variable.*color/i,
   isFromDevTools: true},
];

if (!Services.prefs.getBoolPref("full-screen-api.unprefix.enabled")) {
  whitelist.push({
    sourceName: /(?:res|gre-resources)\/(ua|html)\.css$/i,
    errorMessage: /Unknown pseudo-class .*\bfullscreen\b/i,
    isFromDevTools: false
  });
}

let propNameWhitelist = [
  // These are CSS custom properties that we found a definition of but
  // no reference to.
  // Bug 1441837
  {propName: "--in-content-category-text-active",
   isFromDevTools: false},
  // Bug 1441929
  {propName: "--theme-search-overlays-semitransparent",
   isFromDevTools: true},
  // Bug 1441878
  {propName: "--theme-codemirror-gutter-background",
   isFromDevTools: true},
  // These custom properties are retrieved directly from CSSOM
  // in videocontrols.xml to get pre-defined style instead of computed
  // dimensions, which is why they are not referenced by CSS.
  {propName: "--clickToPlay-width",
   isFromDevTools: false},
  {propName: "--playButton-width",
   isFromDevTools: false},
  {propName: "--muteButton-width",
   isFromDevTools: false},
  {propName: "--castingButton-width",
   isFromDevTools: false},
  {propName: "--closedCaptionButton-width",
   isFromDevTools: false},
  {propName: "--fullscreenButton-width",
   isFromDevTools: false},
  {propName: "--durationSpan-width",
   isFromDevTools: false},
  {propName: "--durationSpan-width-long",
   isFromDevTools: false},
  {propName: "--positionDurationBox-width",
   isFromDevTools: false},
  {propName: "--positionDurationBox-width-long",
   isFromDevTools: false},
  // Used on Linux
  {propName: "--in-content-box-background-odd",
   platforms: ["win", "macosx"],
   isFromDevTools: false},

  // These properties *are* actually referenced. Need to find why
  // their reference isn't getting counted.
  {propName: "--bezier-diagonal-color",
   isFromDevTools: true},
  {propName: "--bezier-grid-color",
   isFromDevTools: true},
];

// Add suffix to stylesheets' URI so that we always load them here and
// have them parsed. Add a random number so that even if we run this
// test multiple times, it would be unlikely to affect each other.
const kPathSuffix = "?always-parse-css-" + Math.random();

function dumpWhitelistItem(item) {
  return JSON.stringify(item, (key, value) => {
    return value instanceof RegExp ? value.toString() : value;
  });
}

/**
 * Check if an error should be ignored due to matching one of the whitelist
 * objects defined in whitelist
 *
 * @param aErrorObject the error to check
 * @return true if the error should be ignored, false otherwise.
 */
function ignoredError(aErrorObject) {
  for (let whitelistItem of whitelist) {
    let matches = true;
    let catchAll = true;
    for (let prop of ["sourceName", "errorMessage"]) {
      if (whitelistItem.hasOwnProperty(prop)) {
        catchAll = false;
        if (!whitelistItem[prop].test(aErrorObject[prop] || "")) {
          matches = false;
          break;
        }
      }
    }
    if (catchAll) {
      ok(false, "A whitelist item is catching all errors. " +
         dumpWhitelistItem(whitelistItem));
      continue;
    }
    if (matches) {
      whitelistItem.used = true;
      let {sourceName, errorMessage} = aErrorObject;
      info(`Ignored error "${errorMessage}" on ${sourceName} ` +
           "because of whitelist item " + dumpWhitelistItem(whitelistItem));
      return true;
    }
  }
  return false;
}

var gChromeReg = Cc["@mozilla.org/chrome/chrome-registry;1"]
                 .getService(Ci.nsIChromeRegistry);
var gChromeMap = new Map();

var resHandler = Services.io.getProtocolHandler("resource")
                         .QueryInterface(Ci.nsIResProtocolHandler);
var gResourceMap = [];
function trackResourcePrefix(prefix) {
  let uri = Services.io.newURI("resource://" + prefix + "/");
  gResourceMap.unshift([prefix, resHandler.resolveURI(uri)]);
}
trackResourcePrefix("gre");
trackResourcePrefix("app");

function getBaseUriForChromeUri(chromeUri) {
  let chromeFile = chromeUri + "gobbledygooknonexistentfile.reallynothere";
  let uri = Services.io.newURI(chromeFile);
  let fileUri = gChromeReg.convertChromeURL(uri);
  return fileUri.resolve(".");
}

function parseManifest(manifestUri) {
  return fetchFile(manifestUri.spec).then(data => {
    for (let line of data.split("\n")) {
      let [type, ...argv] = line.split(/\s+/);
      if (type == "content" || type == "skin") {
        let chromeUri = `chrome://${argv[0]}/${type}/`;
        gChromeMap.set(getBaseUriForChromeUri(chromeUri), chromeUri);
      } else if (type == "resource") {
        trackResourcePrefix(argv[0]);
      }
    }
  });
}

function convertToCodeURI(fileUri) {
  let baseUri = fileUri;
  let path = "";
  while (true) {
    let slashPos = baseUri.lastIndexOf("/", baseUri.length - 2);
    if (slashPos <= 0) {
      // File not accessible from chrome protocol, try resource://
      for (let res of gResourceMap) {
        if (fileUri.startsWith(res[1]))
          return fileUri.replace(res[1], "resource://" + res[0] + "/");
      }
      // Give up and return the original URL.
      return fileUri;
    }
    path = baseUri.slice(slashPos + 1) + path;
    baseUri = baseUri.slice(0, slashPos + 1);
    if (gChromeMap.has(baseUri))
      return gChromeMap.get(baseUri) + path;
  }
}

function messageIsCSSError(msg) {
  // Only care about CSS errors generated by our iframe:
  if ((msg instanceof Ci.nsIScriptError) &&
      msg.category.includes("CSS") &&
      msg.sourceName.endsWith(kPathSuffix)) {
    let sourceName = msg.sourceName.slice(0, -kPathSuffix.length);
    let msgInfo = { sourceName, errorMessage: msg.errorMessage };
    // Check if this error is whitelisted in whitelist
    if (!ignoredError(msgInfo)) {
      ok(false, `Got error message for ${sourceName}: ${msg.errorMessage}`);
      return true;
    }
  }
  return false;
}

let imageURIsToReferencesMap = new Map();
let customPropsToReferencesMap = new Map();

function processCSSRules(sheet) {
  for (let rule of sheet.cssRules) {
    if (rule instanceof CSSMediaRule) {
      processCSSRules(rule);
      continue;
    }
    if (!(rule instanceof CSSStyleRule))
      continue;

    // Extract urls from the css text.
    // Note: CSSStyleRule.cssText always has double quotes around URLs even
    //       when the original CSS file didn't.
    let urls = rule.cssText.match(/url\("[^"]*"\)/g);
    let props = rule.cssText.match(/(var\()?(--[\w\-]+)/g);
    if (!urls && !props)
      continue;

    for (let url of (urls || [])) {
      // Remove the url(" prefix and the ") suffix.
      url = url.replace(/url\("(.*)"\)/, "$1");
      if (url.startsWith("data:"))
        continue;

      // Make the url absolute and remove the ref.
      let baseURI = Services.io.newURI(rule.parentStyleSheet.href);
      url = Services.io.newURI(url, null, baseURI).specIgnoringRef;

      // Store the image url along with the css file referencing it.
      let baseUrl = baseURI.spec.split("?always-parse-css")[0];
      if (!imageURIsToReferencesMap.has(url)) {
        imageURIsToReferencesMap.set(url, new Set([baseUrl]));
      } else {
        imageURIsToReferencesMap.get(url).add(baseUrl);
      }
    }

    for (let prop of (props || [])) {
      if (prop.startsWith("var(")) {
        prop = prop.substring(4);
        let prevValue = customPropsToReferencesMap.get(prop) || 0;
        customPropsToReferencesMap.set(prop, prevValue + 1);
      } else if (!customPropsToReferencesMap.has(prop)) {
        customPropsToReferencesMap.set(prop, undefined);
      }
    }
  }
}

function chromeFileExists(aURI) {
  let available = 0;
  try {
    let channel = NetUtil.newChannel({uri: aURI, loadUsingSystemPrincipal: true});
    let stream = channel.open();
    let sstream = Cc["@mozilla.org/scriptableinputstream;1"]
                    .createInstance(Ci.nsIScriptableInputStream);
    sstream.init(stream);
    available = sstream.available();
    sstream.close();
  } catch (e) {
    if (e.result != Cr.NS_ERROR_FILE_NOT_FOUND) {
      dump("Checking " + aURI + ": " + e + "\n");
      Cu.reportError(e);
    }
  }
  return available > 0;
}

add_task(async function checkAllTheCSS() {
  // Since we later in this test use Services.console.getMessageArray(),
  // better to not have some messages from previous tests in the array.
  Services.console.reset();

  let appDir = Services.dirsvc.get("GreD", Ci.nsIFile);
  // This asynchronously produces a list of URLs (sadly, mostly sync on our
  // test infrastructure because it runs against jarfiles there, and
  // our zipreader APIs are all sync)
  let uris = await generateURIsFromDirTree(appDir, [".css", ".manifest"]);

  // Create a clean iframe to load all the files into. This needs to live at a
  // chrome URI so that it's allowed to load and parse any styles.
  let testFile = getRootDirectory(gTestPath) + "dummy_page.html";
  let HiddenFrame = ChromeUtils.import("resource://testing-common/HiddenFrame.jsm", {}).HiddenFrame;
  let hiddenFrame = new HiddenFrame();
  let win = await hiddenFrame.get();
  let iframe = win.document.createElementNS("http://www.w3.org/1999/xhtml", "html:iframe");
  win.document.documentElement.appendChild(iframe);
  let iframeLoaded = BrowserTestUtils.waitForEvent(iframe, "load", true);
  iframe.contentWindow.location = testFile;
  await iframeLoaded;
  let doc = iframe.contentWindow.document;
  doc.docShell.cssErrorReportingEnabled = true;

  // Parse and remove all manifests from the list.
  // NOTE that this must be done before filtering out devtools paths
  // so that all chrome paths can be recorded.
  let manifestURIs = [];
  uris = uris.filter(uri => {
    if (uri.pathQueryRef.endsWith(".manifest")) {
      manifestURIs.push(uri);
      return false;
    }
    return true;
  });
  // Wait for all manifest to be parsed
  await throttledMapPromises(manifestURIs, parseManifest);

  // filter out either the devtools paths or the non-devtools paths:
  let isDevtools = SimpleTest.harnessParameters.subsuite == "devtools";
  let devtoolsPathBits = ["webide", "devtools"];
  uris = uris.filter(uri => isDevtools == devtoolsPathBits.some(path => uri.spec.includes(path)));

  let loadCSS = chromeUri => new Promise(resolve => {
    let linkEl, onLoad, onError;
    onLoad = e => {
      processCSSRules(linkEl.sheet);
      resolve();
      linkEl.removeEventListener("load", onLoad);
      linkEl.removeEventListener("error", onError);
    };
    onError = e => {
      ok(false, "Loading " + linkEl.getAttribute("href") + " threw an error!");
      resolve();
      linkEl.removeEventListener("load", onLoad);
      linkEl.removeEventListener("error", onError);
    };
    linkEl = doc.createElement("link");
    linkEl.setAttribute("rel", "stylesheet");
    linkEl.setAttribute("type", "text/css");
    linkEl.addEventListener("load", onLoad);
    linkEl.addEventListener("error", onError);
    linkEl.setAttribute("href", chromeUri + kPathSuffix);
    doc.head.appendChild(linkEl);
  });

  // We build a list of promises that get resolved when their respective
  // files have loaded and produced no errors.
  const kInContentCommonCSS = "chrome://global/skin/in-content/common.css";
  let allPromises = uris.map((uri) => convertToCodeURI(uri.spec))
                    .filter((uri) => uri !== kInContentCommonCSS);

  // Make sure chrome://global/skin/in-content/common.css is loaded before other
  // stylesheets in order to guarantee the --in-content variables can be
  // correctly referenced.
  if (allPromises.length !== uris.length) {
    await loadCSS(kInContentCommonCSS);
  }

  // Wait for all the files to have actually loaded:
  await throttledMapPromises(allPromises, loadCSS);

  // Check if all the files referenced from CSS actually exist.
  for (let [image, references] of imageURIsToReferencesMap) {
    if (!chromeFileExists(image)) {
      for (let ref of references) {
        ok(false, "missing " + image + " referenced from " + ref);
      }
    }
  }

  // Check if all the properties that are defined are referenced.
  for (let [prop, refCount] of customPropsToReferencesMap) {
    if (!refCount) {
      let ignored = false;
      for (let item of propNameWhitelist) {
        if (item.propName == prop &&
            isDevtools == item.isFromDevTools) {
          item.used = true;
          if (!item.platforms || item.platforms.includes(AppConstants.platform)) {
            ignored = true;
          }
          break;
        }
      }
      if (!ignored) {
        ok(false, "custom property `" + prop + "` is not referenced");
      }
    }
  }

  let messages = Services.console.getMessageArray();
  // Count errors (the test output will list actual issues for us, as well
  // as the ok(false) in messageIsCSSError.
  let errors = messages.filter(messageIsCSSError);
  is(errors.length, 0, "All the styles (" + allPromises.length + ") loaded without errors.");

  // Confirm that all whitelist rules have been used.
  function checkWhitelist(list) {
    for (let item of list) {
      if (!item.used && isDevtools == item.isFromDevTools &&
          (!item.platforms || item.platforms.includes(AppConstants.platform)) &&
          !item.intermittent) {
        ok(false, "Unused whitelist item: " + dumpWhitelistItem(item));
      }
    }
  }
  checkWhitelist(whitelist);
  checkWhitelist(propNameWhitelist);

  // Clean up to avoid leaks:
  iframe.remove();
  doc.head.innerHTML = "";
  doc = null;
  iframe = null;
  win = null;
  hiddenFrame.destroy();
  hiddenFrame = null;
  imageURIsToReferencesMap = null;
  customPropsToReferencesMap = null;
});
