saving and reading

1 files changed, 104 insertions, 0 deletions

diff --git a/lib/services/program_provider_service.dart b/lib/services/program_provider_service.dart
new file mode 100644
index 0000000..375ed8b
--- /dev/null
+++ b/lib/services/program_provider_service.dart
@@ -0,0 +1,104 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:training_planner/services/ishift_provider_service.dart';
+import 'package:training_planner/shift.dart';
+import 'package:uuid/uuid.dart';
+import 'package:in_date_utils/in_date_utils.dart' as DateUtilities;
+import 'package:path_provider/path_provider.dart';
+
+class ShiftProviderService extends IProgramProviderService {
+  ShiftProviderService() {
+    writeShiftsFromFile([]);
+  }
+
+  Future<String> get _localPath async {
+    final directory = await getApplicationDocumentsDirectory();
+    return directory.path;
+  }
+
+  Future<File> get _localFile async {
+    final path = await _localPath;
+    return File('$path/shifts.json');
+  }
+
+  Future<void> writeShiftsFromFile(List<Shift> shifts) async {
+    try {
+      final file = await _localFile;
+      String content = jsonEncode(shifts);
+      await file.writeAsString(content);
+      print('Writing to file: ' + content);
+    } catch (e, stacktrace) {
+      print(stacktrace);
+      print(e);
+    }
+  }
+
+  Future<List<Shift>> readShiftsFromFile() async {
+    try {
+      final file = await _localFile;
+      final contents = await file.readAsString();
+      final Iterable iterable = await jsonDecode(contents);
+      List<Shift> data =
+          List<Shift>.from(iterable.map((model) => Shift.fromJson(model)));
+      print('Read from file: ' + contents);
+
+      return data;
+    } catch (e, stacktrace) {
+      print(stacktrace);
+      print(e);
+      return [];
+    }
+  }
+
+  @override
+  Future<void> updateShift(Shift shift) async {
+    List<Shift> savedShifts = await readShiftsFromFile();
+    for (var item in savedShifts) {
+      if (DateUtilities.DateUtils.isSameDay(shift.start, item.start)) {
+        item.isActive = shift.isActive;
+        item.start = shift.start;
+        item.end = shift.end;
+        item.type = shift.type;
+        break;
+      }
+    }
+    await writeShiftsFromFile(savedShifts);
+  }
+
+  @override
+  Future<void> addShift(Shift shift) async {
+    List<Shift> savedShifts = await readShiftsFromFile();
+    for (var item in savedShifts) {
+      if (DateUtilities.DateUtils.isSameDay(shift.start, item.start)) {
+        return;
+      }
+    }
+
+    savedShifts.add(shift);
+    await writeShiftsFromFile(savedShifts);
+  }
+
+  @override
+  Future<List<Shift>> getPastShifts() async {
+    List<Shift> shifts = await readShiftsFromFile();
+    shifts.sort((a, b) => a.start.compareTo(b.start));
+
+    return shifts;
+  }
+
+  @override
+  Future<List<Shift>> getShiftsForWeek(DateTime firstDayOfWeek) async {
+    var items = await getPastShifts();
+    List<Shift> result = [];
+
+    for (var item in items) {
+      if (DateUtilities.DateUtils.firstDayOfWeek(item.start) ==
+          firstDayOfWeek) {
+        result.add(item);
+      }
+    }
+
+    return result;
+  }
+}