import React, { useState } from 'react';
import {
  Dialog,
  DialogContent,
  DialogActions,
  TextField,
  Button,
  Box,
  Typography,
  Alert,
  Link,
  IconButton,
  InputAdornment,
  Divider,
} from '@mui/material';
import { Visibility, VisibilityOff, AccountCircle } from '@mui/icons-material';
import { useAuth } from '../contexts/AuthContext';
import DraggablePaper from './DraggablePaper';
import GoldenPopupDialogTitle from './GoldenPopupDialogTitle';

interface LoginDialogProps {
  open: boolean;
  onClose: () => void;
  onSwitchToSignUp: () => void;
}

const LoginDialog: React.FC<LoginDialogProps> = ({ open, onClose, onSwitchToSignUp }) => {
  const { login } = useAuth();
  const [usernameOrEmail, setUsernameOrEmail] = useState('');
  const [password, setPassword] = useState('');
  const [showPassword, setShowPassword] = useState(false);
  const [error, setError] = useState('');
  const [isLoading, setIsLoading] = useState(false);

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError('');

    if (!usernameOrEmail || !password) {
      setError('모든 필드를 입력해주세요.');
      return;
    }

    setIsLoading(true);
    try {
      await login(usernameOrEmail, password);
      handleClose();
    } catch (err: any) {
      setError(err.response?.data?.error || '로그인에 실패했습니다. 아이디와 비밀번호를 확인해주세요.');
    } finally {
      setIsLoading(false);
    }
  };

  const handleClose = () => {
    setUsernameOrEmail('');
    setPassword('');
    setError('');
    setShowPassword(false);
    onClose();
  };

  // 테스트 계정으로 자동 로그인
  const handleTestLogin = async (username: string, password: string) => {
    setError('');
    setIsLoading(true);
    try {
      await login(username, password);
      handleClose();
    } catch (err: any) {
      setError(err.response?.data?.error || '로그인에 실패했습니다.');
    } finally {
      setIsLoading(false);
    }
  };

  return (
    <Dialog 
      open={open} 
      onClose={handleClose} 
      maxWidth="xs" 
      fullWidth
      hideBackdrop={true}
      disableScrollLock={true}
      PaperComponent={DraggablePaper}
      sx={{
        pointerEvents: 'none',
        '& .MuiDialog-container': {
          pointerEvents: 'none',
          alignItems: 'center',
          justifyContent: 'center',
        },
      }}
      PaperProps={{
        sx: { pointerEvents: 'auto' },
      }}
    >
      <GoldenPopupDialogTitle badge="AUTH" title="LOGIN" titleKo="로그인" onClose={handleClose} />

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

          <TextField
            fullWidth
            label="사용자명 또는 이메일"
            value={usernameOrEmail}
            onChange={(e) => setUsernameOrEmail(e.target.value)}
            margin="normal"
            autoFocus
            disabled={isLoading}
          />

          <TextField
            fullWidth
            label="비밀번호"
            type={showPassword ? 'text' : 'password'}
            value={password}
            onChange={(e) => setPassword(e.target.value)}
            margin="normal"
            disabled={isLoading}
            InputProps={{
              endAdornment: (
                <InputAdornment position="end">
                  <IconButton
                    onClick={() => setShowPassword(!showPassword)}
                    edge="end"
                  >
                    {showPassword ? <VisibilityOff /> : <Visibility />}
                  </IconButton>
                </InputAdornment>
              ),
            }}
          />

          <Box sx={{ mt: 2, textAlign: 'center' }}>
            <Typography variant="body2" color="text.secondary">
              계정이 없으신가요?{' '}
              <Link
                component="button"
                type="button"
                onClick={() => {
                  handleClose();
                  onSwitchToSignUp();
                }}
                sx={{ cursor: 'pointer' }}
              >
                회원가입
              </Link>
            </Typography>
          </Box>
        </DialogContent>

        <DialogActions sx={{ px: 3, pb: 2, flexDirection: 'column', gap: 2 }}>
          <Box sx={{ display: 'flex', gap: 1, width: '100%' }}>
            <Button 
              onClick={handleClose} 
              disabled={isLoading}
              variant="outlined"
              fullWidth
            >
              취소
            </Button>
            <Button
              type="submit"
              variant="contained"
              disabled={isLoading}
              fullWidth
            >
              {isLoading ? '로그인 중...' : '로그인'}
            </Button>
          </Box>

          <Divider sx={{ width: '100%' }}>
            <Typography variant="caption" color="text.secondary">
              테스트 계정
            </Typography>
          </Divider>

          <Box sx={{ display: 'flex', flexDirection: 'column', gap: 1, width: '100%' }}>
            <Button
              variant="outlined"
              color="secondary"
              startIcon={<AccountCircle />}
              onClick={() => handleTestLogin('test1', 'test1')}
              disabled={isLoading}
              fullWidth
            >
              Test 계정1
            </Button>
            <Button
              variant="outlined"
              color="secondary"
              startIcon={<AccountCircle />}
              onClick={() => handleTestLogin('test2', 'test2')}
              disabled={isLoading}
              fullWidth
            >
              Test 계정2
            </Button>
            <Button
              variant="outlined"
              color="secondary"
              startIcon={<AccountCircle />}
              onClick={() => handleTestLogin('test3', 'test3')}
              disabled={isLoading}
              fullWidth
            >
              Test 계정3
            </Button>
          </Box>
        </DialogActions>
      </form>
    </Dialog>
  );
};

export default LoginDialog;