Checkpoint: works first try with endpoint

Signed-off-by: Marcin Woźniak <y0rune@aol.com>

restservice/src/main/java/com/plannaplan/controllers/ExchangeController.java

@@ -5,10 +5,16 @@ import java.util.Optional;
 
 import com.plannaplan.App;
 import com.plannaplan.entities.Assignment;
+import com.plannaplan.entities.Exchange;
 import com.plannaplan.entities.Groups;
 import com.plannaplan.entities.User;
 import com.plannaplan.repositories.ExchangeRepository;
+import com.plannaplan.services.AssignmentService;
+import com.plannaplan.services.ExchangeService;
+import com.plannaplan.services.GroupService;
+import com.plannaplan.services.UserService;
 
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.CrossOrigin;
@@ -25,18 +31,41 @@ import io.swagger.annotations.ApiOperation;
 @RequestMapping("/api/" + App.API_VERSION + "/exchanges")
 @Api(tags = { "Exchange" }, value = "Exchange", description = "Endpoint to exchange with accepted assignments.")
 public class ExchangeController {
+  
+    @Autowired
+    private UserService userService;
+
+    @Autowired
+    private GroupService groupService;
+
+    @Autowired
+    private AssignmentService assignmentService;
     
+    @Autowired
+    private ExchangeService exchangeService;
+
     @PostMapping("/exchange")
     @ApiOperation(value = "Return all courses")
     public ResponseEntity<String> createExchange(@RequestBody Map<String, Long> exchangeRequest){
-        Long user = exchangeRequest.get("user");
-        Long assignment = exchangeRequest.get("assignment");
-        Long group = exchangeRequest.get("group");
 
-        if(user == null || assignment == null|| group == null ){
-            return new ResponseEntity<>("Some of provided value missing", HttpStatus.BAD_REQUEST);
+        final Long userId = exchangeRequest.get("user");
+        final Long assignmentId = exchangeRequest.get("assignment");
+        final Long groupId = exchangeRequest.get("group");
+
+        if(userId == null || assignmentId == null|| groupId == null ){
+            return new ResponseEntity<>("Some of values are missing", HttpStatus.BAD_REQUEST);
         }
 
+        final Optional<User> user = this.userService.getById(userId);
+        final Optional<Assignment> assignment = this.assignmentService.getById(assignmentId);
+        final Optional<Groups> group = this.groupService.getGroupById(groupId);
+        
+        if(user.isEmpty() || assignment.isEmpty() || group.isEmpty()){
+            return new ResponseEntity<>("Some of provided value does not exist.", HttpStatus.BAD_REQUEST);
+        }
+
+        this.exchangeService.save(new Exchange(user.get(), assignment.get(), group.get()));
+
         //System.out.println("KUPA");
 
         return null;