import React from 'react';
import { View } from 'react-native';
import Animated, { useAnimatedStyle, useDerivedValue, useSharedValue, withTiming } from 'react-native-reanimated';

import colorKit from '../../../colorKit/index';
import usePickerContext from '../../../AppContext';
import { SliderCore } from '../SliderCore';
import Thumb from '../../Thumb/Thumb';
import { getStyle, isRtl, isWeb, RenderNativeOnly } from '../../../utils';

import type { SliderProps } from '../../../types';

/** @see [GreenSlider](https://alabsi91.github.io/reanimated-color-picker/api/sliders/rgb/green-slider/) */
export function GreenSlider({ gestures = [], style = {}, vertical = false, reverse = false, ...props }: SliderProps) {
  const { hueValue, saturationValue, brightnessValue, onGestureChange, onGestureEnd, ...ctx } = usePickerContext();

  const thumbShape = props.thumbShape ?? ctx.thumbShape;
  const thumbSize = props.thumbSize ?? ctx.thumbSize;
  const thumbColor = props.thumbColor ?? ctx.thumbColor;
  const boundedThumb = props.boundedThumb ?? ctx.boundedThumb;
  const renderThumb = props.renderThumb ?? ctx.renderThumb;
  const thumbStyle = props.thumbStyle ?? ctx.thumbStyle ?? {};
  const thumbInnerStyle = props.thumbInnerStyle ?? ctx.thumbInnerStyle ?? {};
  const thumbScaleAnimationValue = props.thumbScaleAnimationValue ?? ctx.thumbScaleAnimationValue;
  const thumbScaleAnimationDuration = props.thumbScaleAnimationDuration ?? ctx.thumbScaleAnimationDuration;
  const adaptSpectrum = props.adaptSpectrum ?? ctx.adaptSpectrum;
  const sliderThickness = props.sliderThickness ?? ctx.sliderThickness;

  const borderRadius = getStyle(style, 'borderRadius') ?? 5;
  const widthStyle = getStyle(style, 'width');
  const heightStyle = getStyle(style, 'height');

  const width = useSharedValue(vertical ? sliderThickness : typeof widthStyle === 'number' ? widthStyle : 0);
  const height = useSharedValue(!vertical ? sliderThickness : typeof heightStyle === 'number' ? heightStyle : 0);
  const handleScale = useSharedValue(1);
  const greenValue = useSharedValue(0);

  const rgb = useDerivedValue(() => {
    const currentHsvColor = { h: hueValue.value, s: saturationValue.value, v: brightnessValue.value };
    const rgbColor = colorKit.runOnUI().RGB(currentHsvColor).object(false);
    greenValue.value = rgbColor.g;
    return rgbColor;
  }, [hueValue, saturationValue, brightnessValue, greenValue]);

  const thumbAnimatedStyle = useAnimatedStyle(() => {
    const length = (vertical ? height.value : width.value) - (boundedThumb ? thumbSize : 0);
    const percent = (rgb.value.g / 255) * length;
    const pos = (reverse ? length - percent : percent) - (boundedThumb ? 0 : thumbSize / 2);
    const posY = vertical ? pos : height.value / 2 - thumbSize / 2;
    const posX = vertical ? width.value / 2 - thumbSize / 2 : pos;

    return {
      transform: [{ translateY: posY }, { translateX: posX }, { scale: handleScale.value }],
    };
  }, [rgb, width, height, handleScale, vertical, reverse, boundedThumb, thumbSize]);

  const imageStyle = useAnimatedStyle(() => {
    if (isWeb) {
      return {};
    }

    const imageRotate = vertical ? (reverse ? '90deg' : '270deg') : reverse ? '0deg' : '180deg';
    const imageTranslateY = ((height.value - width.value) / 2) * ((reverse && isRtl) || (!reverse && !isRtl) ? -1 : 1);
    const tintColor = adaptSpectrum ? `rgb(${Math.round(rgb.value.r)}, 255, ${Math.round(rgb.value.b)})` : 'rgb(0, 255, 0)';

    return {
      tintColor,
      width: vertical ? height.value : '100%',
      height: vertical ? width.value : '100%',
      transform: [
        { rotate: imageRotate },
        { translateX: vertical ? ((height.value - width.value) / 2) * (reverse ? 1 : -1) : 0 },
        { translateY: vertical ? imageTranslateY : 0 },
      ],
    };
  }, [rgb, width, height, adaptSpectrum, vertical, reverse]);

  const sliderBackground = useAnimatedStyle(() => {
    const r = Math.round(rgb.value.r);
    const b = Math.round(rgb.value.b);

    if (isWeb) {
      const deg = vertical ? (reverse ? 180 : 0) : reverse ? 90 : 270;
      return {
        background: adaptSpectrum
          ? `linear-gradient(${deg}deg, rgb(${r}, 255, ${b}) 0%, rgb(${r}, 0, ${b}) 100%)`
          : `linear-gradient(${deg}deg, rgb(0, 255, 0) 0%, rgb(0, 0, 0) 100%)`,
      };
    }

    return {
      backgroundColor: adaptSpectrum ? `rgb(${r}, 0, ${b})` : 'rgb(0, 0, 0)',
    };
  }, [rgb, adaptSpectrum]);

  const onBegin = () => {
    'worklet';
    handleScale.value = withTiming(thumbScaleAnimationValue, { duration: thumbScaleAnimationDuration });
  };

  const onUpdate = (newValue: number) => {
    'worklet';

    const { h, s, v } = colorKit.runOnUI().HSV({ r: rgb.value.r, g: newValue, b: rgb.value.b }).object(false);

    if (hueValue.value === h && saturationValue.value === s && brightnessValue.value === v) {
      return;
    }

    hueValue.value = h;
    saturationValue.value = s;
    brightnessValue.value = v;

    onGestureChange();
  };

  const onEnd = () => {
    'worklet';
    handleScale.value = withTiming(1, { duration: thumbScaleAnimationDuration });
    onGestureEnd();
  };

  const getAdaptiveColor = (hsva: { h: number; s: number; v: number; a: number }) => {
    'worklet';

    if (adaptSpectrum) {
      return hsva;
    }

    return { r: 0, g: rgb.value.g, b: 0 };
  };

  return (
    <SliderCore
      style={[style, { position: 'relative', borderRadius, borderWidth: 0, padding: 0 }, sliderBackground]}
      maxValue={255}
      label={props.accessibilityHint ?? 'Green Slider'}
      hint={props.accessibilityHint}
      currentValue={greenValue}
      width={width}
      height={height}
      thumbSize={thumbSize}
      boundedThumb={boundedThumb}
      sliderThickness={sliderThickness}
      gestures={gestures}
      vertical={vertical}
      reverse={reverse}
      onBegin={onBegin}
      onUpdate={onUpdate}
      onEnd={onEnd}
    >
      <RenderNativeOnly>
        <View style={{ flex: 1, borderRadius, overflow: 'hidden' }} aria-hidden>
          <Animated.Image source={require('../../../assets/blackGradient.png')} style={imageStyle} />
        </View>
      </RenderNativeOnly>

      <Thumb
        thumbShape={thumbShape}
        thumbSize={thumbSize}
        thumbColor={thumbColor}
        renderThumb={renderThumb}
        innerStyle={thumbInnerStyle}
        thumbAnimatedStyle={thumbAnimatedStyle}
        style={thumbStyle}
        vertical={vertical}
        getAdaptiveColor={getAdaptiveColor}
      />
    </SliderCore>
  );
}