﻿// Copyright 2013-2016 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 System;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyModel;
using Serilog.Configuration;
using Serilog.Settings.Configuration;

namespace Serilog
{
    /// <summary>
    /// Extends <see cref="LoggerConfiguration"/> with support for System.Configuration appSettings elements.
    /// </summary>
    public static class ConfigurationLoggerConfigurationExtensions
    {
        const string DefaultSectionName = "Serilog";

        /// <summary>
        /// Reads logger settings from the provided configuration object using the default section name.
        /// </summary>
        /// <param name="settingConfiguration">Logger setting configuration.</param>
        /// <param name="configuration">A configuration object with a Serilog section.</param>
        /// <param name="dependencyContext">The dependency context from which sink/enricher packages can be located. If not supplied, the platform
        /// default will be used.</param>
        /// <returns>An object allowing configuration to continue.</returns>
        public static LoggerConfiguration Configuration(
            this LoggerSettingsConfiguration settingConfiguration,
            IConfiguration configuration,
            DependencyContext dependencyContext = null)
        {
            if (configuration == null) throw new ArgumentNullException(nameof(configuration));
            return settingConfiguration.ConfigurationSection(configuration.GetSection(DefaultSectionName), dependencyContext);
        }

        /// <summary>
        /// Reads logger settings from the provided configuration section.
        /// </summary>
        /// <param name="settingConfiguration">Logger setting configuration.</param>
        /// <param name="configuration">The Serilog configuration section</param>
        /// <param name="dependencyContext">The dependency context from which sink/enricher packages can be located. If not supplied, the platform
        /// default will be used.</param>
        /// <returns>An object allowing configuration to continue.</returns>
        public static LoggerConfiguration ConfigurationSection(
            this LoggerSettingsConfiguration settingConfiguration,
            IConfigurationSection configuration,
            DependencyContext dependencyContext = null)
        {
            if (settingConfiguration == null) throw new ArgumentNullException(nameof(settingConfiguration));
            if (configuration == null) throw new ArgumentNullException(nameof(configuration));

            return settingConfiguration.Settings(new ConfigurationReader(configuration, dependencyContext ?? DependencyContext.Default));
        }
    }
}
