import { useState, FormEvent } from 'react';
import { useMutation, useQueryClient } from '@tanstack/react-query';
import { toast } from 'sonner';
import api, { getErrorMessage } from '@/lib/api';
import type { Reminder } from '@/types';
import {
  Sheet,
  SheetContent,
  SheetHeader,
  SheetTitle,
  SheetFooter,
  SheetClose,
} from '@/components/ui/sheet';
import { Input } from '@/components/ui/input';
import { Textarea } from '@/components/ui/textarea';
import { Select } from '@/components/ui/select';
import { Label } from '@/components/ui/label';
import { Button } from '@/components/ui/button';

interface ReminderFormProps {
  reminder: Reminder | null;
  onClose: () => void;
}

export default function ReminderForm({ reminder, onClose }: ReminderFormProps) {
  const queryClient = useQueryClient();
  const [formData, setFormData] = useState({
    title: reminder?.title || '',
    description: reminder?.description || '',
    remind_at: reminder?.remind_at ? reminder.remind_at.slice(0, 16) : '',
    recurrence_rule: reminder?.recurrence_rule || '',
  });

  const mutation = useMutation({
    mutationFn: async (data: typeof formData) => {
      if (reminder) {
        const response = await api.put(`/reminders/${reminder.id}`, data);
        return response.data;
      } else {
        const response = await api.post('/reminders', data);
        return response.data;
      }
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['reminders'] });
      queryClient.invalidateQueries({ queryKey: ['dashboard'] });
      queryClient.invalidateQueries({ queryKey: ['upcoming'] });
      toast.success(reminder ? 'Reminder updated' : 'Reminder created');
      onClose();
    },
    onError: (error) => {
      toast.error(getErrorMessage(error, reminder ? 'Failed to update reminder' : 'Failed to create reminder'));
    },
  });

  const handleSubmit = (e: FormEvent) => {
    e.preventDefault();
    mutation.mutate(formData);
  };

  return (
    <Sheet open={true} onOpenChange={onClose}>
      <SheetContent>
        <SheetClose onClick={onClose} />
        <SheetHeader>
          <SheetTitle>{reminder ? 'Edit Reminder' : 'New Reminder'}</SheetTitle>
        </SheetHeader>
        <form onSubmit={handleSubmit} className="flex flex-col flex-1 overflow-y-auto">
          <div className="px-6 py-5 space-y-4 flex-1">
            <div className="space-y-2">
              <Label htmlFor="title">Title</Label>
              <Input
                id="title"
                value={formData.title}
                onChange={(e) => setFormData({ ...formData, title: e.target.value })}
                required
              />
            </div>

            <div className="space-y-2">
              <Label htmlFor="description">Description</Label>
              <Textarea
                id="description"
                value={formData.description}
                onChange={(e) => setFormData({ ...formData, description: e.target.value })}
                rows={4}
              />
            </div>

            <div className="grid grid-cols-2 gap-4">
              <div className="space-y-2">
                <Label htmlFor="remind_at">Remind At</Label>
                <Input
                  id="remind_at"
                  type="datetime-local"
                  value={formData.remind_at}
                  onChange={(e) => setFormData({ ...formData, remind_at: e.target.value })}
                  required
                />
              </div>

              <div className="space-y-2">
                <Label htmlFor="recurrence">Recurrence</Label>
                <Select
                  id="recurrence"
                  value={formData.recurrence_rule}
                  onChange={(e) => setFormData({ ...formData, recurrence_rule: e.target.value })}
                >
                  <option value="">None</option>
                  <option value="daily">Daily</option>
                  <option value="weekly">Weekly</option>
                  <option value="monthly">Monthly</option>
                </Select>
              </div>
            </div>
          </div>

          <SheetFooter>
            <Button type="button" variant="outline" onClick={onClose}>
              Cancel
            </Button>
            <Button type="submit" disabled={mutation.isPending}>
              {mutation.isPending ? 'Saving...' : reminder ? 'Update' : 'Create'}
            </Button>
          </SheetFooter>
        </form>
      </SheetContent>
    </Sheet>
  );
}