import { Fragment } from "react";
import { useRouter } from "next/router";
import { observer } from "mobx-react-lite";
import Link from "next/link";
import { useTheme } from "next-themes";
import { Menu, Transition } from "@headlessui/react";
import { mutate } from "swr";
import { Check, ChevronDown, LogOut, Plus, Settings, UserCircle2 } from "lucide-react";
// mobx store
import { useMobxStore } from "lib/mobx/store-provider";
// hooks
import useToast from "hooks/use-toast";
// ui
import { Avatar, Loader } from "@plane/ui";
// types
import { IWorkspace } from "types";

// Static Data
const WORKSPACE_DROPDOWN_ITEMS = (workspaceSlug: string, userId: string) => [
  {
    name: "Workspace Settings",
    href: `/${workspaceSlug}/settings`,
  },
  {
    name: "Workspace Invites",
    href: "/invitations",
  },
  {
    name: "My Profile",
    href: `/${workspaceSlug}/profile/${userId}`,
  },
];

const profileLinks = (workspaceSlug: string, userId: string) => [
  {
    name: "View profile",
    icon: UserCircle2,
    link: `/${workspaceSlug}/profile/${userId}`,
  },
  {
    name: "Settings",
    icon: Settings,
    link: "/profile",
  },
];

export const WorkspaceSidebarDropdown = observer(() => {
  const router = useRouter();
  const { workspaceSlug } = router.query;
  // store
  const {
    theme: { sidebarCollapsed },
    workspace: { workspaces, currentWorkspace: activeWorkspace },
    user: { currentUser, updateCurrentUser, isUserInstanceAdmin, signOut },
    trackEvent: { setTrackElement },
  } = useMobxStore();
  // hooks
  const { setToastAlert } = useToast();
  const { setTheme } = useTheme();

  const handleWorkspaceNavigation = (workspace: IWorkspace) => {
    updateCurrentUser({
      last_workspace_id: workspace?.id,
    })
      .then(() => {
        router.push(`/${workspace.slug}/`);
      })
      .catch(() =>
        setToastAlert({
          type: "error",
          title: "Error!",
          message: "Failed to navigate to the workspace. Please try again.",
        })
      );
  };

  const handleSignOut = async () => {
    await signOut()
      .then(() => {
        mutate("CURRENT_USER_DETAILS", null);
        setTheme("system");
        router.push("/");
      })
      .catch(() =>
        setToastAlert({
          type: "error",
          title: "Error!",
          message: "Failed to sign out. Please try again.",
        })
      );
  };

  return (
    <div className="flex items-center gap-x-3 gap-y-2 px-4 pt-4">
      <Menu as="div" className="relative col-span-4 h-full flex-grow truncate text-left">
        {({ open }) => (
          <>
            <Menu.Button className="group/menu-button h-full w-full truncate rounded-md text-sm font-medium text-custom-sidebar-text-200 hover:bg-custom-sidebar-background-80 focus:outline-none">
              <div
                className={`flex items-center  gap-x-2 truncate rounded p-1 ${
                  sidebarCollapsed ? "justify-center" : "justify-between"
                }`}
              >
                <div className="flex items-center gap-2 truncate">
                  <div
                    className={`relative grid h-6 w-6 flex-shrink-0 place-items-center uppercase ${
                      !activeWorkspace?.logo && "rounded bg-custom-primary-500 text-white"
                    }`}
                  >
                    {activeWorkspace?.logo && activeWorkspace.logo !== "" ? (
                      <img
                        src={activeWorkspace.logo}
                        className="absolute left-0 top-0 h-full w-full rounded object-cover"
                        alt="Workspace Logo"
                      />
                    ) : (
                      activeWorkspace?.name?.charAt(0) ?? "..."
                    )}
                  </div>

                  {!sidebarCollapsed && (
                    <h4 className="truncate text-base font-medium text-custom-text-100">
                      {activeWorkspace?.name ? activeWorkspace.name : "Loading..."}
                    </h4>
                  )}
                </div>

                {!sidebarCollapsed && (
                  <ChevronDown
                    className={`mx-1 hidden h-4 w-4 flex-shrink-0 group-hover/menu-button:block ${
                      open ? "rotate-180" : ""
                    } text-custom-sidebar-text-400 duration-300`}
                  />
                )}
              </div>
            </Menu.Button>

            <Transition
              as={Fragment}
              enter="transition ease-out duration-100"
              enterFrom="transform opacity-0 scale-95"
              enterTo="transform opacity-100 scale-100"
              leave="transition ease-in duration-75"
              leaveFrom="transform opacity-100 scale-100"
              leaveTo="transform opacity-0 scale-95"
            >
              <Menu.Items className="fixed left-4 z-20 mt-1 flex w-full max-w-[17rem] origin-top-left flex-col rounded-md border border-custom-sidebar-border-200 bg-custom-sidebar-background-100 shadow-lg outline-none">
                <div className="flex max-h-96 flex-col items-start justify-start gap-3 overflow-y-scroll px-3">
                  <span className="sticky top-0 z-10 h-full w-full bg-custom-background-100 pt-3 text-sm font-medium text-custom-sidebar-text-200">
                    Workspace
                  </span>
                  {workspaces ? (
                    <div className="flex h-full w-full flex-col items-start justify-start gap-1.5">
                      {workspaces.length > 0 ? (
                        workspaces.map((workspace: IWorkspace) => (
                          <Menu.Item key={workspace.id}>
                            {() => (
                              <Link
                                href={`/${workspace.slug}`}
                                onClick={() => handleWorkspaceNavigation(workspace)}
                                className="flex w-full items-center justify-between gap-1 rounded-md p-1 text-sm text-custom-sidebar-text-100 hover:bg-custom-sidebar-background-80"
                              >
                                <div className="flex items-center justify-start gap-2.5 truncate">
                                  <span
                                    className={`relative flex h-6 w-6 flex-shrink-0 items-center  justify-center p-2 text-xs uppercase ${
                                      !workspace?.logo && "rounded bg-custom-primary-500 text-white"
                                    }`}
                                  >
                                    {workspace?.logo && workspace.logo !== "" ? (
                                      <img
                                        src={workspace.logo}
                                        className="absolute left-0 top-0 h-full w-full rounded object-cover"
                                        alt="Workspace Logo"
                                      />
                                    ) : (
                                      workspace?.name?.charAt(0) ?? "..."
                                    )}
                                  </span>

                                  <h5
                                    className={`truncate text-sm ${
                                      workspaceSlug === workspace.slug ? "" : "text-custom-text-200"
                                    }`}
                                  >
                                    {workspace.name}
                                  </h5>
                                </div>
                                {workspace.id === activeWorkspace?.id && (
                                  <span className="flex-shrink-0 p-1">
                                    <Check className="h-3 w-3.5 text-custom-sidebar-text-100" />
                                  </span>
                                )}
                              </Link>
                            )}
                          </Menu.Item>
                        ))
                      ) : (
                        <p>No workspace found!</p>
                      )}
                      <div className="sticky bottom-0 z-10 h-full w-full bg-custom-background-100">
                        <Menu.Item>
                          {() => (
                            <Link
                              href="/create-workspace"
                              className="flex w-full items-center gap-2 px-2 py-1 text-sm text-custom-sidebar-text-200 hover:bg-custom-sidebar-background-80"
                              onClick={() => {
                                setTrackElement("APP_SIEDEBAR_WORKSPACE_DROPDOWN");
                              }}
                            >
                              <Plus className="h-4 w-4" />
                              Create Workspace
                            </Link>
                          )}
                        </Menu.Item>
                      </div>
                    </div>
                  ) : (
                    <div className="w-full">
                      <Loader className="space-y-2">
                        <Loader.Item height="30px" />
                        <Loader.Item height="30px" />
                      </Loader>
                    </div>
                  )}
                </div>
                <div className="flex w-full flex-col items-start justify-start gap-2 border-t border-custom-sidebar-border-200 px-3 py-2 text-sm">
                  {WORKSPACE_DROPDOWN_ITEMS(workspaceSlug?.toString() ?? "", currentUser?.id ?? "").map(
                    (link, index) => (
                      <Menu.Item key={index} as="div" className="flex w-full">
                        {() => (
                          <Link
                            className="flex w-full cursor-pointer items-center justify-start rounded px-2 py-1 text-sm text-custom-sidebar-text-200 hover:bg-custom-sidebar-background-80"
                            href={link.href}
                          >
                            {link.name}
                          </Link>
                        )}
                      </Menu.Item>
                    )
                  )}
                </div>
                <div className="w-full border-t border-t-custom-sidebar-border-100 px-3 py-2">
                  <Menu.Item
                    as="button"
                    type="button"
                    className="flex w-full items-center justify-start rounded px-2 py-1 text-sm text-red-600 hover:bg-custom-sidebar-background-80"
                    onClick={handleSignOut}
                  >
                    Sign out
                  </Menu.Item>
                </div>
              </Menu.Items>
            </Transition>
          </>
        )}
      </Menu>

      {!sidebarCollapsed && (
        <Menu as="div" className="relative flex-shrink-0">
          <Menu.Button className="grid place-items-center outline-none">
            <Avatar
              name={currentUser?.display_name}
              src={currentUser?.avatar}
              size={24}
              shape="square"
              className="!text-base"
            />
          </Menu.Button>

          <Transition
            as={Fragment}
            enter="transition ease-out duration-100"
            enterFrom="transform opacity-0 scale-95"
            enterTo="transform opacity-100 scale-100"
            leave="transition ease-in duration-75"
            leaveFrom="transform opacity-100 scale-100"
            leaveTo="transform opacity-0 scale-95"
          >
            <Menu.Items
              className="absolute left-0 z-20 mt-1.5 flex w-52 origin-top-left  flex-col divide-y
          divide-custom-sidebar-border-200 rounded-md border border-custom-sidebar-border-200 bg-custom-sidebar-background-100 px-1 py-2 text-xs shadow-lg outline-none"
            >
              <div className="flex flex-col gap-2.5 pb-2">
                <span className="px-2 text-custom-sidebar-text-200">{currentUser?.email}</span>
                {profileLinks(workspaceSlug?.toString() ?? "", currentUser?.id ?? "").map((link, index) => (
                  <Menu.Item key={index} as="button" type="button">
                    <Link href={link.link}>
                      <span className="flex w-full items-center gap-2 rounded px-2 py-1 hover:bg-custom-sidebar-background-80">
                        <link.icon className="h-4 w-4 stroke-[1.5]" />
                        {link.name}
                      </span>
                    </Link>
                  </Menu.Item>
                ))}
              </div>
              <div className={`pt-2 ${isUserInstanceAdmin ? "pb-2" : ""}`}>
                <Menu.Item
                  as="button"
                  type="button"
                  className="flex w-full items-center gap-2 rounded px-2 py-1 hover:bg-custom-sidebar-background-80"
                  onClick={handleSignOut}
                >
                  <LogOut className="h-4 w-4 stroke-[1.5]" />
                  Sign out
                </Menu.Item>
              </div>
              {isUserInstanceAdmin && (
                <div className="p-2 pb-0">
                  <Menu.Item as="button" type="button" className="w-full">
                    <Link href="/god-mode">
                      <span className="flex w-full items-center justify-center rounded bg-custom-primary-100/20 px-2 py-1 text-sm font-medium text-custom-primary-100 hover:bg-custom-primary-100/30 hover:text-custom-primary-200">
                        Enter God Mode
                      </span>
                    </Link>
                  </Menu.Item>
                </div>
              )}
            </Menu.Items>
          </Transition>
        </Menu>
      )}
    </div>
  );
});