import dayjs from "dayjs";
import React, { useCallback, useContext, useEffect, useRef } from "react";

import { BORDER_COLOR, DATE_FORMAT, RING_COLOR } from "../constants";
import DatepickerContext from "../contexts/DatepickerContext";
import { dateIsValid, parseFormattedDate } from "../helpers";

import ToggleButton from "./ToggleButton";

type Props = {
  setContextRef?: (ref: React.RefObject<HTMLInputElement>) => void;
};

const Input: React.FC<Props> = (e: Props) => {
  // Context
  const {
    primaryColor,
    period,
    dayHover,
    changeDayHover,
    calendarContainer,
    arrowContainer,
    inputText,
    changeInputText,
    hideDatepicker,
    changeDatepickerValue,
    asSingle,
    placeholder,
    separator,
    disabled,
    inputClassName,
    toggleClassName,
    toggleIcon,
    readOnly,
    displayFormat,
    inputId,
    inputName,
    classNames,
    popoverDirection,
  } = useContext(DatepickerContext);

  // UseRefs
  const buttonRef = useRef<HTMLButtonElement>(null);
  const inputRef = useRef<HTMLInputElement>(null);

  // Functions
  const getClassName = useCallback(() => {
    const input = inputRef.current;

    if (
      input &&
      typeof classNames !== "undefined" &&
      typeof classNames?.input === "function"
    ) {
      return classNames.input(input);
    }

    const border =
      BORDER_COLOR.focus[primaryColor as keyof typeof BORDER_COLOR.focus];
    const ring =
      RING_COLOR["second-focus"][
        primaryColor as keyof (typeof RING_COLOR)["second-focus"]
      ];

    const defaultInputClassName = `c-relative c-transition-all c-duration-300 c-pl-2 c-pr-14 c-w-full c-border-gray-300 dark:c-bg-slate-800 dark:c-text-white/80 dark:c-border-slate-600 c-rounded-lg c-tracking-wide c-font-light c-text-sm c-placeholder-gray-400 c-bg-transparent c-outline-none focus:c-ring-0 disabled:c-opacity-40 disabled:c-cursor-not-allowed ${border} ${ring}`;

    return typeof inputClassName === "function"
      ? inputClassName(defaultInputClassName)
      : typeof inputClassName === "string" && inputClassName !== ""
      ? inputClassName
      : defaultInputClassName;
  }, [inputRef, classNames, primaryColor, inputClassName]);

  const handleInputChange = useCallback(
    (e: React.ChangeEvent<HTMLInputElement>) => {
      const inputValue = e.target.value;

      const dates = [];

      if (asSingle) {
        const date = parseFormattedDate(inputValue, displayFormat);
        if (dateIsValid(date.toDate())) {
          dates.push(date.format(DATE_FORMAT));
        }
      } else {
        const parsed = inputValue.split(separator);

        let startDate = null;
        let endDate = null;

        if (parsed.length === 2) {
          startDate = parseFormattedDate(parsed[0], displayFormat);
          endDate = parseFormattedDate(parsed[1], displayFormat);
        } else {
          const middle = Math.floor(inputValue.length / 2);
          startDate = parseFormattedDate(
            inputValue.slice(0, middle),
            displayFormat
          );
          endDate = parseFormattedDate(inputValue.slice(middle), displayFormat);
        }

        if (
          dateIsValid(startDate.toDate()) &&
          dateIsValid(endDate.toDate()) &&
          startDate.isBefore(endDate)
        ) {
          dates.push(startDate.format(DATE_FORMAT));
          dates.push(endDate.format(DATE_FORMAT));
        }
      }

      if (dates[0]) {
        changeDatepickerValue(
          {
            startDate: dates[0],
            endDate: dates[1] || dates[0],
          },
          e.target
        );
        if (dates[1])
          changeDayHover(dayjs(dates[1]).add(-1, "day").format(DATE_FORMAT));
        else changeDayHover(dates[0]);
      }

      changeInputText(e.target.value);
    },
    [
      asSingle,
      displayFormat,
      separator,
      changeDatepickerValue,
      changeDayHover,
      changeInputText,
    ]
  );

  const handleInputKeyDown = useCallback(
    (e: React.KeyboardEvent<HTMLInputElement>) => {
      if (e.key === "Enter") {
        const input = inputRef.current;
        if (input) {
          input.blur();
        }
        hideDatepicker();
      }
    },
    [hideDatepicker]
  );

  const renderToggleIcon = useCallback(
    (isEmpty: boolean) => {
      return typeof toggleIcon === "undefined" ? (
        <ToggleButton isEmpty={isEmpty} />
      ) : (
        toggleIcon(isEmpty)
      );
    },
    [toggleIcon]
  );

  const getToggleClassName = useCallback(() => {
    const button = buttonRef.current;

    if (
      button &&
      typeof classNames !== "undefined" &&
      typeof classNames?.toggleButton === "function"
    ) {
      return classNames.toggleButton(button);
    }

    const defaultToggleClassName =
      "c-absolute c-right-0 c-h-full c-px-3 c-text-gray-400 focus:c-outline-none disabled:c-opacity-40 disabled:c-cursor-not-allowed";

    return typeof toggleClassName === "function"
      ? toggleClassName(defaultToggleClassName)
      : typeof toggleClassName === "string" && toggleClassName !== ""
      ? toggleClassName
      : defaultToggleClassName;
  }, [toggleClassName, buttonRef, classNames]);

  // UseEffects && UseLayoutEffect
  useEffect(() => {
    if (inputRef && e.setContextRef && typeof e.setContextRef === "function") {
      e.setContextRef(inputRef);
    }
  }, [e, inputRef]);

  useEffect(() => {
    const button = buttonRef?.current;

    function focusInput(e: Event) {
      e.stopPropagation();
      const input = inputRef.current;

      if (input) {
        input.focus();
        if (inputText) {
          changeInputText("");
          if (dayHover) {
            changeDayHover(null);
          }
          if (period.start && period.end) {
            changeDatepickerValue(
              {
                startDate: null,
                endDate: null,
              },
              input
            );
          }
        }
      }
    }

    if (button) {
      button.addEventListener("click", focusInput);
    }

    return () => {
      if (button) {
        button.removeEventListener("click", focusInput);
      }
    };
  }, [
    changeDatepickerValue,
    changeDayHover,
    changeInputText,
    dayHover,
    inputText,
    period.end,
    period.start,
    inputRef,
  ]);

  useEffect(() => {
    const div = calendarContainer?.current;
    const input = inputRef.current;
    const arrow = arrowContainer?.current;

    function showCalendarContainer() {
      if (arrow && div && div.classList.contains("c-hidden")) {
        div.classList.remove("c-hidden");
        div.classList.add("c-block");

        // window.innerWidth === 767
        const popoverOnUp = popoverDirection == "up";
        const popoverOnDown = popoverDirection === "down";
        if (
          popoverOnUp ||
          (window.innerWidth > 767 &&
            window.screen.height - 100 < div.getBoundingClientRect().bottom &&
            !popoverOnDown)
        ) {
          div.classList.add("c-bottom-full");
          div.classList.add("c-mb-2.5");
          div.classList.remove("c-mt-2.5");
          arrow.classList.add("-c-bottom-2");
          arrow.classList.add("c-border-r");
          arrow.classList.add("c-border-b");
          arrow.classList.remove("c-border-l");
          arrow.classList.remove("c-border-t");
        }

        setTimeout(() => {
          div.classList.remove("c-translate-y-4");
          div.classList.remove("c-opacity-0");
          div.classList.add("c-translate-y-0");
          div.classList.add("c-opacity-1");
        }, 1);
      }
    }

    if (div && input) {
      input.addEventListener("focus", showCalendarContainer);
    }

    return () => {
      if (input) {
        input.removeEventListener("focus", showCalendarContainer);
      }
    };
  }, [calendarContainer, arrowContainer, popoverDirection]);

  return (
    <>
      {disabled ? (
        <div className={getClassName()}>{inputText}</div>
      ) : (
        <input
          ref={inputRef}
          type="text"
          className={getClassName()}
          readOnly={readOnly}
          placeholder={
            placeholder
              ? placeholder
              : `${displayFormat}${
                  asSingle ? "" : ` ${separator} ${displayFormat}`
                }`
          }
          value={inputText}
          id={inputId}
          name={inputName}
          autoComplete="off"
          role="presentation"
          onChange={handleInputChange}
          onKeyDown={handleInputKeyDown}
        />
      )}

      {!disabled && (
        <button
          type="button"
          ref={buttonRef}
          disabled={disabled}
          className={getToggleClassName()}
        >
          {renderToggleIcon(inputText == null || !inputText?.length)}
        </button>
      )}
    </>
  );
};

export default Input;