import { useState, useEffect, useRef, forwardRef } from 'react';
import dayjs from 'dayjs';

import { useSettingsStore, useLocaleUpdateStore } from 'stores';

import {
  Wrapper,
  StyledLabel,
  StyledSubLabel,
  Range,
  Handle,
  Selected,
} from './timeRangeFieldStyle';

const times = ['00','01','02','03','04','05','06','07','08','09','10','11','12','13','14','15','16','17','18','19','20','21','22','23','24'];

const TimeRangeField = forwardRef(({
  label,
  subLabel,
  id,
  setValue,
  ...props
}, ref) => {
  const timeFormat = useSettingsStore(state => state.timeFormat);
  const locale = useLocaleUpdateStore(state => state.locale);

  const [start, setStart] = useState(9);
  const [end, setEnd] = useState(17);

  const isStartMoving = useRef(false);
  const isEndMoving = useRef(false);
  const rangeRef = useRef();
  const rangeRect = useRef();

  useEffect(() => {
    if (rangeRef.current) {
      rangeRect.current = rangeRef.current.getBoundingClientRect();
    }
  }, [rangeRef]);

  useEffect(() => setValue(props.name, JSON.stringify({start, end})), [start, end, setValue, props.name]);

  const handleMouseMove = e => {
    if (isStartMoving.current || isEndMoving.current) {
      let step = Math.round(((e.pageX - rangeRect.current.left) / rangeRect.current.width) * 24);
      if (step < 0) step = 0;
      if (step > 24) step = 24;
      step = Math.abs(step);

      if (isStartMoving.current) {
        setStart(step);
      } else if (isEndMoving.current) {
        setEnd(step);
      }
    }
  };

  return (
    <Wrapper locale={locale}>
      {label && <StyledLabel htmlFor={id}>{label}</StyledLabel>}
      {subLabel && <StyledSubLabel htmlFor={id}>{subLabel}</StyledSubLabel>}
      <input
        id={id}
        type="hidden"
        value={JSON.stringify({start, end})}
        ref={ref}
        {...props}
      />

      <Range ref={rangeRef}>
        <Selected start={start} end={start > end ? 24 : end} />
        {start > end && <Selected start={start > end ? 0 : start} end={end} />}
        <Handle
          value={start}
          label={timeFormat === '24h' ? times[start] : dayjs().hour(times[start]).format('ha')}
          extraPadding={end - start === 1 ? 'padding-right: 20px;' : (start - end === 1 ? 'padding-left: 20px;' : '')}
          onMouseDown={() => {
            document.addEventListener('mousemove', handleMouseMove);
            isStartMoving.current = true;

            document.addEventListener('mouseup', () => {
              isStartMoving.current = false;
              document.removeEventListener('mousemove', handleMouseMove);
            }, { once: true });
          }}
          onTouchMove={(e) => {
            const touch = e.targetTouches[0];

            let step = Math.round(((touch.pageX - rangeRect.current.left) / rangeRect.current.width) * 24);
            if (step < 0) step = 0;
            if (step > 24) step = 24;
            step = Math.abs(step);
            setStart(step);
          }}
          tabIndex="0"
          onKeyDown={e => {
            if (e.key === 'ArrowLeft' || e.key === 'ArrowUp') {
              e.preventDefault();
              setStart(Math.max(start-1, 0));
            }
            if (e.key === 'ArrowRight' || e.key === 'ArrowDown') {
              e.preventDefault();
              setStart(Math.min(start+1, 24));
            }
          }}
        />
        <Handle
          value={end}
          label={timeFormat === '24h' ? times[end] : dayjs().hour(times[end]).format('ha')}
          extraPadding={end - start === 1 ? 'padding-left: 20px;' : (start - end === 1 ? 'padding-right: 20px;' : '')}
          onMouseDown={() => {
            document.addEventListener('mousemove', handleMouseMove);
            isEndMoving.current = true;

            document.addEventListener('mouseup', () => {
              isEndMoving.current = false;
              document.removeEventListener('mousemove', handleMouseMove);
            }, { once: true });
          }}
          onTouchMove={(e) => {
            const touch = e.targetTouches[0];

            let step = Math.round(((touch.pageX - rangeRect.current.left) / rangeRect.current.width) * 24);
            if (step < 0) step = 0;
            if (step > 24) step = 24;
            step = Math.abs(step);
            setEnd(step);
          }}
          tabIndex="0"
          onKeyDown={e => {
            if (e.key === 'ArrowLeft' || e.key === 'ArrowUp') {
              e.preventDefault();
              setEnd(Math.max(end-1, 0));
            }
            if (e.key === 'ArrowRight' || e.key === 'ArrowDown') {
              e.preventDefault();
              setEnd(Math.min(end+1, 24));
            }
          }}
        />
      </Range>
    </Wrapper>
  );
});

export default TimeRangeField;