"use client";

import { useEffect, useState } from 'react';
import { useSearchParams } from 'next/navigation';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Textarea } from '@/components/ui/textarea';
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';
import { Skeleton } from '@/components/ui/skeleton';
import { api } from '@/lib/api';
import { Doctor } from '@/types';
import { Calendar, Clock, Stethoscope, CheckCircle } from 'lucide-react';
import toast from 'react-hot-toast';

export default function BookAppointmentPage() {
  const searchParams = useSearchParams();
  const preselectedDoctor = searchParams.get('doctor');

  const [doctors, setDoctors] = useState<Doctor[]>([]);
  const [loading, setLoading] = useState(true);
  const [submitting, setSubmitting] = useState(false);
  const [success, setSuccess] = useState(false);
  const [formData, setFormData] = useState({
    doctor_id: preselectedDoctor || '',
    appointment_date: '',
    type: 'consultation',
    symptoms: '',
    notes: '',
  });

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

  const fetchDoctors = async () => {
    try {
      const response = await api.get('/doctors?available=true');
      setDoctors(response.data.data);
    } catch (error) {
      console.error('Failed to fetch doctors');
    } finally {
      setLoading(false);
    }
  };

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setSubmitting(true);

    try {
      await api.post('/appointments', formData);
      setSuccess(true);
      toast.success('Appointment booked successfully!');
    } catch (error: any) {
      toast.error(error.response?.data?.message || 'Failed to book appointment');
    } finally {
      setSubmitting(false);
    }
  };

  if (success) {
    return (
      <div className="container mx-auto px-4 py-16">
        <Card className="max-w-md mx-auto text-center">
          <CardContent className="pt-6">
            <CheckCircle className="mx-auto h-16 w-16 text-medical-500 mb-4" />
            <h2 className="text-2xl font-bold mb-2">Appointment Booked!</h2>
            <p className="text-muted-foreground mb-6">
              Your appointment request has been submitted. You will receive a confirmation 
              once it is approved by our team.
            </p>
            <Button onClick={() => setSuccess(false)}>Book Another</Button>
          </CardContent>
        </Card>
      </div>
    );
  }

  if (loading) {
    return (
      <div className="container mx-auto px-4 py-16">
        <Skeleton className="h-96 max-w-2xl mx-auto" />
      </div>
    );
  }

  return (
    <div className="container mx-auto px-4 py-16">
      <div className="max-w-2xl mx-auto">
        <div className="text-center mb-8">
          <h1 className="text-3xl font-bold mb-2">Book an Appointment</h1>
          <p className="text-muted-foreground">Schedule a consultation with our medical professionals</p>
        </div>

        <Card>
          <CardHeader>
            <CardTitle className="flex items-center gap-2">
              <Calendar className="h-5 w-5" />
              Appointment Details
            </CardTitle>
          </CardHeader>
          <CardContent>
            <form onSubmit={handleSubmit} className="space-y-6">
              <div className="space-y-2">
                <Label htmlFor="doctor">Select Doctor</Label>
                <Select
                  value={formData.doctor_id}
                  onValueChange={(value) => setFormData({ ...formData, doctor_id: value })}
                >
                  <SelectTrigger>
                    <SelectValue placeholder="Choose a doctor" />
                  </SelectTrigger>
                  <SelectContent>
                    {doctors.map((doctor) => (
                      <SelectItem key={doctor.id} value={String(doctor.id)}>
                        <div className="flex items-center gap-2">
                          <Stethoscope className="h-4 w-4" />
                          {doctor.staff?.user?.name} - {doctor.specialization}
                        </div>
                      </SelectItem>
                    ))}
                  </SelectContent>
                </Select>
              </div>

              <div className="space-y-2">
                <Label htmlFor="date">Appointment Date & Time</Label>
                <Input
                  id="date"
                  type="datetime-local"
                  value={formData.appointment_date}
                  onChange={(e) => setFormData({ ...formData, appointment_date: e.target.value })}
                  min={new Date().toISOString().slice(0, 16)}
                  required
                />
              </div>

              <div className="space-y-2">
                <Label htmlFor="type">Appointment Type</Label>
                <Select
                  value={formData.type}
                  onValueChange={(value) => setFormData({ ...formData, type: value })}
                >
                  <SelectTrigger><SelectValue /></SelectTrigger>
                  <SelectContent>
                    <SelectItem value="consultation">Consultation</SelectItem>
                    <SelectItem value="follow_up">Follow-up</SelectItem>
                    <SelectItem value="routine_checkup">Routine Checkup</SelectItem>
                    <SelectItem value="emergency">Emergency</SelectItem>
                  </SelectContent>
                </Select>
              </div>

              <div className="space-y-2">
                <Label htmlFor="symptoms">Symptoms (Optional)</Label>
                <Textarea
                  id="symptoms"
                  placeholder="Describe your symptoms..."
                  value={formData.symptoms}
                  onChange={(e) => setFormData({ ...formData, symptoms: e.target.value })}
                  rows={3}
                />
              </div>

              <div className="space-y-2">
                <Label htmlFor="notes">Additional Notes (Optional)</Label>
                <Textarea
                  id="notes"
                  placeholder="Any additional information..."
                  value={formData.notes}
                  onChange={(e) => setFormData({ ...formData, notes: e.target.value })}
                  rows={2}
                />
              </div>

              <Button type="submit" className="w-full" disabled={submitting}>
                <Clock className="mr-2 h-4 w-4" />
                {submitting ? 'Booking...' : 'Book Appointment'}
              </Button>
            </form>
          </CardContent>
        </Card>
      </div>
    </div>
  );
}