import React, {useState, useRef} from 'react'
import {
  ActivityIndicator,
  Keyboard,
  TextInput,
  TouchableOpacity,
  View,
} from 'react-native'
import {ComAtprotoServerDescribeServer} from '@atproto/api'
import {Trans, msg} from '@lingui/macro'
import {useLingui} from '@lingui/react'

import {useAnalytics} from 'lib/analytics/analytics'
import {createFullHandle} from 'lib/strings/handles'
import {isNetworkError} from 'lib/strings/errors'
import {useSessionApi} from '#/state/session'
import {cleanError} from 'lib/strings/errors'
import {logger} from '#/logger'
import {Button, ButtonText} from '#/components/Button'
import {atoms as a, useTheme} from '#/alf'
import {Text} from '#/components/Typography'
import * as TextField from '#/components/forms/TextField'
import {At_Stroke2_Corner0_Rounded as At} from '#/components/icons/At'
import {Lock_Stroke2_Corner0_Rounded as Lock} from '#/components/icons/Lock'
import {HostingProvider} from '#/components/forms/HostingProvider'
import {FormContainer} from './FormContainer'
import {FormError} from '#/components/forms/FormError'

type ServiceDescription = ComAtprotoServerDescribeServer.OutputSchema

export const LoginForm = ({
  error,
  serviceUrl,
  serviceDescription,
  initialHandle,
  setError,
  setServiceUrl,
  onPressRetryConnect,
  onPressBack,
  onPressForgotPassword,
}: {
  error: string
  serviceUrl: string
  serviceDescription: ServiceDescription | undefined
  initialHandle: string
  setError: (v: string) => void
  setServiceUrl: (v: string) => void
  onPressRetryConnect: () => void
  onPressBack: () => void
  onPressForgotPassword: () => void
}) => {
  const {track} = useAnalytics()
  const t = useTheme()
  const [isProcessing, setIsProcessing] = useState<boolean>(false)
  const [identifier, setIdentifier] = useState<string>(initialHandle)
  const [password, setPassword] = useState<string>('')
  const passwordInputRef = useRef<TextInput>(null)
  const {_} = useLingui()
  const {login} = useSessionApi()

  const onPressSelectService = React.useCallback(() => {
    Keyboard.dismiss()
    track('Signin:PressedSelectService')
  }, [track])

  const onPressNext = async () => {
    Keyboard.dismiss()
    setError('')
    setIsProcessing(true)

    try {
      // try to guess the handle if the user just gave their own username
      let fullIdent = identifier
      if (
        !identifier.includes('@') && // not an email
        !identifier.includes('.') && // not a domain
        serviceDescription &&
        serviceDescription.availableUserDomains.length > 0
      ) {
        let matched = false
        for (const domain of serviceDescription.availableUserDomains) {
          if (fullIdent.endsWith(domain)) {
            matched = true
          }
        }
        if (!matched) {
          fullIdent = createFullHandle(
            identifier,
            serviceDescription.availableUserDomains[0],
          )
        }
      }

      // TODO remove double login
      await login({
        service: serviceUrl,
        identifier: fullIdent,
        password,
      })
    } catch (e: any) {
      const errMsg = e.toString()
      setIsProcessing(false)
      if (errMsg.includes('Authentication Required')) {
        logger.debug('Failed to login due to invalid credentials', {
          error: errMsg,
        })
        setError(_(msg`Invalid username or password`))
      } else if (isNetworkError(e)) {
        logger.warn('Failed to login due to network error', {error: errMsg})
        setError(
          _(
            msg`Unable to contact your service. Please check your Internet connection.`,
          ),
        )
      } else {
        logger.warn('Failed to login', {error: errMsg})
        setError(cleanError(errMsg))
      }
    }
  }

  const isReady = !!serviceDescription && !!identifier && !!password
  return (
    <FormContainer testID="loginForm" title={<Trans>Sign in</Trans>}>
      <View>
        <TextField.Label>
          <Trans>Hosting provider</Trans>
        </TextField.Label>
        <HostingProvider
          serviceUrl={serviceUrl}
          onSelectServiceUrl={setServiceUrl}
          onOpenDialog={onPressSelectService}
        />
      </View>
      <View>
        <TextField.Label>
          <Trans>Account</Trans>
        </TextField.Label>
        <TextField.Root>
          <TextField.Icon icon={At} />
          <TextField.Input
            testID="loginUsernameInput"
            label={_(msg`Username or email address`)}
            autoCapitalize="none"
            autoFocus
            autoCorrect={false}
            autoComplete="username"
            returnKeyType="next"
            textContentType="username"
            onSubmitEditing={() => {
              passwordInputRef.current?.focus()
            }}
            blurOnSubmit={false} // prevents flickering due to onSubmitEditing going to next field
            value={identifier}
            onChangeText={str =>
              setIdentifier((str || '').toLowerCase().trim())
            }
            editable={!isProcessing}
            accessibilityHint={_(
              msg`Input the username or email address you used at signup`,
            )}
          />
        </TextField.Root>
      </View>
      <View>
        <TextField.Root>
          <TextField.Icon icon={Lock} />
          <TextField.Input
            testID="loginPasswordInput"
            inputRef={passwordInputRef}
            label={_(msg`Password`)}
            autoCapitalize="none"
            autoCorrect={false}
            autoComplete="password"
            returnKeyType="done"
            enablesReturnKeyAutomatically={true}
            secureTextEntry={true}
            textContentType="password"
            clearButtonMode="while-editing"
            value={password}
            onChangeText={setPassword}
            onSubmitEditing={onPressNext}
            blurOnSubmit={false} // HACK: https://github.com/facebook/react-native/issues/21911#issuecomment-558343069 Keyboard blur behavior is now handled in onSubmitEditing
            editable={!isProcessing}
            accessibilityHint={
              identifier === ''
                ? _(msg`Input your password`)
                : _(msg`Input the password tied to ${identifier}`)
            }
          />
          <TouchableOpacity
            testID="forgotPasswordButton"
            onPress={onPressForgotPassword}
            accessibilityRole="button"
            accessibilityLabel={_(msg`Forgot password`)}
            accessibilityHint={_(msg`Opens password reset form`)}
            style={[
              a.rounded_sm,
              t.atoms.bg_contrast_100,
              {marginLeft: 'auto', left: 6, padding: 6},
              a.z_10,
            ]}>
            <ButtonText style={t.atoms.text_contrast_medium}>
              <Trans>Forgot?</Trans>
            </ButtonText>
          </TouchableOpacity>
        </TextField.Root>
      </View>
      <FormError error={error} />
      <View style={[a.flex_row, a.align_center]}>
        <Button
          label={_(msg`Back`)}
          variant="solid"
          color="secondary"
          size="small"
          onPress={onPressBack}>
          <ButtonText>
            <Trans>Back</Trans>
          </ButtonText>
        </Button>
        <View style={a.flex_1} />
        {!serviceDescription && error ? (
          <Button
            testID="loginRetryButton"
            label={_(msg`Retry`)}
            accessibilityHint={_(msg`Retries login`)}
            variant="solid"
            color="secondary"
            size="small"
            onPress={onPressRetryConnect}>
            {_(msg`Retry`)}
          </Button>
        ) : !serviceDescription ? (
          <>
            <ActivityIndicator />
            <Text style={[t.atoms.text_contrast_high, a.pl_md]}>
              <Trans>Connecting...</Trans>
            </Text>
          </>
        ) : isProcessing ? (
          <ActivityIndicator />
        ) : isReady ? (
          <Button
            label={_(msg`Next`)}
            accessibilityHint={_(msg`Navigates to the next screen`)}
            variant="solid"
            color="primary"
            size="small"
            onPress={onPressNext}>
            <ButtonText>
              <Trans>Next</Trans>
            </ButtonText>
          </Button>
        ) : undefined}
      </View>
    </FormContainer>
  )
}