using System.Collections.Concurrent;

using System.Reflection;

using Microsoft.Extensions.Configuration;

namespace ImageApi

{

public static class AppConfigurations

{

private static readonly ConcurrentDictionary<string, IConfigurationRoot> ConfigurationCache;

static AppConfigurations()

{

ConfigurationCache = new ConcurrentDictionary<string, IConfigurationRoot>();

}

public static IConfigurationRoot Get(string path, string environmentName = null, bool addUserSecrets = false)

{

var cacheKey = path + "#" + environmentName + "#" + addUserSecrets;

return ConfigurationCache.GetOrAdd(

cacheKey,

_ => BuildConfiguration(path, environmentName, addUserSecrets)

);

}

private static IConfigurationRoot BuildConfiguration(string path, string environmentName = null,

bool addUserSecrets = false)

{

var builder = new ConfigurationBuilder()

.SetBasePath(path)

.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true);

if (!string.IsNullOrWhiteSpace(environmentName))

{

builder = builder.AddJsonFile($"appsettings.{environmentName}.json", optional: true);

}

builder = builder.AddEnvironmentVariables();

if (addUserSecrets)

{

builder.AddUserSecrets(typeof(AppConfigurations).GetTypeInfo().Assembly);

}

return builder.Build();

}

}

}