﻿// Copyright 2013 Serilog Contributors
// 
// 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 Serilog.Core;
using Serilog.Debugging;
using Serilog.Events;
using Serilog.Parsing;

namespace Serilog.Parameters
{
    partial class PropertyValueConverter
    {
        class DepthLimiter : ILogEventPropertyValueFactory
        {
            const int MaximumDestructuringDepth = 10;

            readonly int _currentDepth;
            readonly PropertyValueConverter _propertyValueConverter;

            public DepthLimiter(int currentDepth, PropertyValueConverter propertyValueConverter)
            {
                _currentDepth = currentDepth;
                _propertyValueConverter = propertyValueConverter;
            }

            public LogEventPropertyValue CreatePropertyValue(object value, Destructuring destructuring)
            {
                return DefaultIfMaximumDepth() ??
                    _propertyValueConverter.CreatePropertyValue(value, destructuring, _currentDepth + 1);
            }

            public LogEventPropertyValue CreatePropertyValue(object value, bool destructureObjects = false)
            {
                return DefaultIfMaximumDepth() ??
                    _propertyValueConverter.CreatePropertyValue(value, destructureObjects, _currentDepth + 1);
            }

            LogEventPropertyValue DefaultIfMaximumDepth()
            {
                if (_currentDepth == MaximumDestructuringDepth)
                {
                    SelfLog.WriteLine("Maximium destructuring depth reached.");
                    return new ScalarValue(null);
                }

                return null;
            }
        }
    }
}
