using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Net;
using System.Text;
using System.Windows.Forms;
using Newtonsoft.Json;
using Timer = System.Timers.Timer;

public static class EnumerableExtension
{
    public static T PickRandom<T>(this IEnumerable<T> source)
    {
        return source.PickRandom(1).Single();
    }

    public static IEnumerable<T> PickRandom<T>(this IEnumerable<T> source, int count)
    {
        return source.Shuffle().Take(count);
    }

    public static IEnumerable<T> Shuffle<T>(this IEnumerable<T> source)
    {
        return source.OrderBy(x => Guid.NewGuid());
    }
}

namespace FourChanMemeSearch
{
    internal static class Program
    {
        private static string retrieve_board_json(string board)
        {
            return new WebClient().DownloadString($"https://a.4cdn.org/{board}/catalog.json");
        }

        private static readonly List<string> SeenThreads = new List<string>();

        private static void Scanner()
        {
            var json = retrieve_board_json(board);
            var pages = JsonConvert.DeserializeObject<dynamic>(json);

            foreach (var page in pages)
            {
                dynamic ind = page.threads;
                foreach (var thread in ind)
                {
                    dynamic number1 = thread.no;
                    var number = (string) number1;
                    if (thread.sub == null) continue;
                    if (SeenThreads.Contains(number))
                        continue;

                    dynamic sub = thread.sub.ToString();

                    string subject = sub.ToString();
                    subject = subject.ToLower();

                    SeenThreads.Add(number);

                    if (SeenThreads.Count >= 1000)
                        SeenThreads.RemoveRange(0, 100);

                    Console.ForegroundColor = ConsoleColor.DarkYellow;

                    Console.Write($"{SeenThreads.IndexOf(number)}");
                    Console.ForegroundColor = ConsoleColor.White;
                    Console.Write("//");
                    Console.ForegroundColor = ConsoleColor.DarkGreen;


                    Console.Write($"{WebUtility.HtmlDecode(sub)}{Environment.NewLine}");

                    if (!subject.Contains(search)) continue;
                    lock (threadList)
                    {
                        if (threadList.Contains(number)) return;
                        threadList.Add(number);
                    }
                    Process.Start($"https://boards.4chan.org/{board}/thread/{number}");
                }
            }
        }

        private static string board;
        private static string search;
        private static readonly List<string> threadList = new List<string>();

        private static readonly List<string> RandomTitles = new List<string>
        {
            "THE GOYIM KNOW",
            "WE WUZ SEARCHINS",
            "SKYKANGZ SKYKANGZ DO NOT SEARCH",
            "Black Lives Splatter",
            "Moonman Moonman",
            "beep boop im a bot poster",
            "we lost to DRRRRRRUMPFIEKINS? ;_;",
            "Hillary did 9/11",
            "Soros is behind feminism",
            "Post No. 11111111111",
            "Praise kek",
            "Catalog sux",
            "Tfw too intelligent to use catalog",
            "Corrupt The Record"
        };

        private static void Main()
        {
            var scanner = new Timer(7777) {AutoReset = true};
            Console.Title = RandomTitles.PickRandom();
            Console.WriteLine(Environment.NewLine);
            Console.ForegroundColor = ConsoleColor.DarkGreen;
            Console.OutputEncoding = Encoding.Unicode;
            Console.WriteLine($"Defaults to /pol/ and Trump General{Environment.NewLine}");

            Console.WriteLine($"Select board: (Shortname) {Environment.NewLine}");
            Console.ForegroundColor = ConsoleColor.DarkRed;

            try
            {
                board = Console.ReadLine().Trim().ToLower();
            }
            catch
            {
                // ignored
            }

            if (string.IsNullOrEmpty(board))
                board = "pol";

            Console.ForegroundColor = ConsoleColor.DarkGreen;

            Console.ForegroundColor = ConsoleColor.Blue;
            Console.WriteLine($"Enter search parameters: {Environment.NewLine}");
            Console.ForegroundColor = ConsoleColor.DarkRed;

            try
            {
                search = Console.ReadLine().Trim().ToLower();
            }
            catch
            {
                // ignored
            }

            if (string.IsNullOrEmpty(search))
                search = "trump general";

            Console.ForegroundColor = ConsoleColor.White;
            Console.WriteLine(Environment.NewLine);

            scanner.Elapsed += delegate { Scanner(); };

            scanner.Enabled = true;
            Console.WriteLine("Enter a number from the index displayed to the left and the thread will open in your browser!");

            while (true)
            {
                var input = string.Empty;

                try
                {
                    input = Console.ReadLine().Trim().ToLower();
                }
                catch
                {
                    // ignored
                }

                int number;
                if (string.IsNullOrEmpty(input)) continue;
                if (int.TryParse(input, out number))
                {
                    if (number < -1 || number >= SeenThreads.Count)
                    {
                        Console.WriteLine($"{number} was out of range {SeenThreads.Count - 1}!");
                        continue;
                    }
                    var test = SeenThreads[number];

                    if (!string.IsNullOrEmpty(test))
                        Process.Start($"https://boards.4chan.org/{board}/thread/{test}");
                    else
                        Console.WriteLine($"Did not find index {number}");
                }
                else
                {
                    Console.WriteLine($"Guessing you meant to change your search to {input}! Searching now...");
                    search = input;
                }
            }

            Application.Run();
        }
    }
}