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import React from 'react'
import {StyleProp, TextProps as RNTextProps, TextStyle} from 'react-native'
import {UITextView} from 'react-native-uitextview'
import {isNative} from '#/platform/detection'
import {Alf, applyFonts, atoms, flatten, useAlf, useTheme, web} from '#/alf'
export type TextProps = RNTextProps & {
/**
* Lets the user select text, to use the native copy and paste functionality.
*/
selectable?: boolean
}
/**
* Util to calculate lineHeight from a text size atom and a leading atom
*
* Example:
* `leading(atoms.text_md, atoms.leading_normal)` // => 24
*/
export function leading<
Size extends {fontSize?: number},
Leading extends {lineHeight?: number},
>(textSize: Size, leading: Leading) {
const size = textSize?.fontSize || atoms.text_md.fontSize
const lineHeight = leading?.lineHeight || atoms.leading_normal.lineHeight
return Math.round(size * lineHeight)
}
/**
* Ensures that `lineHeight` defaults to a relative value of `1`, or applies
* other relative leading atoms.
*
* If the `lineHeight` value is > 2, we assume it's an absolute value and
* returns it as-is.
*/
export function normalizeTextStyles(
styles: StyleProp<TextStyle>,
{
fontScale,
fontFamily,
}: {
fontScale: number
fontFamily: Alf['fonts']['family']
} & Pick<Alf, 'flags'>,
) {
const s = flatten(styles)
// should always be defined on these components
s.fontSize = (s.fontSize || atoms.text_md.fontSize) * fontScale
if (s?.lineHeight) {
if (s.lineHeight !== 0 && s.lineHeight <= 2) {
s.lineHeight = Math.round(s.fontSize * s.lineHeight)
}
} else if (!isNative) {
s.lineHeight = s.fontSize
}
applyFonts(s, fontFamily)
return s
}
/**
* Our main text component. Use this most of the time.
*/
export function Text({style, selectable, ...rest}: TextProps) {
const {fonts, flags} = useAlf()
const t = useTheme()
const s = normalizeTextStyles([atoms.text_sm, t.atoms.text, flatten(style)], {
fontScale: fonts.scaleMultiplier,
fontFamily: fonts.family,
flags,
})
return <UITextView selectable={selectable} uiTextView style={s} {...rest} />
}
export function createHeadingElement({level}: {level: number}) {
return function HeadingElement({style, ...rest}: TextProps) {
const attr =
web({
role: 'heading',
'aria-level': level,
}) || {}
return <Text {...attr} {...rest} style={style} />
}
}
/*
* Use semantic components when it's beneficial to the user or to a web scraper
*/
export const H1 = createHeadingElement({level: 1})
export const H2 = createHeadingElement({level: 2})
export const H3 = createHeadingElement({level: 3})
export const H4 = createHeadingElement({level: 4})
export const H5 = createHeadingElement({level: 5})
export const H6 = createHeadingElement({level: 6})
export function P({style, ...rest}: TextProps) {
const attr =
web({
role: 'paragraph',
}) || {}
return (
<Text
{...attr}
{...rest}
style={[atoms.text_md, atoms.leading_normal, flatten(style)]}
/>
)
}
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