Add gps location API file

Frontend/patient_manager/lib/mih_apis/mih_location_api.dart

@@ -0,0 +1,55 @@
+import 'package:flutter/material.dart';
+import 'package:geolocator/geolocator.dart';
+import 'package:patient_manager/mih_components/mih_pop_up_messages/mih_error_message.dart';
+
+class MIHLocationAPI {
+  final LocationSettings locationSettings = const LocationSettings(
+    accuracy: LocationAccuracy.high,
+    distanceFilter: 100,
+  );
+
+  ///This function is to get the current location of the signed in user.
+  ///First checks the permission, if permission is denied (new user), request permission from user.
+  ///if user has blocked permission (denied or denied forver), user will get error pop up.
+  ///if user has granted permission (while in use), function will return Position object.
+  Future<Position?> getGPSPosition(BuildContext context) async {
+    //Check the type of permission granted
+    LocationPermission permission = await Geolocator.checkPermission();
+    if (permission == LocationPermission.denied) {
+      //First time user (auto denied pernission) request permission from user
+      permission = await Geolocator.requestPermission();
+      if (permission == LocationPermission.denied) {
+        //User denied permission
+        showPermissionError(context);
+        return null;
+      } else if (permission == LocationPermission.deniedForever) {
+        //User denied permission Forever
+        showPermissionError(context);
+        return null;
+      }
+    } else if (permission == LocationPermission.deniedForever) {
+      showPermissionError(context);
+      return null;
+    } else {
+      Position location = await Geolocator.getCurrentPosition(
+          locationSettings: locationSettings);
+      //print(location);
+      return location;
+    }
+    return null;
+  }
+
+  double getDistanceInMeaters(Position startPosition, Position endPosition) {
+    return Geolocator.distanceBetween(startPosition.latitude,
+        startPosition.longitude, endPosition.latitude, endPosition.longitude);
+  }
+
+  void showPermissionError(BuildContext context) {
+    showDialog(
+      context: context,
+      builder: (context) {
+        return const MIHErrorMessage(errorType: "Location Denied");
+      },
+    );
+  }
+}