bsky-social-app/src/components/icons/common.tsx

import React from 'react'
import {StyleSheet, TextProps} from 'react-native'
import type {PathProps, SvgProps} from 'react-native-svg'
import {Defs, LinearGradient, Stop} from 'react-native-svg'
import {nanoid} from 'nanoid/non-secure'

import {tokens} from '#/alf'

export type Props = {
  fill?: PathProps['fill']
  style?: TextProps['style']
  size?: keyof typeof sizes
  gradient?: keyof typeof tokens.gradients
} & Omit<SvgProps, 'style' | 'size'>

export const sizes = {
  xs: 12,
  sm: 16,
  md: 20,
  lg: 24,
  xl: 28,
}

export function useCommonSVGProps(props: Props) {
  const {fill, size, gradient, ...rest} = props
  const style = StyleSheet.flatten(rest.style)
  const _size = Number(size ? sizes[size] : rest.width || sizes.md)
  let _fill = fill || style?.color || tokens.color.blue_500
  let gradientDef = null

  if (gradient && tokens.gradients[gradient]) {
    const id = gradient + '_' + nanoid()
    const config = tokens.gradients[gradient]
    _fill = `url(#${id})`
    gradientDef = (
      <Defs>
        <LinearGradient
          id={id}
          x1="0"
          y1="0"
          x2="100%"
          y2="0"
          gradientTransform="rotate(45)">
          {config.values.map(([stop, fill]) => (
            <Stop key={stop} offset={stop} stopColor={fill} />
          ))}
        </LinearGradient>
      </Defs>
    )
  }

  return {
    fill: _fill,
    size: _size,
    style,
    gradient: gradientDef,
    ...rest,
  }
}