file-watcher/Helpers/SyncHelper.cs

using File_Watcher.Models;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace File_Watcher.Helpers;

internal static partial class SyncHelper
{

    private record Record(string RelativePath,
                          long Size,
                          long Ticks);

    private record RelativePath(string Path,
                                Record[] Records);

    [JsonSourceGenerationOptions(WriteIndented = true)]
    [JsonSerializable(typeof(RelativePath))]
    private partial class RelativePathSourceGenerationContext : JsonSerializerContext
    {
    }

    [JsonSourceGenerationOptions(WriteIndented = true)]
    [JsonSerializable(typeof(Dictionary<string, object>))]
    private partial class DictionaryStringObjectBSourceGenerationContext : JsonSerializerContext
    {
    }

    internal static bool Check(AppSettings _, ILogger<Worker> __) =>
        true;

    internal static string GetReply(string body, Dictionary<string, object> keyValuePairs)
    {
        string? json;
        RelativePath? relativePath;
        if (!string.IsNullOrEmpty(body) && body[0] == '{')
        {
            File.WriteAllText(".json", body);
            relativePath = JsonSerializer.Deserialize(body, RelativePathSourceGenerationContext.Default.RelativePath) ?? throw new NullReferenceException();
        }
        else
        {
            json = JsonSerializer.Serialize(keyValuePairs, DictionaryStringObjectBSourceGenerationContext.Default.DictionaryStringObject);
            File.WriteAllText(".json", json);
            relativePath = JsonSerializer.Deserialize(json, RelativePathSourceGenerationContext.Default.RelativePath) ?? throw new NullReferenceException();
        }
        if (relativePath is null)
        { }
        return $"wait-{relativePath?.Records.Length}";
    }
}