From 04ec8a67987036d0ac6c9b22765eaf445f8cd16c Mon Sep 17 00:00:00 2001
From: hwinkr <dnddl8280@naver.com>
Date: Sat, 27 Jan 2024 22:32:53 +0900
Subject: [PATCH] =?UTF-8?q?Feat(util=20function):=20=EC=82=AC=EC=9A=A9?=
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- 위치 정보를 허용하는지, 사용자가 학교 내부에 있는지 확인하는 함수 구현
---
 src/utils/map/user-location.ts | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 src/utils/map/user-location.ts

diff --git a/src/utils/map/user-location.ts b/src/utils/map/user-location.ts
new file mode 100644
index 00000000..a6682e4f
--- /dev/null
+++ b/src/utils/map/user-location.ts
@@ -0,0 +1,34 @@
+import { NO_PROVIDE_LOCATION, PKNU_MAP_CENTER } from '@constants/pknu-map';
+import { Location } from '@type/map';
+
+const degreeToRadian = (deg: number) => deg * (Math.PI / 180);
+
+const getHaversineDistance = (lat: number, lng: number) => {
+  const R = 6371000;
+
+  const dLat = degreeToRadian(PKNU_MAP_CENTER.LAT - lat);
+  const dLon = degreeToRadian(PKNU_MAP_CENTER.LNG - lng);
+
+  const halfSideLength =
+    Math.sin(dLat / 2) * Math.sin(dLat / 2) +
+    Math.cos(degreeToRadian(PKNU_MAP_CENTER.LAT)) *
+      Math.cos(degreeToRadian(lat)) *
+      Math.sin(dLon / 2) *
+      Math.sin(dLon / 2);
+
+  const angularDistance =
+    2 * Math.atan2(Math.sqrt(halfSideLength), Math.sqrt(1 - halfSideLength));
+
+  return R * angularDistance;
+};
+
+export const hasLocationPermission = (location: Location | null) => {
+  return (
+    location && JSON.stringify(location) !== JSON.stringify(NO_PROVIDE_LOCATION)
+  );
+};
+
+export const isUserInShcool = (lat: number, lng: number) => {
+  const maxDistance = 450;
+  return getHaversineDistance(lat, lng) <= maxDistance;
+};