import React, { ReactNode, useReducer } from 'react'
import { Alert, Pressable, Text } from 'react-native'
import { createNativeStackNavigator } from 'react-native-screens/native-stack'
import { useNavigation } from '@react-navigation/native'

import PostMain from './PostToot/PostMain'
import client from 'src/api/client'

const Stack = createNativeStackNavigator()

export type PostState = {
  text: {
    count: number
    raw: string
    formatted: ReactNode
  }
  selection: { start: number; end: number }
  overlay: null | 'suggestions' | 'emojis'
  tag:
    | {
        type: 'url' | 'accounts' | 'hashtags'
        text: string
        offset: number
      }
    | undefined
  emojis: mastodon.Emoji[] | undefined
  height: {
    view: number
    editor: number
    keyboard: number
  }
}

export type PostAction =
  | {
      type: 'text'
      payload: Partial<PostState['text']>
    }
  | {
      type: 'selection'
      payload: PostState['selection']
    }
  | {
      type: 'overlay'
      payload: PostState['overlay']
    }
  | {
      type: 'tag'
      payload: PostState['tag']
    }
  | {
      type: 'emojis'
      payload: PostState['emojis']
    }
  | {
      type: 'height'
      payload: Partial<PostState['height']>
    }

const postInitialState: PostState = {
  text: {
    count: 0,
    raw: '',
    formatted: undefined
  },
  selection: { start: 0, end: 0 },
  overlay: null,
  tag: undefined,
  emojis: undefined,
  height: {
    view: 0,
    editor: 0,
    keyboard: 0
  }
}
const postReducer = (state: PostState, action: PostAction): PostState => {
  switch (action.type) {
    case 'text':
      return { ...state, text: { ...state.text, ...action.payload } }
    case 'selection':
      return { ...state, selection: action.payload }
    case 'overlay':
      return { ...state, overlay: action.payload }
    case 'tag':
      return { ...state, tag: action.payload }
    case 'emojis':
      return { ...state, emojis: action.payload }
    case 'height':
      return { ...state, height: { ...state.height, ...action.payload } }
    default:
      throw new Error('Unexpected action')
  }
}

const PostToot: React.FC = () => {
  const navigation = useNavigation()

  const [postState, postDispatch] = useReducer(postReducer, postInitialState)

  return (
    <Stack.Navigator>
      <Stack.Screen
        name='PostMain'
        options={{
          headerLeft: () => (
            <Pressable
              onPress={() =>
                Alert.alert('确认取消编辑？', '', [
                  { text: '继续编辑', style: 'cancel' },
                  {
                    text: '退出编辑',
                    style: 'destructive',
                    onPress: () => navigation.goBack()
                  }
                ])
              }
            >
              <Text>退出编辑</Text>
            </Pressable>
          ),
          headerCenter: () => <></>,
          headerRight: () => (
            <Pressable
              onPress={async () => {
                if (postState.text.count < 0) {
                  Alert.alert('字数超限', '', [
                    {
                      text: '返回继续编辑'
                    }
                  ])
                } else {
                  const res = await client({
                    method: 'post',
                    instance: 'local',
                    endpoint: 'statuses',
                    headers: {
                      'Idempotency-Key':
                        Date.now().toString() + Math.random().toString()
                    },
                    query: { status: postState.text.raw }
                  })
                  if (res.body.id) {
                    Alert.alert('发布成功', '', [
                      {
                        text: '好的',
                        onPress: () => navigation.goBack()
                      }
                    ])
                  } else {
                    Alert.alert('发布失败', '', [
                      {
                        text: '返回重试'
                      }
                    ])
                  }
                }
              }}
            >
              <Text>发嘟嘟</Text>
            </Pressable>
          )
        }}
      >
        {props => (
          <PostMain postState={postState} postDispatch={postDispatch} />
        )}
      </Stack.Screen>
    </Stack.Navigator>
  )
}

export default PostToot