import React, {useState} from 'react'
import {
  ActivityIndicator,
  Linking,
  StyleProp,
  StyleSheet,
  View,
  ViewStyle,
} from 'react-native'
import {AppBskyFeedPost as FeedPost} from '@atproto/api'
import {observer} from 'mobx-react-lite'
import Clipboard from '@react-native-clipboard/clipboard'
import {AtUri} from '@atproto/api'
import {FontAwesomeIcon} from '@fortawesome/react-native-fontawesome'
import {PostThreadModel} from 'state/models/content/post-thread'
import {PostThreadItemModel} from 'state/models/content/post-thread-item'
import {Link} from '../util/Link'
import {UserInfoText} from '../util/UserInfoText'
import {PostMeta} from '../util/PostMeta'
import {PostEmbeds} from '../util/post-embeds'
import {PostCtrls} from '../util/post-ctrls/PostCtrls'
import {ContentHider} from '../util/moderation/ContentHider'
import {PostAlerts} from '../util/moderation/PostAlerts'
import {Text} from '../util/text/Text'
import {RichText} from '../util/text/RichText'
import * as Toast from '../util/Toast'
import {PreviewableUserAvatar} from '../util/UserAvatar'
import {useStores} from 'state/index'
import {s, colors} from 'lib/styles'
import {usePalette} from 'lib/hooks/usePalette'
import {getTranslatorLink} from '../../../locale/helpers'
import {makeProfileLink} from 'lib/routes/links'

export const Post = observer(function PostImpl({
  view,
  showReplyLine,
  hideError,
  style,
}: {
  view: PostThreadModel
  showReplyLine?: boolean
  hideError?: boolean
  style?: StyleProp<ViewStyle>
}) {
  const pal = usePalette('default')
  const [deleted, setDeleted] = useState(false)

  // deleted
  // =
  if (deleted) {
    return <View />
  }

  // loading
  // =
  if (!view.hasContent && view.isLoading) {
    return (
      <View style={pal.view}>
        <ActivityIndicator />
      </View>
    )
  }

  // error
  // =
  if (view.hasError || !view.thread || !view.thread?.postRecord) {
    if (hideError) {
      return <View />
    }
    return (
      <View style={pal.view}>
        <Text>{view.error || 'Thread not found'}</Text>
      </View>
    )
  }

  // loaded
  // =

  return (
    <PostLoaded
      item={view.thread}
      record={view.thread.postRecord}
      setDeleted={setDeleted}
      showReplyLine={showReplyLine}
      style={style}
    />
  )
})

const PostLoaded = observer(function PostLoadedImpl({
  item,
  record,
  setDeleted,
  showReplyLine,
  style,
}: {
  item: PostThreadItemModel
  record: FeedPost.Record
  setDeleted: (v: boolean) => void
  showReplyLine?: boolean
  style?: StyleProp<ViewStyle>
}) {
  const pal = usePalette('default')
  const store = useStores()

  const itemUri = item.post.uri
  const itemCid = item.post.cid
  const itemUrip = new AtUri(item.post.uri)
  const itemHref = makeProfileLink(item.post.author, 'post', itemUrip.rkey)
  const itemTitle = `Post by ${item.post.author.handle}`
  let replyAuthorDid = ''
  if (record.reply) {
    const urip = new AtUri(record.reply.parent?.uri || record.reply.root.uri)
    replyAuthorDid = urip.hostname
  }

  const translatorUrl = getTranslatorLink(record?.text || '')

  const onPressReply = React.useCallback(() => {
    store.shell.openComposer({
      replyTo: {
        uri: item.post.uri,
        cid: item.post.cid,
        text: record.text as string,
        author: {
          handle: item.post.author.handle,
          displayName: item.post.author.displayName,
          avatar: item.post.author.avatar,
        },
      },
    })
  }, [store, item, record])

  const onPressToggleRepost = React.useCallback(() => {
    return item
      .toggleRepost()
      .catch(e => store.log.error('Failed to toggle repost', e))
  }, [item, store])

  const onPressToggleLike = React.useCallback(() => {
    return item
      .toggleLike()
      .catch(e => store.log.error('Failed to toggle like', e))
  }, [item, store])

  const onCopyPostText = React.useCallback(() => {
    Clipboard.setString(record.text)
    Toast.show('Copied to clipboard')
  }, [record])

  const onOpenTranslate = React.useCallback(() => {
    Linking.openURL(translatorUrl)
  }, [translatorUrl])

  const onToggleThreadMute = React.useCallback(async () => {
    try {
      await item.toggleThreadMute()
      if (item.isThreadMuted) {
        Toast.show('You will no longer receive notifications for this thread')
      } else {
        Toast.show('You will now receive notifications for this thread')
      }
    } catch (e) {
      store.log.error('Failed to toggle thread mute', e)
    }
  }, [item, store])

  const onDeletePost = React.useCallback(() => {
    item.delete().then(
      () => {
        setDeleted(true)
        Toast.show('Post deleted')
      },
      e => {
        store.log.error('Failed to delete post', e)
        Toast.show('Failed to delete post, please try again')
      },
    )
  }, [item, setDeleted, store])

  return (
    <Link href={itemHref} style={[styles.outer, pal.view, pal.border, style]}>
      {showReplyLine && <View style={styles.replyLine} />}
      <View style={styles.layout}>
        <View style={styles.layoutAvi}>
          <PreviewableUserAvatar
            size={52}
            did={item.post.author.did}
            handle={item.post.author.handle}
            avatar={item.post.author.avatar}
            moderation={item.moderation.avatar}
          />
        </View>
        <View style={styles.layoutContent}>
          <PostMeta
            author={item.post.author}
            authorHasWarning={!!item.post.author.labels?.length}
            timestamp={item.post.indexedAt}
            postHref={itemHref}
          />
          {replyAuthorDid !== '' && (
            <View style={[s.flexRow, s.mb2, s.alignCenter]}>
              <FontAwesomeIcon
                icon="reply"
                size={9}
                style={[pal.textLight, s.mr5]}
              />
              <Text
                type="sm"
                style={[pal.textLight, s.mr2]}
                lineHeight={1.2}
                numberOfLines={1}>
                Reply to{' '}
                <UserInfoText
                  type="sm"
                  did={replyAuthorDid}
                  attr="displayName"
                  style={[pal.textLight]}
                />
              </Text>
            </View>
          )}
          <ContentHider
            moderation={item.moderation.content}
            style={styles.contentHider}
            childContainerStyle={styles.contentHiderChild}>
            <PostAlerts
              moderation={item.moderation.content}
              style={styles.alert}
            />
            {item.richText?.text ? (
              <View style={styles.postTextContainer}>
                <RichText
                  testID="postText"
                  type="post-text"
                  richText={item.richText}
                  lineHeight={1.3}
                  style={s.flex1}
                />
              </View>
            ) : undefined}
            {item.post.embed ? (
              <ContentHider
                moderation={item.moderation.embed}
                style={styles.contentHider}>
                <PostEmbeds
                  embed={item.post.embed}
                  moderation={item.moderation.embed}
                />
              </ContentHider>
            ) : null}
          </ContentHider>
          <PostCtrls
            itemUri={itemUri}
            itemCid={itemCid}
            itemHref={itemHref}
            itemTitle={itemTitle}
            author={item.post.author}
            indexedAt={item.post.indexedAt}
            text={item.richText?.text || record.text}
            isAuthor={item.post.author.did === store.me.did}
            replyCount={item.post.replyCount}
            repostCount={item.post.repostCount}
            likeCount={item.post.likeCount}
            isReposted={!!item.post.viewer?.repost}
            isLiked={!!item.post.viewer?.like}
            isThreadMuted={item.isThreadMuted}
            onPressReply={onPressReply}
            onPressToggleRepost={onPressToggleRepost}
            onPressToggleLike={onPressToggleLike}
            onCopyPostText={onCopyPostText}
            onOpenTranslate={onOpenTranslate}
            onToggleThreadMute={onToggleThreadMute}
            onDeletePost={onDeletePost}
          />
        </View>
      </View>
    </Link>
  )
})

const styles = StyleSheet.create({
  outer: {
    paddingTop: 10,
    paddingRight: 15,
    paddingBottom: 5,
    paddingLeft: 10,
    borderTopWidth: 1,
    cursor: 'pointer',
  },
  layout: {
    flexDirection: 'row',
  },
  layoutAvi: {
    width: 70,
    paddingLeft: 8,
  },
  layoutContent: {
    flex: 1,
  },
  alert: {
    marginBottom: 6,
  },
  postTextContainer: {
    flexDirection: 'row',
    alignItems: 'center',
    flexWrap: 'wrap',
  },
  replyLine: {
    position: 'absolute',
    left: 36,
    top: 70,
    bottom: 0,
    borderLeftWidth: 2,
    borderLeftColor: colors.gray2,
  },
  contentHider: {
    marginBottom: 2,
  },
  contentHiderChild: {
    marginTop: 6,
  },
})