import React, { useState } from "react";

import { useRouter } from "next/router";

// mobx
import { observer } from "mobx-react-lite";
import { useMobxStore } from "lib/mobx/store-provider";

// headless ui
import { Combobox, Dialog, Transition } from "@headlessui/react";
// icons
import { RectangleStackIcon, MagnifyingGlassIcon } from "@heroicons/react/24/outline";
// types
import { ICurrentUserResponse, IIssueLabels } from "types";

type Props = {
  isOpen: boolean;
  handleClose: () => void;
  parent: IIssueLabels | undefined;
  user: ICurrentUserResponse | undefined;
};

export const LabelsListModal: React.FC<Props> = observer(
  ({ isOpen, handleClose, parent, user }) => {
    const [query, setQuery] = useState("");

    const router = useRouter();
    const { workspaceSlug, projectId } = router.query;

    const { label: labelStore } = useMobxStore();
    const { updateLabel, getLabelChildren, getFilteredLabels } = labelStore;

    const filteredLabels = getFilteredLabels(query);

    const handleModalClose = () => {
      handleClose();
      setQuery("");
    };

    const addChildLabel = async (label: IIssueLabels) => {
      if (!workspaceSlug || !projectId || !user) return;

      updateLabel(
        workspaceSlug.toString(),
        projectId.toString(),
        label.id,
        {
          parent: parent?.id ?? "",
        },
        user
      );
    };

    return (
      <Transition.Root show={isOpen} as={React.Fragment} afterLeave={() => setQuery("")} appear>
        <Dialog as="div" className="relative z-20" onClose={handleModalClose}>
          <Transition.Child
            as={React.Fragment}
            enter="ease-out duration-300"
            enterFrom="opacity-0"
            enterTo="opacity-100"
            leave="ease-in duration-200"
            leaveFrom="opacity-100"
            leaveTo="opacity-0"
          >
            <div className="fixed inset-0 bg-custom-backdrop bg-opacity-50 transition-opacity" />
          </Transition.Child>

          <div className="fixed inset-0 z-20 overflow-y-auto p-4 sm:p-6 md:p-20">
            <Transition.Child
              as={React.Fragment}
              enter="ease-out duration-300"
              enterFrom="opacity-0 scale-95"
              enterTo="opacity-100 scale-100"
              leave="ease-in duration-200"
              leaveFrom="opacity-100 scale-100"
              leaveTo="opacity-0 scale-95"
            >
              <Dialog.Panel className="relative mx-auto max-w-2xl transform rounded-xl border border-custom-border-200 bg-custom-background-100 shadow-2xl transition-all">
                <Combobox>
                  <div className="relative m-1">
                    <MagnifyingGlassIcon
                      className="pointer-events-none absolute top-3.5 left-4 h-5 w-5 text-custom-text-100 text-opacity-40"
                      aria-hidden="true"
                    />
                    <Combobox.Input
                      className="h-12 w-full border-0 bg-transparent pl-11 pr-4 text-custom-text-100 outline-none focus:ring-0 sm:text-sm"
                      placeholder="Search..."
                      onChange={(e) => setQuery(e.target.value)}
                    />
                  </div>

                  <Combobox.Options static className="max-h-80 scroll-py-2 overflow-y-auto">
                    {filteredLabels.length > 0 && (
                      <li className="p-2">
                        {query === "" && (
                          <h2 className="mt-4 mb-2 px-3 text-xs font-semibold text-custom-text-100">
                            Labels
                          </h2>
                        )}
                        <ul className="text-sm text-gray-700">
                          {filteredLabels.map((label) => {
                            const children = getLabelChildren(label.id);

                            if (
                              (label.parent === "" || label.parent === null) && // issue does not have any other parent
                              label.id !== parent?.id && // issue is not itself
                              children?.length === 0 // issue doesn't have any othe children
                            )
                              return (
                                <Combobox.Option
                                  key={label.id}
                                  value={{
                                    name: label.name,
                                  }}
                                  className={({ active }) =>
                                    `flex w-full cursor-pointer select-none items-center gap-2 rounded-md px-3 py-2 text-custom-text-200 ${
                                      active ? "bg-custom-background-80 text-custom-text-100" : ""
                                    }`
                                  }
                                  onClick={() => {
                                    addChildLabel(label);
                                    handleClose();
                                  }}
                                >
                                  <span
                                    className="block h-1.5 w-1.5 flex-shrink-0 rounded-full"
                                    style={{
                                      backgroundColor: label.color !== "" ? label.color : "#000000",
                                    }}
                                  />
                                  {label.name}
                                </Combobox.Option>
                              );
                          })}
                        </ul>
                      </li>
                    )}
                  </Combobox.Options>

                  {query !== "" && filteredLabels.length === 0 && (
                    <div className="py-14 px-6 text-center sm:px-14">
                      <RectangleStackIcon
                        className="mx-auto h-6 w-6 text-custom-text-100 text-opacity-40"
                        aria-hidden="true"
                      />
                      <p className="mt-4 text-sm text-custom-text-100">
                        We couldn{"'"}t find any label with that term. Please try again.
                      </p>
                    </div>
                  )}
                </Combobox>
              </Dialog.Panel>
            </Transition.Child>
          </div>
        </Dialog>
      </Transition.Root>
    );
  }
);