// TODO -- CUSTOM DROPDOWN STYLING

import { useMemo, useCallback, useEffect, useState } from 'react';

const Select = (props) => {
  return (
    <select
      className={`${props.className || ''} text-xs py-0 px-1 h-6`}
      onChange={(e) => props.onChange(e.target.value)}
      value={props.value}>
      {props.list.map((element) => (
        <option key={element.value} value={element.value}>
          {props.labelFunction ? props.labelFunction(element) : element.value}
        </option>
      ))}
    </select>
  );
};

const Checkbox = (props) => {
  return (
    <input
      className={
        props.className + ' rounded-md border-2 text-blue-500 mt-2 w-6 h-6'
      }
      style={props.style}
      type='checkbox'
      onChange={(e) => props.onChange(e.target.checked)}
      defaultChecked={props.value}
      value={props.value}
    />
  );
};

const RAD = Math.PI / 180;
const START_ANGLE = Math.PI * 1.5 - (RAD * 45) / 2;
const END_ANGLE = Math.PI * -0.5 + (RAD * 45) / 2;

function getPointPair(r, angle, distance) {
  return [r + distance * Math.cos(angle), r - distance * Math.sin(angle)];
}

function DialMask({ id, size, startAngle, endAngle }) {
  const r = size / 2;

  const intermediatePoints = [0, 0.25, 0.5, 0.75, 1]
    .map((fraction) =>
      getPointPair(
        r,
        startAngle - (startAngle - endAngle) * fraction,
        r * 4
      ).join(',')
    )
    .join(' ');

  return (
    <mask id={id}>
      <polygon
        style={{ fill: '#fff' }}
        points={`${r},${r} ${intermediatePoints} ${r},${r}`}
      />
    </mask>
  );
}

function getKnobValue(dragStart, currentY, bipolar) {
  const { y, value } = dragStart;
  const deltaY = y - currentY;
  const slope = 0.01;
  let newValue = value + deltaY * slope;
  if (bipolar) {
    const zeroCrossingResistance = 0.2; //0.3
    if (value >= 0 && newValue < 0) {
      newValue += Math.min(zeroCrossingResistance, -newValue);
    } else if (value < 0 && newValue > 0) {
      newValue -= Math.min(zeroCrossingResistance, newValue);
    }
  }
  // Clamp
  return Math.max(bipolar ? -1 : 0, Math.min(1, newValue));
}

let knob_id = 0;

function Knob({
  max = 127,
  dual = false,
  size = 42,
  value = 0,
  fillWidth = 4,
  onChange,
  offset = 0,
}) {
  value = value / max;
  const uid = useMemo(() => knob_id++, []);
  const radius = size / 2;
  const dial_zero = dual ? Math.PI / 2 : START_ANGLE;
  const dial_range = dual
    ? (START_ANGLE - END_ANGLE) / 2
    : START_ANGLE - END_ANGLE;
  const valueAngle = dual
    ? Math.PI / 2 - value * dial_range
    : START_ANGLE - value * dial_range;

  const [lineX1, lineY1] = getPointPair(
    size / 2,
    valueAngle,
    radius - fillWidth + 3
  );

  const [dragStart, setDragStart] = useState(null);
  const isDragging = Boolean(dragStart);

  const onMouseMove = useCallback(
    (e) => {
      if (!dragStart) return;

      const newValue = getKnobValue(dragStart, e.clientY, dual);
      onChange(Math.round(newValue * max));
    },
    [dragStart, onChange, dual, max]
  );
  const onMouseDown = useCallback(
    (e) => {
      if (e.nativeEvent.button !== 0) return;
      e.stopPropagation();
      e.nativeEvent.stopImmediatePropagation();
      setDragStart({ value, y: e.nativeEvent.clientY });
      window.addEventListener('mousemove', onMouseMove);
    },
    [setDragStart, onMouseMove, value]
  );
  const onMouseUp = useCallback(() => {
    setDragStart(null);
  }, [setDragStart]);

  useEffect(() => {
    if (!isDragging) {
      window.removeEventListener('mousemove', onMouseMove);
    }
    window.addEventListener('mousemove', onMouseMove);
    return () => window.removeEventListener('mousemove', onMouseMove);
  }, [isDragging, onMouseMove]);

  useEffect(() => {
    window.addEventListener('mouseup', onMouseUp);
    return () => {
      window.removeEventListener('mouseup', onMouseUp);
    };
  }, [onMouseUp]);

  useEffect(() => {
    if (!onMouseMove) return;
    return () => window.removeEventListener('mousemove', onMouseMove);
  }, [onMouseMove]);

  return (
    <div className='flex flex-col items-center'>
      {/* TOOLTIP */}
      <div
        className={` ${
          isDragging ? 'opacity-100' : 'opacity-0 hidden'
        } transition duration-75 ease-in select-none pointer-events-none absolute -mt-6 bg-gray-800 text-white truncate text-xs box-content rounded text-center w-8 py-0.5`}>
        {Math.round(value * max + offset)}
      </div>
      <svg
        className={` ${
          isDragging ? 'opacity-100' : 'opacity-0 hidden'
        } transition duration-75 ease-in absolute text-gray-800 w-full h-2 -mt-1`}
        x='0px'
        y='0px'
        viewBox='0 0 255 255'
        xmlSpace='preserve'>
        <polygon
          className='fill-current'
          points='0,0 127.5,127.5 255,0'></polygon>
      </svg>
      <div
        style={{
          position: 'relative',
          cursor: 'pointer',
          height: size,
          width: size,
          overflow: 'hidden',
          flexShrink: 0,
        }}
        onMouseDown={onMouseDown}>
        {/* KNOB */}
        <svg className='absolute top-0 left-0' width={size} height={size}>
          <defs>
            <DialMask
              size={size}
              startAngle={START_ANGLE}
              endAngle={END_ANGLE}
              id={`value-track-mask-${uid}`}
            />
            <DialMask
              size={size}
              startAngle={dial_zero}
              endAngle={valueAngle}
              id={`value-mask-${uid}`}
            />
          </defs>
          {/* Track outer */}
          <circle
            cx={size / 2}
            cy={size / 2}
            r={size / 2}
            className='fill-current text-blue-900 opacity-50'
            style={{ mask: `url(#value-track-mask-${uid})` }}
          />
          {/* Value fill */}
          <circle
            cx={size / 2}
            cy={size / 2}
            r={size / 2}
            className='fill-current text-blue-500'
            style={{ mask: `url(#value-mask-${uid})` }}
          />
        </svg>
        <svg
          style={{
            position: 'absolute',
            top: 0,
            left: 0,
          }}>
          {/* Knob */}
          <circle
            cx={radius}
            cy={radius}
            r={radius - fillWidth}
            className='fill-current text-gray-300'
          />
          {/* Highlight */}
          <circle
            cx={radius}
            cy={radius}
            r={radius - fillWidth}
            style={{
              fill: 'transparent',
            }}
          />
          <svg
            width={size}
            height={size}
            style={{
              position: 'absolute',
              top: 0,
              left: 0,
            }}>
            {
              <line
                x1={lineX1}
                y1={lineY1}
                x2={size / 2}
                y2={size / 2}
                strokeLinecap='round'
                strokeWidth='3'
                className='stroke-current text-blue-500'></line>
            }
          </svg>
        </svg>
      </div>
    </div>
  );
}
export { Select, Knob, Checkbox };