import * as React from "react";
import {
  KeyboardEvent,
  useCallback,
  useEffect,
  useRef,
  useState,
  WheelEvent,
} from "react";

import "./range-component.scss";

interface Props {
  handleChange: (value: number) => void;
  defaultValue: number;
}

const MAX = 55;

export const RangeComponent: React.FC<Props> = ({
  handleChange,
  defaultValue,
}: Props) => {
  const [isPressed, setPressed] = useState(false);
  const [position, setPosition] = useState(defaultValue * MAX);

  const stick = useRef<HTMLDivElement>(null);

  const handleFocus = useCallback(() => setPressed(true), []);
  const handleFree = useCallback(() => setPressed(false), []);

  const limiter = (value: number, width: number) => {
    let diff = value;
    if (diff > width - 35) {
      diff = MAX;
    } else if (diff < 0) {
      diff = 0;
    }
    return diff;
  };

  const handleKeyDown = (e: KeyboardEvent) => {
    if (!stick || !stick.current || !stick.current.parentNode) {
      return;
    }

    const handleChangePosition = (value: number): void => {
      setPosition(value);
      handleChange(value / MAX);
    };

    const { width } = (stick.current
      .parentNode as HTMLDivElement).getBoundingClientRect();
    switch (e.keyCode) {
      case 37:
        handleChangePosition(limiter(position - 5, width));
        break;
      case 39:
        handleChangePosition(limiter(position + 5, width));
        break;
      default:
        break;
    }
  };

  const handlePoint = useCallback(
    (e: React.MouseEvent | MouseEvent) => {
      if (!stick || !stick.current || !stick.current.parentNode) {
        return;
      }
      const { width, left } = (stick.current
        .parentNode as HTMLDivElement).getBoundingClientRect();
      const { clientX } = e;
      const value = clientX - left - 20;
      const diff = limiter(value, width);

      setPosition(diff);
      handleChange(diff / MAX);
    },
    [stick, handleChange]
  );

  const handleMouseMove = useCallback(
    (e: MouseEvent) => {
      if (!isPressed) {
        return;
      }
      handlePoint(e);
    },
    [isPressed, handlePoint]
  );

  const handleTouchMove = useCallback(
    (e: TouchEvent) => {
      if (!isPressed) {
        return;
      }
      const { touches } = e;
      const { clientX } = touches[0];

      if (!stick || !stick.current || !stick.current.parentNode) {
        return;
      }
      const { width, left } = (stick.current
        .parentNode as HTMLDivElement).getBoundingClientRect();

      const value = clientX - left - 20;
      const diff = limiter(value, width);

      setPosition(diff);
      handleChange(diff / MAX);
    },
    [isPressed, stick, handleChange]
  );

  const handleScroll = (e: WheelEvent) => {
    if (!stick || !stick.current || !stick.current.parentNode) {
      return;
    }
    const range = stick.current.parentNode as HTMLDivElement;
    const { width } = range.getBoundingClientRect();
    range.focus();
    const { deltaY } = e;
    const value = position + (deltaY > 0 ? -5 : 5);
    const diff = limiter(value, width);

    setPosition(diff);
    handleChange(diff / MAX);
  };

  useEffect(() => {
    window.addEventListener("mousemove", handleMouseMove);
    window.addEventListener("mouseup", handleFree);
    window.addEventListener("touchmove", handleTouchMove);
    window.addEventListener("touchend", handleFree);
    return () => {
      window.removeEventListener("mousemove", handleMouseMove);
      window.removeEventListener("mouseup", handleFree);
      window.removeEventListener("touchmove", handleTouchMove);
      window.removeEventListener("touchend", handleFree);
    };
  }, [handleMouseMove, handleTouchMove, handleFree]);

  return (
    <div
      tabIndex={0}
      onKeyDown={handleKeyDown}
      onMouseDown={handleFocus}
      onClick={handlePoint}
      onTouchStart={handleFocus}
      onWheel={handleScroll}
      className="range"
    >
      <div
        ref={stick}
        style={{
          left: `${position}px`,
        }}
        className="range-stick"
      />
    </div>
  );
};

RangeComponent.displayName = "RangeComponent";