HTTP Azure Function Code which selects N random comments on a Facebook post

run.csx

#r "Newtonsoft.Json"

using System.Net;
using System.Linq;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Primitives;
using Newtonsoft.Json;

public class FacebookPost
{
    public string Id { get; set; }
    public string Message { get; set; }
    public string PermaLink_Url { get; set; }
}

public class Comments
{
    public List<FacebookPost> Data { get; set; }    
}

public static async Task<IActionResult> Run(HttpRequest req, ILogger log)
{
    var url = "this is a hard-coded URL. Get yours from Facebook Graph API :) access-token is needed";

    var winnersCount = 0;
    var random = new Random();
    List<FacebookPost> posts = null;
    var winnersList = new List<FacebookPost>();

    if (int.TryParse(req.Query["winners"], out winnersCount))
    {
        using (var client = new HttpClient())
        {
            var task = await client.GetAsync(url);
            var json = await task.Content.ReadAsStringAsync();
            var comments = JsonConvert.DeserializeObject<Comments>(json);
            posts = comments.Data;
        }

        if (posts != null)
        {
            var postsCount = posts.Count;

            for (int i = 0; i < winnersCount; i++)
            {
                var winner = posts[random.Next(0, postsCount)];
                var search = winnersList.FirstOrDefault(x => x.Id == winner.Id);
                
                if (object.Equals(search, default (FacebookPost)))
                {
                    log.LogInformation($"{winner.Id} won");
                    winnersList.Add(winner);
                }
                else
                {
                    log.LogInformation($"{winner.Id} has already won");
                    i--;
                }
            }
        }
    }

    return (ActionResult)new OkObjectResult(winnersList);
}