import { Fragment } from "react";

import { useRouter } from "next/router";
import Link from "next/link";

// headless ui
import { Menu, Transition } from "@headlessui/react";
// hooks
import useUser from "hooks/use-user";
import useTheme from "hooks/use-theme";
import useWorkspaces from "hooks/use-workspaces";
import useToast from "hooks/use-toast";
// services
import userService from "services/user.service";
import authenticationService from "services/authentication.service";
// components
import { Avatar, Loader } from "components/ui";
// icons
import { CheckIcon, PlusIcon } from "@heroicons/react/24/outline";
// helpers
import { truncateText } from "helpers/string.helper";
// types
import { IWorkspace } from "types";

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

export const WorkspaceSidebarDropdown = () => {
  const router = useRouter();
  const { workspaceSlug } = router.query;
  // fetching user details
  const { user, mutateUser } = useUser();
  // fetching theme context
  const { collapsed: sidebarCollapse } = useTheme();

  const { setToastAlert } = useToast();

  // fetching workspaces
  const { activeWorkspace, workspaces } = useWorkspaces();

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

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

  return (
    <Menu as="div" className="relative col-span-4 inline-block w-full px-4 pt-4 text-left">
      <div className="flex items-center justify-between gap-2">
        <Menu.Button className="text-custom-sidebar-text-200 flex w-full items-center rounded-sm text-sm font-medium focus:outline-none">
          <div
            className={`flex w-full items-center gap-x-2 rounded-sm bg-custom-sidebar-background-80 p-1 ${
              sidebarCollapse ? "justify-center" : ""
            }`}
          >
            <div className="relative grid h-6 w-6 place-items-center rounded bg-gray-700 uppercase text-white">
              {activeWorkspace?.logo && activeWorkspace.logo !== "" ? (
                <img
                  src={activeWorkspace.logo}
                  className="absolute top-0 left-0 h-full w-full object-cover rounded"
                  alt="Workspace Logo"
                />
              ) : (
                activeWorkspace?.name?.charAt(0) ?? "..."
              )}
            </div>

            {!sidebarCollapse && (
              <h4 className="text-custom-text-100">
                {activeWorkspace?.name ? truncateText(activeWorkspace.name, 14) : "Loading..."}
              </h4>
            )}
          </div>
        </Menu.Button>

        {!sidebarCollapse && (
          <Link href={`/${workspaceSlug}/me/profile`}>
            <a>
              <div className="flex flex-grow justify-end">
                <Avatar user={user} height="28px" width="28px" fontSize="14px" />
              </div>
            </a>
          </Link>
        )}
      </div>

      <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-2 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-90 shadow-lg focus:outline-none"
        >
          <div className="flex flex-col items-start justify-start gap-3 p-3">
            <div className="text-sm text-custom-sidebar-text-200">{user?.email}</div>
            <span className="text-sm font-semibold text-custom-sidebar-text-200">Workspace</span>
            {workspaces ? (
              <div className="flex h-full w-full flex-col items-start justify-start gap-3.5">
                {workspaces.length > 0 ? (
                  workspaces.map((workspace) => (
                    <Menu.Item key={workspace.id}>
                      {({ active }) => (
                        <button
                          type="button"
                          onClick={() => handleWorkspaceNavigation(workspace)}
                          className="flex w-full items-center justify-between gap-1 rounded-md text-sm text-custom-sidebar-text-100"
                        >
                          <div className="flex items-center justify-start gap-2.5">
                            <span className="relative flex h-6 w-6 items-center justify-center rounded bg-gray-700 p-2 text-xs uppercase text-white">
                              {workspace?.logo && workspace.logo !== "" ? (
                                <img
                                  src={workspace.logo}
                                  className="absolute top-0 left-0 h-full w-full object-cover rounded"
                                  alt="Workspace Logo"
                                />
                              ) : (
                                workspace?.name?.charAt(0) ?? "..."
                              )}
                            </span>

                            <h5
                              className={`text-sm ${
                                workspaceSlug === workspace.slug ? "" : "text-custom-text-200"
                              }`}
                            >
                              {truncateText(workspace.name, 18)}
                            </h5>
                          </div>
                          <span className="p-1">
                            <CheckIcon
                              className={`h-3 w-3.5 text-custom-sidebar-text-100 ${
                                active || workspace.id === activeWorkspace?.id
                                  ? "opacity-100"
                                  : "opacity-0"
                              }`}
                            />
                          </span>
                        </button>
                      )}
                    </Menu.Item>
                  ))
                ) : (
                  <p>No workspace found!</p>
                )}
                <Menu.Item
                  as="button"
                  type="button"
                  onClick={() => {
                    router.push("/create-workspace");
                  }}
                  className="flex w-full items-center gap-1 text-sm text-custom-sidebar-text-200"
                >
                  <PlusIcon className="h-3 w-3" />
                  Create Workspace
                </Menu.Item>
              </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">
            {userLinks(workspaceSlug as string).map((link, index) => (
              <Menu.Item
                key={index}
                as="div"
                className="flex w-full items-center justify-start rounded px-2 py-1 text-sm text-custom-sidebar-text-200 hover:bg-custom-sidebar-background-80"
              >
                <Link href={link.href}>
                  <a className="w-full">{link.name}</a>
                </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>
  );
};