import { useState } from 'react';
import { Button, Dialog, DialogActions, DialogContent, DialogTitle, MenuItem, Stack, TextField } from '@mui/material';
import { useCreateCustomer } from '../../../hooks/useCustomers';
import { useSegmentDefinitions } from '../../../hooks/useSegments';

export function CustomerDialog({ open, onClose }: { open: boolean; onClose: () => void }) {
  const createCustomer = useCreateCustomer();
  const { data: definitions } = useSegmentDefinitions();
  const branchDef = (definitions ?? []).find((def) => def.isBranchSegment);

  const [code, setCode] = useState('');
  const [name, setName] = useState('');
  const [email, setEmail] = useState('');
  const [phone, setPhone] = useState('');
  const [branchSegmentValueId, setBranchSegmentValueId] = useState<number | ''>('');
  const [creditLimit, setCreditLimit] = useState('');
  const [paymentTermsDays, setPaymentTermsDays] = useState('30');
  const [error, setError] = useState<string | null>(null);

  const reset = () => {
    setCode('');
    setName('');
    setEmail('');
    setPhone('');
    setBranchSegmentValueId('');
    setCreditLimit('');
    setPaymentTermsDays('30');
  };

  const handleSubmit = async () => {
    setError(null);
    if (!branchSegmentValueId) {
      setError('Select a branch');
      return;
    }
    try {
      await createCustomer.mutateAsync({
        code,
        name,
        email: email || undefined,
        phone: phone || undefined,
        branchSegmentValueId,
        creditLimit: creditLimit ? Number(creditLimit) : undefined,
        paymentTermsDays: paymentTermsDays ? Number(paymentTermsDays) : undefined,
      });
      onClose();
      reset();
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to create customer');
    }
  };

  return (
    <Dialog open={open} onClose={onClose} maxWidth="xs" fullWidth>
      <DialogTitle>New Customer</DialogTitle>
      <DialogContent>
        <Stack spacing={2} sx={{ mt: 1 }}>
          <TextField label="Customer code" value={code} onChange={(e) => setCode(e.target.value)} />
          <TextField label="Name" value={name} onChange={(e) => setName(e.target.value)} />
          <TextField label="Email" type="email" value={email} onChange={(e) => setEmail(e.target.value)} />
          <TextField label="Phone" value={phone} onChange={(e) => setPhone(e.target.value)} />
          <TextField
            select
            label="Branch"
            value={branchSegmentValueId}
            onChange={(e) => setBranchSegmentValueId(Number(e.target.value))}
          >
            {(branchDef?.values ?? []).map((value) => (
              <MenuItem key={value.id} value={value.id}>
                {value.code} — {value.description}
              </MenuItem>
            ))}
          </TextField>
          <Stack direction="row" spacing={2}>
            <TextField
              label="Credit limit"
              type="number"
              value={creditLimit}
              onChange={(e) => setCreditLimit(e.target.value)}
              fullWidth
            />
            <TextField
              label="Payment terms (days)"
              type="number"
              value={paymentTermsDays}
              onChange={(e) => setPaymentTermsDays(e.target.value)}
              fullWidth
            />
          </Stack>
          {error && <span style={{ color: 'red' }}>{error}</span>}
        </Stack>
      </DialogContent>
      <DialogActions>
        <Button onClick={onClose}>Cancel</Button>
        <Button variant="contained" onClick={handleSubmit} disabled={createCustomer.isPending}>
          Create
        </Button>
      </DialogActions>
    </Dialog>
  );
}