done all the implementations of each parts yet

src/main/java/com/pmumali/plr/controllers/GainController.java

@@ -0,0 +1,59 @@
+// com.pmumali.plr.controllers.WinnerController.java
+package com.pmumali.plr.controllers;
+
+import java.util.List;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.pmumali.plr.dtos.GainViewDto;
+import com.pmumali.plr.enums.PariType;
+import com.pmumali.plr.services.GainService;
+
+import io.swagger.v3.oas.annotations.Operation;
+import jakarta.persistence.EntityNotFoundException;
+import lombok.RequiredArgsConstructor;
+
+@RestController
+@RequestMapping("/api/gains")
+@RequiredArgsConstructor
+public class GainController {
+
+    private final GainService winnerService;
+
+    @Operation(summary = "Lister tous les gagnants d'une course (officiels si disponibles, sinon provisoires)")
+    @GetMapping("/course/{courseId}")
+    public ResponseEntity<?> listWinners(@PathVariable Long courseId) {
+        try {
+            List<GainViewDto> winners = winnerService.listWinners(courseId);
+            return ResponseEntity.ok(winners);
+        } catch (EntityNotFoundException e) {
+            return ResponseEntity.status(404).body(java.util.Map.of("error", e.getMessage()));
+        }
+    }
+
+    @Operation(summary = "Lister les gagnants d'une course pour un type de pari")
+    @GetMapping("/course/{courseId}/type/{pariType}")
+    public ResponseEntity<?> listWinnersByType(@PathVariable Long courseId, @PathVariable PariType pariType) {
+        try {
+            List<GainViewDto> winners = winnerService.listWinnersByType(courseId, pariType);
+            return ResponseEntity.ok(winners);
+        } catch (EntityNotFoundException e) {
+            return ResponseEntity.status(404).body(java.util.Map.of("error", e.getMessage()));
+        }
+    }
+
+    @Operation(summary = "Savoir si un pari est gagnant (officiel si disponible, sinon provisoire)")
+    @GetMapping("/pari/{pariId}")
+    public ResponseEntity<?> isWinner(@PathVariable Long pariId) {
+        try {
+            GainViewDto view = winnerService.isWinner(pariId);
+            return ResponseEntity.ok(view);
+        } catch (EntityNotFoundException e) {
+            return ResponseEntity.status(404).body(java.util.Map.of("error", e.getMessage()));
+        }
+    }
+}