using System;

using System.Linq;

using System.Collections.Generic;

using System.Threading.Tasks;

using System.Net.Http;

using Newtonsoft.Json;

​

var client = new HttpClient() { BaseAddress = new Uri("https://api.jsonbin.io/b/5fb62f9404be4f05c9272f9b/2") };

client.DefaultRequestHeaders.Add("secret-key", "$2b$10$FRKBdPsyV27ReVeMpo83U.BYS0Jko5KUjctlj0A865qRkEYVf49ty");

​

var dataService = new DataService(client);

var items = await dataService.GetItemsAsync();

var nodes = items.ToTree();

var display = nodes.MakeFormattedString();

​

Console.WriteLine(display);

​

public static class NeedToImplementThisвыавыавыаыва

{

    // TODO: Need to implement convert flat id-parent list to tree

    public static Node ToTree(this IEnumerable<Item> items) 

        => throw new NotImplementedException();

    // TODO: Make string with nmarkup hierarchy of nodes

    public static string MakeFormattedString(this Node node) 

        => throw new NotImplementedException();

    // output requirements:

    // <ul>

    //      <li>{id}. {text} ({level})</li>

    //      <ul>

    //          <li>{id}. {text} ({level})</li>

    //          ....

    //          <li>{id}. {text} ({level})</li>

    //      </ul>

    // </ul>

}

​

public class Node 

{

    public int Id { get; set; }

    public string Text { get; set; }

    public List<Node> Childs { get; set; }

    public bool IsRoot => Id == 0;

    public bool HasChilds => Childs != null && Childs.Any();

}

​

public class DataService 

{

    private readonly HttpClient _httpClient;

    public DataService(HttpClient httpClient) => _httpClient = httpClient;

    public async Task<IEnumerable<Item>> GetItemsAsync() {

        using var resp = await _httpClient.GetAsync("");

        var json = await resp.Content.ReadAsStringAsync();

​

        Console.WriteLine(json);

        return JsonConvert.DeserializeObject<Item[]>(json);

    }

}

​

public record Item 

{

    public int Id { get; }

    public string Text { get; }

    public int Parent { get; }

}

​

​