/* 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/. */

/* eslint max-len: ["error", 80] */

let htmlAboutAddonsWindow;

const HTML_NS = "http://www.w3.org/1999/xhtml";

function clickElement(el) {
  el.dispatchEvent(new CustomEvent("click"));
}

function createMessageBar(messageBarStack, { attrs, children, onclose } = {}) {
  const win = messageBarStack.ownerGlobal;
  const messageBar = win.document.createElementNS(HTML_NS, "message-bar");
  if (attrs) {
    for (const [k, v] of Object.entries(attrs)) {
      messageBar.setAttribute(k, v);
    }
  }
  if (children) {
    if (Array.isArray(children)) {
      messageBar.append(...children);
    } else {
      messageBar.append(children);
    }
  }
  messageBar.addEventListener("message-bar:close", onclose, { once: true });
  messageBarStack.append(messageBar);
  return messageBar;
}

add_setup(async function () {
  htmlAboutAddonsWindow = await loadInitialView("extension");
  registerCleanupFunction(() => closeView(htmlAboutAddonsWindow));
});

add_task(async function test_message_bar_stack() {
  const win = htmlAboutAddonsWindow;

  let messageBarStack = win.document.getElementById("abuse-reports-messages");

  ok(messageBarStack, "Got a message-bar-stack in HTML about:addons page");

  is(
    messageBarStack.maxMessageBarCount,
    3,
    "Got the expected max-message-bar-count property"
  );

  is(
    messageBarStack.childElementCount,
    0,
    "message-bar-stack is initially empty"
  );
});

add_task(async function test_create_message_bar_create_and_onclose() {
  const win = htmlAboutAddonsWindow;
  const messageBarStack = win.document.getElementById("abuse-reports-messages");

  let messageEl = win.document.createElementNS(HTML_NS, "span");
  messageEl.textContent = "A message bar text";
  let buttonEl = win.document.createElementNS(HTML_NS, "button");
  buttonEl.textContent = "An action button";

  let messageBar;
  let onceMessageBarClosed = new Promise(resolve => {
    messageBar = createMessageBar(messageBarStack, {
      children: [messageEl, buttonEl],
      onclose: resolve,
    });
  });

  is(
    messageBarStack.childElementCount,
    1,
    "message-bar-stack has a child element"
  );
  is(
    messageBarStack.firstElementChild,
    messageBar,
    "newly created message-bar added as message-bar-stack child element"
  );

  const slot = messageBar.shadowRoot.querySelector("slot");
  is(
    slot.assignedNodes()[0],
    messageEl,
    "Got the expected span element assigned to the message-bar slot"
  );
  is(
    slot.assignedNodes()[1],
    buttonEl,
    "Got the expected button element assigned to the message-bar slot"
  );

  let dismissed = BrowserTestUtils.waitForEvent(
    messageBar,
    "message-bar:user-dismissed"
  );
  info("Click the close icon on the newly created message-bar");
  clickElement(messageBar.closeButton);
  await dismissed;

  info("Expect the onclose function to be called");
  await onceMessageBarClosed;

  is(
    messageBarStack.childElementCount,
    0,
    "message-bar-stack has no child elements"
  );
});

add_task(async function test_max_message_bar_count() {
  const win = htmlAboutAddonsWindow;
  const messageBarStack = win.document.getElementById("abuse-reports-messages");

  info("Create a new message-bar");
  let messageElement = document.createElementNS(HTML_NS, "span");
  messageElement = "message bar label";

  let onceMessageBarClosed = new Promise(resolve => {
    createMessageBar(messageBarStack, {
      children: messageElement,
      onclose: resolve,
    });
  });

  is(
    messageBarStack.childElementCount,
    1,
    "message-bar-stack has the expected number of children"
  );

  info("Create 3 more message bars");
  const allBarsPromises = [];
  for (let i = 2; i <= 4; i++) {
    allBarsPromises.push(
      new Promise(resolve => {
        createMessageBar(messageBarStack, {
          attrs: { dismissable: "" },
          children: [messageElement, i],
          onclose: resolve,
        });
      })
    );
  }

  info("Expect first message-bar to closed automatically");
  await onceMessageBarClosed;

  is(
    messageBarStack.childElementCount,
    3,
    "message-bar-stack has the expected number of children"
  );

  info("Click on close icon for the second message-bar");
  clickElement(messageBarStack.firstElementChild.closeButton);

  info("Expect the second message-bar to be closed");
  await allBarsPromises[0];

  is(
    messageBarStack.childElementCount,
    2,
    "message-bar-stack has the expected number of children"
  );

  info("Clear the entire message-bar-stack content");
  messageBarStack.textContent = "";

  info("Expect all the created message-bar to be closed automatically");
  await Promise.all(allBarsPromises);

  is(
    messageBarStack.childElementCount,
    0,
    "message-bar-stack has no child elements"
  );
});