using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.Json;

public class Program

{

    public static void Main()

    {

        var logs = new List<AuditLogDto>

        {

            new AuditLogDto

            {

                Id = "Log 1",

                FilterableProperties = [

                    new AuditLogFilterablePropertyDto { Name = "Brand", Value = "brand 1" },

                    new AuditLogFilterablePropertyDto { Name = "Owner", Value = "owner 1" }

                ]

            },

            new AuditLogDto

            {

                Id = "Log 2",

                FilterableProperties = [

                    new AuditLogFilterablePropertyDto { Name = "Brand", Value = "brand 1" },

                    new AuditLogFilterablePropertyDto { Name = "Owner", Value = "owner 2" }

                ]

            },

            new AuditLogDto

            {

                Id = "Log 3",

                FilterableProperties = [

                    new AuditLogFilterablePropertyDto { Name = "Brand", Value = "brand 2" }

                ]

            },

            new AuditLogDto

            {

                Id = "Log 4",

                FilterableProperties = [

                    new AuditLogFilterablePropertyDto { Name = "Brand", Value = "brand 3" }

                ]

            }

        };

        var allFilterableProperties = logs

            .SelectMany(l => l.FilterableProperties.Select(fp => new { Log = l, FilterableProperty = fp }));

        var logsWithOnlyChanges = allFilterableProperties

            .GroupBy(x => x.FilterableProperty.Value)

            .Select(x => x.First().Log)

            .Distinct();

        Console.WriteLine("Debugging allFilterableProperties...");

        Console.WriteLine(JsonSerializer.Serialize(allFilterableProperties, new JsonSerializerOptions { WriteIndented = true }));

        Console.WriteLine();

        Console.WriteLine("These are the logs with only property value changed:");

        Console.WriteLine(JsonSerializer.Serialize(logsWithOnlyChanges, new JsonSerializerOptions { WriteIndented = true }));

    }

    public record AuditLogFilterablePropertyDto

    {

        public required string Name { get; init; }

        public required string Value { get; init; }

    }

    public record AuditLogDto

    {

        public required string Id { get; init; }

        public IEnumerable<AuditLogFilterablePropertyDto> FilterableProperties { get; init; } = [];

    }

}