import React, { useEffect, useRef, useState } from 'react'
import { Dimensions, FlatList, Text, View } from 'react-native'
import SegmentedControl from '@react-native-community/segmented-control'
import { createNativeStackNavigator } from 'react-native-screens/native-stack'
import { useSelector } from 'react-redux'
import { Feather } from '@expo/vector-icons'

import Timeline from './Timelines/Timeline'
import sharedScreens from 'src/screens/Shared/sharedScreens'
import { InstancesState } from 'src/utils/slices/instancesSlice'
import { RootState } from 'src/store'
import { useTheme } from 'src/utils/styles/ThemeManager'

const Stack = createNativeStackNavigator()

const Page = ({
  item: { page },
  localRegistered
}: {
  item: { page: App.Pages }
  localRegistered: InstancesState['local']['url'] | undefined
}) => {
  return (
    <View style={{ width: Dimensions.get('window').width }}>
      {localRegistered || page === 'RemotePublic' ? (
        <Timeline page={page} />
      ) : (
        <Text>请先登录</Text>
      )}
    </View>
  )
}

export interface Props {
  name: string
  content: { title: string; page: App.Pages }[]
}

const Timelines: React.FC<Props> = ({ name, content }) => {
  const { theme } = useTheme()
  const localRegistered = useSelector(
    (state: RootState) => state.instances.local.url
  )
  const [segment, setSegment] = useState(0)
  const [renderHeader, setRenderHeader] = useState(false)
  const [segmentManuallyTriggered, setSegmentManuallyTriggered] = useState(
    false
  )

  useEffect(() => {
    const nbr = setTimeout(() => setRenderHeader(true), 50)
    return
  }, [])

  const horizontalPaging = useRef<FlatList>(null!)

  return (
    <Stack.Navigator>
      <Stack.Screen
        name={name}
        options={{
          headerRight: () =>
            renderHeader ? (
              <Feather name='search' size={24} color={theme.secondary} />
            ) : null,
          headerCenter: () =>
            renderHeader ? (
              <SegmentedControl
                values={[content[0].title, content[1].title]}
                selectedIndex={segment}
                onChange={({ nativeEvent }) => {
                  setSegmentManuallyTriggered(true)
                  setSegment(nativeEvent.selectedSegmentIndex)
                  horizontalPaging.current.scrollToIndex({
                    index: nativeEvent.selectedSegmentIndex
                  })
                }}
                style={{ width: 150, height: 30 }}
              />
            ) : null
        }}
      >
        {() => (
          <FlatList
            style={{ width: Dimensions.get('window').width, height: '100%' }}
            data={content}
            extraData={localRegistered}
            keyExtractor={({ page }) => page}
            renderItem={({ item, index }) => (
              <Page key={index} item={item} localRegistered={localRegistered} />
            )}
            ref={horizontalPaging}
            bounces={false}
            getItemLayout={(data, index) => ({
              length: Dimensions.get('window').width,
              offset: Dimensions.get('window').width * index,
              index
            })}
            horizontal
            onMomentumScrollEnd={() => setSegmentManuallyTriggered(false)}
            onScroll={({ nativeEvent }) =>
              !segmentManuallyTriggered &&
              setSegment(
                nativeEvent.contentOffset.x <=
                  Dimensions.get('window').width / 2
                  ? 0
                  : 1
              )
            }
            pagingEnabled
            showsHorizontalScrollIndicator={false}
          />
        )}
      </Stack.Screen>

      {sharedScreens(Stack)}
    </Stack.Navigator>
  )
}

export default Timelines