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

var { classes: Cc, utils: Cu, interfaces: Ci, results: Cr } = Components;

ChromeUtils.import("resource://gre/modules/TelemetryController.jsm", this);
ChromeUtils.import("resource://gre/modules/TelemetryUtils.jsm", this);
ChromeUtils.import("resource://gre/modules/Services.jsm", this);
ChromeUtils.import("resource://gre/modules/PromiseUtils.jsm", this);
ChromeUtils.import("resource://gre/modules/FileUtils.jsm", this);
ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm", this);
ChromeUtils.import("resource://testing-common/httpd.js", this);
ChromeUtils.import("resource://gre/modules/AppConstants.jsm");

ChromeUtils.defineModuleGetter(this, "AddonTestUtils",
                               "resource://testing-common/AddonTestUtils.jsm");
ChromeUtils.defineModuleGetter(this, "OS",
                               "resource://gre/modules/osfile.jsm");
ChromeUtils.defineModuleGetter(this, "TelemetrySend",
                               "resource://gre/modules/TelemetrySend.jsm");
ChromeUtils.defineModuleGetter(this, "Log",
                               "resource://gre/modules/Log.jsm");
ChromeUtils.defineModuleGetter(this, "NetUtil",
                               "resource://gre/modules/NetUtil.jsm");

const gIsWindows = AppConstants.platform == "win";
const gIsMac = AppConstants.platform == "macosx";
const gIsAndroid = AppConstants.platform == "android";
const gIsLinux = AppConstants.platform == "linux";

const Telemetry = Services.telemetry;

const MILLISECONDS_PER_MINUTE = 60 * 1000;
const MILLISECONDS_PER_HOUR = 60 * MILLISECONDS_PER_MINUTE;
const MILLISECONDS_PER_DAY = 24 * MILLISECONDS_PER_HOUR;

const UUID_REGEX = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;

var gGlobalScope = this;

const PingServer = {
  _httpServer: null,
  _started: false,
  _defers: [ PromiseUtils.defer() ],
  _currentDeferred: 0,
  _logger: null,

  get port() {
    return this._httpServer.identity.primaryPort;
  },

  get started() {
    return this._started;
  },

  get _log() {
    if (!this._logger) {
      this._logger = Log.repository.getLoggerWithMessagePrefix("Toolkit.Telemetry", "PingServer::");
    }

    return this._logger;
  },

  registerPingHandler(handler) {
    const wrapped = wrapWithExceptionHandler(handler);
    this._httpServer.registerPrefixHandler("/submit/telemetry/", wrapped);
  },

  resetPingHandler() {
    this.registerPingHandler((request, response) => {
      let r = request;
      this._log.trace(`defaultPingHandler() - ${r.method} ${r.scheme}://${r.host}:${r.port}${r.path}`);
      let deferred = this._defers[this._defers.length - 1];
      this._defers.push(PromiseUtils.defer());
      deferred.resolve(request);
    });
  },

  start() {
    this._httpServer = new HttpServer();
    this._httpServer.start(-1);
    this._started = true;
    this.clearRequests();
    this.resetPingHandler();
  },

  stop() {
    return new Promise(resolve => {
      this._httpServer.stop(resolve);
      this._started = false;
    });
  },

  clearRequests() {
    this._defers = [ PromiseUtils.defer() ];
    this._currentDeferred = 0;
  },

  promiseNextRequest() {
    const deferred = this._defers[this._currentDeferred++];
    // Send the ping to the consumer on the next tick, so that the completion gets
    // signaled to Telemetry.
    return new Promise(r => Services.tm.dispatchToMainThread(() => r(deferred.promise)));
  },

  promiseNextPing() {
    return this.promiseNextRequest().then(request => decodeRequestPayload(request));
  },

  async promiseNextRequests(count) {
    let results = [];
    for (let i = 0; i < count; ++i) {
      results.push(await this.promiseNextRequest());
    }

    return results;
  },

  promiseNextPings(count) {
    return this.promiseNextRequests(count).then(requests => {
      return Array.from(requests, decodeRequestPayload);
    });
  },
};

/**
 * Decode the payload of an HTTP request into a ping.
 * @param {Object} request The data representing an HTTP request (nsIHttpRequest).
 * @return {Object} The decoded ping payload.
 */
function decodeRequestPayload(request) {
  let s = request.bodyInputStream;
  let payload = null;

  if (request.hasHeader("content-encoding") &&
      request.getHeader("content-encoding") == "gzip") {
    let observer = {
      buffer: "",
      onStreamComplete(loader, context, status, length, result) {
        // String.fromCharCode can only deal with 500,000 characters
        // at a time, so chunk the result into parts of that size.
        const chunkSize = 500000;
        for (let offset = 0; offset < result.length; offset += chunkSize) {
          this.buffer += String.fromCharCode.apply(String, result.slice(offset, offset + chunkSize));
        }
      }
    };

    let scs = Cc["@mozilla.org/streamConverters;1"]
              .getService(Ci.nsIStreamConverterService);
    let listener = Cc["@mozilla.org/network/stream-loader;1"]
                  .createInstance(Ci.nsIStreamLoader);
    listener.init(observer);
    let converter = scs.asyncConvertData("gzip", "uncompressed",
                                         listener, null);
    converter.onStartRequest(null, null);
    converter.onDataAvailable(null, null, s, 0, s.available());
    converter.onStopRequest(null, null, null);
    let unicodeConverter = Cc["@mozilla.org/intl/scriptableunicodeconverter"]
                    .createInstance(Ci.nsIScriptableUnicodeConverter);
    unicodeConverter.charset = "UTF-8";
    let utf8string = unicodeConverter.ConvertToUnicode(observer.buffer);
    utf8string += unicodeConverter.Finish();
    payload = JSON.parse(utf8string);
  } else {
    let bytes = NetUtil.readInputStream(s, s.available());
    payload = JSON.parse((new TextDecoder()).decode(bytes));
  }

  return payload;
}

function wrapWithExceptionHandler(f) {
  function wrapper(...args) {
    try {
      f(...args);
    } catch (ex) {
      if (typeof(ex) != "object") {
        throw ex;
      }
      dump("Caught exception: " + ex.message + "\n");
      dump(ex.stack);
      do_test_finished();
    }
  }
  return wrapper;
}

function loadAddonManager(...args) {
  AddonTestUtils.init(gGlobalScope);
  AddonTestUtils.overrideCertDB();
  createAppInfo(...args);

  // As we're not running in application, we need to setup the features directory
  // used by system add-ons.
  const distroDir = FileUtils.getDir("ProfD", ["sysfeatures", "app0"], true);
  AddonTestUtils.registerDirectory("XREAppFeat", distroDir);
  AddonTestUtils.awaitPromise(AddonTestUtils.overrideBuiltIns(
          {"system": ["tel-system-xpi@tests.mozilla.org"]}));
  return AddonTestUtils.promiseStartupManager();
}

function finishAddonManagerStartup() {
  Services.obs.notifyObservers(null, "test-load-xpi-database");
}

var gAppInfo = null;

function createAppInfo(ID = "xpcshell@tests.mozilla.org", name = "XPCShell",
                       version = "1.0", platformVersion = "1.0") {
  AddonTestUtils.createAppInfo(ID, name, version, platformVersion);
  gAppInfo = AddonTestUtils.appInfo;
}

// Fake the timeout functions for the TelemetryScheduler.
function fakeSchedulerTimer(set, clear) {
  let session = ChromeUtils.import("resource://gre/modules/TelemetrySession.jsm", {});
  session.Policy.setSchedulerTickTimeout = set;
  session.Policy.clearSchedulerTickTimeout = clear;
}

/* global TelemetrySession:false, TelemetryEnvironment:false, TelemetryController:false,
          TelemetryStorage:false, TelemetrySend:false, TelemetryReportingPolicy:false
 */

/**
 * Fake the current date.
 * This passes all received arguments to a new Date constructor and
 * uses the resulting date to fake the time in Telemetry modules.
 *
 * @return Date The new faked date.
 */
function fakeNow(...args) {
  const date = new Date(...args);
  const modules = [
    ChromeUtils.import("resource://gre/modules/TelemetrySession.jsm"),
    ChromeUtils.import("resource://gre/modules/TelemetryEnvironment.jsm"),
    ChromeUtils.import("resource://gre/modules/TelemetryController.jsm"),
    ChromeUtils.import("resource://gre/modules/TelemetryStorage.jsm"),
    ChromeUtils.import("resource://gre/modules/TelemetrySend.jsm"),
    ChromeUtils.import("resource://gre/modules/TelemetryReportingPolicy.jsm"),
  ];

  for (let m of modules) {
    m.Policy.now = () => date;
  }

  return new Date(date);
}

function fakeMonotonicNow(ms) {
  const m = ChromeUtils.import("resource://gre/modules/TelemetrySession.jsm", {});
  m.Policy.monotonicNow = () => ms;
  return ms;
}

// Fake the timeout functions for TelemetryController sending.
function fakePingSendTimer(set, clear) {
  let module = ChromeUtils.import("resource://gre/modules/TelemetrySend.jsm", {});
  let obj = Cu.cloneInto({set, clear}, module, {cloneFunctions: true});
  module.Policy.setSchedulerTickTimeout = obj.set;
  module.Policy.clearSchedulerTickTimeout = obj.clear;
}

function fakeMidnightPingFuzzingDelay(delayMs) {
  let module = ChromeUtils.import("resource://gre/modules/TelemetrySend.jsm", {});
  module.Policy.midnightPingFuzzingDelay = () => delayMs;
}

function fakeGeneratePingId(func) {
  let module = ChromeUtils.import("resource://gre/modules/TelemetryController.jsm", {});
  module.Policy.generatePingId = func;
}

function fakeCachedClientId(uuid) {
  let module = ChromeUtils.import("resource://gre/modules/TelemetryController.jsm", {});
  module.Policy.getCachedClientID = () => uuid;
}

// Return a date that is |offset| ms in the future from |date|.
function futureDate(date, offset) {
  return new Date(date.getTime() + offset);
}

function truncateToDays(aMsec) {
  return Math.floor(aMsec / MILLISECONDS_PER_DAY);
}

// Returns a promise that resolves to true when the passed promise rejects,
// false otherwise.
function promiseRejects(promise) {
  return promise.then(() => false, () => true);
}

// Generates a random string of at least a specific length.
function generateRandomString(length) {
  let string = "";

  while (string.length < length) {
    string += Math.random().toString(36);
  }

  return string.substring(0, length);
}

// Short-hand for retrieving the histogram with that id.
function getHistogram(histogramId) {
  return Telemetry.getHistogramById(histogramId);
}

// Short-hand for retrieving the snapshot of the Histogram with that id.
function getSnapshot(histogramId) {
  return Telemetry.getHistogramById(histogramId).snapshot();
}

// Helper for setting an empty list of Environment preferences to watch.
function setEmptyPrefWatchlist() {
  let TelemetryEnvironment =
    ChromeUtils.import("resource://gre/modules/TelemetryEnvironment.jsm").TelemetryEnvironment;
  return TelemetryEnvironment.onInitialized().then(() => {
    TelemetryEnvironment.testWatchPreferences(new Map());

  });
}

function histogramValueCount(histogramSnapshot) {
  return histogramSnapshot.counts.reduce((a, b) => a + b);
}

if (runningInParent) {
  // Set logging preferences for all the tests.
  Services.prefs.setCharPref("toolkit.telemetry.log.level", "Trace");
  // Telemetry archiving should be on.
  Services.prefs.setBoolPref(TelemetryUtils.Preferences.ArchiveEnabled, true);
  // Telemetry xpcshell tests cannot show the infobar.
  Services.prefs.setBoolPref(TelemetryUtils.Preferences.BypassNotification, true);
  // FHR uploads should be enabled.
  Services.prefs.setBoolPref(TelemetryUtils.Preferences.FhrUploadEnabled, true);
  // Many tests expect the shutdown and the new-profile to not be sent on shutdown
  // and will fail if receive an unexpected ping. Let's globally disable these features:
  // the relevant tests will enable these prefs when needed.
  Services.prefs.setBoolPref(TelemetryUtils.Preferences.ShutdownPingSender, false);
  Services.prefs.setBoolPref(TelemetryUtils.Preferences.ShutdownPingSenderFirstSession, false);
  Services.prefs.setBoolPref("toolkit.telemetry.newProfilePing.enabled", false);
  Services.prefs.setBoolPref(TelemetryUtils.Preferences.FirstShutdownPingEnabled, false);
  // Ensure browser experiments are also disabled, to avoid network activity
  // when toggling PREF_ENABLED.
  Services.prefs.setBoolPref("experiments.enabled", false);
  // Turn off Health Ping submission.
  Services.prefs.setBoolPref(TelemetryUtils.Preferences.HealthPingEnabled, false);

  // Non-unified Telemetry (e.g. Fennec on Android) needs the preference to be set
  // in order to enable Telemetry.
  if (Services.prefs.getBoolPref(TelemetryUtils.Preferences.Unified, false)) {
    Services.prefs.setBoolPref(TelemetryUtils.Preferences.OverridePreRelease, true);
  } else {
    Services.prefs.setBoolPref(TelemetryUtils.Preferences.TelemetryEnabled, true);
  }

  fakePingSendTimer((callback, timeout) => {
    Services.tm.dispatchToMainThread(() => callback());
  },
  () => {});

  // This gets imported via fakeNow();
  /* global TelemetrySend */
  registerCleanupFunction(() => TelemetrySend.shutdown());
}

TelemetryController.testInitLogging();

// Avoid timers interrupting test behavior.
fakeSchedulerTimer(() => {}, () => {});
// Make pind sending predictable.
fakeMidnightPingFuzzingDelay(0);
