import React, { useCallback, useMemo, useState } from 'react'
import {
  Platform,
  StyleSheet,
  TextInputChangeEvent,
  TextInputContentSizeChangeEvent,
  TextInputProps,
  View,
} from 'react-native'
import { TextInput } from 'react-native-gesture-handler'
import { Color } from './Color'
import { useColorScheme } from './hooks/useColorScheme'
import stylesCommon, { getColorSchemeStyle } from './styles'

export interface ComposerProps {
  composerHeight?: number
  text?: string
  textInputProps?: Partial<TextInputProps>
}

export function Composer ({
  text = '',
  textInputProps,
}: ComposerProps): React.ReactElement {
  const colorScheme = useColorScheme()
  const isDark = colorScheme === 'dark'

  const placeholder = textInputProps?.placeholder ?? 'Type a message...'

  const minHeight = useMemo(() =>
    Platform.select({
      web: styles.textInput.lineHeight + styles.textInput.paddingTop + styles.textInput.paddingBottom,
      default: undefined,
    })
  , [])

  const [height, setHeight] = useState<number | undefined>(minHeight)

  const handleContentSizeChange = useMemo(() => {
    if (Platform.OS === 'web')
      return (e: TextInputContentSizeChangeEvent) => {
        const contentHeight = e.nativeEvent.contentSize.height
        setHeight(Math.max(minHeight ?? 0, contentHeight))
      }

    return undefined
  }, [minHeight])

  const handleChange = useCallback((event: TextInputChangeEvent) => {
    if (Platform.OS === 'web')
      // Reset height to 0 to get the correct scrollHeight
      requestAnimationFrame(() => {
        // @ts-expect-error - web-specific code
        event.nativeEvent.target.style.height = '0px'
        // @ts-expect-error - web-specific code
        event.nativeEvent.target.style.height = `${event.nativeEvent.target.scrollHeight}px`
      })
  }, [])

  return (
    <View style={stylesCommon.fill}>
      <TextInput
        testID={placeholder}
        accessible
        accessibilityLabel={placeholder}
        placeholderTextColor={textInputProps?.placeholderTextColor ?? (isDark ? '#888' : Color.defaultColor)}
        value={text}
        enablesReturnKeyAutomatically
        underlineColorAndroid='transparent'
        keyboardAppearance={isDark ? 'dark' : 'default'}
        multiline
        placeholder={placeholder}
        onContentSizeChange={handleContentSizeChange}
        onChange={handleChange}
        {...textInputProps}
        style={[getColorSchemeStyle(styles, 'textInput', colorScheme), stylesWeb.textInput, { height }, textInputProps?.style]}
      />
    </View>
  )
}

const styles = StyleSheet.create({
  textInput: {
    fontSize: 16,
    lineHeight: 22,
    paddingTop: 8,
    paddingBottom: 10,
    paddingHorizontal: 8,
  },
  textInput_dark: {
    color: '#fff',
  },
})

const stylesWeb = StyleSheet.create({
  textInput: {
    /* @ts-expect-error - web-specific styles */
    outlineStyle: 'none',
  },
})