/* 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/. */

var TrackingProtection = {
  // If the user ignores the doorhanger, we stop showing it after some time.
  MAX_INTROS: 20,
  PREF_ENABLED_GLOBALLY: "privacy.trackingprotection.enabled",
  PREF_ENABLED_IN_PRIVATE_WINDOWS: "privacy.trackingprotection.pbmode.enabled",
  enabledGlobally: false,
  enabledInPrivateWindows: false,
  container: null,
  content: null,
  icon: null,
  activeTooltipText: null,
  disabledTooltipText: null,

  init() {
    let $ = selector => document.querySelector(selector);
    this.container = $("#tracking-protection-container");
    this.content = $("#tracking-protection-content");
    this.icon = $("#tracking-protection-icon");

    this.updateEnabled();
    Services.prefs.addObserver(this.PREF_ENABLED_GLOBALLY, this, false);
    Services.prefs.addObserver(this.PREF_ENABLED_IN_PRIVATE_WINDOWS, this, false);

    this.activeTooltipText =
      gNavigatorBundle.getString("trackingProtection.icon.activeTooltip");
    this.disabledTooltipText =
      gNavigatorBundle.getString("trackingProtection.icon.disabledTooltip");

    this.enabledHistogramAdd(this.enabledGlobally);
    this.disabledPBMHistogramAdd(!this.enabledInPrivateWindows);
  },

  uninit() {
    Services.prefs.removeObserver(this.PREF_ENABLED_GLOBALLY, this);
    Services.prefs.removeObserver(this.PREF_ENABLED_IN_PRIVATE_WINDOWS, this);
  },

  observe() {
    this.updateEnabled();
  },

  get enabled() {
    return this.enabledGlobally ||
           (this.enabledInPrivateWindows &&
            PrivateBrowsingUtils.isWindowPrivate(window));
  },

  updateEnabled() {
    this.enabledGlobally =
      Services.prefs.getBoolPref(this.PREF_ENABLED_GLOBALLY);
    this.enabledInPrivateWindows =
      Services.prefs.getBoolPref(this.PREF_ENABLED_IN_PRIVATE_WINDOWS);
    this.container.hidden = !this.enabled;
  },

  enabledHistogramAdd(value) {
    if (PrivateBrowsingUtils.isWindowPrivate(window)) {
      return;
    }
    Services.telemetry.getHistogramById("TRACKING_PROTECTION_ENABLED").add(value);
  },

  disabledPBMHistogramAdd(value) {
    if (PrivateBrowsingUtils.isWindowPrivate(window)) {
      return;
    }
    Services.telemetry.getHistogramById("TRACKING_PROTECTION_PBM_DISABLED").add(value);
  },

  eventsHistogramAdd(value) {
    if (PrivateBrowsingUtils.isWindowPrivate(window)) {
      return;
    }
    Services.telemetry.getHistogramById("TRACKING_PROTECTION_EVENTS").add(value);
  },

  shieldHistogramAdd(value) {
    if (PrivateBrowsingUtils.isWindowPrivate(window)) {
      return;
    }
    Services.telemetry.getHistogramById("TRACKING_PROTECTION_SHIELD").add(value);
  },

  onSecurityChange(state, isSimulated) {
    if (!this.enabled) {
      return;
    }

    // Only animate the shield if the event was not fired directly from
    // the tabbrowser (due to a browser change).
    if (isSimulated) {
      this.icon.removeAttribute("animate");
    } else {
      this.icon.setAttribute("animate", "true");
    }

    let isBlocking = state & Ci.nsIWebProgressListener.STATE_BLOCKED_TRACKING_CONTENT;
    let isAllowing = state & Ci.nsIWebProgressListener.STATE_LOADED_TRACKING_CONTENT;

    if (isBlocking) {
      this.icon.setAttribute("tooltiptext", this.activeTooltipText);
      this.icon.setAttribute("state", "blocked-tracking-content");
      this.content.setAttribute("state", "blocked-tracking-content");

      // Open the tracking protection introduction panel, if applicable.
      if (this.enabledGlobally) {
        let introCount = gPrefService.getIntPref("privacy.trackingprotection.introCount");
        if (introCount < TrackingProtection.MAX_INTROS) {
          gPrefService.setIntPref("privacy.trackingprotection.introCount", ++introCount);
          gPrefService.savePrefFile(null);
          this.showIntroPanel();
        }
      }

      this.shieldHistogramAdd(2);
    } else if (isAllowing) {
      this.icon.setAttribute("tooltiptext", this.disabledTooltipText);
      this.icon.setAttribute("state", "loaded-tracking-content");
      this.content.setAttribute("state", "loaded-tracking-content");

      this.shieldHistogramAdd(1);
    } else {
      this.icon.removeAttribute("tooltiptext");
      this.icon.removeAttribute("state");
      this.content.removeAttribute("state");

      // We didn't show the shield
      this.shieldHistogramAdd(0);
    }

    // Telemetry for state change.
    this.eventsHistogramAdd(0);
  },

  disableForCurrentPage() {
    // Convert document URI into the format used by
    // nsChannelClassifier::ShouldEnableTrackingProtection.
    // Any scheme turned into https is correct.
    let normalizedUrl = Services.io.newURI(
      "https://" + gBrowser.selectedBrowser.currentURI.hostPort,
      null, null);

    // Add the current host in the 'trackingprotection' consumer of
    // the permission manager using a normalized URI. This effectively
    // places this host on the tracking protection allowlist.
    if (PrivateBrowsingUtils.isBrowserPrivate(gBrowser.selectedBrowser)) {
      PrivateBrowsingUtils.addToTrackingAllowlist(normalizedUrl);
    } else {
      Services.perms.add(normalizedUrl,
        "trackingprotection", Services.perms.ALLOW_ACTION);
    }

    // Telemetry for disable protection.
    this.eventsHistogramAdd(1);

    // Hide the control center.
    document.getElementById("identity-popup").hidePopup();

    BrowserReload();
  },

  enableForCurrentPage() {
    // Remove the current host from the 'trackingprotection' consumer
    // of the permission manager. This effectively removes this host
    // from the tracking protection allowlist.
    let normalizedUrl = Services.io.newURI(
      "https://" + gBrowser.selectedBrowser.currentURI.hostPort,
      null, null);

    if (PrivateBrowsingUtils.isBrowserPrivate(gBrowser.selectedBrowser)) {
      PrivateBrowsingUtils.removeFromTrackingAllowlist(normalizedUrl);
    } else {
      Services.perms.remove(normalizedUrl, "trackingprotection");
    }

    // Telemetry for enable protection.
    this.eventsHistogramAdd(2);

    // Hide the control center.
    document.getElementById("identity-popup").hidePopup();

    BrowserReload();
  },

  dontShowIntroPanelAgain() {
    // This function may be called in private windows, but it does not change
    // any preference unless Tracking Protection is enabled globally.
    if (this.enabledGlobally) {
      gPrefService.setIntPref("privacy.trackingprotection.introCount",
                              this.MAX_INTROS);
      gPrefService.savePrefFile(null);
    }
  },

  showIntroPanel: Task.async(function*() {
    let brandBundle = document.getElementById("bundle_brand");
    let brandShortName = brandBundle.getString("brandShortName");

    let openStep2 = () => {
      // When the user proceeds in the tour, adjust the counter to indicate that
      // the user doesn't need to see the intro anymore.
      this.dontShowIntroPanelAgain();

      let nextURL = Services.urlFormatter.formatURLPref("privacy.trackingprotection.introURL") +
                    "?step=2&newtab=true";
      switchToTabHavingURI(nextURL, true, {
        // Ignore the fragment in case the intro is shown on the tour page
        // (e.g. if the user manually visited the tour or clicked the link from
        // about:privatebrowsing) so we can avoid a reload.
        ignoreFragment: "whenComparingAndReplace",
      });
    };

    let buttons = [
      {
        label: gNavigatorBundle.getString("trackingProtection.intro.step1of3"),
        style: "text",
      },
      {
        callback: openStep2,
        label: gNavigatorBundle.getString("trackingProtection.intro.nextButton.label"),
        style: "primary",
      },
    ];

    let panelTarget = yield UITour.getTarget(window, "trackingProtection");
    UITour.initForBrowser(gBrowser.selectedBrowser, window);
    UITour.showInfo(window, panelTarget,
                    gNavigatorBundle.getString("trackingProtection.intro.title"),
                    gNavigatorBundle.getFormattedString("trackingProtection.intro.description2",
                                                        [brandShortName]),
                    undefined, buttons,
                    { closeButtonCallback: () => this.dontShowIntroPanelAgain() });
  }),
};
