'use client'

import { useState } from 'react'
import {
  Dialog,
  DialogContent,
  DialogTitle,
  TextField,
  Button,
  Box,
  Typography,
  Alert,
  IconButton,
  Tabs,
  Tab,
  InputAdornment,
  CircularProgress
} from '@mui/material'
import { Close, Visibility, VisibilityOff } from '@mui/icons-material'
import { useTranslations } from 'next-intl'
import { useAuth } from '@/hooks/use-auth'

interface AuthModalProps {
  open: boolean
  onClose: () => void
  onSuccess?: () => void
  defaultTab?: 'login' | 'register'
  title?: string
  message?: string
}

export function AuthModal({
  open,
  onClose,
  onSuccess,
  defaultTab = 'login',
  title,
  message
}: AuthModalProps) {
  const t = useTranslations('auth')
  const { login, register } = useAuth()

  const [tab, setTab] = useState<'login' | 'register'>(defaultTab)
  const [showPassword, setShowPassword] = useState(false)
  const [loading, setLoading] = useState(false)
  const [error, setError] = useState<string | null>(null)

  // Login form state
  const [loginData, setLoginData] = useState({
    email: '',
    password: ''
  })

  // Register form state
  const [registerData, setRegisterData] = useState({
    name: '',
    email: '',
    password: '',
    confirmPassword: ''
  })

  const handleTabChange = (event: React.SyntheticEvent, newValue: 'login' | 'register') => {
    setTab(newValue)
    setError(null)
  }

  const handleLoginSubmit = async (e: React.FormEvent) => {
    e.preventDefault()
    setError(null)
    setLoading(true)

    try {
      const success = await login(loginData.email, loginData.password)
      if (success) {
        // Clear form
        setLoginData({ email: '', password: '' })
        // Call success callback
        onSuccess?.()
        // Close modal
        onClose()
      } else {
        setError(t('loginError'))
      }
    } catch (err: any) {
      setError(err.message || t('connectionError'))
    } finally {
      setLoading(false)
    }
  }

  const handleRegisterSubmit = async (e: React.FormEvent) => {
    e.preventDefault()
    setError(null)

    // Validate passwords match
    if (registerData.password !== registerData.confirmPassword) {
      setError(t('passwordMismatch'))
      return
    }

    setLoading(true)

    try {
      const success = await register(
        registerData.email,
        registerData.password,
        registerData.name || undefined
      )

      if (success) {
        // Clear form
        setRegisterData({ name: '', email: '', password: '', confirmPassword: '' })
        // Call success callback
        onSuccess?.()
        // Close modal
        onClose()
      } else {
        setError(t('registerError'))
      }
    } catch (err: any) {
      setError(err.message || t('connectionError'))
    } finally {
      setLoading(false)
    }
  }

  const handleClose = () => {
    if (!loading) {
      setError(null)
      onClose()
    }
  }

  return (
    <Dialog
      open={open}
      onClose={handleClose}
      maxWidth="sm"
      fullWidth
      PaperProps={{
        sx: {
          borderRadius: 2
        }
      }}
    >
      <DialogTitle sx={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between', pb: 1 }}>
        <Typography variant="h6">
          {title || (tab === 'login' ? t('welcomeBack') : t('joinUs'))}
        </Typography>
        <IconButton
          onClick={handleClose}
          disabled={loading}
          size="small"
          sx={{ color: 'text.secondary' }}
        >
          <Close />
        </IconButton>
      </DialogTitle>

      <DialogContent>
        {message && (
          <Alert severity="info" sx={{ mb: 3 }}>
            {message}
          </Alert>
        )}

        <Tabs
          value={tab}
          onChange={handleTabChange}
          variant="fullWidth"
          sx={{ mb: 3, borderBottom: 1, borderColor: 'divider' }}
        >
          <Tab label={t('login')} value="login" />
          <Tab label={t('register')} value="register" />
        </Tabs>

        {error && (
          <Alert severity="error" sx={{ mb: 2 }}>
            {error}
          </Alert>
        )}

        {tab === 'login' ? (
          <Box component="form" onSubmit={handleLoginSubmit}>
            <TextField
              fullWidth
              label={t('email')}
              type="email"
              value={loginData.email}
              onChange={(e) => setLoginData(prev => ({ ...prev, email: e.target.value }))}
              required
              disabled={loading}
              sx={{ mb: 2 }}
              autoComplete="email"
            />
            <TextField
              fullWidth
              label={t('password')}
              type={showPassword ? 'text' : 'password'}
              value={loginData.password}
              onChange={(e) => setLoginData(prev => ({ ...prev, password: e.target.value }))}
              required
              disabled={loading}
              sx={{ mb: 3 }}
              autoComplete="current-password"
              InputProps={{
                endAdornment: (
                  <InputAdornment position="end">
                    <IconButton
                      onClick={() => setShowPassword(!showPassword)}
                      edge="end"
                      disabled={loading}
                    >
                      {showPassword ? <VisibilityOff /> : <Visibility />}
                    </IconButton>
                  </InputAdornment>
                )
              }}
            />
            <Button
              type="submit"
              variant="contained"
              fullWidth
              size="large"
              disabled={loading}
              sx={{ mb: 2 }}
            >
              {loading ? <CircularProgress size={24} /> : t('login')}
            </Button>
            <Box sx={{ textAlign: 'center' }}>
              <Typography variant="body2" color="text.secondary">
                {t('noAccount')}{' '}
                <Button
                  onClick={() => setTab('register')}
                  disabled={loading}
                  sx={{ textTransform: 'none', p: 0, minWidth: 'auto' }}
                >
                  {t('createAccount')}
                </Button>
              </Typography>
            </Box>
          </Box>
        ) : (
          <Box component="form" onSubmit={handleRegisterSubmit}>
            <TextField
              fullWidth
              label={`${t('name')} ${t('optional')}`}
              type="text"
              value={registerData.name}
              onChange={(e) => setRegisterData(prev => ({ ...prev, name: e.target.value }))}
              disabled={loading}
              sx={{ mb: 2 }}
              autoComplete="name"
            />
            <TextField
              fullWidth
              label={t('email')}
              type="email"
              value={registerData.email}
              onChange={(e) => setRegisterData(prev => ({ ...prev, email: e.target.value }))}
              required
              disabled={loading}
              sx={{ mb: 2 }}
              autoComplete="email"
            />
            <TextField
              fullWidth
              label={t('password')}
              type={showPassword ? 'text' : 'password'}
              value={registerData.password}
              onChange={(e) => setRegisterData(prev => ({ ...prev, password: e.target.value }))}
              required
              disabled={loading}
              sx={{ mb: 2 }}
              autoComplete="new-password"
              InputProps={{
                endAdornment: (
                  <InputAdornment position="end">
                    <IconButton
                      onClick={() => setShowPassword(!showPassword)}
                      edge="end"
                      disabled={loading}
                    >
                      {showPassword ? <VisibilityOff /> : <Visibility />}
                    </IconButton>
                  </InputAdornment>
                )
              }}
            />
            <TextField
              fullWidth
              label={t('confirmPassword')}
              type={showPassword ? 'text' : 'password'}
              value={registerData.confirmPassword}
              onChange={(e) => setRegisterData(prev => ({ ...prev, confirmPassword: e.target.value }))}
              required
              disabled={loading}
              sx={{ mb: 3 }}
              autoComplete="new-password"
              error={registerData.confirmPassword !== '' && registerData.password !== registerData.confirmPassword}
              helperText={
                registerData.confirmPassword !== '' && registerData.password !== registerData.confirmPassword
                  ? t('passwordMismatch')
                  : ''
              }
            />
            <Button
              type="submit"
              variant="contained"
              fullWidth
              size="large"
              disabled={loading}
              sx={{ mb: 2 }}
            >
              {loading ? <CircularProgress size={24} /> : t('register')}
            </Button>
            <Box sx={{ textAlign: 'center' }}>
              <Typography variant="body2" color="text.secondary">
                {t('alreadyHaveAccount')}{' '}
                <Button
                  onClick={() => setTab('login')}
                  disabled={loading}
                  sx={{ textTransform: 'none', p: 0, minWidth: 'auto' }}
                >
                  {t('login')}
                </Button>
              </Typography>
            </Box>
          </Box>
        )}
      </DialogContent>
    </Dialog>
  )
}