/* 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/. */

const PREF_RESTORE_ON_DEMAND = "browser.sessionstore.restore_on_demand";

add_task(async function test() {
  Services.prefs.setBoolPref(PREF_RESTORE_ON_DEMAND, true);
  registerCleanupFunction(function () {
    Services.prefs.clearUserPref(PREF_RESTORE_ON_DEMAND);
  });

  let state = {
    windows: [
      {
        tabs: [
          {
            entries: [
              { url: "http://example.org", triggeringPrincipal_base64 },
            ],
            extData: { uniq: r() },
          },
          {
            entries: [
              { url: "http://example.org", triggeringPrincipal_base64 },
            ],
            extData: { uniq: r() },
          },
          {
            entries: [
              { url: "http://example.org", triggeringPrincipal_base64 },
            ],
            extData: { uniq: r() },
          },
          {
            entries: [
              { url: "http://example.org", triggeringPrincipal_base64 },
            ],
            extData: { uniq: r() },
          },
          {
            entries: [
              { url: "http://example.org", triggeringPrincipal_base64 },
            ],
            extData: { uniq: r() },
          },
          {
            entries: [
              { url: "http://example.org", triggeringPrincipal_base64 },
            ],
            extData: { uniq: r() },
          },
        ],
        selected: 1,
      },
    ],
  };

  let expectedCounts = [
    [5, 1, 0],
    [4, 1, 1],
    [3, 1, 2],
    [2, 1, 3],
    [1, 1, 4],
    [0, 1, 5],
  ];
  let tabOrder = [0, 5, 1, 4, 3, 2];

  let loadCount = 0;
  let promiseRestoringTabs = new Promise(resolve => {
    gProgressListener.setCallback(function (
      aBrowser,
      aNeedRestore,
      aRestoring,
      aRestored
    ) {
      loadCount++;
      let expected = expectedCounts[loadCount - 1];

      is(
        aNeedRestore,
        expected[0],
        "load " + loadCount + " - # tabs that need to be restored"
      );
      is(
        aRestoring,
        expected[1],
        "load " + loadCount + " - # tabs that are restoring"
      );
      is(
        aRestored,
        expected[2],
        "load " + loadCount + " - # tabs that has been restored"
      );

      if (loadCount < state.windows[0].tabs.length) {
        // double check that this tab was the right one
        let expectedData =
          state.windows[0].tabs[tabOrder[loadCount - 1]].extData.uniq;
        let tab;
        for (let i = 0; i < window.gBrowser.tabs.length; i++) {
          if (!tab && window.gBrowser.tabs[i].linkedBrowser == aBrowser) {
            tab = window.gBrowser.tabs[i];
          }
        }

        is(
          ss.getCustomTabValue(tab, "uniq"),
          expectedData,
          "load " + loadCount + " - correct tab was restored"
        );

        // select the next tab
        window.gBrowser.selectTabAtIndex(tabOrder[loadCount]);
      } else {
        gProgressListener.unsetCallback();
        resolve();
      }
    });
  });

  let backupState = ss.getBrowserState();
  ss.setBrowserState(JSON.stringify(state));
  await promiseRestoringTabs;

  // Cleanup.
  await promiseBrowserState(backupState);
});