import React from 'react'
import {View} from 'react-native'
import {Image} from 'expo-image'
import {
  AppBskyGraphDefs,
  AppBskyGraphStarterpack,
  AtUri,
  type ModerationOpts,
  RichText as RichTextAPI,
} from '@atproto/api'
import {FontAwesomeIcon} from '@fortawesome/react-native-fontawesome'
import {msg, Plural, Trans} from '@lingui/macro'
import {useLingui} from '@lingui/react'
import {useNavigation} from '@react-navigation/native'
import {type NativeStackScreenProps} from '@react-navigation/native-stack'
import {useQueryClient} from '@tanstack/react-query'

import {batchedUpdates} from '#/lib/batchedUpdates'
import {HITSLOP_20} from '#/lib/constants'
import {isBlockedOrBlocking, isMuted} from '#/lib/moderation/blocked-and-muted'
import {makeProfileLink, makeStarterPackLink} from '#/lib/routes/links'
import {
  type CommonNavigatorParams,
  type NavigationProp,
} from '#/lib/routes/types'
import {logEvent} from '#/lib/statsig/statsig'
import {cleanError} from '#/lib/strings/errors'
import {getStarterPackOgCard} from '#/lib/strings/starter-pack'
import {logger} from '#/logger'
import {isWeb} from '#/platform/detection'
import {updateProfileShadow} from '#/state/cache/profile-shadow'
import {useModerationOpts} from '#/state/preferences/moderation-opts'
import {getAllListMembers} from '#/state/queries/list-members'
import {useResolvedStarterPackShortLink} from '#/state/queries/resolve-short-link'
import {useResolveDidQuery} from '#/state/queries/resolve-uri'
import {useShortenLink} from '#/state/queries/shorten-link'
import {useDeleteStarterPackMutation} from '#/state/queries/starter-packs'
import {useStarterPackQuery} from '#/state/queries/starter-packs'
import {useAgent, useSession} from '#/state/session'
import {useLoggedOutViewControls} from '#/state/shell/logged-out'
import {
  ProgressGuideAction,
  useProgressGuideControls,
} from '#/state/shell/progress-guide'
import {useSetActiveStarterPack} from '#/state/shell/starter-pack'
import {PagerWithHeader} from '#/view/com/pager/PagerWithHeader'
import {ProfileSubpageHeader} from '#/view/com/profile/ProfileSubpageHeader'
import * as Toast from '#/view/com/util/Toast'
import {bulkWriteFollows} from '#/screens/Onboarding/util'
import {atoms as a, useBreakpoints, useTheme} from '#/alf'
import {Button, ButtonIcon, ButtonText} from '#/components/Button'
import {useDialogControl} from '#/components/Dialog'
import {ArrowOutOfBoxModified_Stroke2_Corner2_Rounded as ArrowOutOfBoxIcon} from '#/components/icons/ArrowOutOfBox'
import {ChainLink_Stroke2_Corner0_Rounded as ChainLinkIcon} from '#/components/icons/ChainLink'
import {CircleInfo_Stroke2_Corner0_Rounded as CircleInfo} from '#/components/icons/CircleInfo'
import {DotGrid_Stroke2_Corner0_Rounded as Ellipsis} from '#/components/icons/DotGrid'
import {Pencil_Stroke2_Corner0_Rounded as Pencil} from '#/components/icons/Pencil'
import {Trash_Stroke2_Corner0_Rounded as Trash} from '#/components/icons/Trash'
import * as Layout from '#/components/Layout'
import {ListMaybePlaceholder} from '#/components/Lists'
import {Loader} from '#/components/Loader'
import * as Menu from '#/components/Menu'
import {
  ReportDialog,
  useReportDialogControl,
} from '#/components/moderation/ReportDialog'
import * as Prompt from '#/components/Prompt'
import {RichText} from '#/components/RichText'
import {FeedsList} from '#/components/StarterPack/Main/FeedsList'
import {PostsList} from '#/components/StarterPack/Main/PostsList'
import {ProfilesList} from '#/components/StarterPack/Main/ProfilesList'
import {QrCodeDialog} from '#/components/StarterPack/QrCodeDialog'
import {ShareDialog} from '#/components/StarterPack/ShareDialog'
import {Text} from '#/components/Typography'
import * as bsky from '#/types/bsky'

type StarterPackScreeProps = NativeStackScreenProps<
  CommonNavigatorParams,
  'StarterPack'
>
type StarterPackScreenShortProps = NativeStackScreenProps<
  CommonNavigatorParams,
  'StarterPackShort'
>

export function StarterPackScreen({route}: StarterPackScreeProps) {
  return (
    <Layout.Screen>
      <StarterPackScreenInner routeParams={route.params} />
    </Layout.Screen>
  )
}

export function StarterPackScreenShort({route}: StarterPackScreenShortProps) {
  const {_} = useLingui()
  const {
    data: resolvedStarterPack,
    isLoading,
    isError,
  } = useResolvedStarterPackShortLink({
    code: route.params.code,
  })

  if (isLoading || isError || !resolvedStarterPack) {
    return (
      <Layout.Screen>
        <ListMaybePlaceholder
          isLoading={isLoading}
          isError={isError}
          errorMessage={_(msg`That starter pack could not be found.`)}
          emptyMessage={_(msg`That starter pack could not be found.`)}
        />
      </Layout.Screen>
    )
  }
  return (
    <Layout.Screen>
      <StarterPackScreenInner routeParams={resolvedStarterPack} />
    </Layout.Screen>
  )
}

export function StarterPackScreenInner({
  routeParams,
}: {
  routeParams: StarterPackScreeProps['route']['params']
}) {
  const {name, rkey} = routeParams
  const {_} = useLingui()
  const {currentAccount} = useSession()

  const moderationOpts = useModerationOpts()
  const {
    data: did,
    isLoading: isLoadingDid,
    isError: isErrorDid,
  } = useResolveDidQuery(name)
  const {
    data: starterPack,
    isLoading: isLoadingStarterPack,
    isError: isErrorStarterPack,
  } = useStarterPackQuery({did, rkey})

  const isValid =
    starterPack &&
    (starterPack.list || starterPack?.creator?.did === currentAccount?.did) &&
    AppBskyGraphDefs.validateStarterPackView(starterPack) &&
    AppBskyGraphStarterpack.validateRecord(starterPack.record)

  if (!did || !starterPack || !isValid || !moderationOpts) {
    return (
      <ListMaybePlaceholder
        isLoading={isLoadingDid || isLoadingStarterPack || !moderationOpts}
        isError={isErrorDid || isErrorStarterPack || !isValid}
        errorMessage={_(msg`That starter pack could not be found.`)}
        emptyMessage={_(msg`That starter pack could not be found.`)}
      />
    )
  }

  if (!starterPack.list && starterPack.creator.did === currentAccount?.did) {
    return <InvalidStarterPack rkey={rkey} />
  }

  return (
    <StarterPackScreenLoaded
      starterPack={starterPack}
      routeParams={routeParams}
      moderationOpts={moderationOpts}
    />
  )
}

function StarterPackScreenLoaded({
  starterPack,
  routeParams,
  moderationOpts,
}: {
  starterPack: AppBskyGraphDefs.StarterPackView
  routeParams: StarterPackScreeProps['route']['params']
  moderationOpts: ModerationOpts
}) {
  const showPeopleTab = Boolean(starterPack.list)
  const showFeedsTab = Boolean(starterPack.feeds?.length)
  const showPostsTab = Boolean(starterPack.list)
  const {_} = useLingui()

  const tabs = [
    ...(showPeopleTab ? [_(msg`People`)] : []),
    ...(showFeedsTab ? [_(msg`Feeds`)] : []),
    ...(showPostsTab ? [_(msg`Posts`)] : []),
  ]

  const qrCodeDialogControl = useDialogControl()
  const shareDialogControl = useDialogControl()

  const shortenLink = useShortenLink()
  const [link, setLink] = React.useState<string>()
  const [imageLoaded, setImageLoaded] = React.useState(false)

  React.useEffect(() => {
    logEvent('starterPack:opened', {
      starterPack: starterPack.uri,
    })
  }, [starterPack.uri])

  const onOpenShareDialog = React.useCallback(() => {
    const rkey = new AtUri(starterPack.uri).rkey
    shortenLink(makeStarterPackLink(starterPack.creator.did, rkey)).then(
      res => {
        setLink(res.url)
      },
    )
    Image.prefetch(getStarterPackOgCard(starterPack))
      .then(() => {
        setImageLoaded(true)
      })
      .catch(() => {
        setImageLoaded(true)
      })
    shareDialogControl.open()
  }, [shareDialogControl, shortenLink, starterPack])

  React.useEffect(() => {
    if (routeParams.new) {
      onOpenShareDialog()
    }
  }, [onOpenShareDialog, routeParams.new, shareDialogControl])

  return (
    <>
      <PagerWithHeader
        items={tabs}
        isHeaderReady={true}
        renderHeader={() => (
          <Header
            starterPack={starterPack}
            routeParams={routeParams}
            onOpenShareDialog={onOpenShareDialog}
          />
        )}>
        {showPeopleTab
          ? ({headerHeight, scrollElRef}) => (
              <ProfilesList
                // Validated above
                listUri={starterPack!.list!.uri}
                headerHeight={headerHeight}
                // @ts-expect-error
                scrollElRef={scrollElRef}
                moderationOpts={moderationOpts}
              />
            )
          : null}
        {showFeedsTab
          ? ({headerHeight, scrollElRef}) => (
              <FeedsList
                // @ts-expect-error ?
                feeds={starterPack?.feeds}
                headerHeight={headerHeight}
                // @ts-expect-error
                scrollElRef={scrollElRef}
              />
            )
          : null}
        {showPostsTab
          ? ({headerHeight, scrollElRef}) => (
              <PostsList
                // Validated above
                listUri={starterPack!.list!.uri}
                headerHeight={headerHeight}
                // @ts-expect-error
                scrollElRef={scrollElRef}
                moderationOpts={moderationOpts}
              />
            )
          : null}
      </PagerWithHeader>

      <QrCodeDialog
        control={qrCodeDialogControl}
        starterPack={starterPack}
        link={link}
      />
      <ShareDialog
        control={shareDialogControl}
        qrDialogControl={qrCodeDialogControl}
        starterPack={starterPack}
        link={link}
        imageLoaded={imageLoaded}
      />
    </>
  )
}

function Header({
  starterPack,
  routeParams,
  onOpenShareDialog,
}: {
  starterPack: AppBskyGraphDefs.StarterPackView
  routeParams: StarterPackScreeProps['route']['params']
  onOpenShareDialog: () => void
}) {
  const {_} = useLingui()
  const t = useTheme()
  const {currentAccount, hasSession} = useSession()
  const agent = useAgent()
  const queryClient = useQueryClient()
  const setActiveStarterPack = useSetActiveStarterPack()
  const {requestSwitchToAccount} = useLoggedOutViewControls()
  const {captureAction} = useProgressGuideControls()

  const [isProcessing, setIsProcessing] = React.useState(false)

  const {record, creator} = starterPack
  const isOwn = creator?.did === currentAccount?.did
  const joinedAllTimeCount = starterPack.joinedAllTimeCount ?? 0

  const navigation = useNavigation<NavigationProp>()

  React.useEffect(() => {
    const onFocus = () => {
      if (hasSession) return
      setActiveStarterPack({
        uri: starterPack.uri,
      })
    }
    const onBeforeRemove = () => {
      if (hasSession) return
      setActiveStarterPack(undefined)
    }

    navigation.addListener('focus', onFocus)
    navigation.addListener('beforeRemove', onBeforeRemove)

    return () => {
      navigation.removeListener('focus', onFocus)
      navigation.removeListener('beforeRemove', onBeforeRemove)
    }
  }, [hasSession, navigation, setActiveStarterPack, starterPack.uri])

  const onFollowAll = async () => {
    if (!starterPack.list) return

    setIsProcessing(true)

    let listItems: AppBskyGraphDefs.ListItemView[] = []
    try {
      listItems = await getAllListMembers(agent, starterPack.list.uri)
    } catch (e) {
      setIsProcessing(false)
      Toast.show(_(msg`An error occurred while trying to follow all`), 'xmark')
      logger.error('Failed to get list members for starter pack', {
        safeMessage: e,
      })
      return
    }

    const dids = listItems
      .filter(
        li =>
          li.subject.did !== currentAccount?.did &&
          !isBlockedOrBlocking(li.subject) &&
          !isMuted(li.subject) &&
          !li.subject.viewer?.following,
      )
      .map(li => li.subject.did)

    let followUris: Map<string, string>
    try {
      followUris = await bulkWriteFollows(agent, dids)
    } catch (e) {
      setIsProcessing(false)
      Toast.show(_(msg`An error occurred while trying to follow all`), 'xmark')
      logger.error('Failed to follow all accounts', {safeMessage: e})
    }

    setIsProcessing(false)
    batchedUpdates(() => {
      for (let did of dids) {
        updateProfileShadow(queryClient, did, {
          followingUri: followUris.get(did),
        })
      }
    })
    Toast.show(_(msg`All accounts have been followed!`))
    captureAction(ProgressGuideAction.Follow, dids.length)
    logEvent('starterPack:followAll', {
      logContext: 'StarterPackProfilesList',
      starterPack: starterPack.uri,
      count: dids.length,
    })
  }

  if (
    !bsky.dangerousIsType<AppBskyGraphStarterpack.Record>(
      record,
      AppBskyGraphStarterpack.isRecord,
    )
  ) {
    return null
  }

  const richText = record.description
    ? new RichTextAPI({
        text: record.description,
        facets: record.descriptionFacets,
      })
    : undefined

  return (
    <>
      <ProfileSubpageHeader
        isLoading={false}
        href={makeProfileLink(creator)}
        title={record.name}
        isOwner={isOwn}
        avatar={undefined}
        creator={creator}
        purpose="app.bsky.graph.defs#referencelist"
        avatarType="starter-pack">
        {hasSession ? (
          <View style={[a.flex_row, a.gap_sm, a.align_center]}>
            {isOwn ? (
              <Button
                label={_(msg`Share this starter pack`)}
                hitSlop={HITSLOP_20}
                variant="solid"
                color="primary"
                size="small"
                onPress={onOpenShareDialog}>
                <ButtonText>
                  <Trans>Share</Trans>
                </ButtonText>
              </Button>
            ) : (
              <Button
                label={_(msg`Follow all`)}
                variant="solid"
                color="primary"
                size="small"
                disabled={isProcessing}
                onPress={onFollowAll}
                style={[a.flex_row, a.gap_xs, a.align_center]}>
                <ButtonText>
                  <Trans>Follow all</Trans>
                </ButtonText>
                {isProcessing && <Loader size="xs" />}
              </Button>
            )}
            <OverflowMenu
              routeParams={routeParams}
              starterPack={starterPack}
              onOpenShareDialog={onOpenShareDialog}
            />
          </View>
        ) : null}
      </ProfileSubpageHeader>
      {!hasSession || richText || joinedAllTimeCount >= 25 ? (
        <View style={[a.px_lg, a.pt_md, a.pb_sm, a.gap_md]}>
          {richText ? (
            <RichText value={richText} style={[a.text_md, a.leading_snug]} />
          ) : null}
          {!hasSession ? (
            <Button
              label={_(msg`Join Bluesky`)}
              onPress={() => {
                setActiveStarterPack({
                  uri: starterPack.uri,
                })
                requestSwitchToAccount({requestedAccount: 'new'})
              }}
              variant="solid"
              color="primary"
              size="large">
              <ButtonText style={[a.text_lg]}>
                <Trans>Join Bluesky</Trans>
              </ButtonText>
            </Button>
          ) : null}
          {joinedAllTimeCount >= 25 ? (
            <View style={[a.flex_row, a.align_center, a.gap_sm]}>
              <FontAwesomeIcon
                icon="arrow-trend-up"
                size={12}
                color={t.atoms.text_contrast_medium.color}
              />
              <Text
                style={[a.font_bold, a.text_sm, t.atoms.text_contrast_medium]}>
                <Trans comment="Number of users (always at least 25) who have joined Bluesky using a specific starter pack">
                  <Plural
                    value={starterPack.joinedAllTimeCount || 0}
                    other="# people have"
                  />{' '}
                  used this starter pack!
                </Trans>
              </Text>
            </View>
          ) : null}
        </View>
      ) : null}
    </>
  )
}

function OverflowMenu({
  starterPack,
  routeParams,
  onOpenShareDialog,
}: {
  starterPack: AppBskyGraphDefs.StarterPackView
  routeParams: StarterPackScreeProps['route']['params']
  onOpenShareDialog: () => void
}) {
  const t = useTheme()
  const {_} = useLingui()
  const {gtMobile} = useBreakpoints()
  const {currentAccount} = useSession()
  const reportDialogControl = useReportDialogControl()
  const deleteDialogControl = useDialogControl()
  const navigation = useNavigation<NavigationProp>()

  const {
    mutate: deleteStarterPack,
    isPending: isDeletePending,
    error: deleteError,
  } = useDeleteStarterPackMutation({
    onSuccess: () => {
      logEvent('starterPack:delete', {})
      deleteDialogControl.close(() => {
        if (navigation.canGoBack()) {
          navigation.popToTop()
        } else {
          navigation.navigate('Home')
        }
      })
    },
    onError: e => {
      logger.error('Failed to delete starter pack', {safeMessage: e})
    },
  })

  const isOwn = starterPack.creator.did === currentAccount?.did

  const onDeleteStarterPack = async () => {
    if (!starterPack.list) {
      logger.error(`Unable to delete starterpack because list is missing`)
      return
    }

    deleteStarterPack({
      rkey: routeParams.rkey,
      listUri: starterPack.list.uri,
    })
    logEvent('starterPack:delete', {})
  }

  return (
    <>
      <Menu.Root>
        <Menu.Trigger label={_(msg`Repost or quote post`)}>
          {({props}) => (
            <Button
              {...props}
              testID="headerDropdownBtn"
              label={_(msg`Open starter pack menu`)}
              hitSlop={HITSLOP_20}
              variant="solid"
              color="secondary"
              size="small"
              shape="round">
              <ButtonIcon icon={Ellipsis} />
            </Button>
          )}
        </Menu.Trigger>
        <Menu.Outer style={{minWidth: 170}}>
          {isOwn ? (
            <>
              <Menu.Item
                label={_(msg`Edit starter pack`)}
                testID="editStarterPackLinkBtn"
                onPress={() => {
                  navigation.navigate('StarterPackEdit', {
                    rkey: routeParams.rkey,
                  })
                }}>
                <Menu.ItemText>
                  <Trans>Edit</Trans>
                </Menu.ItemText>
                <Menu.ItemIcon icon={Pencil} position="right" />
              </Menu.Item>
              <Menu.Item
                label={_(msg`Delete starter pack`)}
                testID="deleteStarterPackBtn"
                onPress={() => {
                  deleteDialogControl.open()
                }}>
                <Menu.ItemText>
                  <Trans>Delete</Trans>
                </Menu.ItemText>
                <Menu.ItemIcon icon={Trash} position="right" />
              </Menu.Item>
            </>
          ) : (
            <>
              <Menu.Group>
                <Menu.Item
                  label={
                    isWeb
                      ? _(msg`Copy link to starter pack`)
                      : _(msg`Share via...`)
                  }
                  testID="shareStarterPackLinkBtn"
                  onPress={onOpenShareDialog}>
                  <Menu.ItemText>
                    {isWeb ? (
                      <Trans>Copy link</Trans>
                    ) : (
                      <Trans>Share via...</Trans>
                    )}
                  </Menu.ItemText>
                  <Menu.ItemIcon
                    icon={isWeb ? ChainLinkIcon : ArrowOutOfBoxIcon}
                    position="right"
                  />
                </Menu.Item>
              </Menu.Group>

              <Menu.Item
                label={_(msg`Report starter pack`)}
                onPress={() => reportDialogControl.open()}>
                <Menu.ItemText>
                  <Trans>Report starter pack</Trans>
                </Menu.ItemText>
                <Menu.ItemIcon icon={CircleInfo} position="right" />
              </Menu.Item>
            </>
          )}
        </Menu.Outer>
      </Menu.Root>

      {starterPack.list && (
        <ReportDialog
          control={reportDialogControl}
          subject={{
            ...starterPack,
            $type: 'app.bsky.graph.defs#starterPackView',
          }}
        />
      )}

      <Prompt.Outer control={deleteDialogControl}>
        <Prompt.TitleText>
          <Trans>Delete starter pack?</Trans>
        </Prompt.TitleText>
        <Prompt.DescriptionText>
          <Trans>Are you sure you want to delete this starter pack?</Trans>
        </Prompt.DescriptionText>
        {deleteError && (
          <View
            style={[
              a.flex_row,
              a.gap_sm,
              a.rounded_sm,
              a.p_md,
              a.mb_lg,
              a.border,
              t.atoms.border_contrast_medium,
              t.atoms.bg_contrast_25,
            ]}>
            <View style={[a.flex_1, a.gap_2xs]}>
              <Text style={[a.font_bold]}>
                <Trans>Unable to delete</Trans>
              </Text>
              <Text style={[a.leading_snug]}>{cleanError(deleteError)}</Text>
            </View>
            <CircleInfo size="sm" fill={t.palette.negative_400} />
          </View>
        )}
        <Prompt.Actions>
          <Button
            variant="solid"
            color="negative"
            size={gtMobile ? 'small' : 'large'}
            label={_(msg`Yes, delete this starter pack`)}
            onPress={onDeleteStarterPack}>
            <ButtonText>
              <Trans>Delete</Trans>
            </ButtonText>
            {isDeletePending && <ButtonIcon icon={Loader} />}
          </Button>
          <Prompt.Cancel />
        </Prompt.Actions>
      </Prompt.Outer>
    </>
  )
}

function InvalidStarterPack({rkey}: {rkey: string}) {
  const {_} = useLingui()
  const t = useTheme()
  const navigation = useNavigation<NavigationProp>()
  const {gtMobile} = useBreakpoints()
  const [isProcessing, setIsProcessing] = React.useState(false)

  const goBack = () => {
    if (navigation.canGoBack()) {
      navigation.goBack()
    } else {
      navigation.replace('Home')
    }
  }

  const {mutate: deleteStarterPack} = useDeleteStarterPackMutation({
    onSuccess: () => {
      setIsProcessing(false)
      goBack()
    },
    onError: e => {
      setIsProcessing(false)
      logger.error('Failed to delete invalid starter pack', {safeMessage: e})
      Toast.show(_(msg`Failed to delete starter pack`), 'xmark')
    },
  })

  return (
    <Layout.Content centerContent>
      <View style={[a.py_4xl, a.px_xl, a.align_center, a.gap_5xl]}>
        <View style={[a.w_full, a.align_center, a.gap_lg]}>
          <Text style={[a.font_bold, a.text_3xl]}>
            <Trans>Starter pack is invalid</Trans>
          </Text>
          <Text
            style={[
              a.text_md,
              a.text_center,
              t.atoms.text_contrast_high,
              {lineHeight: 1.4},
              gtMobile ? {width: 450} : [a.w_full, a.px_lg],
            ]}>
            <Trans>
              The starter pack that you are trying to view is invalid. You may
              delete this starter pack instead.
            </Trans>
          </Text>
        </View>
        <View style={[a.gap_md, gtMobile ? {width: 350} : [a.w_full, a.px_lg]]}>
          <Button
            variant="solid"
            color="primary"
            label={_(msg`Delete starter pack`)}
            size="large"
            style={[a.rounded_sm, a.overflow_hidden, {paddingVertical: 10}]}
            disabled={isProcessing}
            onPress={() => {
              setIsProcessing(true)
              deleteStarterPack({rkey})
            }}>
            <ButtonText>
              <Trans>Delete</Trans>
            </ButtonText>
            {isProcessing && <Loader size="xs" color="white" />}
          </Button>
          <Button
            variant="solid"
            color="secondary"
            label={_(msg`Return to previous page`)}
            size="large"
            style={[a.rounded_sm, a.overflow_hidden, {paddingVertical: 10}]}
            disabled={isProcessing}
            onPress={goBack}>
            <ButtonText>
              <Trans>Go Back</Trans>
            </ButtonText>
          </Button>
        </View>
      </View>
    </Layout.Content>
  )
}