Update error status from 500 to 404 for commit info retrieval

Changed the HTTP response code and description for cases where commit info is absent, aligning with proper REST conventions. Updated tests, API documentation, and removed unused constant `INTERNAL_SERVER_ERROR` accordingly.

core/src/main/java/greencity/constant/HttpStatuses.java

@@ -12,5 +12,4 @@ public class HttpStatuses {
     public static final String NOT_FOUND = "Not Found";
     public static final String SEE_OTHER = "See Other";
     public static final String FOUND = "Found";
-    public static final String INTERNAL_SERVER_ERROR = "Internal Server Error";
 }

core/src/main/java/greencity/controller/CommitInfoController.java

@@ -9,6 +9,7 @@
 import io.swagger.v3.oas.annotations.media.ExampleObject;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
@@ -41,20 +42,20 @@ public class CommitInfoController {
                         "commitDate": "16/12/2024 10:55:00"
                     }""")))
     @ApiResponse(
-        responseCode = "500",
-        description = HttpStatuses.INTERNAL_SERVER_ERROR,
+        responseCode = "404",
+        description = HttpStatuses.NOT_FOUND,
         content = @Content(
             mediaType = "application/json",
             examples = @ExampleObject(
                 value = """
                     {
-                        "error": "Failed to fetch commit info: Repository not found"
+                        "error": "Git repository not initialized. Commit info is unavailable."
                     }""")))
     @GetMapping
     public ResponseEntity<CommitInfoDto> getCommitInfo() {
         CommitInfoDto commitInfo = commitInfoService.getLatestCommitInfo();
         if (commitInfo instanceof CommitInfoErrorDto) {
-            return ResponseEntity.internalServerError().body(commitInfo);
+            return ResponseEntity.status(HttpStatus.NOT_FOUND).body(commitInfo);
         }
         return ResponseEntity.ok(commitInfo);
     }

core/src/test/java/greencity/controller/CommitInfoControllerTest.java

@@ -61,7 +61,7 @@ void getCommitInfoReturnsErrorTest() throws Exception {
         when(commitInfoService.getLatestCommitInfo()).thenReturn(commitInfoDto);
 
         mockMvc.perform(get(COMMIT_INFO_URL).accept(MediaType.APPLICATION_JSON))
-            .andExpect(status().isInternalServerError())
+            .andExpect(status().isNotFound())
             .andExpect(jsonPath("$.error").value(ERROR_MESSAGE));
 
         verify(commitInfoService, times(1)).getLatestCommitInfo();