test(points): cover trend endpoint

backend/src/main/java/com/openisle/controller/PointHistoryController.java

@@ -7,9 +7,11 @@ import lombok.RequiredArgsConstructor;
 import org.springframework.security.core.Authentication;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
 import java.util.List;
+import java.util.Map;
 import java.util.stream.Collectors;
 
 @RestController
@@ -25,4 +27,10 @@ public class PointHistoryController {
                 .map(pointHistoryMapper::toDto)
                 .collect(Collectors.toList());
     }
+
+    @GetMapping("/trend")
+    public List<Map<String, Object>> trend(Authentication auth,
+                                          @RequestParam(value = "days", defaultValue = "30") int days) {
+        return pointService.trend(auth.getName(), days);
+    }
 }

backend/src/main/java/com/openisle/repository/PointHistoryRepository.java

@@ -4,9 +4,12 @@ import com.openisle.model.PointHistory;
 import com.openisle.model.User;
 import org.springframework.data.jpa.repository.JpaRepository;
 
+import java.time.LocalDateTime;
 import java.util.List;
 
 public interface PointHistoryRepository extends JpaRepository<PointHistory, Long> {
     List<PointHistory> findByUserOrderByIdDesc(User user);
     long countByUser(User user);
+
+    List<PointHistory> findByUserAndCreatedAtAfterOrderByCreatedAtDesc(User user, LocalDateTime createdAt);
 }

backend/src/main/java/com/openisle/service/PointService.java

@@ -7,6 +7,10 @@ import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
 import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
 
 @Service
 @RequiredArgsConstructor
@@ -173,4 +177,25 @@ public class PointService {
         return pointHistoryRepository.findByUserOrderByIdDesc(user);
     }
 
+    public List<Map<String, Object>> trend(String userName, int days) {
+        if (days < 1) days = 1;
+        User user = userRepository.findByUsername(userName).orElseThrow();
+        LocalDate end = LocalDate.now();
+        LocalDate start = end.minusDays(days - 1L);
+        var histories = pointHistoryRepository.findByUserAndCreatedAtAfterOrderByCreatedAtDesc(
+                user, start.atStartOfDay());
+        int idx = 0;
+        int balance = user.getPoint();
+        List<Map<String, Object>> result = new ArrayList<>();
+        for (LocalDate day = end; !day.isBefore(start); day = day.minusDays(1)) {
+            result.add(Map.of("date", day.toString(), "value", balance));
+            while (idx < histories.size() && histories.get(idx).getCreatedAt().toLocalDate().isEqual(day)) {
+                balance -= histories.get(idx).getAmount();
+                idx++;
+            }
+        }
+        Collections.reverse(result);
+        return result;
+    }
+
 }

backend/src/test/java/com/openisle/controller/PointHistoryControllerTest.java

@@ -0,0 +1,65 @@
+package com.openisle.controller;
+
+import com.openisle.config.CustomAccessDeniedHandler;
+import com.openisle.config.SecurityConfig;
+import com.openisle.service.PointService;
+import com.openisle.mapper.PointHistoryMapper;
+import com.openisle.service.JwtService;
+import com.openisle.repository.UserRepository;
+import com.openisle.model.User;
+import com.openisle.model.Role;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.context.annotation.Import;
+import org.springframework.test.web.servlet.MockMvc;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@WebMvcTest(PointHistoryController.class)
+@AutoConfigureMockMvc
+@Import({SecurityConfig.class, CustomAccessDeniedHandler.class})
+class PointHistoryControllerTest {
+    @Autowired
+    private MockMvc mockMvc;
+
+    @MockBean
+    private JwtService jwtService;
+    @MockBean
+    private UserRepository userRepository;
+    @MockBean
+    private PointService pointService;
+    @MockBean
+    private PointHistoryMapper pointHistoryMapper;
+
+    @Test
+    void trendReturnsSeries() throws Exception {
+        Mockito.when(jwtService.validateAndGetSubject("token")).thenReturn("user");
+        User user = new User();
+        user.setUsername("user");
+        user.setPassword("p");
+        user.setEmail("u@example.com");
+        user.setRole(Role.USER);
+        Mockito.when(userRepository.findByUsername("user")).thenReturn(Optional.of(user));
+        List<Map<String, Object>> data = List.of(
+                Map.of("date", java.time.LocalDate.now().minusDays(1).toString(), "value", 100),
+                Map.of("date", java.time.LocalDate.now().toString(), "value", 110)
+        );
+        Mockito.when(pointService.trend(Mockito.eq("user"), Mockito.anyInt())).thenReturn(data);
+
+        mockMvc.perform(get("/api/point-histories/trend").param("days", "2")
+                        .header("Authorization", "Bearer token"))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$[0].value").value(100))
+                .andExpect(jsonPath("$[1].value").value(110));
+    }
+}