Error

Error 1010: The agent raised an exception while being evaluated: 'elif' block follows an 'else' block (main.py, line 144)

Traceback:
Traceback (most recent call last):
  File "/sandbox/TEST_RUNNER.py", line 76, in main
    test_results = run_tests()
  File "/sandbox/TEST_RUNNER.py", line 20, in run_tests
    main_spec.loader.exec_module(main_module)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap_external>", line 755, in exec_module
  File "<frozen importlib._bootstrap_external>", line 893, in get_code
  File "<frozen importlib._bootstrap_external>", line 823, in source_to_code
  File "<frozen importlib._bootstrap>", line 491, in _call_with_frames_removed
  File "/sandbox/repo/main.py", line 144
    elif existing_debt > amount:
    ^^^^
SyntaxError: 'elif' block follows an 'else' block

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+import json
 class RestAPI:
     def __init__(self, database: dict | None = None):
+        pass
+        """
+        Initialize the REST API with a database.
+        Args:
+            database: A dictionary representing the initial database state.
+        """
+        self.database = database if database is not None else {"users": []}
     def get(self, url: str, payload: str | None = None) -> str:
+        pass
+        """
+        Handle GET requests to the API.
+        Args:
+            url: The endpoint URL.
+            payload: Optional JSON payload.
+        Returns:
+            A JSON string response.
+        """
+        if url == "/users":
+            if payload is None:
+                # Return all users
+                users = [self._create_user_object(user) for user in self.database["users"]]
+                return json.dumps({"users": users})
+            else:
+                # Return specific users
+                data = json.loads(payload)
+                user_names = data.get("users", [])
+                # Edge Case: Empty user list in payload
+                if not user_names:
+                    return json.dumps({"users": []})
+                # Edge Case: Non-existent users in payload
+                users = []
+                for name in user_names:
+                    user = self._find_user(name)
+                    if user is not None:
+                        users.append(self._create_user_object(user))
+                # Sort users by name
+                users.sort(key=lambda u: u["name"])
+                return json.dumps({"users": users})
+        # Edge Case: Invalid URL
+        return json.dumps({"error": "Invalid URL"})
     def post(self, url: str, payload: str | None = None) -> str:
+        pass
+        """
+        Handle POST requests to the API.
+        Args:
+            url: The endpoint URL.
+            payload: JSON payload.
+        Returns:
+            A JSON string response.
+        """
+        if payload is None:
+            # Edge Case: Missing payload
+            return json.dumps({"error": "Payload required"})
+        data = json.loads(payload)
+        if url == "/add":
+            user_name = data.get("user")
+            # Edge Case: Missing user name
+            if user_name is None:
+                return json.dumps({"error": "User name required"})
+            # Edge Case: User already exists - return existing user
+            if self._find_user(user_name) is not None:
+                existing_user = self._find_user(user_name)
+                return json.dumps(self._create_user_object(existing_user))
+            # Create new user
+            new_user = {
+                "name": user_name,
+                "owes": {},
+                "owed_by": {},
+                "balance": 0.0
+            }
+            self.database["users"].append(new_user)
+            return json.dumps(self._create_user_object(new_user))
+        elif url == "/iou":
+            lender_name = data.get("lender")
+            borrower_name = data.get("borrower")
+            amount = data.get("amount")
+            # Edge Case: Missing required fields
+            if lender_name is None or borrower_name is None or amount is None:
+                return json.dumps({"error": "Lender, borrower, and amount required"})
+            # Edge Case: Lender and borrower are the same
+            if lender_name == borrower_name:
+                return json.dumps({"error": "Lender and borrower cannot be the same"})
+            lender = self._find_user(lender_name)
+            borrower = self._find_user(borrower_name)
+            # Edge Case: Non-existent lender or borrower
+            if lender is None or borrower is None:
+                return json.dumps({"error": "Lender or borrower does not exist"})
+            # Edge Case: Negative amount
+            if amount < 0:
+                return json.dumps({"error": "Amount must be positive"})
+            # Handle IOU creation with proper logic
+            # New IOU: lender lends to borrower, so lender should be owed by borrower
+            # Check if there's already an IOU in the same direction
+            if borrower_name in lender["owed_by"]:
+                # Lender is already owed by borrower - add the amounts
+                lender["owed_by"][borrower_name] += amount
+                borrower["owes"][lender_name] += amount
+            else:
+                # Check if there's already an IOU in the opposite direction
+                if lender_name in borrower["owed_by"]:
+                    # Borrower is already owed by lender - net the amounts
+                    existing_amount = borrower["owed_by"][lender_name]
+                    net_amount = amount - existing_amount
+                    # Remove the old relationship
+                    del borrower["owed_by"][lender_name]
+                    if borrower_name in lender["owes"]:
+                        del lender["owes"][borrower_name]
+                    if net_amount > 0:
+                        # New IOU is larger - lender is now owed by borrower the difference
+                        lender["owed_by"][borrower_name] = net_amount
+                        borrower["owes"][lender_name] = net_amount
+                    elif net_amount < 0:
+                        # Existing IOU was larger - borrower is now owed by lender the difference
+                        borrower["owed_by"][lender_name] = abs(net_amount)
+                        lender["owes"][borrower_name] = abs(net_amount)
+                    # If net_amount == 0, both relationships are removed (zero net debt)
+                else:
+                    # No existing IOU in either direction - create new relationship
+                    lender["owed_by"][borrower_name] = amount
+                    borrower["owes"][lender_name] = amount
+            # Update balances based on the netting logic
+            # Recalculate balances from scratch to ensure accuracy
+            self._recalculate_balance(lender)
+            self._recalculate_balance(borrower)
+            # Return updated user objects
+            users = [
+                self._create_user_object(lender),
+                self._create_user_object(borrower)
+            ]
+            users.sort(key=lambda u: u["name"])
+            return json.dumps({"users": users})
+        # Edge Case: Invalid URL
+        return json.dumps({"error": "Invalid URL"})
+    def _find_user(self, name: str):
+        """
+        Find a user by name in the database.
+        Args:
+            name: The name of the user to find.
+        Returns:
+            The user dictionary if found, None otherwise.
+        """
+        for user in self.database["users"]:
+            if user["name"] == name:
+                return user
+        return None
+    def _recalculate_balance(self, user):
+        """Recalculate a user's balance based on their owes and owed_by relationships."""
+        total_owed_by_others = sum(user["owed_by"].values())
+        total_owed_to_others = sum(user["owes"].values())
+        user["balance"] = total_owed_by_others - total_owed_to_others
+    def _create_user_object(self, user):
+        """
+        Create a user object for API responses.
+        Args:
+            user: The user dictionary from the database.
+        Returns:
+            A user object for API responses.
+        """
+        # Make copies to avoid modifying the original data
+        owes = user["owes"].copy()
+        owed_by = user["owed_by"].copy()
+        balance = round(user["balance"], 2)
+        return {
+            "name": user["name"],
+            "owes": owes,
+            "owed_by": owed_by,
+            "balance": balance
+        }
+    # Handled Edge Cases: Invalid URL, Missing payload, Missing user name, User already exists, Missing required fields, Lender and borrower are the same, Non-existent lender or borrower, Negative amount, Empty user list in payload, Non-existent users in payload