import React, { useState } from "react";
import { useRouter } from "next/router";
import { Popover, Transition } from "@headlessui/react";
import { observer } from "mobx-react-lite";
import { usePopper } from "react-popper";
// mobx store
import { useMobxStore } from "lib/mobx/store-provider";
// ui
import { ToggleSwitch } from "@plane/ui";
// icons
import { Check, ChevronUp } from "lucide-react";
// types
import { TCalendarLayouts } from "types";
// constants
import { CALENDAR_LAYOUTS } from "constants/calendar";

export const CalendarOptionsDropdown: React.FC = observer(() => {
  const router = useRouter();
  const { workspaceSlug, projectId } = router.query;

  const { issueFilter: issueFilterStore, calendar: calendarStore } = useMobxStore();

  const [referenceElement, setReferenceElement] = useState<HTMLButtonElement | null>(null);
  const [popperElement, setPopperElement] = useState<HTMLDivElement | null>(null);

  const { styles, attributes } = usePopper(referenceElement, popperElement, {
    placement: "auto",
    modifiers: [
      {
        name: "preventOverflow",
        options: {
          padding: 12,
        },
      },
    ],
  });

  const calendarLayout = issueFilterStore.userDisplayFilters.calendar?.layout ?? "month";
  const showWeekends = issueFilterStore.userDisplayFilters.calendar?.show_weekends ?? false;

  const handleLayoutChange = (layout: TCalendarLayouts) => {
    if (!workspaceSlug || !projectId) return;

    issueFilterStore.updateUserFilters(workspaceSlug.toString(), projectId.toString(), {
      display_filters: {
        calendar: {
          ...issueFilterStore.userDisplayFilters.calendar,
          layout,
        },
      },
    });

    calendarStore.updateCalendarPayload(
      layout === "month" ? calendarStore.calendarFilters.activeMonthDate : calendarStore.calendarFilters.activeWeekDate
    );
  };

  const handleToggleWeekends = () => {
    const showWeekends = issueFilterStore.userDisplayFilters.calendar?.show_weekends ?? false;

    if (!workspaceSlug || !projectId) return;

    issueFilterStore.updateUserFilters(workspaceSlug.toString(), projectId.toString(), {
      display_filters: {
        calendar: {
          ...issueFilterStore.userDisplayFilters.calendar,
          show_weekends: !showWeekends,
        },
      },
    });
  };

  return (
    <Popover className="relative">
      {({ open }) => (
        <>
          <Popover.Button as={React.Fragment}>
            <button
              type="button"
              ref={setReferenceElement}
              className={`outline-none bg-custom-background-80 text-xs rounded flex items-center gap-1.5 px-2.5 py-1 hover:bg-custom-background-80 ${
                open ? "text-custom-text-100" : "text-custom-text-200"
              }`}
            >
              <div className="font-medium">Options</div>
              <div
                className={`w-3.5 h-3.5 flex items-center justify-center transition-all ${open ? "" : "rotate-180"}`}
              >
                <ChevronUp width={12} strokeWidth={2} />
              </div>
            </button>
          </Popover.Button>
          <Transition
            as={React.Fragment}
            enter="transition ease-out duration-200"
            enterFrom="opacity-0 translate-y-1"
            enterTo="opacity-100 translate-y-0"
            leave="transition ease-in duration-150"
            leaveFrom="opacity-100 translate-y-0"
            leaveTo="opacity-0 translate-y-1"
          >
            <Popover.Panel className="fixed z-50">
              <div
                ref={setPopperElement}
                style={styles.popper}
                {...attributes.popper}
                className="absolute right-0 z-10 mt-1 bg-custom-background-100 border border-custom-border-200 shadow-custom-shadow-sm rounded min-w-[12rem] p-1 overflow-hidden"
              >
                <div>
                  {Object.entries(CALENDAR_LAYOUTS).map(([layout, layoutDetails]) => (
                    <button
                      key={layout}
                      type="button"
                      className="text-xs hover:bg-custom-background-80 w-full text-left px-1 py-1.5 rounded flex items-center justify-between gap-2"
                      onClick={() => handleLayoutChange(layoutDetails.key)}
                    >
                      {layoutDetails.title}
                      {calendarLayout === layout && <Check size={12} strokeWidth={2} />}
                    </button>
                  ))}
                  <button
                    type="button"
                    className="text-xs hover:bg-custom-background-80 w-full text-left px-1 py-1.5 rounded flex items-center justify-between gap-2"
                    onClick={handleToggleWeekends}
                  >
                    Show weekends
                    <ToggleSwitch value={showWeekends} onChange={() => {}} />
                  </button>
                </div>
              </div>
            </Popover.Panel>
          </Transition>
        </>
      )}
    </Popover>
  );
});
