import React, { useState, useCallback, useRef, useEffect } from 'react';
import { type Service } from '../types';
import { generateServiceDescription } from '../services/geminiService';
import { Globe, Loader2 } from 'lucide-react';

interface AddServiceModalProps {
  onClose: () => void;
  onAddService: (service: Omit<Service, 'id'>) => void;
}

const AddServiceModal: React.FC<AddServiceModalProps> = ({ onClose, onAddService }) => {
  const [name, setName] = useState('');
  const [url, setUrl] = useState('');
  const [description, setDescription] = useState('');
  const [isFetchingDesc, setIsFetchingDesc] = useState(false);
  const modalRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const handleClickOutside = (event: MouseEvent) => {
      if (modalRef.current && !modalRef.current.contains(event.target as Node)) {
        onClose();
      }
    };
    document.addEventListener('mousedown', handleClickOutside);
    return () => {
      document.removeEventListener('mousedown', handleClickOutside);
    };
  }, [onClose]);

  const handleFetchDescription = useCallback(async () => {
    if (name.trim().length > 2 && process.env.API_KEY) {
      setIsFetchingDesc(true);
      const desc = await generateServiceDescription(name);
      setDescription(desc);
      setIsFetchingDesc(false);
    }
  }, [name]);

  const handleSubmit = (e: React.FormEvent<HTMLFormElement>) => {
    e.preventDefault();
    if (name && url) {
      onAddService({
        name,
        url,
        description: description || `A local service at ${url}`,
        icon: Globe,
      });
      onClose();
    }
  };

  return (
    <div className="fixed inset-0 bg-black bg-opacity-70 z-50 flex justify-center items-center p-4">
      <div ref={modalRef} className="bg-gray-800 rounded-lg shadow-xl w-full max-w-md p-6 border border-gray-700">
        <h2 className="text-2xl font-bold mb-6 text-white">Add a New Service</h2>
        <form onSubmit={handleSubmit}>
          <div className="space-y-4">
            <div>
              <label htmlFor="name" className="block text-sm font-medium text-gray-300">
                Service Name
              </label>
              <input
                type="text"
                id="name"
                value={name}
                onChange={(e) => setName(e.target.value)}
                onBlur={handleFetchDescription}
                className="mt-1 block w-full bg-gray-900 border border-gray-600 rounded-md shadow-sm py-2 px-3 text-white focus:outline-none focus:ring-teal-500 focus:border-teal-500 sm:text-sm"
                placeholder="e.g., Home Assistant"
                required
              />
            </div>
            <div>
              <label htmlFor="url" className="block text-sm font-medium text-gray-300">
                URL (including http/https)
              </label>
              <input
                type="text"
                id="url"
                value={url}
                onChange={(e) => setUrl(e.target.value)}
                className="mt-1 block w-full bg-gray-900 border border-gray-600 rounded-md shadow-sm py-2 px-3 text-white focus:outline-none focus:ring-teal-500 focus:border-teal-500 sm:text-sm"
                placeholder="http://192.168.1.100:8123"
                required
              />
            </div>
            <div>
              <label htmlFor="description" className="block text-sm font-medium text-gray-300">
                Description
              </label>
              <div className="relative">
                <textarea
                  id="description"
                  rows={3}
                  value={description}
                  onChange={(e) => setDescription(e.target.value)}
                  className="mt-1 block w-full bg-gray-900 border border-gray-600 rounded-md shadow-sm py-2 px-3 text-white focus:outline-none focus:ring-teal-500 focus:border-teal-500 sm:text-sm"
                  placeholder="A short description of the service..."
                />
                {isFetchingDesc && (
                    <div className="absolute inset-y-0 right-3 flex items-center">
                       <Loader2 className="h-5 w-5 text-teal-400 animate-spin" />
                    </div>
                )}
              </div>
            </div>
          </div>
          <div className="mt-8 flex justify-end space-x-3">
            <button
              type="button"
              onClick={onClose}
              className="px-4 py-2 text-sm font-medium text-gray-300 bg-gray-700 rounded-md hover:bg-gray-600 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-offset-gray-800 focus:ring-gray-500"
            >
              Cancel
            </button>
            <button
              type="submit"
              className="px-4 py-2 text-sm font-medium text-white bg-teal-500 rounded-md shadow-sm hover:bg-teal-600 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-offset-gray-800 focus:ring-teal-500"
            >
              Add Service
            </button>
          </div>
        </form>
      </div>
    </div>
  );
};

export default AddServiceModal;