feat: implement complex selection flow

apps/backend/src/modules/complex/services/complex.service.ts

@@ -104,7 +104,52 @@ export async function listMyComplexes(userId: string) {
     },
   });
 
-  return complexUsers.map((complexUser) => complexUser.complex);
+  return complexUsers.map((complexUser) => ({
+    ...complexUser.complex,
+    role: complexUser.role,
+  }));
+}
+
+export async function getCurrentComplex(userId: string, complexId: string) {
+  const complexUser = await db.complexUser.findUnique({
+    where: {
+      complexId_userId: {
+        complexId,
+        userId,
+      },
+    },
+    include: {
+      complex: true,
+    },
+  });
+
+  if (!complexUser) return null;
+
+  return {
+    ...complexUser.complex,
+    role: complexUser.role,
+  };
+}
+
+export async function selectComplex(userId: string, complexId: string) {
+  const complexUser = await db.complexUser.findUnique({
+    where: {
+      complexId_userId: {
+        complexId,
+        userId,
+      },
+    },
+    include: {
+      complex: true,
+    },
+  });
+
+  if (!complexUser) return null;
+
+  return {
+    ...complexUser.complex,
+    role: complexUser.role,
+  };
 }
 
 export async function updateComplex(id: string, input: UpdateComplexInput) {