tablet-app/lib/Services/downloadService.dart

import 'dart:convert';
import 'dart:io';

import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:manager_api/api.dart';
import 'package:provider/provider.dart';
import 'package:tablet_app/Models/tabletContext.dart';
import 'package:tablet_app/app_context.dart';
import 'package:flutter/foundation.dart';
import 'package:http/http.dart' as http;
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:tablet_app/constants.dart';

class DownloadConfigurationWidget extends StatefulWidget {
  DownloadConfigurationWidget();

  @override
  State<DownloadConfigurationWidget> createState() => _DownloadConfigurationWidgetState();
}

class _DownloadConfigurationWidgetState extends State<DownloadConfigurationWidget> {
  ValueNotifier<int> currentResourceIndex = ValueNotifier<int>(0);
  ValueNotifier<int> currentResourceNbr = ValueNotifier<int>(-1);
  bool isAlreadyDownloading = false;

  Future<bool> download(BuildContext buildContext, TabletAppContext tabletAppContext) async {
    bool isAllLanguages = true;

    if(!isAlreadyDownloading) {
      isAlreadyDownloading = true;

      ExportConfigurationDTO? exportConfigurationDTO;
      try{
        // Retrieve all url from resource to download (get all resource from configuration en somme)
        exportConfigurationDTO = await tabletAppContext.clientAPI!.configurationApi!.configurationExport(tabletAppContext.configuration!.id!);
      } catch(e) {
        print("Erreur lors du téléchargement de la configuration et de ses ressources !");
        print(e);
        return false;
      }

      exportConfigurationDTO.resources!.forEach((element) {
        print(element.id);
        print(element.label);
      });

      if(exportConfigurationDTO.resources != null && exportConfigurationDTO.resources!.isNotEmpty) {
        Map<Permission, PermissionStatus> statuses = await [
          Permission.storage,
        ].request();
        //if(statuses[Permission.storage] == PermissionStatus.granted) {
          try{
            try {
              Directory directory = Directory('${tabletAppContext.localPath}');
              List<FileSystemEntity> allConfigurations = directory.listSync();
              Directory configurationDirectory = Directory('${tabletAppContext.localPath}/${tabletAppContext.configuration!.id}');
              if(!allConfigurations.any((configurationDirectory) => configurationDirectory.uri.pathSegments.any((element) => element == tabletAppContext.configuration!.id))) {
                // create directory
                print("Trying to create directory");
                configurationDirectory.createSync(recursive: true);
                print('Répertoire créé avec succès.');
              }
            } catch(e) {
              print("Listing failed, so try to create directory");
              Directory configurationDirectory = Directory('${tabletAppContext.localPath}/${tabletAppContext.configuration!.id}');

              configurationDirectory.createSync(recursive: true);
              print('Répertoire créé avec succès.');
            }

            Directory configurationDirectory = Directory('${tabletAppContext.localPath}/${tabletAppContext.configuration!.id}');
            List<FileSystemEntity> fileList = configurationDirectory.listSync();

            for (var file in fileList) {
              print(file.uri.pathSegments.last);
            }

            var resourcesToDownload = exportConfigurationDTO.resources!.where((resource) => resource.type != ResourceType.ImageUrl && resource.type != ResourceType.VideoUrl && resource.type != ResourceType.JsonUrl && resource.url != null && !fileList.any((fileL) => fileL.uri.pathSegments.last.contains(resource.id!)));

            currentResourceNbr.value = resourcesToDownload.length;

            // foreach ou on va tout télécharger - avec un joli etape 0 / length - on peut rendre tout lent on s'en fou ça ne ce fait qu'une fois
            for (var resource in resourcesToDownload) {
              bool success = await downloadResource(tabletAppContext, resource, tabletAppContext.localPath!);

              if (success) {
                currentResourceIndex.value++;
              } else {
                print("NOT SUCCESSS");
              }
            }

            // Delete others that are no more used
            var resourceToDelete = fileList.where((fileL) =>
              !exportConfigurationDTO!.resources!.any((resource) =>
                resource.id != null && fileL.uri.pathSegments.last.contains(resource.id!)));

            for (var resource in resourceToDelete) {
              print("resource to DELETE");
              print(resource.path);
              // resource.deleteSync();
              // Preserve call to firebase // TODO uncomment if needed
            }

          } catch(e) {
            print("ERRORRRR");
            print(e);

            if(statuses[Permission.storage] != PermissionStatus.granted) {
              Fluttertoast.showToast(
                  msg: "PermissionStatus not granted, issue may be linked to that. Please check os version (if less than 13, real issue).",
                  toastLength: Toast.LENGTH_SHORT,
                  gravity: ToastGravity.BOTTOM,
                  timeInSecForIosWeb: 1,
                  backgroundColor: Colors.redAccent,
                  textColor: Colors.white,
                  fontSize: 16.0
              );
            }
            return false;
          }
        /*} else {
          print("PermissionStatus.granted NOT GRANTED");
          Fluttertoast.showToast(
              msg: "PermissionStatus not granted",
              toastLength: Toast.LENGTH_SHORT,
              gravity: ToastGravity.BOTTOM,
              timeInSecForIosWeb: 1,
              backgroundColor: Colors.redAccent,
              textColor: Colors.white,
              fontSize: 16.0
          );
          return false;
        }*/
      }
    }

    return true;
  }

  @override
  Widget build(BuildContext context) {
    final appContext = Provider.of<AppContext>(context);
    TabletAppContext tabletAppContext = appContext.getContext();
    Size size = MediaQuery.of(context).size;

    return Column(
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      children: [
        Spacer(),
        ValueListenableBuilder<int>(
            valueListenable: currentResourceNbr,
            builder: (context, valueNbr, _) {
              return ValueListenableBuilder<int>(
                  valueListenable: currentResourceIndex,
                  builder: (context, valueIndex, _) {
                    return valueNbr != -1 && valueNbr != 0 ? Center(
                      child: Padding(
                        padding: const EdgeInsets.only(bottom: 8.0),
                        child: Text(
                          "${valueIndex.toString()}/${valueNbr.toString()}",
                          style: TextStyle(fontSize: 45, fontWeight: FontWeight.w500),
                        ),
                      ),
                    ) : SizedBox(height: 0,width: 0);
                  }
              );
            }
        ),
        FutureBuilder(future: download(context, tabletAppContext), builder: (context, snapshot) {
          if (snapshot.connectionState == ConnectionState.waiting) {
            // Loader ou indicateur de chargement pendant la vérification
            Color primaryColor = tabletAppContext.configuration!.primaryColor != null ? new Color(int.parse(tabletAppContext.configuration!.primaryColor!.split('(0x')[1].split(')')[0], radix: 16)) : kTestSecondColor;
            return Center(child: CircularProgressIndicator(color: primaryColor));
          } else {
            return ValueListenableBuilder<int>(
                valueListenable: currentResourceNbr,
                builder: (context, valueNbr, _) {
                  return ValueListenableBuilder<int>(
                      valueListenable: currentResourceIndex,
                      builder: (context, valueIndex, _) {
                        return Center(
                          child: Text(
                            valueIndex == valueNbr && valueNbr != -1 ? valueNbr == 0 ? "Tout est à jour" : "Mise à jour finie" : "Mise à jour en cours",
                            style: TextStyle(fontSize: 25),
                          ),
                        );
                      }
                  );
                }
            );
          }
        }),
        Spacer()
      ],
    );
  }
}

Future<bool> downloadResource(TabletAppContext tabletAppContext, ResourceDTO resourceDTO, String localPath) async {
  try {
    // Téléchargement de la ressource depuis l'URL
    http.Response response = await http.get(Uri.parse(resourceDTO.url!));

    if (response.statusCode == 200) {
      // Vérification de l'en-tête Content-Type
      String contentType = response.headers["content-type"] ?? "";

      // Déduction de l'extension en fonction du Content-Type
      String extension = _getExtensionFromContentType(contentType);

      print("LOCAL PATTH");
      print(localPath);

      File file = File('$localPath/${tabletAppContext.configuration!.id}/${resourceDTO.id}.$extension');

      // Écriture du contenu téléchargé dans le fichier local
      await file.writeAsBytes(response.bodyBytes);

      return true;
    } else {
      print("Échec du téléchargement de la ressource - ${response.statusCode}");
      return false;
    }
  } catch (e) {
    print("Erreur lors du téléchargement de la ressource !");
    print(e);
    return false;
  }
}

String _getExtensionFromContentType(String contentType) {
  Map<String, String> contentTypeToExtension = {
    "image/jpeg": "jpg",
    "image/jpg": "jpg",
    "image/png": "png",
    "image/gif": "gif",
    "audio/mp3": "mp3",
    "video/mp4": "mp4",
    "video/webm": "webm",
    "video/avi": "avi",
    "video/quicktime": "mov",
    "application/pdf": "pdf",
    "application/json": "json"
  };

  return contentTypeToExtension[contentType] ?? "unknown";
}