import { useEffect } from 'react';
import { Drawer, Select, TextInput, Button, Group, Stack, Text, LoadingOverlay, Box } from '@mantine/core';
import { DateInput } from '@mantine/dates';
import { useForm, Controller } from 'react-hook-form';
import { zodResolver } from '@hookform/resolvers/zod';
import { z } from 'zod';
import { useMutation, useQueryClient } from '@tanstack/react-query';
import { notifications } from '@mantine/notifications';
import dayjs from 'dayjs';
import { apiClient } from '../../../api/client';
import type { Qualification } from '../../../api/types';

const font = "'Montserrat', Arial, sans-serif";
const teal = '#008286';

const schema = z.object({
  categorie: z.enum(['fara', 'cat_II', 'cat_I', 'superioara']),
  specialitate: z.string().optional(),
  dataObtinerii: z.string().regex(/^\d{4}-\d{2}-\d{2}$/).optional().or(z.literal('')),
  dataUltimeiConfirmari: z.string().regex(/^\d{4}-\d{2}-\d{2}$/).optional().or(z.literal('')),
  dataExpirarii: z.string().regex(/^\d{4}-\d{2}-\d{2}$/).optional().or(z.literal('')),
});
type FormValues = z.infer<typeof schema>;

interface Props { employeeId: string; record?: Qualification; opened: boolean; onClose: () => void }

export function QualificationDrawer({ employeeId, record, opened, onClose }: Props) {
  const isEdit = !!record;
  const qc = useQueryClient();

  const { register, handleSubmit, control, reset, formState: { errors, isSubmitting } } =
    useForm<FormValues>({ resolver: zodResolver(schema) });

  useEffect(() => {
    reset(record ? {
      categorie: record.categorie,
      specialitate: record.specialitate ?? '',
      dataObtinerii: record.dataObtinerii?.slice(0, 10) ?? '',
      dataUltimeiConfirmari: record.dataUltimeiConfirmari?.slice(0, 10) ?? '',
      dataExpirarii: record.dataExpirarii?.slice(0, 10) ?? '',
    } : {});
  }, [record, reset, opened]);

  const mutation = useMutation({
    mutationFn: (data: FormValues) => {
      const payload = { ...data, dataObtinerii: data.dataObtinerii || undefined, dataUltimeiConfirmari: data.dataUltimeiConfirmari || undefined, dataExpirarii: data.dataExpirarii || undefined };
      return isEdit
        ? apiClient.patch(`/employees/${employeeId}/qualifications/${record.id}`, payload)
        : apiClient.post(`/employees/${employeeId}/qualifications`, payload);
    },
    onSuccess: () => { void qc.invalidateQueries({ queryKey: ['employee', employeeId] }); notifications.show({ color: 'medpark', title: 'Salvat', message: 'Calificare actualizată.' }); onClose(); },
    onError: () => notifications.show({ color: 'red', title: 'Eroare', message: 'Nu s-a putut salva.' }),
  });

  return (
    <Drawer opened={opened} onClose={onClose} position="right" size="md"
      title={<Text style={{ fontFamily: font, fontWeight: 700, color: '#58595b' }}>{isEdit ? 'Editează calificare' : 'Calificare nouă'}</Text>}
      styles={{ header: { borderBottom: `2px solid ${teal}` }, body: { padding: '16px 24px 24px' } }}
    >
      <Box style={{ position: 'relative' }}><LoadingOverlay visible={isSubmitting} />
        <form onSubmit={handleSubmit((d) => mutation.mutate(d))}>
          <Stack gap={12}>
            <Controller name="categorie" control={control} render={({ field }) => (
              <Select label="Categorie *" data={[
                { value: 'fara', label: 'Fără categorie' }, { value: 'cat_II', label: 'Categoria II' },
                { value: 'cat_I', label: 'Categoria I' }, { value: 'superioara', label: 'Superioară' },
              ]} value={field.value} onChange={field.onChange} error={errors.categorie?.message}
                styles={{ label: { fontFamily: font, fontWeight: 500, fontSize: '0.8rem' } }} />
            )} />
            <TextInput label="Specialitate" styles={{ label: { fontFamily: font, fontWeight: 500, fontSize: '0.8rem' } }} {...register('specialitate')} />
            <Controller name="dataObtinerii" control={control} render={({ field }) => (
              <DateInput label="Data obținerii" valueFormat="YYYY-MM-DD" value={field.value ? new Date(field.value) : null}
                onChange={(d) => field.onChange(d ? dayjs(d).format('YYYY-MM-DD') : '')} styles={{ label: { fontFamily: font, fontWeight: 500, fontSize: '0.8rem' } }} />
            )} />
            <Controller name="dataUltimeiConfirmari" control={control} render={({ field }) => (
              <DateInput label="Ultima confirmare" valueFormat="YYYY-MM-DD" value={field.value ? new Date(field.value) : null}
                onChange={(d) => field.onChange(d ? dayjs(d).format('YYYY-MM-DD') : '')} styles={{ label: { fontFamily: font, fontWeight: 500, fontSize: '0.8rem' } }} />
            )} />
            <Controller name="dataExpirarii" control={control} render={({ field }) => (
              <DateInput label="Data expirării" valueFormat="YYYY-MM-DD" value={field.value ? new Date(field.value) : null}
                onChange={(d) => field.onChange(d ? dayjs(d).format('YYYY-MM-DD') : '')} styles={{ label: { fontFamily: font, fontWeight: 500, fontSize: '0.8rem' } }} />
            )} />
          </Stack>
          <Group justify="flex-end" mt={24} pt={16} style={{ borderTop: '1px solid #e9ecef' }}>
            <Button variant="subtle" onClick={onClose} style={{ fontFamily: font, color: '#58595b' }}>Anulează</Button>
            <Button type="submit" loading={isSubmitting} style={{ background: teal, fontFamily: font, fontWeight: 500 }}>Salvează</Button>
          </Group>
        </form>
      </Box>
    </Drawer>
  );
}