import browser from "webextension-polyfill";

import {
  createItem,
  setBadgeText,
  openNextItemOrOptionsPage,
} from "../item/item.js";

/**
 * Get properties for all the context menu entries.
 *
 * @returns The context menu entries.
 */
export function getContextMenus(): browser.Menus.CreateCreatePropertiesType[] {
  // In Manifest V2 the WebExtension icon is referred to as the
  // "browser action", in MV3 it's just "action".
  const actionContext: browser.Menus.ContextType =
    $browser === "firefox" ? "browser_action" : "action";

  const contextMenus: ReturnType<typeof getContextMenus> = [
    {
      id: "queue-add-new-link",
      title: "Add to Queue",
      contexts: ["link"],
    },
    {
      id: "queue-open-next-link-in-new-tab",
      title: "Open next link in new tab",
      contexts: [actionContext],
    },
    {
      id: "queue-open-options-page",
      title: "Open the extension page",
      contexts: [actionContext],
    },
  ];

  // Only Firefox supports context menu entries for tabs.
  if ($browser === "firefox") {
    contextMenus.push({
      id: "queue-add-new-link-tab",
      title: "Add to Queue",
      contexts: ["tab"],
    });
  }

  return contextMenus;
}

/**
 * Initialize all the context menu entries.
 */
export async function initializeContextMenus(): Promise<void> {
  const contextMenus = getContextMenus();
  await browser.contextMenus.removeAll();
  for (const contextMenu of contextMenus) {
    browser.contextMenus.create(contextMenu, contextCreatedHandler);
  }
}

/**
 * Event handler for context menu creation.
 */
function contextCreatedHandler(): void {
  const error = browser.runtime.lastError;
  if (error !== null && error !== undefined) {
    console.error("Queue", error.message);
  }
}

/**
 * Event handler for context menu clicks.
 *
 * @param contextMenuIds A set of all our context menu IDs.
 * @param info The context menu click data.
 * @param tab The browser tab, if available.
 */
export async function contextClicked(
  contextMenuIds: Set<string>,
  info: browser.Menus.OnClickData,
  tab?: browser.Tabs.Tab,
): Promise<void> {
  // Only handle context menus that we know the ID of.
  const id = info.menuItemId.toString();
  if (!contextMenuIds.has(id)) {
    return;
  }

  if (id.startsWith("queue-add-new-link")) {
    let text: string | undefined;
    let url: string | undefined;

    if (id === "queue-add-new-link") {
      text = info.linkText;
      url = info.linkUrl;
    } else if (id === "queue-add-new-link-tab") {
      text = tab?.title;
      url = info.pageUrl;
    } else {
      console.warn(`Encountered unknown context menu ID: ${id}`);
      return;
    }

    if (url === undefined) {
      console.warn("Cannot add a new item without a URL.");
      return;
    }

    const item = await createItem(text, url);
    await item.save();
    await setBadgeText();
  } else if (id === "queue-open-next-link-in-new-tab") {
    await openNextItemOrOptionsPage(true);
  } else if (id === "queue-open-options-page") {
    await browser.runtime.openOptionsPage();
  }
}