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filcnaplo/lib/helpers/update_helper.dart

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+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+import 'dart:typed_data';
+
+import 'package:filcnaplo/api/client.dart';
+import 'package:filcnaplo/helpers/storage_helper.dart';
+import 'package:filcnaplo/models/release.dart';
+import 'package:open_file/open_file.dart';
+
+enum UpdateState { prepare, downloading, installing }
+typedef UpdateCallback = Function(double progress, UpdateState state);
+
+extension UpdateHelper on Release {
+  Future<void> install({UpdateCallback? updateCallback}) async {
+    String downloads = await StorageHelper.downloadsPath();
+    File apk = File("$downloads/filcnaplo-${version}.apk");
+
+    if (!await apk.exists()) {
+      updateCallback!(-1, UpdateState.downloading);
+
+      var bytes = await download(updateCallback: updateCallback);
+      if (!await StorageHelper.write(apk.path, bytes)) throw "failed to write apk: permission denied";
+    }
+
+    updateCallback!(-1, UpdateState.installing);
+
+    var result = await OpenFile.open(apk.path);
+
+    if (result.type != ResultType.done) {
+      print("ERROR: installUpdate.openFile: " + result.message);
+      throw result.message;
+    }
+
+    updateCallback(-1, UpdateState.prepare);
+  }
+
+  Future<Uint8List> download({UpdateCallback? updateCallback}) async {
+    var response = await FilcAPI.downloadRelease(this);
+
+    List<List<int>> chunks = [];
+    int downloaded = 0;
+
+    var completer = Completer<Uint8List>();
+
+    response?.stream.listen((List<int> chunk) {
+      updateCallback!(downloaded / (response.contentLength ?? 0), UpdateState.downloading);
+
+      chunks.add(chunk);
+      downloaded += chunk.length;
+    }, onDone: () {
+      // Save the file
+      final Uint8List bytes = Uint8List(response.contentLength ?? 0);
+      int offset = 0;
+      for (List<int> chunk in chunks) {
+        bytes.setRange(offset, offset + chunk.length, chunk);
+        offset += chunk.length;
+      }
+
+      completer.complete(bytes);
+    });
+
+    return completer.future;
+  }
+}