using System;

using System.Linq;

using System.Collections.Generic;

using System.Text.Json;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var permissions = new List<Permission>()

        {

            new(){ ObjectId = "1", ObjectType = "link", Scope = "link:read", AccountId = "1", GroupId = null },

            new(){ ObjectId = "1", ObjectType = "link", Scope = "link:read", AccountId = "2", GroupId = null },

            new(){ ObjectId = "1", ObjectType = "link", Scope = "link:read", AccountId = null, GroupId = "1" },

            new(){ ObjectId = "1", ObjectType = "link", Scope = "link:write", AccountId = "2", GroupId = null },

            new(){ ObjectId = "2", ObjectType = "link", Scope = "link:read", AccountId = "1", GroupId = null },

        };

        var result = permissions.GroupBy(r=> r.ObjectId).Select(r=> new {

            r.Key,

            InnerGroups = r.GroupBy(q=> q.Scope.Replace("link:","")).Select(q=> new {

                Scope = q.Key,

                Accounts =  q.Where(z=> z.AccountId != null).Select(z=> z.AccountId).ToArray(),

                Groups = q.Where(z=> z.GroupId != null).Select(z=> z.GroupId).ToArray()

            })

        })

            .ToDictionary(r=> r.Key,r=> r.InnerGroups.ToDictionary(q=> q.Scope,q=> new {q.Accounts,q.Groups}));

        var serialized = JsonSerializer.Serialize(result,new JsonSerializerOptions{ WriteIndented=true });

        serialized.Dump();

    }

}

​

public class Permission

{

    public string ObjectId { get; set; }

    public string ObjectType { get; set; }

    public string Scope { get; set; }

    public string? AccountId { get; set; }

    public string? GroupId { get; set; }

}

​

​