/*
Copyright (C) 2023-2026 QuantumNous

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.

For commercial licensing, please contact support@quantumnous.com
*/
import { useState } from 'react'
import { RefreshCw, Loader2 } from 'lucide-react'
import { useTranslation } from 'react-i18next'
import { toast } from 'sonner'
import { regenerate2FABackupCodes } from '@/lib/api'
import { Alert, AlertDescription } from '@/components/ui/alert'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { Label } from '@/components/ui/label'
import { CopyButton } from '@/components/copy-button'
import { Dialog } from '@/components/dialog'

// ============================================================================
// Two-FA Backup Codes Dialog Component
// ============================================================================

interface TwoFABackupDialogProps {
  open: boolean
  onOpenChange: (open: boolean) => void
  onSuccess: () => void
}

export function TwoFABackupDialog({
  open,
  onOpenChange,
  onSuccess,
}: TwoFABackupDialogProps) {
  const { t } = useTranslation()
  const [loading, setLoading] = useState(false)
  const [code, setCode] = useState('')
  const [backupCodes, setBackupCodes] = useState<string[]>([])

  const handleRegenerate = async () => {
    if (!code) {
      toast.error(t('Please enter your verification code'))
      return
    }

    try {
      setLoading(true)
      const response = await regenerate2FABackupCodes(code)

      if (response.success && response.data?.backup_codes) {
        setBackupCodes(response.data.backup_codes)
        toast.success(t('Backup codes regenerated successfully'))
      } else {
        toast.error(response.message || t('Failed to regenerate backup codes'))
      }
    } catch (_error) {
      toast.error(t('Failed to regenerate backup codes'))
    } finally {
      setLoading(false)
    }
  }

  const handleDone = () => {
    handleOpenChange(false)
    onSuccess()
  }

  const handleOpenChange = (open: boolean) => {
    if (!loading) {
      if (!open) {
        setCode('')
        setBackupCodes([])
      }
      onOpenChange(open)
    }
  }

  return (
    <Dialog
      open={open}
      onOpenChange={handleOpenChange}
      title={
        <>
          <RefreshCw className='h-5 w-5' />
          {t('Regenerate Backup Codes')}
        </>
      }
      description={
        backupCodes.length > 0
          ? t('Your new backup codes are ready')
          : t('Generate new backup codes for account recovery')
      }
      contentClassName='sm:max-w-md'
      titleClassName='flex items-center gap-2'
      contentHeight='auto'
      bodyClassName='space-y-4'
      footer={
        <>
          {backupCodes.length === 0 ? (
            <>
              <Button
                variant='outline'
                onClick={() => handleOpenChange(false)}
                disabled={loading}
              >
                {t('Cancel')}
              </Button>
              <Button onClick={handleRegenerate} disabled={loading || !code}>
                {loading && <Loader2 className='mr-2 h-4 w-4 animate-spin' />}
                {loading ? t('Generating...') : t('Generate New Codes')}
              </Button>
            </>
          ) : (
            <Button onClick={handleDone}>{t('Done')}</Button>
          )}
        </>
      }
    >
      <div className='space-y-4 py-4'>
        {backupCodes.length === 0 ? (
          <>
            <Alert>
              <AlertDescription>
                {t(
                  'Generating new codes will invalidate all existing backup codes.'
                )}
              </AlertDescription>
            </Alert>

            <div className='space-y-2'>
              <Label htmlFor='code'>{t('Verification Code')}</Label>
              <Input
                id='code'
                value={code}
                onChange={(e) => setCode(e.target.value)}
                placeholder={t('Enter authenticator code')}
                maxLength={6}
                disabled={loading}
              />
            </div>
          </>
        ) : (
          <>
            <Alert>
              <AlertDescription>
                {t(
                  'Save these codes in a safe place. Each code can only be used once.'
                )}
              </AlertDescription>
            </Alert>

            <div className='rounded-lg border p-4'>
              <div className='grid grid-cols-2 gap-2'>
                {backupCodes.map((code, index) => (
                  <div
                    key={index}
                    className='bg-muted rounded-md p-2 text-center font-mono text-sm'
                  >
                    {code}
                  </div>
                ))}
              </div>
            </div>

            <CopyButton
              value={backupCodes.join('\n')}
              variant='outline'
              size='default'
              className='w-full'
              iconClassName='mr-2 size-4'
              tooltip={t('Copy all backup codes')}
              aria-label={t('Copy all backup codes')}
            >
              {t('Copy All Codes')}
            </CopyButton>
          </>
        )}
      </div>
    </Dialog>
  )
}