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

"use strict";

// Verify full zoom levels inherit RDM full zoom after exiting RDM.

const TEST_URL = "https://example.com/";

function getZoomForBrowser(browser) {
  return ZoomManager.getZoomForBrowser(browser);
}

function setZoomForBrowser(browser, zoom) {
  ZoomManager.setZoomForBrowser(browser, zoom);
}

addRDMTask(
  null,
  async function ({ message }) {
    const INITIAL_ZOOM_LEVEL = 1;
    const PRE_RDM_ZOOM_LEVEL = 1.5;
    const MID_RDM_ZOOM_LEVEL = 2;

    const tab = await addTab(TEST_URL);
    const browser = tab.linkedBrowser;

    await navigateTo(TEST_URL);

    // Get the initial zoom level.
    const initialOuterZoom = getZoomForBrowser(browser);
    is(
      initialOuterZoom,
      INITIAL_ZOOM_LEVEL,
      "Initial outer zoom should be " + INITIAL_ZOOM_LEVEL + "."
    );

    // Change the zoom level before we open RDM.
    setZoomForBrowser(browser, PRE_RDM_ZOOM_LEVEL);

    const preRDMOuterZoom = getZoomForBrowser(browser);
    is(
      preRDMOuterZoom,
      PRE_RDM_ZOOM_LEVEL,
      "Pre-RDM outer zoom should be " + PRE_RDM_ZOOM_LEVEL + "."
    );

    // Start RDM on the tab. This will fundamentally change the way that browser behaves.
    // It will now pass all of its messages through to the RDM docshell, meaning that when
    // we request zoom level from it now, we are getting the RDM zoom level.
    const { ui } = await openRDM(tab);
    await waitForDeviceAndViewportState(ui);

    const uiDocShell = ui.toolWindow.docShell;

    // Bug 1541692: openRDM behaves differently in the test harness than it does
    // interactively. Interactively, many features of the container docShell -- including
    // zoom -- are copied over to the RDM browser. In the test harness, this seems to first
    // reset the docShell before toggling RDM, which makes checking the initial zoom of the
    // RDM pane not useful.

    const preZoomUIZoom = uiDocShell.browsingContext.fullZoom;
    is(
      preZoomUIZoom,
      INITIAL_ZOOM_LEVEL,
      "Pre-zoom UI zoom should be " + INITIAL_ZOOM_LEVEL + "."
    );

    // Set the zoom level. This should tunnel to the inner browser and leave the UI alone.
    setZoomForBrowser(browser, MID_RDM_ZOOM_LEVEL);

    // The UI zoom should be unchanged by this.
    const postZoomUIZoom = uiDocShell.browsingContext.fullZoom;
    is(
      postZoomUIZoom,
      preZoomUIZoom,
      "UI zoom should be unchanged by RDM zoom."
    );

    // The RDM zoom should be changed.
    const finalRDMZoom = getZoomForBrowser(browser);
    is(
      finalRDMZoom,
      MID_RDM_ZOOM_LEVEL,
      "RDM zoom should be " + MID_RDM_ZOOM_LEVEL + "."
    );

    // Leave RDM. This should cause the outer pane to take on the full zoom of the RDM pane.
    await closeRDM(tab);

    const finalOuterZoom = getZoomForBrowser(browser);
    is(
      finalOuterZoom,
      finalRDMZoom,
      "Final outer zoom should match last RDM zoom."
    );

    await removeTab(tab);
  },
  { onlyPrefAndTask: true }
);