add user email

app/routers/users.py

@@ -4,6 +4,7 @@ from ..models import users
 from typing import Annotated
 from bson import ObjectId
 from fastapi.responses import JSONResponse
+from fastapi_mail import  MessageSchema, MessageType
 
 router = APIRouter()
 
@@ -114,8 +115,22 @@ async def read_users_me(userSingle: users.UserCreate | None = None):
             status_code=status.HTTP_400_BAD_REQUEST,
             detail="Body request is empty"
         )
-    fm = FastMail(mail.conf)    
     user_repository = users.UserRepository(database=database.database)
+    user = user_repository.find_one_by({"username": {'$eq': userSingle.username}})
+    if user is not None:
+         raise HTTPException(
+            status_code=status.HTTP_204_NO_CONTENT,
+            detail="User is already exist"
+        )
+
+    fm = FastMail(mail.conf)
+    message = MessageSchema(
+        subject="Fastapi-Mail module",
+        recipients=userSingle.email,
+        template_body=email.dict(),
+        subtype=MessageType.html,
+        )
+    await fm.send_message(message, template_name="mailer.html") 
     current_user = users.User(username=userSingle.username, password=user_token.get_password_hash(userSingle.password), email=userSingle.email)
     user_repository.save(current_user)
     return JSONResponse(status_code=200, content={"message": "email has been sent"})