import { useState, useEffect } from 'react';
import { useNavigate } from 'react-router-dom';
import {
  Box,
  Button,
  Paper,
  Typography,
  Table,
  TableBody,
  TableCell,
  TableContainer,
  TableHead,
  TableRow,
  Chip,
  CircularProgress,
  Dialog,
  DialogTitle,
  DialogContent,
  DialogActions,
  TextField,
  MenuItem,
} from '@mui/material';
import { Add, Check, Close } from '@mui/icons-material';
import { tokenService } from '../services/tokenService';
import { companyService } from '../services/companyService';
import { templateService } from '../services/templateService';
import { format } from 'date-fns';

function Tokens() {
  const navigate = useNavigate();
  const [tokens, setTokens] = useState([]);
  const [companies, setCompanies] = useState([]);
  const [templates, setTemplates] = useState([]);
  const [loading, setLoading] = useState(true);
  const [openDialog, setOpenDialog] = useState(false);
  const [formData, setFormData] = useState({
    company_id: '',
    target_email: '',
    employee_name: '',
    template_type: 'bank',
  });

  useEffect(() => {
    loadData();
  }, []);

  const loadData = async () => {
    try {
      const [tokensData, companiesData, templatesData] = await Promise.all([
        tokenService.getAll(),
        companyService.getAll(),
        templateService.getAll(),
      ]);
      setTokens(tokensData.data);
      setCompanies(companiesData.data);
      setTemplates(templatesData.data);
    } catch (error) {
      console.error('Failed to load data:', error);
    } finally {
      setLoading(false);
    }
  };

  const handleCreateAndSend = async () => {
    try {
      await tokenService.createAndSend(formData);
      setOpenDialog(false);
      setFormData({ company_id: '', target_email: '', employee_name: '', template_type: 'bank' });
      loadData();
      alert('Token oluşturuldu ve mail gönderildi!');
    } catch (error) {
      console.error('Failed to create token:', error);
      alert('Token oluşturulamadı: ' + (error.response?.data?.error || error.message));
    }
  };

  if (loading) {
    return (
      <Box display="flex" justifyContent="center" alignItems="center" minHeight="400px">
        <CircularProgress />
      </Box>
    );
  }

  return (
    <Box>
      <Box display="flex" justifyContent="space-between" alignItems="center" mb={3}>
        <Typography variant="h4">Tracking Tokenlar</Typography>
        <Button
          variant="contained"
          startIcon={<Add />}
          onClick={() => setOpenDialog(true)}
        >
          Yeni Mail Oluştur
        </Button>
      </Box>

      <TableContainer component={Paper}>
        <Table>
          <TableHead>
            <TableRow>
              <TableCell>Email</TableCell>
              <TableCell>Şirket</TableCell>
              <TableCell>Çalışan</TableCell>
              <TableCell>Durum</TableCell>
              <TableCell align="right">Tıklama</TableCell>
              <TableCell>Tarih</TableCell>
            </TableRow>
          </TableHead>
          <TableBody>
            {tokens.map((token) => (
              <TableRow 
                key={token.id} 
                hover 
                sx={{ cursor: 'pointer' }}
                onClick={() => navigate(`/tokens/${token.id}`)}
              >
                <TableCell>{token.target_email}</TableCell>
                <TableCell>{token.company?.name}</TableCell>
                <TableCell>{token.employee_name || '-'}</TableCell>
                <TableCell>
                  <Chip
                    icon={token.clicked ? <Check /> : <Close />}
                    label={token.clicked ? 'Tıklandı' : 'Bekliyor'}
                    color={token.clicked ? 'success' : 'default'}
                    size="small"
                  />
                </TableCell>
                <TableCell align="right">{token.click_count}×</TableCell>
                <TableCell>
                  {format(new Date(token.created_at), 'dd/MM/yyyy HH:mm')}
                </TableCell>
              </TableRow>
            ))}
          </TableBody>
        </Table>
      </TableContainer>

      <Dialog open={openDialog} onClose={() => setOpenDialog(false)} maxWidth="sm" fullWidth>
        <DialogTitle>Yeni Token Oluştur ve Mail Gönder</DialogTitle>
        <DialogContent>
          <TextField
            select
            margin="dense"
            label="Şirket Seç"
            fullWidth
            required
            value={formData.company_id}
            onChange={(e) => setFormData({ ...formData, company_id: e.target.value })}
          >
            {companies.map((company) => (
              <MenuItem key={company.id} value={company.id}>
                {company.name}
              </MenuItem>
            ))}
          </TextField>
          <TextField
            margin="dense"
            label="Hedef Email"
            type="email"
            fullWidth
            required
            value={formData.target_email}
            onChange={(e) => setFormData({ ...formData, target_email: e.target.value })}
          />
          <TextField
            margin="dense"
            label="Çalışan Adı (Opsiyonel)"
            fullWidth
            value={formData.employee_name}
            onChange={(e) => setFormData({ ...formData, employee_name: e.target.value })}
          />
          <TextField
            select
            margin="dense"
            label="Mail Şablonu"
            fullWidth
            required
            value={formData.template_type}
            onChange={(e) => setFormData({ ...formData, template_type: e.target.value })}
          >
            {templates.map((template) => (
              <MenuItem key={template.id} value={template.template_type}>
                {template.name}
              </MenuItem>
            ))}
          </TextField>
        </DialogContent>
        <DialogActions>
          <Button onClick={() => setOpenDialog(false)}>İptal</Button>
          <Button
            onClick={handleCreateAndSend}
            variant="contained"
            disabled={!formData.company_id || !formData.target_email}
          >
            Oluştur ve Gönder
          </Button>
        </DialogActions>
      </Dialog>
    </Box>
  );
}

export default Tokens;