import 'dart:io';

import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';
import 'package:logging/logging.dart';
import 'package:path_provider/path_provider.dart';
import 'package:path/path.dart' as path;
import 'package:uuid/uuid.dart';
import 'package:image/image.dart' as img;
import 'package:uuid/v5.dart';

class ImagesManager 
{
    static final ImagesManager instance = ImagesManager._internal();
    ImagesManager._internal();

    static final Logger log = Logger("ImagesManager");

    static Uri? _imagesDirectory;

    Future<Uri> get imageDirectory async
    {
        if(_imagesDirectory != null) return _imagesDirectory!;
        await _initImagesDirectory();
        return _imagesDirectory!;
    }

    Future _initImagesDirectory() async
    {
        final directoryLoc = await getApplicationDocumentsDirectory();
        final directoryName = "images";
        final directoryPath = path.join(directoryLoc.path, directoryName);
        final directoryUri = Uri.directory(directoryPath);
        final directory = Directory.fromUri(directoryUri);
        
        if(!await directory.exists())
        {
            log.info("Image directory does not yet extists. Creating it.");
        }

        directory.create(recursive: false);
        
        log.info("Image directory set up at '$directory'");
        
        _imagesDirectory = directoryUri;
    }

    Future<String?> createImage(ImageSource source) async
    {
        // Get image from camera or not
        final XFile? ximage = await ImagePicker().pickImage(source: source);
        if(ximage == null) return null;

        final uuid = Uuid().v6();
        final imageDir = await imageDirectory;
        ximage.saveTo(path.join(imageDir.path, uuid + path.extension(ximage.name)));
        return uuid;
    }

    Future<Image?> loadImage(String imageUuid) async
    {
        final imageDir = await imageDirectory;
        if(!Uuid.isValidUUID(fromString: imageUuid))
        {
            log.warning("Tried to load an image with an invalid UUID : '$imageUuid'.");
            return null;
        }

        final imagePath = path.join(imageDir.path, "$imageUuid.jpg");
        final file = File(imagePath);
        if(!await file.exists())
        {
            log.warning("Tried to load an image that does not extist: '$imagePath'.");
            return null;
        }

        return Image.file(file);
    }
}