import {useState} from 'react'
import {View} from 'react-native'
import {XRPCError} from '@atproto/xrpc'
import {msg, Trans} from '@lingui/macro'
import {useLingui} from '@lingui/react'
import {validate as validateEmail} from 'email-validator'

import {useCleanError} from '#/lib/hooks/useCleanError'
import {
  SupportCode,
  useCreateSupportLink,
} from '#/lib/hooks/useCreateSupportLink'
import {useGetTimeAgo} from '#/lib/hooks/useTimeAgo'
import {useTLDs} from '#/lib/hooks/useTLDs'
import {isEmailMaybeInvalid} from '#/lib/strings/email'
import {type AppLanguage} from '#/locale/languages'
import {useLanguagePrefs} from '#/state/preferences'
import {useSession} from '#/state/session'
import {atoms as a, web} from '#/alf'
import {Admonition} from '#/components/Admonition'
import {AgeAssuranceBadge} from '#/components/ageAssurance/AgeAssuranceBadge'
import {urls} from '#/components/ageAssurance/const'
import {KWS_SUPPORTED_LANGS} from '#/components/ageAssurance/const'
import {Button, ButtonIcon, ButtonText} from '#/components/Button'
import * as Dialog from '#/components/Dialog'
import {Divider} from '#/components/Divider'
import * as TextField from '#/components/forms/TextField'
import {ShieldCheck_Stroke2_Corner0_Rounded as Shield} from '#/components/icons/Shield'
import {LanguageSelect} from '#/components/LanguageSelect'
import {SimpleInlineLinkText} from '#/components/Link'
import {Loader} from '#/components/Loader'
import {Text} from '#/components/Typography'
import {logger} from '#/ageAssurance'
import {useAgeAssurance} from '#/ageAssurance'
import {useBeginAgeAssurance} from '#/ageAssurance/useBeginAgeAssurance'

export {useDialogControl} from '#/components/Dialog/context'

export function AgeAssuranceInitDialog({
  control,
}: {
  control: Dialog.DialogControlProps
}) {
  const {_} = useLingui()
  return (
    <Dialog.Outer control={control}>
      <Dialog.Handle />

      <Dialog.ScrollableInner
        label={_(
          msg`Begin the age assurance process by completing the fields below.`,
        )}
        style={[
          web({
            maxWidth: 400,
          }),
        ]}>
        <Inner />
        <Dialog.Close />
      </Dialog.ScrollableInner>
    </Dialog.Outer>
  )
}

function Inner() {
  const {_} = useLingui()
  const {currentAccount} = useSession()
  const langPrefs = useLanguagePrefs()
  const cleanError = useCleanError()
  const {close} = Dialog.useDialogContext()
  const aa = useAgeAssurance()
  const lastInitiatedAt = aa.state.lastInitiatedAt
  const getTimeAgo = useGetTimeAgo()
  const tlds = useTLDs()
  const createSupportLink = useCreateSupportLink()

  const wasRecentlyInitiated =
    lastInitiatedAt &&
    new Date(lastInitiatedAt).getTime() > Date.now() - 5 * 60 * 1000 // 5 minutes

  const [success, setSuccess] = useState(false)
  const [email, setEmail] = useState(currentAccount?.email || '')
  const [emailError, setEmailError] = useState<string>('')
  const [languageError, setLanguageError] = useState(false)
  const [disabled, setDisabled] = useState(false)
  const [language, setLanguage] = useState<string | undefined>(
    convertToKWSSupportedLanguage(langPrefs.appLanguage),
  )
  const [error, setError] = useState<React.ReactNode>(null)

  const {mutateAsync: begin, isPending} = useBeginAgeAssurance()

  const runEmailValidation = () => {
    if (validateEmail(email)) {
      setEmailError('')
      setDisabled(false)

      if (tlds && isEmailMaybeInvalid(email, tlds)) {
        setEmailError(
          _(
            msg`Please double-check that you have entered your email address correctly.`,
          ),
        )
        return {status: 'maybe'}
      }

      return {status: 'valid'}
    }

    setEmailError(_(msg`Please enter a valid email address.`))
    setDisabled(true)

    return {status: 'invalid'}
  }

  const onSubmit = async () => {
    setLanguageError(false)

    logger.metric('ageAssurance:initDialogSubmit', {})

    try {
      const {status} = runEmailValidation()

      if (status === 'invalid') return
      if (!language) {
        setLanguageError(true)
        return
      }

      await begin({
        email,
        language,
      })

      setSuccess(true)
    } catch (e) {
      let errorMessage: React.ReactNode = _(
        msg`Something went wrong, please try again`,
      )

      if (e instanceof XRPCError) {
        if (e.error === 'InvalidEmail') {
          errorMessage = _(
            msg`Please enter a valid, non-temporary email address. You may need to access this email in the future.`,
          )
          logger.metric('ageAssurance:initDialogError', {code: 'InvalidEmail'})
        } else if (e.error === 'DidTooLong') {
          errorMessage = (
            <>
              <Trans>
                We're having issues initializing the age assurance process for
                your account. Please{' '}
                <SimpleInlineLinkText
                  to={createSupportLink({code: SupportCode.AA_DID, email})}
                  label={_(msg`Contact support`)}>
                  contact support
                </SimpleInlineLinkText>{' '}
                for assistance.
              </Trans>
            </>
          )
          logger.metric('ageAssurance:initDialogError', {code: 'DidTooLong'})
        } else {
          logger.metric('ageAssurance:initDialogError', {code: 'other'})
        }
      } else {
        const {clean, raw} = cleanError(e)
        errorMessage = clean || raw || errorMessage
        logger.metric('ageAssurance:initDialogError', {code: 'other'})
      }

      setError(errorMessage)
    }
  }

  return (
    <View>
      <View style={[a.align_start]}>
        <AgeAssuranceBadge />

        <Text style={[a.text_xl, a.font_bold, a.pt_xl, a.pb_md]}>
          {success ? <Trans>Success!</Trans> : <Trans>Verify your age</Trans>}
        </Text>

        <View style={[a.pb_xl, a.gap_sm]}>
          {success ? (
            <Text style={[a.text_sm, a.leading_snug]}>
              <Trans>
                Please check your email inbox for further instructions. It may
                take a minute or two to arrive.
              </Trans>
            </Text>
          ) : (
            <>
              <Text style={[a.text_sm, a.leading_snug]}>
                <Trans>
                  We have partnered with{' '}
                  <SimpleInlineLinkText
                    label={_(msg`KWS website`)}
                    to={urls.kwsHome}
                    style={[a.text_sm, a.leading_snug]}>
                    KWS
                  </SimpleInlineLinkText>{' '}
                  to handle age verification. When you click "Begin" below, KWS
                  will email you instructions to complete the verification
                  process. If your email address has already been used to verify
                  your age for another game or service that uses KWS, you won’t
                  need to do it again. When you’re done, you'll be brought back
                  to continue using Bluesky.
                </Trans>
              </Text>
              <Text style={[a.text_sm, a.leading_snug]}>
                <Trans>This should only take a few minutes.</Trans>
              </Text>
            </>
          )}
        </View>

        {success ? (
          <View style={[a.w_full]}>
            <Button
              label={_(msg`Close dialog`)}
              size="large"
              variant="solid"
              color="secondary"
              onPress={() => close()}>
              <ButtonText>
                <Trans>Close dialog</Trans>
              </ButtonText>
            </Button>
          </View>
        ) : (
          <>
            <Divider />

            <View style={[a.w_full, a.pt_xl, a.gap_lg, a.pb_lg]}>
              {wasRecentlyInitiated && (
                <Admonition type="warning">
                  <Trans>
                    You initiated this flow already,{' '}
                    {getTimeAgo(lastInitiatedAt, new Date(), {format: 'long'})}{' '}
                    ago. It may take up to 5 minutes for emails to reach your
                    inbox. Please consider waiting a few minutes before trying
                    again.
                  </Trans>
                </Admonition>
              )}

              <View>
                <TextField.LabelText>
                  <Trans>Your email</Trans>
                </TextField.LabelText>
                <TextField.Root isInvalid={!!emailError}>
                  <TextField.Input
                    label={_(msg`Your email`)}
                    placeholder={_(msg`Your email`)}
                    value={email}
                    onChangeText={setEmail}
                    onFocus={() => setEmailError('')}
                    onBlur={() => {
                      runEmailValidation()
                    }}
                    returnKeyType="done"
                    autoCapitalize="none"
                    autoComplete="off"
                    autoCorrect={false}
                    onSubmitEditing={onSubmit}
                  />
                </TextField.Root>

                {emailError ? (
                  <Admonition type="error" style={[a.mt_sm]}>
                    {emailError}
                  </Admonition>
                ) : (
                  <Admonition type="tip" style={[a.mt_sm]}>
                    <Trans>
                      Use your account email address, or another real email
                      address you control, in case KWS or Bluesky needs to
                      contact you.
                    </Trans>
                  </Admonition>
                )}
              </View>

              <View>
                <TextField.LabelText>
                  <Trans>Your preferred language</Trans>
                </TextField.LabelText>
                <LanguageSelect
                  label={_(msg`Preferred language`)}
                  value={language}
                  onChange={value => {
                    setLanguage(value)
                    setLanguageError(false)
                  }}
                  items={KWS_SUPPORTED_LANGS}
                />

                {languageError && (
                  <Admonition type="error" style={[a.mt_sm]}>
                    <Trans>Please select a language</Trans>
                  </Admonition>
                )}
              </View>

              {error && <Admonition type="error">{error}</Admonition>}

              <Button
                disabled={disabled}
                label={_(msg`Begin age assurance process`)}
                size="large"
                variant="solid"
                color="primary"
                onPress={onSubmit}>
                <ButtonText>
                  <Trans>Begin</Trans>
                </ButtonText>
                <ButtonIcon
                  icon={isPending ? Loader : Shield}
                  position="right"
                />
              </Button>
            </View>
          </>
        )}
      </View>
    </View>
  )
}

// best-effort mapping of our languages to KWS supported languages
function convertToKWSSupportedLanguage(
  appLanguage: string,
): string | undefined {
  // `${Enum}` is how you get a type of string union of the enum values (???) -sfn
  switch (appLanguage as `${AppLanguage}`) {
    // only en is supported
    case 'en-GB':
      return 'en'
    // pt-PT is pt (pt-BR is supported independently)
    case 'pt-PT':
      return 'pt'
    // only chinese (simplified) is supported, map all chinese variants
    case 'zh-Hans-CN':
    case 'zh-Hant-HK':
    case 'zh-Hant-TW':
      return 'zh-Hans'
    default:
      // try and map directly - if undefined, they will have to pick from the dropdown
      return KWS_SUPPORTED_LANGS.find(v => v.value === appLanguage)?.value
  }
}