/* 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/. */

"use strict";

const kXULWidgetId = "a-test-button"; // we'll create a button with this ID.
const kAPIWidgetId = "feed-button";
const kPanel = CustomizableUI.AREA_FIXED_OVERFLOW_PANEL;
const kToolbar = CustomizableUI.AREA_NAVBAR;
const kVisiblePalette = "customization-palette";

function checkWrapper(id) {
  is(document.querySelectorAll("#wrapper-" + id).length, 1, "There should be exactly 1 wrapper for " + id + " in the customizing window.");
}

async function ensureVisibleIfInPalette(node) {
    if (node.parentNode.parentNode == gNavToolbox.palette) {
      node.scrollIntoView();
      window.QueryInterface(Ci.nsIInterfaceRequestor);
      let dwu = window.getInterface(Ci.nsIDOMWindowUtils);
      await BrowserTestUtils.waitForCondition(() => {
        let nodeBounds = dwu.getBoundsWithoutFlushing(node);
        let paletteBounds = dwu.getBoundsWithoutFlushing(gNavToolbox.palette);
        return nodeBounds.top >= paletteBounds.top && nodeBounds.bottom <= paletteBounds.bottom;
      });
    }
}

var move = {
  "drag": async function(id, target) {
    let targetNode = document.getElementById(target);
    if (targetNode.customizationTarget) {
      targetNode = targetNode.customizationTarget;
    }
    let nodeToMove = document.getElementById(id);
    await ensureVisibleIfInPalette(nodeToMove);
    simulateItemDrag(nodeToMove, targetNode);
  },
  "dragToItem": async function(id, target) {
    let targetNode = document.getElementById(target);
    if (targetNode.customizationTarget) {
      targetNode = targetNode.customizationTarget;
    }
    let items = targetNode.querySelectorAll("toolbarpaletteitem");
    if (target == kPanel) {
      targetNode = items[items.length - 1];
    } else {
      targetNode = items[0];
    }
    let nodeToMove = document.getElementById(id);
    await ensureVisibleIfInPalette(nodeToMove);
    simulateItemDrag(nodeToMove, targetNode);
  },
  "API": function(id, target) {
    if (target == kVisiblePalette) {
      return CustomizableUI.removeWidgetFromArea(id);
    }
    return CustomizableUI.addWidgetToArea(id, target, null);
  }
};

function isLast(containerId, defaultPlacements, id) {
  assertAreaPlacements(containerId, defaultPlacements.concat([id]));
  is(document.getElementById(containerId).customizationTarget.lastChild.firstChild.id, id,
     "Widget " + id + " should be in " + containerId + " in customizing window.");
  is(otherWin.document.getElementById(containerId).customizationTarget.lastChild.id, id,
     "Widget " + id + " should be in " + containerId + " in other window.");
}

function getLastVisibleNodeInToolbar(containerId, win = window) {
  let container = win.document.getElementById(containerId).customizationTarget;
  let rv = container.lastChild;
  while (rv && (rv.getAttribute("hidden") == "true" || (rv.firstChild && rv.firstChild.getAttribute("hidden") == "true"))) {
    rv = rv.previousSibling;
  }
  return rv;
}

function isLastVisibleInToolbar(containerId, defaultPlacements, id) {
  let newPlacements;
  for (let i = defaultPlacements.length - 1; i >= 0; i--) {
    let el = document.getElementById(defaultPlacements[i]);
    if (el && el.getAttribute("hidden") != "true") {
      newPlacements = [...defaultPlacements];
      newPlacements.splice(i + 1, 0, id);
      break;
    }
  }
  if (!newPlacements) {
    assertAreaPlacements(containerId, defaultPlacements.concat([id]));
  } else {
    assertAreaPlacements(containerId, newPlacements);
  }
  is(getLastVisibleNodeInToolbar(containerId).firstChild.id, id,
     "Widget " + id + " should be in " + containerId + " in customizing window.");
  is(getLastVisibleNodeInToolbar(containerId, otherWin).id, id,
     "Widget " + id + " should be in " + containerId + " in other window.");
}

function isFirst(containerId, defaultPlacements, id) {
  assertAreaPlacements(containerId, [id].concat(defaultPlacements));
  is(document.getElementById(containerId).customizationTarget.firstChild.firstChild.id, id,
     "Widget " + id + " should be in " + containerId + " in customizing window.");
  is(otherWin.document.getElementById(containerId).customizationTarget.firstChild.id, id,
     "Widget " + id + " should be in " + containerId + " in other window.");
}

async function checkToolbar(id, method) {
  // Place at start of the toolbar:
  let toolbarPlacements = getAreaWidgetIds(kToolbar);
  await move[method](id, kToolbar);
  if (method == "dragToItem") {
    isFirst(kToolbar, toolbarPlacements, id);
  } else if (method == "drag") {
    isLastVisibleInToolbar(kToolbar, toolbarPlacements, id);
  } else {
    isLast(kToolbar, toolbarPlacements, id);
  }
  checkWrapper(id);
}

async function checkPanel(id, method) {
  let panelPlacements = getAreaWidgetIds(kPanel);
  await move[method](id, kPanel);
  let children = document.getElementById(kPanel).querySelectorAll("toolbarpaletteitem");
  let otherChildren = otherWin.document.getElementById(kPanel).children;
  let newPlacements = panelPlacements.concat([id]);
  // Relative position of the new item from the end:
  let position = -1;
  // For the drag to item case, we drag to the last item, making the dragged item the
  // penultimate item. We can't well use the first item because the panel has complicated
  // rules about rearranging wide items (which, by default, the first two items are).
  if (method == "dragToItem") {
    newPlacements.pop();
    newPlacements.splice(panelPlacements.length - 1, 0, id);
    position = -2;
  }
  assertAreaPlacements(kPanel, newPlacements);
  is(children[children.length + position].firstChild.id, id,
     "Widget " + id + " should be in " + kPanel + " in customizing window.");
  is(otherChildren[otherChildren.length + position].id, id,
     "Widget " + id + " should be in " + kPanel + " in other window.");
  checkWrapper(id);
}

async function checkPalette(id, method) {
  // Move back to palette:
  await move[method](id, kVisiblePalette);
  ok(CustomizableUI.inDefaultState, "Should end in default state");
  let visibleChildren = gCustomizeMode.visiblePalette.children;
  let expectedChild = method == "dragToItem" ? visibleChildren[0] : visibleChildren[visibleChildren.length - 1];
  is(expectedChild.firstChild.id, id, "Widget " + id + " was moved using " + method + " and should now be wrapped in palette in customizing window.");
  if (id == kXULWidgetId) {
    ok(otherWin.gNavToolbox.palette.querySelector("#" + id), "Widget " + id + " should be in invisible palette in other window.");
  }
  checkWrapper(id);
}

// This test needs a XUL button that's in the palette by default. No such
// button currently exists, so we create a simple one.
function createXULButtonForWindow(win) {
  createDummyXULButton(kXULWidgetId, "test-button", win);
}

function removeXULButtonForWindow(win) {
  win.gNavToolbox.palette.querySelector(`#${kXULWidgetId}`).remove();
}

var otherWin;

// Moving widgets in two windows, one with customize mode and one without, should work.
add_task(async function MoveWidgetsInTwoWindows() {
  CustomizableUI.createWidget({
    id: "cui-mode-wrapping-some-panel-item",
    label: "Test panel wrapping",
  });
  await startCustomizing();
  otherWin = await openAndLoadWindow(null, true);
  await otherWin.PanelUI.ensureReady();
  // Create the XUL button to use in the test in both windows.
  createXULButtonForWindow(window);
  createXULButtonForWindow(otherWin);
  ok(CustomizableUI.inDefaultState, "Should start in default state");

  for (let widgetId of [kXULWidgetId, kAPIWidgetId]) {
    for (let method of ["API", "drag", "dragToItem"]) {
      info("Moving widget " + widgetId + " using " + method);
      await checkToolbar(widgetId, method);
      // We add an item to the panel because otherwise we can't test dragging
      // to items that are already there. We remove it because
      // 'checkPalette' checks that we leave the browser in the default state.
      CustomizableUI.addWidgetToArea("cui-mode-wrapping-some-panel-item", CustomizableUI.AREA_FIXED_OVERFLOW_PANEL);
      await checkPanel(widgetId, method);
      CustomizableUI.removeWidgetFromArea("cui-mode-wrapping-some-panel-item");
      await checkPalette(widgetId, method);
      CustomizableUI.addWidgetToArea("cui-mode-wrapping-some-panel-item", CustomizableUI.AREA_FIXED_OVERFLOW_PANEL);
      await checkPanel(widgetId, method);
      await checkToolbar(widgetId, method);
      CustomizableUI.removeWidgetFromArea("cui-mode-wrapping-some-panel-item");
      await checkPalette(widgetId, method);
    }
  }
  await promiseWindowClosed(otherWin);
  otherWin = null;
  await endCustomizing();
  removeXULButtonForWindow(window);
});

add_task(async function asyncCleanup() {
  CustomizableUI.destroyWidget("cui-mode-wrapping-some-panel-item");
  await resetCustomization();
});