import React, { useRef, useState } from "react";
import { Popover } from "@headlessui/react";
import DatePicker from "react-datepicker";
import { usePopper } from "react-popper";
import { CalendarDays, X } from "lucide-react";
// hooks
import { useDropdownKeyDown } from "hooks/use-dropdown-key-down";
import useOutsideClickDetector from "hooks/use-outside-click-detector";
// helpers
import { renderFormattedDate } from "helpers/date-time.helper";
import { cn } from "helpers/common.helper";
// types
import { TDropdownProps } from "./types";

type Props = TDropdownProps & {
  icon?: React.ReactNode;
  isClearable?: boolean;
  minDate?: Date;
  maxDate?: Date;
  onChange: (val: Date | null) => void;
  placeholder: string;
  value: Date | string | null;
  closeOnSelect?: boolean;
};

type ButtonProps = {
  className?: string;
  date: string | Date | null;
  icon: React.ReactNode;
  isClearable: boolean;
  hideText?: boolean;
  onClear: () => void;
  placeholder: string;
};

const BorderButton = (props: ButtonProps) => {
  const { className, date, icon, isClearable, hideText = false, onClear, placeholder } = props;

  return (
    <div
      className={cn(
        "h-full flex items-center gap-1.5 border-[0.5px] border-custom-border-300 hover:bg-custom-background-80 rounded text-xs px-2 py-0.5",
        className
      )}
    >
      {icon}
      {!hideText && <span className="flex-grow truncate">{date ? renderFormattedDate(date) : placeholder}</span>}
      {isClearable && (
        <X
          className="h-2 w-2 flex-shrink-0"
          onClick={(e) => {
            e.stopPropagation();
            onClear();
          }}
        />
      )}
    </div>
  );
};

const BackgroundButton = (props: ButtonProps) => {
  const { className, date, icon, isClearable, hideText = false, onClear, placeholder } = props;

  return (
    <div
      className={cn("h-full flex items-center gap-1.5 rounded text-xs px-2 py-0.5 bg-custom-background-80", className)}
    >
      {icon}
      {!hideText && <span className="flex-grow truncate">{date ? renderFormattedDate(date) : placeholder}</span>}
      {isClearable && (
        <X
          className="h-2 w-2 flex-shrink-0"
          onClick={(e) => {
            e.stopPropagation();
            onClear();
          }}
        />
      )}
    </div>
  );
};

const TransparentButton = (props: ButtonProps) => {
  const { className, date, icon, isClearable, hideText = false, onClear, placeholder } = props;

  return (
    <div
      className={cn(
        "h-full flex items-center gap-1.5 rounded text-xs px-2 py-0.5 hover:bg-custom-background-80",
        className
      )}
    >
      {icon}
      {!hideText && <span className="flex-grow truncate">{date ? renderFormattedDate(date) : placeholder}</span>}
      {isClearable && (
        <X
          className="h-2 w-2 flex-shrink-0"
          onClick={(e) => {
            e.stopPropagation();
            onClear();
          }}
        />
      )}
    </div>
  );
};

export const DateDropdown: React.FC<Props> = (props) => {
  const {
    buttonClassName = "",
    buttonContainerClassName,
    buttonVariant,
    className = "",
    disabled = false,
    icon = <CalendarDays className="h-3 w-3 flex-shrink-0" />,
    isClearable = true,
    minDate,
    maxDate,
    onChange,
    placeholder,
    placement,
    value,
    closeOnSelect = true,
    tabIndex,
  } = props;
  const [isOpen, setIsOpen] = useState(false);
  // refs
  const dropdownRef = useRef<HTMLDivElement | null>(null);
  // popper-js refs
  const [referenceElement, setReferenceElement] = useState<HTMLButtonElement | null>(null);
  const [popperElement, setPopperElement] = useState<HTMLDivElement | null>(null);
  // popper-js init
  const { styles, attributes } = usePopper(referenceElement, popperElement, {
    placement: placement ?? "bottom-start",
    modifiers: [
      {
        name: "preventOverflow",
        options: {
          padding: 12,
        },
      },
    ],
  });

  const isDateSelected = value !== null && value !== undefined && value.toString().trim() !== "";

  const openDropdown = () => {
    setIsOpen(true);
    if (referenceElement) referenceElement.focus();
  };
  const closeDropdown = () => setIsOpen(false);
  const handleKeyDown = useDropdownKeyDown(openDropdown, closeDropdown, isOpen);
  useOutsideClickDetector(dropdownRef, closeDropdown);

  return (
    <Popover
      ref={dropdownRef}
      tabIndex={tabIndex}
      className={cn("h-full flex-shrink-0", className)}
      onKeyDown={handleKeyDown}
    >
      <Popover.Button as={React.Fragment}>
        <button
          ref={setReferenceElement}
          type="button"
          className={cn(
            "block h-full max-w-full outline-none",
            {
              "cursor-not-allowed text-custom-text-200": disabled,
              "cursor-pointer": !disabled,
            },
            buttonContainerClassName
          )}
          onClick={openDropdown}
        >
          {buttonVariant === "border-with-text" ? (
            <BorderButton
              date={value}
              className={buttonClassName}
              icon={icon}
              placeholder={placeholder}
              isClearable={isClearable && isDateSelected}
              onClear={() => onChange(null)}
            />
          ) : buttonVariant === "border-without-text" ? (
            <BorderButton
              date={value}
              className={buttonClassName}
              icon={icon}
              placeholder={placeholder}
              isClearable={isClearable && isDateSelected}
              onClear={() => onChange(null)}
              hideText
            />
          ) : buttonVariant === "background-with-text" ? (
            <BackgroundButton
              date={value}
              className={buttonClassName}
              icon={icon}
              placeholder={placeholder}
              isClearable={isClearable && isDateSelected}
              onClear={() => onChange(null)}
            />
          ) : buttonVariant === "background-without-text" ? (
            <BackgroundButton
              date={value}
              className={buttonClassName}
              icon={icon}
              placeholder={placeholder}
              isClearable={isClearable && isDateSelected}
              onClear={() => onChange(null)}
              hideText
            />
          ) : buttonVariant === "transparent-with-text" ? (
            <TransparentButton
              date={value}
              className={buttonClassName}
              icon={icon}
              placeholder={placeholder}
              isClearable={isClearable && isDateSelected}
              onClear={() => onChange(null)}
            />
          ) : buttonVariant === "transparent-without-text" ? (
            <TransparentButton
              date={value}
              className={buttonClassName}
              icon={icon}
              placeholder={placeholder}
              isClearable={isClearable && isDateSelected}
              onClear={() => onChange(null)}
              hideText
            />
          ) : null}
        </button>
      </Popover.Button>
      {isOpen && (
        <Popover.Panel className="fixed z-10" static>
          <div className="my-1" ref={setPopperElement} style={styles.popper} {...attributes.popper}>
            <DatePicker
              selected={value ? new Date(value) : null}
              onChange={(val) => {
                onChange(val);
                if (closeOnSelect) closeDropdown();
              }}
              dateFormat="dd-MM-yyyy"
              minDate={minDate}
              maxDate={maxDate}
              calendarClassName="shadow-custom-shadow-rg rounded"
              inline
            />
          </div>
        </Popover.Panel>
      )}
    </Popover>
  );
};