using System.Data;
using System.Text.Json;
using riff;

public class Cube : IRCBot
{
    private HttpClient RequestClient = new();
    private const string AllTriviaQuestionsPath = "data/TriviaQuestions.json";
    private const string UnaskedTriviaQuestionsPath = "data/UnaskedTriviaQuestions.json";
    private TriviaQuestion[] AllTriviaQuestions;
    private List<TriviaQuestion> UnaskedTriviaQuestions;
    private Random Rand = new();

    public Cube(string host, int port, string nick, string realname) : base(host, port, nick, realname)
    {
        AllTriviaQuestions = LoadAllQuestions();
        UnaskedTriviaQuestions = LoadUnaskedQuestions();

        string[] channels = [
            "#testbot",
        ];

        (string, Action<PRIVMSG>)[] commands = [
            ("echo", Echo),
            ("trivia", PostQuestion)
        ];

        HookCommands(commands);
        JoinChannels(channels);
    }

    private void Echo(PRIVMSG privmsg)
    {
        SendPrivmsg(privmsg.Sender, privmsg.Body);
    }

    private void PostQuestion(PRIVMSG privmsg)
    {
        var question = GetQuestion();
        SendPrivmsg(privmsg.Sender, question.Question);
    }

    private TriviaQuestion GetQuestion()
    {
        if (UnaskedTriviaQuestions.Count == 0)
            UnaskedTriviaQuestions = AllTriviaQuestions.ToList();
        TriviaQuestion question = UnaskedTriviaQuestions[Rand.Next(UnaskedTriviaQuestions.Count)];
        UnaskedTriviaQuestions.Remove(question);
        File.WriteAllText(UnaskedTriviaQuestionsPath, JsonSerializer.Serialize(UnaskedTriviaQuestions));
        return question;
    }

    private TriviaQuestion[] LoadAllQuestions()
    {
        try
        {
            using (FileStream stream = File.OpenRead(AllTriviaQuestionsPath))
            {
                TriviaQuestion[] questions = JsonSerializer.Deserialize<TriviaQuestion[]>(stream)!;
                if (questions == null)
                    throw new NoNullAllowedException();
                return questions;
            }
        }
        catch (FileNotFoundException)
        {
            Console.WriteLine("Trivia questions not downloaded. Use download_trivia.py script.");
            Environment.Exit(1);
            return Array.Empty<TriviaQuestion>(); // Unreachable, but required for compiler
        }
    }

    private List<TriviaQuestion> LoadUnaskedQuestions()
    {
        try
        {
            using (FileStream stream = File.OpenRead(UnaskedTriviaQuestionsPath))
            {
                List<TriviaQuestion> questions = JsonSerializer.Deserialize<List<TriviaQuestion>>(stream)!;
                if (questions == null)
                    throw new NoNullAllowedException();
                return questions;
            }
        }
        catch (FileNotFoundException)
        {
            return AllTriviaQuestions.ToList();
        }
    }
}

public class TriviaQuestion
{
    public required string Question { get; set; }
    public required bool Answer { get; set; }
}