// ------------------------------------------------------------------------
// Copyright 2021 The Dapr Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//     http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------

using IDemoActor;

namespace DemoActor
{
    public class BankService
    {
        // Allow overdraft of up to 50 (of whatever currency).
        private readonly decimal OverdraftThreshold = -50m;

        public decimal Withdraw(decimal balance, decimal amount)
        {
            // Imagine putting some complex auditing logic here in addition to the basics.

            var updated = balance - amount;
            if (updated < OverdraftThreshold)
            {
                throw new OverdraftException(balance, amount);
            }

            return updated;
        }
    }
}