using ReactiveUI;
using System;
using System.Collections.Generic;
using MeksMathGame.Models;
using System.Reactive.Linq;
using System.Linq;

namespace MeksMathGame.ViewModels;

public class HomeScreenViewModel : ViewModelBase
{
    public string? _information;
    public string? _selectedDiff;
    public string? _maxQues;

    public List<string?>? _difficulties;
    public List<string?>? _numberRange;

    public HomeScreenViewModel()
    {
        List<string> info = new()
        {
            "Welcome to the Math Game! There are 5 buttons on the right side.",
            "To play a game, select a difficulty and the number of questions you",
            "want to answer below, and then click a game button to the right.",
            "To go back to select another user, click the Back button. To view",
            "all the games you've played, click the Previous Games button",
            "\n\nEasy => Number Ranges Between 0 and 300",
            "\nMedium => Number Ranges Between 0 and 600",
            "\nHard => Number Ranges Between 0 and 900"
        };

        Information = string.Join(" ", info);

        Difficulties = new() { "Select One", "Easy", "Medium", "Hard" };

        var numbers = Enumerable.Range(1, 25);
        NumberRange = new() { "Select One" };
        NumberRange.AddRange(numbers.Select(x => x.ToString()));

        SelectedDiff = Difficulties[0];
        MaxQues = NumberRange[0];

        IObservable<bool> numQuesOk = this.WhenAnyValue(
            x => x.MaxQues,
            x => x != "Select One");

        IObservable<bool> diffOk = this.WhenAnyValue(
            x => x.SelectedDiff,
            x => x != "SelectOne");

        IObservable<bool> okEnabled = numQuesOk
            .Concat(diffOk);

        Play = ReactiveCommand.Create<string, Game>(gameType => PlayGame(gameType), okEnabled);
        PreviousGames = ReactiveCommand.Create<string, Game>(gameType => ShowPreviousGames(gameType));
        BackButton = ReactiveCommand.Create<string, Game>(gameType => SendBackButton(gameType));
    }

    public Game PlayGame(string gameType)
    {
        int? totalQues = Convert.ToInt32(MaxQues);

        return new Game
        {
            TotalQuestions = totalQues,
            Difficulty = SelectedDiff,
            GameType = gameType
        };
    }

    public Game ShowPreviousGames(string gameType)
    {
        return new Game { GameType = "Previous Games" };
    }

    public Game SendBackButton(string gameType)
    {
        return new Game { GameType = "Back Button" };
    }

    #region Getters/Setters
    public string? Information
    {
        get => _information;
        set => this.RaiseAndSetIfChanged(ref _information, value);
    }
    public string? SelectedDiff
    {
        get => _selectedDiff;
        set => this.RaiseAndSetIfChanged(ref _selectedDiff, value);
    }
    public string? MaxQues
    {
        get => _maxQues;
        set => this.RaiseAndSetIfChanged(ref _maxQues, value);
    }
    public List<string?>? Difficulties
    {
        get => _difficulties;
        set => this.RaiseAndSetIfChanged(ref _difficulties, value);
    }
    public List<string?>? NumberRange
    {
        get => _numberRange;
        set => this.RaiseAndSetIfChanged(ref _numberRange, value);
    }
    #endregion

    public ReactiveCommand<string, Game> Play { get; }
    public ReactiveCommand<string, Game> PreviousGames { get; }
    public ReactiveCommand<string, Game> BackButton { get; }
}