using Microsoft.EntityFrameworkCore;
using System.Collections.Generic;
using System.Data;
using System.Text.Json;
using riff;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

public class MysteriousCube : IRCBot
{
    // private HttpClient RequestClient = new();
    private TriviaQuestion[] AllTriviaQuestions;
    private const string AllTriviaQuestionsPath = "data/TriviaQuestions.json";
    private Dictionary<string, TriviaQuestion?> CurrentQuestions = [];
    private readonly Random Rand = new();

    public MysteriousCube(string host, int port, string nick, string realname, List<string> permanentChannels)
        : base(host, port, nick, realname, permanentChannels)
    {
        AllTriviaQuestions = LoadAllQuestions();

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

        Action<PRIVMSG>[] listeners = [
            AnswerListener
        ];

        HookCommands(commands);
        HookListeners(listeners);
    }

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

    private void PostQuestion(PRIVMSG privmsg)
    {
        var question = GetQuestion();
        CurrentQuestions[privmsg.Sender] = question;
        SendPrivmsg(privmsg.Sender, $"Answer 'true' or 'false': {question.Question}");
    }

    private void AnswerListener(PRIVMSG privmsg)
    {
        TriviaQuestion? currentQuestion = CurrentQuestions.GetValueOrDefault(privmsg.Sender);
        if (currentQuestion == null)
            return;
        string line = privmsg.Body.ToLower().Trim();
        bool? answer;
        if (line.StartsWith("true"))
            answer = true;
        else if (line.StartsWith("false"))
            answer = false;
        else
            return;
        string response;
        using (var db = new MysteriousCubeDatabaseContext())
        {
            bool correct = answer == currentQuestion.Answer;
            var user = db.Users.Find(privmsg.Nick);
            if (user == null)
            {
                user = new User { Nick = privmsg.Nick, TriviaScore = 0 };
                db.Users.Add(user);
                db.SaveChanges();
                user = db.Users.Find(privmsg.Nick)!;
            }
            if (correct)
                user.TriviaScore += 1;
            else
                user.TriviaScore =- 1;
            db.Users.Update(user);
            db.SaveChanges();
            string phrasing = correct ? "correct" : "wrong";
            response = $"{privmsg.Nick} is {phrasing}! {privmsg.Nick} has a score of {user.TriviaScore}.";
            CurrentQuestions[privmsg.Sender] = null;
        }
        SendPrivmsg(privmsg.Sender, response);
    }

    private TriviaQuestion GetQuestion()
    {
        using (var db = new MysteriousCubeDatabaseContext())
        {
            var questions = db.UnaskedTriviaQuestions.ToList();
            Console.WriteLine($"{questions.Count}");
            if (db.UnaskedTriviaQuestions.Count() == 0)
            {
                foreach (var q in AllTriviaQuestions)
                    db.UnaskedTriviaQuestions.Add(q);
                questions = db.UnaskedTriviaQuestions.ToList();
            }
            TriviaQuestion question = questions[Rand.Next(questions.Count)];
            db.UnaskedTriviaQuestions.Remove(question);
            db.SaveChanges();
            return question;
        }
    }

    private TriviaQuestion[] LoadAllQuestions()
    {
        try
        {
            using (FileStream stream = File.OpenRead(AllTriviaQuestionsPath))
            {
                var 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
        }
    }

    public class MysteriousCubeDatabaseContext : DbContext
    {
        public DbSet<TriviaQuestion> UnaskedTriviaQuestions { get; set; }
        public DbSet<User> Users { get; set; }
        public string DbPath = "data/mysterious_cube.sqlite";

        // public UnaskedTriviaQuestionsContext()
        // {
        //     //
        // }

        protected override void OnConfiguring(DbContextOptionsBuilder options)
            => options.UseSqlite($"Data Source=data/mysterious_cube.sqlite");
    }

    [Table("UnaskedTriviaQuestions")]
    public class TriviaQuestion
    {
        [Key]
        public required string Question { get; set; }
        public required bool Answer { get; set; }
    }

    [Table("Users")]
    public class User
    {
        [Key]
        public required string Nick { get; set; }
        public required int TriviaScore { get; set; }
    }
}