/**
 * Copyright (c) 2023-present Plane Software, Inc. and contributors
 * SPDX-License-Identifier: AGPL-3.0-only
 * See the LICENSE file for details.
 */

import type { ReactNode } from "react";
import { useRef, useState } from "react";
import { observer } from "mobx-react";
import { usePopper } from "react-popper";
import { Combobox } from "@headlessui/react";
// plane imports
import { useTranslation } from "@plane/i18n";
import { SearchIcon, IntakeStateGroupIcon, ChevronDownIcon, CheckIcon } from "@plane/propel/icons";
import type { IIntakeState } from "@plane/types";
import { ComboDropDown, Spinner } from "@plane/ui";
import { cn } from "@plane/utils";
// components
import { DropdownButton } from "@/components/dropdowns/buttons";
import { BUTTON_VARIANTS_WITH_TEXT } from "@/components/dropdowns/constants";
import type { TDropdownProps } from "@/components/dropdowns/types";
// hooks
import { useDropdown } from "@/hooks/use-dropdown";
export type TWorkItemStateDropdownBaseProps = TDropdownProps & {
  alwaysAllowStateChange?: boolean;
  button?: ReactNode;
  dropdownArrow?: boolean;
  dropdownArrowClassName?: string;
  filterAvailableStateIds?: boolean;
  getStateById: (stateId: string | null | undefined) => IIntakeState | undefined;
  iconSize?: string;
  isForWorkItemCreation?: boolean;
  isInitializing?: boolean;
  onChange: (val: string) => void;
  onClose?: () => void;
  onDropdownOpen?: () => void;
  projectId: string | undefined;
  renderByDefault?: boolean;
  showDefaultState?: boolean;
  stateIds: string[];
  value: string | undefined | null;
};

export const WorkItemStateDropdownBase = observer(function WorkItemStateDropdownBase(
  props: TWorkItemStateDropdownBaseProps
) {
  const {
    button,
    buttonClassName,
    buttonContainerClassName,
    buttonVariant,
    className = "",
    disabled = false,
    dropdownArrow = false,
    dropdownArrowClassName = "",
    getStateById,
    hideIcon = false,
    iconSize = "size-4",
    isInitializing = false,
    onChange,
    onClose,
    onDropdownOpen,
    placement,
    renderByDefault = true,
    showDefaultState = true,
    showTooltip = false,
    stateIds,
    tabIndex,
    value,
  } = props;
  // refs
  const dropdownRef = useRef<HTMLDivElement | null>(null);
  const inputRef = useRef<HTMLInputElement | null>(null);
  // popper-js refs
  const [referenceElement, setReferenceElement] = useState<HTMLButtonElement | null>(null);
  const [popperElement, setPopperElement] = useState<HTMLDivElement | null>(null);
  // states
  const [query, setQuery] = useState("");
  const [isOpen, setIsOpen] = useState(false);
  // store hooks
  const { t } = useTranslation();
  const statesList = stateIds.map((stateId) => getStateById(stateId)).filter((state) => !!state);
  const defaultState = statesList?.find((state) => state?.default) || statesList[0];
  const stateValue = value ? value : showDefaultState ? defaultState?.id : undefined;
  // popper-js init
  const { styles, attributes } = usePopper(referenceElement, popperElement, {
    placement: placement ?? "bottom-start",
    modifiers: [
      {
        name: "preventOverflow",
        options: {
          padding: 12,
        },
      },
    ],
  });
  // dropdown init
  const { handleClose, handleKeyDown, handleOnClick, searchInputKeyDown } = useDropdown({
    dropdownRef,
    inputRef,
    isOpen,
    onClose,
    onOpen: onDropdownOpen,
    query,
    setIsOpen,
    setQuery,
  });

  // derived values
  const options = statesList?.map((state) => ({
    value: state?.id,
    query: `${state?.name}`,
    content: (
      <div className="flex items-center gap-2">
        <IntakeStateGroupIcon
          stateGroup={state?.group ?? "triage"}
          color={state?.color}
          className={cn("flex-shrink-0", iconSize)}
        />
        <span className="flex-grow truncate text-left">{state?.name}</span>
      </div>
    ),
  }));

  const filteredOptions =
    query === "" ? options : options?.filter((o) => o.query.toLowerCase().includes(query.toLowerCase()));

  const selectedState = stateValue ? getStateById(stateValue) : undefined;

  const dropdownOnChange = (val: string) => {
    onChange(val);
    handleClose();
  };

  const comboButton = button ? (
    <button
      ref={setReferenceElement}
      type="button"
      className={cn(
        "clickable block h-full w-full rounded-full border-0 bg-transparent shadow-none outline-none focus:outline-none focus-visible:outline-none focus-visible:ring-0",
        buttonContainerClassName
      )}
      onClick={handleOnClick}
      disabled={disabled}
      tabIndex={tabIndex}
    >
      {button}
    </button>
  ) : (
    <button
      tabIndex={tabIndex}
      ref={setReferenceElement}
      type="button"
      className={cn(
        "clickable block h-full max-w-full rounded-full border-0 bg-transparent shadow-none outline-none focus:outline-none focus-visible:outline-none focus-visible:ring-0",
        {
          "cursor-not-allowed text-secondary": disabled,
          "cursor-pointer": !disabled,
        },
        buttonContainerClassName
      )}
      onClick={handleOnClick}
      disabled={disabled}
    >
      <DropdownButton
        className={buttonClassName}
        isActive={isOpen}
        tooltipHeading={t("state")}
        tooltipContent={selectedState?.name ?? t("state")}
        showTooltip={showTooltip}
        variant={buttonVariant}
        renderToolTipByDefault={renderByDefault}
      >
        {isInitializing ? (
          <Spinner className="h-3.5 w-3.5" />
        ) : (
          <>
            {!hideIcon && (
              <IntakeStateGroupIcon
                stateGroup={selectedState?.group ?? "triage"}
                color={selectedState?.color ?? "var(--text-color-tertiary)"}
                className={cn("flex-shrink-0", iconSize)}
              />
            )}
            {BUTTON_VARIANTS_WITH_TEXT.includes(buttonVariant) && (
              <span className="flex-grow truncate text-left">{selectedState?.name ?? t("state")}</span>
            )}
            {dropdownArrow && (
              <ChevronDownIcon
                className={cn("h-2.5 w-2.5 flex-shrink-0", dropdownArrowClassName)}
                aria-hidden="true"
              />
            )}
          </>
        )}
      </DropdownButton>
    </button>
  );

  return (
    <ComboDropDown
      as="div"
      ref={dropdownRef}
      className={cn("h-full", className)}
      value={stateValue}
      onChange={dropdownOnChange}
      disabled={disabled}
      onKeyDown={handleKeyDown}
      button={comboButton}
      renderByDefault={renderByDefault}
    >
      {isOpen && (
        <Combobox.Options className="fixed z-10" static>
          <div
            className="nodedc-glass-modal nodedc-glass-popup-surface my-1 w-52 rounded-[1.25rem] border-0 px-3 py-3 text-12 shadow-none outline-none"
            ref={setPopperElement}
            style={styles.popper}
            {...attributes.popper}
          >
            <div className="flex items-center gap-1.5 rounded-[0.95rem] border-0 bg-white/5 px-3 py-2 outline-none">
              <SearchIcon className="h-3.5 w-3.5 text-placeholder" strokeWidth={1.5} />
              <Combobox.Input
                as="input"
                ref={inputRef}
                className="w-full bg-transparent py-0 text-12 text-secondary placeholder:text-placeholder outline-none focus:outline-none"
                value={query}
                onChange={(e) => setQuery(e.target.value)}
                placeholder={t("common.search.label")}
                displayValue={(assigned: any) => assigned?.name}
                onKeyDown={searchInputKeyDown}
              />
            </div>
            <div className="mt-2 max-h-56 space-y-1 overflow-y-auto">
              {filteredOptions ? (
                filteredOptions.length > 0 ? (
                  filteredOptions.map((option) => (
                    <Combobox.Option
                      key={option.value}
                      value={option.value}
                      className={({ active, selected }) =>
                        cn(
                          `flex w-full cursor-pointer items-center justify-between gap-2 truncate rounded-[0.9rem] px-2 py-2 select-none outline-none ${
                            active ? "bg-white/6" : ""
                          } ${selected ? "text-primary" : "text-secondary"}`
                        )
                      }
                    >
                      {({ selected }) => (
                        <>
                          <span className="flex-grow truncate">{option.content}</span>
                          {selected && <CheckIcon className="h-3.5 w-3.5 flex-shrink-0" />}
                        </>
                      )}
                    </Combobox.Option>
                  ))
                ) : (
                  <p className="px-1.5 py-1 text-placeholder italic">{t("no_matching_results")}</p>
                )
              ) : (
                <p className="px-1.5 py-1 text-placeholder italic">{t("loading")}</p>
              )}
            </div>
          </div>
        </Combobox.Options>
      )}
    </ComboDropDown>
  );
});
