trying to post text with images,videos/audios files

class Postscreen extends StatefulWidget {
  const Postscreen({Key? key}) : super(key: key);

  @override
  State<Postscreen> createState() => _PostscreenState();
}

class _PostscreenState extends State<Postscreen> {
  //post messges
  final FirestoreDatabase database = FirestoreDatabase();
  final posttitleController = TextEditingController();
  final postController = TextEditingController();
  final postfileController= TextEditingController();
  final FirebaseStorage storage = FirebaseStorage.instance;
  final currentUser = FirebaseAuth.instance.currentUser!;

  @override
  initState() {
    super.initState();
  }
//pick files and uploading them to firebase after i download the url
  PlatformFile? pickedFile;
  UploadTask? uploadTask;
  Future selectFile()async{
    final result= await FilePicker.platform.pickFiles();
    if (result==null) return;
    setState(() {
      pickedFile=result.files.first;
    });
    String? mimeStr = lookupMimeType(pickedFile!.path!);
    var fileType = mimeStr?.split('/');
    print('file type $fileType');
    try {

      final path = 'postfiles/${pickedFile!.name}';
      final file = File(pickedFile!.path!);
      final ref = FirebaseStorage.instance.ref().child(path);
      uploadTask = ref.putFile(file);
      final imageUrl = await uploadTask!.whenComplete(() {});
      final urlDownload = await imageUrl.ref.getDownloadURL();
      print('firebase image =$urlDownload');

      setState(() {
        postfileController.text = urlDownload;
      });
    }catch(e){
    ScaffoldMessenger.of(context).showSnackBar(
    const SnackBar(
    content: Text(
    'check your details /network, and try again',
    ),
    ),
    );
    }
  }


//here i was posting the content
  Future<void> postMessage() async {

    if (postController.text.isNotEmpty && posttitleController.text.isNotEmpty) {
      String message = postController.text;
      String title = posttitleController.text;
      String fileurl=postfileController.text;
      database.addPosts(message, title,fileurl);
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(
          content: Text(
            'Post is succesfully created..',
          ),
        ),
      );
    } else {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(
          content: Text(
            'please enter some text',
          ),
        ),
      );
    }
    postController.clear();
    posttitleController.clear();

  }

  @override
  void dispose() {
    postController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    //String? mimeStr = lookupMimeType(pickedFile!.path!);
    //var fileType = mimeStr?.split('/');
    //print('file type ${fileType}');
    return Scaffold(
      backgroundColor: const Color.fromARGB(255, 245, 242, 242),
      appBar: AppBar(
          leading: const Icon(Icons.create,color: Colors.white,size: 32,),
        title: const Text('CREATE A POST',
            style: TextStyle(color: Colors.white, fontWeight: FontWeight.bold)),
        backgroundColor: Colors.deepPurple
      ),
      body: SafeArea(
        child: SingleChildScrollView(
          child: Column(
            children: <Widget>[
              //padding: const EdgeInsets.symmetric(horizontal: 16.0),
              Container(
                margin: const EdgeInsets.all(8.0),
                child: TextField(
                  controller: posttitleController,
                  keyboardType: TextInputType.multiline,
                  textInputAction: TextInputAction.done,
                  maxLines: 2,
                  decoration: const InputDecoration(
                    //labelText: 'Say something to Community ',
                    hintText: 'Title ',
                    //prefixIcon: Icon(Icons.add),
                    border: OutlineInputBorder(),
                    //filled:true,
                  ),
                ),
              ),
              _gap(),
              Container(
                margin: const EdgeInsets.all(8.0),
                child: TextField(
                  controller: postController,
                  keyboardType: TextInputType.multiline,
                  textInputAction: TextInputAction.done,
                  maxLines: 5,
                  decoration: const InputDecoration(
                    //labelText: 'Say something to Community ',
                    hintText: 'Say something to Community ',
                    //prefixIcon: Icon(Icons.add),
                    border: OutlineInputBorder(),
                    //filled:true,
                  ),
                ),
              ),
              _gap(),
              const SizedBox(height: 10),
            // image container if the image is not null
              if (pickedFile != null)
                //if(fileType=='[image, jpeg]')
                Container(
                    alignment: Alignment.center,
                    width: double.infinity,
                    //height: 300,
                    color: Colors.grey[300],
                    child: Image.file(
                      File(pickedFile!.path!),
                      width: double.infinity,
                      fit: BoxFit.cover,
                    )),



              _gap(),
              Container(
                margin: const EdgeInsets.all(8.0),
                child: TextField(
                  controller: postfileController,
                  keyboardType: TextInputType.multiline,
                  textInputAction: TextInputAction.done,
                  readOnly: true,
                  maxLines: 1,
                  decoration: const InputDecoration(
                    //labelText: 'Say something to Community ',
                    hintText: 'File url',
                    //prefixIcon: Icon(Icons.add),
                    border: OutlineInputBorder(),
                    //filled:true,
                  ),
                ),
              ),
              _gap(),
              SizedBox(
                //width: double.infinity,
                child: ElevatedButton(
                  style: ElevatedButton.styleFrom(
                    backgroundColor: Colors.deepPurple,
                    shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(4)),
                  ),
                  onPressed: selectFile,
                  child: const Padding(
                    padding: EdgeInsets.all(10.0),
                    child: Text(
                      'Upload File',
                      style: TextStyle(
                          fontSize: 16,
                          fontWeight: FontWeight.bold,
                          color: Color.fromARGB(255, 246, 244, 244)),
                    ),
                  ),
                ),
              ),
              _gap(),

              SizedBox(
                //width: double.infinity,
                child: ElevatedButton(
                  style: ElevatedButton.styleFrom(
                    backgroundColor: Colors.deepPurple,
                    shape: RoundedRectangleBorder(
                        borderRadius: BorderRadius.circular(4)),
                  ),
                  onPressed: postMessage,
                  child: const Padding(
                    padding: EdgeInsets.all(10.0),
                    child: Text(
                      'Post',
                      style: TextStyle(
                          fontSize: 16,
                          fontWeight: FontWeight.bold,
                          color: Color.fromARGB(255, 248, 247, 247)),
                    ),
                  ),
                ),
              ),
              _gap(),
            ],
          ),
        ),
      ),
    );
  }



  Widget _gap() => const SizedBox(height: 16);
}