import React, { useState, useCallback } from 'react'
import PropTypes from 'prop-types'
import { Field, Form } from 'react-final-form'
import { useDispatch } from 'react-redux'
import Button from '@material-ui/core/Button'
import Card from '@material-ui/core/Card'
import CardActions from '@material-ui/core/CardActions'
import CircularProgress from '@material-ui/core/CircularProgress'
import TextField from '@material-ui/core/TextField'
import { createMuiTheme, makeStyles } from '@material-ui/core/styles'
import { ThemeProvider } from '@material-ui/styles'
import Logo from '../icons/android-icon-72x72.png'
import { useLogin, useNotify, useTranslate } from 'react-admin'

import Notification from './Notification'
import LightTheme from '../themes/light'
import config from '../config'
import { clearQueue } from '../actions'

const useStyles = makeStyles((theme) => ({
  main: {
    display: 'flex',
    flexDirection: 'column',
    minHeight: '100vh',
    alignItems: 'center',
    justifyContent: 'flex-start',
    background: `url(${config.loginBackgroundURL})`,
    backgroundRepeat: 'no-repeat',
    backgroundSize: 'cover',
    backgroundPosition: 'center',
  },
  card: {
    minWidth: 300,
    marginTop: '6em',
  },
  avatar: {
    margin: '1em',
    display: 'flex',
    justifyContent: 'center',
  },
  icon: {
    backgroundColor: 'white',
    width: '40px',
  },
  systemName: {
    marginTop: '1em',
    display: 'flex',
    justifyContent: 'center',
    color: '#3f51b5', //theme.palette.grey[500]
  },
  welcome: {
    marginTop: '1em',
    padding: '0 1em 1em 1em',
    display: 'flex',
    justifyContent: 'center',
    color: '#3f51b5', //theme.palette.grey[500]
  },
  form: {
    padding: '0 1em 1em 1em',
  },
  input: {
    marginTop: '1em',
  },
  actions: {
    padding: '0 1em 1em 1em',
  },
}))

const renderInput = ({
  meta: { touched, error } = {},
  input: { ...inputProps },
  ...props
}) => (
  <TextField
    error={!!(touched && error)}
    helperText={touched && error}
    {...inputProps}
    {...props}
    fullWidth
  />
)

const FormLogin = ({ loading, handleSubmit, validate }) => {
  const translate = useTranslate()
  const classes = useStyles()

  return (
    <Form
      onSubmit={handleSubmit}
      validate={validate}
      render={({ handleSubmit }) => (
        <form onSubmit={handleSubmit} noValidate>
          <div className={classes.main}>
            <Card className={classes.card}>
              <div className={classes.avatar}>
                <img src={Logo} className={classes.icon} alt={'logo'} />
              </div>
              <div className={classes.systemName}>
                <a
                  href="https://www.navidrome.org"
                  target="_blank"
                  rel="noopener noreferrer"
                >
                  Navidrome
                </a>
              </div>
              {config.welcomeMessage && (
                <div
                  className={classes.welcome}
                  dangerouslySetInnerHTML={{ __html: config.welcomeMessage }}
                />
              )}
              <div className={classes.form}>
                <div className={classes.input}>
                  <Field
                    autoFocus
                    name="username"
                    component={renderInput}
                    label={translate('ra.auth.username')}
                    disabled={loading}
                  />
                </div>
                <div className={classes.input}>
                  <Field
                    name="password"
                    component={renderInput}
                    label={translate('ra.auth.password')}
                    type="password"
                    disabled={loading}
                  />
                </div>
              </div>
              <CardActions className={classes.actions}>
                <Button
                  variant="contained"
                  type="submit"
                  color="primary"
                  disabled={loading}
                  className={classes.button}
                  fullWidth
                >
                  {loading && <CircularProgress size={25} thickness={2} />}
                  {translate('ra.auth.sign_in')}
                </Button>
              </CardActions>
            </Card>
            <Notification />
          </div>
        </form>
      )}
    />
  )
}

const FormSignUp = ({ loading, handleSubmit, validate }) => {
  const translate = useTranslate()
  const classes = useStyles()

  return (
    <Form
      onSubmit={handleSubmit}
      validate={validate}
      render={({ handleSubmit }) => (
        <form onSubmit={handleSubmit} noValidate>
          <div className={classes.main}>
            <Card className={classes.card}>
              <div className={classes.avatar}>
                <img src={Logo} className={classes.icon} alt={'logo'} />
              </div>
              <div className={classes.welcome}>
                {translate('ra.auth.welcome1')}
              </div>
              <div className={classes.welcome}>
                {translate('ra.auth.welcome2')}
              </div>
              <div className={classes.form}>
                <div className={classes.input}>
                  <Field
                    autoFocus
                    name="username"
                    component={renderInput}
                    label={translate('ra.auth.username')}
                    disabled={loading}
                  />
                </div>
                <div className={classes.input}>
                  <Field
                    name="password"
                    component={renderInput}
                    label={translate('ra.auth.password')}
                    type="password"
                    disabled={loading}
                  />
                </div>
                <div className={classes.input}>
                  <Field
                    name="confirmPassword"
                    component={renderInput}
                    label={translate('ra.auth.confirmPassword')}
                    type="password"
                    disabled={loading}
                  />
                </div>
              </div>
              <CardActions className={classes.actions}>
                <Button
                  variant="contained"
                  type="submit"
                  color="primary"
                  disabled={loading}
                  className={classes.button}
                  fullWidth
                >
                  {loading && <CircularProgress size={25} thickness={2} />}
                  {translate('ra.auth.buttonCreateAdmin')}
                </Button>
              </CardActions>
            </Card>
            <Notification />
          </div>
        </form>
      )}
    />
  )
}
const Login = ({ location }) => {
  const [loading, setLoading] = useState(false)
  const translate = useTranslate()
  const notify = useNotify()
  const login = useLogin()
  const dispatch = useDispatch()

  const handleSubmit = useCallback(
    (auth) => {
      setLoading(true)
      dispatch(clearQueue())
      login(auth, location.state ? location.state.nextPathname : '/').catch(
        (error) => {
          setLoading(false)
          notify(
            typeof error === 'string'
              ? error
              : typeof error === 'undefined' || !error.message
              ? 'ra.auth.sign_in_error'
              : error.message,
            'warning'
          )
        }
      )
    },
    [dispatch, login, notify, setLoading, location]
  )

  const validateLogin = useCallback(
    (values) => {
      const errors = {}
      if (!values.username) {
        errors.username = translate('ra.validation.required')
      }
      if (!values.password) {
        errors.password = translate('ra.validation.required')
      }
      return errors
    },
    [translate]
  )

  const validateSignup = useCallback(
    (values) => {
      const errors = validateLogin(values)
      const regex = /^\w+$/g
      if (values.username && !values.username.match(regex)) {
        errors.username = translate('ra.validation.invalidChars')
      }
      if (!values.confirmPassword) {
        errors.confirmPassword = translate('ra.validation.required')
      }
      if (values.confirmPassword !== values.password) {
        errors.confirmPassword = translate('ra.validation.passwordDoesNotMatch')
      }
      return errors
    },
    [translate, validateLogin]
  )

  if (config.firstTime) {
    return (
      <FormSignUp
        handleSubmit={handleSubmit}
        validate={validateSignup}
        loading={loading}
      />
    )
  }
  return (
    <FormLogin
      handleSubmit={handleSubmit}
      validate={validateLogin}
      loading={loading}
    />
  )
}

Login.propTypes = {
  authProvider: PropTypes.func,
  previousRoute: PropTypes.string,
}

// We need to put the ThemeProvider decoration in another component
// Because otherwise the useStyles() hook used in Login won't get
// the right theme
const LoginWithTheme = (props) => (
  <ThemeProvider theme={createMuiTheme(LightTheme)}>
    <Login {...props} />
  </ThemeProvider>
)

export default LoginWithTheme