Changed Graph Tooltip text

lib/Widgets/reading_graph.dart

@@ -46,6 +46,19 @@ class ReadingGraph extends StatelessWidget {
           topTitles: const AxisTitles(sideTitles: SideTitles()),
           rightTitles: const AxisTitles(sideTitles: SideTitles()),
         ),
+        lineTouchData: LineTouchData(
+          touchTooltipData: LineTouchTooltipData(
+            getTooltipItems: (touchedSpots) {
+              return touchedSpots.map((touchedSpot) {
+                return LineTooltipItem(
+                    '${touchedSpot.y.toString()}\n${getLongDate(touchedSpot.x)}',
+                    TextStyle(
+                        color: Theme.of(context).colorScheme.onPrimary,
+                        fontWeight: FontWeight.bold));
+              }).toList();
+            },
+          ),
+        ),
       ),
     );
   }
@@ -85,4 +98,18 @@ class ReadingGraph extends StatelessWidget {
     return hmFormat.format(
         DateTime.fromMillisecondsSinceEpoch((value * 1000 * 60).toInt()));
   }
+
+  String getLongDate(double value) {
+    DateTime date =
+        DateTime.fromMillisecondsSinceEpoch((value * 1000 * 60).toInt());
+    int daysDifference = (DateTime.now().weekday - date.weekday + 7) % 7;
+
+    if (daysDifference == 0) {
+      return 'Today ${intl.DateFormat('Hm').format(date)}';
+    } else if (daysDifference == 1) {
+      return 'Yesterday ${intl.DateFormat('Hm').format(date)}';
+    }
+
+    return intl.DateFormat('yyyy-MM-dd H:m').format(date);
+  }
 }