aa/Rename/Models/Binder/AppSettings.cs

using Microsoft.Extensions.Configuration;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace View_by_Distance.Rename.Models.Binder;

public class AppSettings
{

    public string? Company { get; set; }
    public string[]? ConfigurationDirectoryNames { get; set; }
    public string? ConfigurationFileName { get; set; }
    public int? ConfigurationSpecialFolder { get; set; }
    public int? MaxDegreeOfParallelism { get; set; }
    public bool? RequireRootDirectoryExists { get; set; }

    public override string ToString()
    {
        string result = JsonSerializer.Serialize(this, BinderAppSettingsSourceGenerationContext.Default.AppSettings);
        return result;
    }

    private static void PreVerify(IConfigurationRoot configurationRoot, AppSettings? appSettings)
    {
        if (appSettings?.Company is null)
        {
            List<string> paths = [];
            foreach (IConfigurationProvider configurationProvider in configurationRoot.Providers)
            {
                if (configurationProvider is not Microsoft.Extensions.Configuration.Json.JsonConfigurationProvider jsonConfigurationProvider)
                    continue;
                if (jsonConfigurationProvider.Source.FileProvider is not Microsoft.Extensions.FileProviders.PhysicalFileProvider physicalFileProvider)
                    continue;
                paths.Add(physicalFileProvider.Root);
            }
            throw new NotSupportedException($"Not found!{Environment.NewLine}{string.Join(Environment.NewLine, paths.Distinct())}");
        }
    }

    private static void Verify(Models.AppSettings appSettings)
    {
        if (appSettings.MaxDegreeOfParallelism > 1 && (appSettings.RenameConfiguration.InPlaceWithOriginalName || appSettings.RenameConfiguration.InPlace))
            throw new NotSupportedException($"Change configuration: {nameof(appSettings.RenameConfiguration.InPlace)} or {nameof(appSettings.MaxDegreeOfParallelism)}");
        if (appSettings.RenameConfiguration.InPlaceWithOriginalName && appSettings.RenameConfiguration.InPlace)
            throw new NotSupportedException($"Change configuration: {nameof(appSettings.RenameConfiguration.InPlace)} or {nameof(appSettings.RenameConfiguration.InPlaceWithOriginalName)}");
    }

    private static Models.AppSettings Get(AppSettings? appSettings, RenameConfiguration renameConfiguration)
    {
        Models.AppSettings result;
        if (appSettings is null) throw new NullReferenceException(nameof(appSettings));
        if (appSettings.Company is null) throw new NullReferenceException(nameof(appSettings.Company));
        if (appSettings.MaxDegreeOfParallelism is null) throw new NullReferenceException(nameof(appSettings.MaxDegreeOfParallelism));
        if (appSettings.RequireRootDirectoryExists is null) throw new NullReferenceException(nameof(appSettings.RequireRootDirectoryExists));
        result = new(renameConfiguration,
                     appSettings.Company,
                     appSettings.MaxDegreeOfParallelism.Value,
                     appSettings.RequireRootDirectoryExists.Value);
        Verify(result);
        return result;
    }

    private static Models.AppSettings Get(AppSettings? appSettings)
    {
        Models.AppSettings? result;
        string? json;
        if (appSettings is null || appSettings.ConfigurationFileName is null)
            throw new NotSupportedException($"{nameof(appSettings.ConfigurationFileName)} must be set!");
        string jsonFile = Path.Combine(AppContext.BaseDirectory, appSettings.ConfigurationFileName);
        if (File.Exists(jsonFile))
            json = File.ReadAllText(jsonFile);
        else
        {
            json = null;
            string applicationData = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
            List<string> collection = [applicationData];
            if (appSettings?.ConfigurationDirectoryNames is not null)
                collection.AddRange(appSettings.ConfigurationDirectoryNames);
            if (appSettings?.ConfigurationFileName is not null)
                collection.Add(appSettings.ConfigurationFileName);
            jsonFile = Path.Combine(collection.ToArray());
        }
        if (string.IsNullOrEmpty(json) && File.Exists(jsonFile))
            json = File.ReadAllText(jsonFile);
        result = (string.IsNullOrEmpty(json) ? null : result = JsonSerializer.Deserialize(json, AppSettingsSourceGenerationContext.Default.AppSettings)) ??
            throw new NullReferenceException(nameof(Models.AppSettings));
        result = Get(appSettings, result.RenameConfiguration);
        return result;
    }

    public static Models.AppSettings Get(IConfigurationRoot configurationRoot)
    {
        Models.AppSettings result;
#pragma warning disable IL3050, IL2026
        AppSettings? appSettings = configurationRoot.Get<AppSettings>();
#pragma warning restore IL3050, IL2026
        PreVerify(configurationRoot, appSettings);
        result = Get(appSettings);
        return result;
    }

}

[JsonSourceGenerationOptions(WriteIndented = true)]
[JsonSerializable(typeof(AppSettings))]
internal partial class BinderAppSettingsSourceGenerationContext : JsonSerializerContext
{
}