From d47fde67ad93f0e46a42be06235578d0204c8d81 Mon Sep 17 00:00:00 2001
From: kgy1008 <gayeon1008@g.skku.edu>
Date: Tue, 1 Oct 2024 17:32:40 +0900
Subject: [PATCH] [fix] update lowest price

---
 .../api/menu/service/MenuCommandService.java  | 25 +++++++++++++++++--
 .../api/menu/service/MenuFinder.java          |  4 +++
 .../menu/repository/MenuRepository.java       |  1 +
 .../domain/store/model/Store.java             |  4 +++
 4 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/src/main/java/org/hankki/hankkiserver/api/menu/service/MenuCommandService.java b/src/main/java/org/hankki/hankkiserver/api/menu/service/MenuCommandService.java
index 1d6ef8dd..fc48fbeb 100644
--- a/src/main/java/org/hankki/hankkiserver/api/menu/service/MenuCommandService.java
+++ b/src/main/java/org/hankki/hankkiserver/api/menu/service/MenuCommandService.java
@@ -6,6 +6,7 @@
 import org.hankki.hankkiserver.api.menu.service.command.MenuPostCommand;
 import org.hankki.hankkiserver.api.menu.service.response.MenuPostResponse;
 import org.hankki.hankkiserver.api.store.service.StoreFinder;
+import org.hankki.hankkiserver.api.store.service.StoreUpdater;
 import org.hankki.hankkiserver.common.code.MenuErrorCode;
 import org.hankki.hankkiserver.common.exception.ConflictException;
 import org.hankki.hankkiserver.domain.menu.model.Menu;
@@ -21,19 +22,24 @@ public class MenuCommandService {
     private final MenuFinder menuFinder;
     private final MenuUpdater menuUpdater;
     private final StoreFinder storeFinder;
+    private final StoreUpdater storeUpdater;
 
     @Transactional
     public void deleteMenu(final MenuDeleteCommand request) {
+        Store findStore = storeFinder.findByIdWhereDeletedIsFalse(request.storeId());
         Menu findMenu = menuFinder.findById(request.id());
-        validateMenuExistInStore(storeFinder.findByIdWhereDeletedIsFalse(request.storeId()), findMenu);
+        validateMenuExistInStore(findStore, findMenu);
         menuDeleter.deleteMenu(findMenu);
+        updateLowestPriceInStore(findStore);
     }
 
     @Transactional
     public void modifyMenu(final MenuPatchCommand request) {
+        Store findStore = storeFinder.findByIdWhereDeletedIsFalse(request.storeId());
         Menu findMenu  = menuFinder.findById(request.id());
-        validateMenuExistInStore(storeFinder.findByIdWhereDeletedIsFalse(request.storeId()), findMenu);
+        validateMenuExistInStore(findStore, findMenu);
         findMenu.update(request.name(), request.price());
+        updateLowestPriceInStore(findStore);
     }
 
     @Transactional
@@ -42,9 +48,24 @@ public MenuPostResponse createMenu(final MenuPostCommand request) {
         validateConflictMenu(findStore, request.name());
         Menu menu = Menu.create(findStore, request.name(), request.price());
         menuUpdater.save(menu);
+        updateLowestPriceInStore(findStore, menu);
         return MenuPostResponse.of(menu);
     }
 
+    private void updateLowestPriceInStore(final Store store) {
+        int lowestPrice = menuFinder.findByStore(store).stream()
+                .mapToInt(Menu::getPrice)
+                .min()
+                .orElse(0);
+        store.updateLowestPrice(lowestPrice);
+    }
+
+    private void updateLowestPriceInStore(final Store store, final Menu menu) {
+        if (store.getLowestPrice() > menu.getPrice()) {
+            store.updateLowestPrice(menu.getPrice());
+        }
+    }
+
     private void validateMenuExistInStore(final Store store, final Menu menu) {
         menuFinder.findByStoreAndMenu(store, menu);
     }
diff --git a/src/main/java/org/hankki/hankkiserver/api/menu/service/MenuFinder.java b/src/main/java/org/hankki/hankkiserver/api/menu/service/MenuFinder.java
index 9386fc26..5902f9bb 100644
--- a/src/main/java/org/hankki/hankkiserver/api/menu/service/MenuFinder.java
+++ b/src/main/java/org/hankki/hankkiserver/api/menu/service/MenuFinder.java
@@ -26,6 +26,10 @@ protected Menu findById(final Long id) {
         return menuRepository.findById(id).orElseThrow(() -> new NotFoundException(MenuErrorCode.MENU_NOT_FOUND));
     }
 
+    protected List<Menu> findByStore(final Store store) {
+        return menuRepository.findByStoreId(store.getId());
+    }
+
     protected Menu findByStoreAndMenu(final Store store, final Menu menu) {
         return menuRepository.findByStoreAndId(store, menu.getId()).orElseThrow(() -> new BadRequestException(MenuErrorCode.MENU_NOT_FOUND));
     }
diff --git a/src/main/java/org/hankki/hankkiserver/domain/menu/repository/MenuRepository.java b/src/main/java/org/hankki/hankkiserver/domain/menu/repository/MenuRepository.java
index 9f42f050..52889503 100644
--- a/src/main/java/org/hankki/hankkiserver/domain/menu/repository/MenuRepository.java
+++ b/src/main/java/org/hankki/hankkiserver/domain/menu/repository/MenuRepository.java
@@ -11,4 +11,5 @@ public interface MenuRepository extends JpaRepository<Menu, Long> {
     List<Menu> findAllByStore(Store store);
     Optional<Menu> findByStoreAndId(Store store, Long id);
     Optional<Menu> findByStoreAndName(Store store, String name);
+    List<Menu> findByStoreId(long storeId);
 }
diff --git a/src/main/java/org/hankki/hankkiserver/domain/store/model/Store.java b/src/main/java/org/hankki/hankkiserver/domain/store/model/Store.java
index 1dae6986..78345239 100644
--- a/src/main/java/org/hankki/hankkiserver/domain/store/model/Store.java
+++ b/src/main/java/org/hankki/hankkiserver/domain/store/model/Store.java
@@ -83,4 +83,8 @@ public void softDelete() {
     public String getImageUrlOrElseNull() {
         return images.isEmpty() ? null : images.get(0).getImageUrl();
     }
+
+    public void updateLowestPrice(int lowestPrice) {
+        this.lowestPrice = lowestPrice;
+    }
 }