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AppSettingsHelper.cs

using System.Text;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using Nop.Core.Infrastructure;

namespace Nop.Core.Configuration;

/// 
/// Represents the app settings helper
/// 
public partial class AppSettingsHelper
{
    #region Fields

    protected static Dictionary _configurationOrder;

    #endregion

    #region Methods

    /// 
    /// Create app settings with the passed configurations and save it to the file
    /// 
    /// Configurations to save
    /// File provider
    /// Whether to overwrite appsettings file
    /// App settings
    public static AppSettings SaveAppSettings(IList configurations, INopFileProvider fileProvider, bool overwrite = true)
    {
        ArgumentNullException.ThrowIfNull(configurations);

        _configurationOrder ??= configurations.ToDictionary(config => config.Name, config => config.GetOrder());

        //create app settings
        var appSettings = Singleton.Instance ?? new AppSettings();
        appSettings.Update(configurations);
        Singleton.Instance = appSettings;

        //create file if not exists
        var filePath = fileProvider.MapPath(NopConfigurationDefaults.AppSettingsFilePath);
        var fileExists = fileProvider.FileExists(filePath);
        fileProvider.CreateFile(filePath);

        //get raw configuration parameters
        var configuration = JsonConvert.DeserializeObject(fileProvider.ReadAllText(filePath, Encoding.UTF8))
                                ?.Configuration
                            ?? new();
        foreach (var config in configurations)
        {
            configuration[config.Name] = JToken.FromObject(config);
        }

        //sort configurations for display by order (e.g. data configuration with 0 will be the first)
        appSettings.Configuration = configuration
            .SelectMany(outConfig => _configurationOrder.Where(inConfig => inConfig.Key == outConfig.Key).DefaultIfEmpty(),
                (outConfig, inConfig) => new { OutConfig = outConfig, InConfig = inConfig })
            .OrderBy(config => config.InConfig.Value)
            .Select(config => config.OutConfig)
            .ToDictionary(config => config.Key, config => config.Value);

        //save app settings to the file
        if (!fileExists || overwrite)
        {
            var text = JsonConvert.SerializeObject(appSettings, Formatting.Indented);
            fileProvider.WriteAllText(filePath, text, Encoding.UTF8);
        }

        return appSettings;
    }

    #endregion
}