feat: finished new logging feature

lib/core/logging/cubit/app_logs_cubit.dart

@@ -0,0 +1,111 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:bloc/bloc.dart';
+import 'package:collection/collection.dart';
+import 'package:file_picker/file_picker.dart';
+import 'package:flutter/services.dart';
+import 'package:intl/intl.dart';
+import 'package:paperless_mobile/core/logging/models/parsed_log_message.dart';
+import 'package:paperless_mobile/core/service/file_service.dart';
+import 'package:path/path.dart' as p;
+import 'package:rxdart/rxdart.dart';
+part 'app_logs_state.dart';
+
+final _fileNameFormat = DateFormat("yyyy-MM-dd");
+
+class AppLogsCubit extends Cubit<AppLogsState> {
+  StreamSubscription? _fileChangesSubscription;
+  AppLogsCubit(DateTime date) : super(AppLogsStateInitial(date: date));
+
+  Future<void> loadLogs(DateTime date) async {
+    if (date == state.date) {
+      return;
+    }
+    _fileChangesSubscription?.cancel();
+    emit(AppLogsStateLoading(date: date));
+    final logDir = FileService.instance.logDirectory;
+    final availableLogs = (await logDir
+            .list()
+            .whereType<File>()
+            .where((event) => event.path.endsWith('.log'))
+            .map((e) =>
+                _fileNameFormat.parse(p.basenameWithoutExtension(e.path)))
+            .toList())
+        .sorted();
+    final logFile = _getLogfile(date);
+    if (!await logFile.exists()) {
+      emit(AppLogsStateLoaded(
+        date: date,
+        logs: [],
+        availableLogs: availableLogs,
+      ));
+    }
+    try {
+      final logs = await logFile.readAsLines();
+      final parsedLogs =
+          ParsedLogMessage.parse(logs.skip(2000).toList()).reversed.toList();
+      _fileChangesSubscription = logFile.watch().listen((event) async {
+        if (!isClosed) {
+          final logs = await logFile.readAsLines();
+          emit(AppLogsStateLoaded(
+            date: date,
+            logs: parsedLogs,
+            availableLogs: availableLogs,
+          ));
+        }
+      });
+      emit(AppLogsStateLoaded(
+        date: date,
+        logs: parsedLogs,
+        availableLogs: availableLogs,
+      ));
+    } catch (e) {
+      emit(AppLogsStateError(
+        error: e,
+        date: date,
+      ));
+    }
+  }
+
+  Future<void> clearLogs(DateTime date) async {
+    final logFile = _getLogfile(date);
+    await logFile.writeAsString('');
+    await loadLogs(date);
+  }
+
+  Future<void> copyToClipboard(DateTime date) async {
+    final file = _getLogfile(date);
+    if (!await file.exists()) {
+      return;
+    }
+    final content = await file.readAsString();
+    Clipboard.setData(ClipboardData(text: content));
+  }
+
+  Future<void> saveLogs(DateTime date, String locale) async {
+    var formattedDate = _fileNameFormat.format(date);
+    final filename = 'paperless_mobile_logs_$formattedDate.log';
+    final parentDir = await FilePicker.platform.getDirectoryPath(
+      dialogTitle: "Save log from ${DateFormat.yMd(locale).format(date)}",
+      initialDirectory: Platform.isAndroid
+          ? FileService.instance.downloadsDirectory.path
+          : null,
+    );
+    final logFile = _getLogfile(date);
+    if (parentDir != null) {
+      await logFile.copy(p.join(parentDir, filename));
+    }
+  }
+
+  File _getLogfile(DateTime date) {
+    return File(p.join(FileService.instance.logDirectory.path,
+        '${_fileNameFormat.format(date)}.log'));
+  }
+
+  @override
+  Future<void> close() {
+    _fileChangesSubscription?.cancel();
+    return super.close();
+  }
+}

lib/core/logging/cubit/app_logs_state.dart

@@ -0,0 +1,33 @@
+part of 'app_logs_cubit.dart';
+
+sealed class AppLogsState {
+  final DateTime date;
+  const AppLogsState({required this.date});
+}
+
+class AppLogsStateInitial extends AppLogsState {
+  const AppLogsStateInitial({required super.date});
+}
+
+class AppLogsStateLoading extends AppLogsState {
+  const AppLogsStateLoading({required super.date});
+}
+
+class AppLogsStateLoaded extends AppLogsState {
+  const AppLogsStateLoaded({
+    required super.date,
+    required this.logs,
+    required this.availableLogs,
+  });
+  final List<DateTime> availableLogs;
+  final List<ParsedLogMessage> logs;
+}
+
+class AppLogsStateError extends AppLogsState {
+  const AppLogsStateError({
+    required this.error,
+    required super.date,
+  });
+
+  final Object error;
+}