using GameHandler.DeathGame;
using GameModel;
using GameModel.DeathGame;
using NuGet.Frameworks;
using NUnit.Framework;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime;
using System.Text;
using System.Threading.Tasks;

namespace GameHandler.UnitTests.DeathGame
{
    [TestFixture]
    public class DeathGameHandlerTests
    {
        private DeathGameSettings _settings;
        private DeathGameHandler _gh;
        private int[] _players;

        [SetUp] 
        public void SetUp() 
        {
            _settings = new DeathGameSettings(6);
            _gh = new DeathGameHandler();
            _players = new[] { 1, 2, 3, 4, 5, 6 };
        }

        [Test]
        public void CreateGameModelWithDuplicatePlayers_ThrowsException()
        {            
            var players = new[] { 1, 2, 3, 1 };
            Assert.That(() => _gh.InitGameModel(players,_settings), Throws.TypeOf<InvalidDataException>());                       
        }

        [Test]
        public void CreateGameModelWithTooManyPlayers_ThrowsException()
        {
            var players = new[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 };
            Assert.That(() => _gh.InitGameModel(players, _settings), Throws.TypeOf<InvalidDataException>());
        }

        [Test]
        public void CreateGameModelWithTooLessPlayers_ThrowsException()
        {
            var players = new[] { 1, 2 };
            Assert.That(() => _gh.InitGameModel(players, _settings), Throws.TypeOf<InvalidDataException>());
        }

        [Test]
        [TestCase(2)]        
        [TestCase(13)]
        public void InvalidMaxCoffinSize_ThrowsException(int maxCoffinSize)
        {
            var players = new[] { 1, 2, 3, 4 };
            var invalidSettings = new DeathGameSettings(maxCoffinSize);
            Assert.That(() => _gh.InitGameModel(players, invalidSettings), Throws.TypeOf<InvalidDataException>());
        }


        [Test]
        public void NewGameModel_IsWithoutXandLineCount()
        {
            var gm = _gh.InitGameModel(_players, _settings);

            Assert.That(gm.Coffins.Count, Is.EqualTo(_players.Count()));
            Assert.That(gm.Coffins.Any(_ => _.XCount > 0), Is.False);
            Assert.That(gm.Coffins.Any(_ => _.LineCount > 0), Is.False);
        }


        [Test]
        public void InvalidFirstThrow_RaisesExpense()
        {
            var gm = _gh.InitGameModel(_players, _settings);
            int failedCoffinPlayerId = 0;
            ExpenseTrigger[] failed = Array.Empty<ExpenseTrigger>();
            _gh.GameExpenseOccured += (sender, arg) =>
            {
                failed = ((GameExenseEventArgs)arg).Triggers;
                failedCoffinPlayerId = ((GameExenseEventArgs)arg).PlayerId;
            };
            var newGm = _gh.CalcNextModel(gm, 2, true, false);

            Assert.That(failedCoffinPlayerId, Is.EqualTo(newGm.Coffins.Last().PlayerId));
        }

        [Test]
        public void ValidFirstThrow_DoesNotRaisesExpense()
        {
            var gm = _gh.InitGameModel(_players, _settings);
            int failedCoffinPlayerId = 0;
            ExpenseTrigger[] failed = Array.Empty<ExpenseTrigger>();
            _gh.GameExpenseOccured += (sender, arg) =>
            {
                failed = ((GameExenseEventArgs)arg).Triggers;
                failedCoffinPlayerId = ((GameExenseEventArgs)arg).PlayerId;
            };
            var newGm = _gh.CalcNextModel(gm, 3, true, false);

            Assert.That(failed, Is.Empty);
            Assert.That(failedCoffinPlayerId, Is.Zero);
        }


        [Test]
        public void AfterFirstThrow_SomeFirstPlayerHasAnX()
        {
            var gm = _gh.InitGameModel(_players, _settings);

            var newGm = _gh.CalcNextModel(gm, 2, true, false);
            Assert.That(newGm.Coffins.Last().XCount, Is.EqualTo(1));
        }

        [Test]
        public void AfterThrowIntoAllPins_SomeFirstPlayerHasAnX()
        {
            var gm = _gh.InitGameModel(_players, _settings);

            var newGm = _gh.CalcNextModel(gm, 2, true, true);
            Assert.That(newGm.Coffins.Last().XCount, Is.EqualTo(1));
        }

        [Test]
        public void AfterThrowWithoutPins_SomeFirstPlayerHasAnLine()
        {
            var gm = _gh.InitGameModel(_players, _settings);

            var newGm = _gh.CalcNextModel(gm, 0, false, false);
            Assert.That(newGm.Coffins.Last().LineCount, Is.EqualTo(1));
            Assert.That(newGm.Coffins.Last().XCount, Is.EqualTo(0));
        }

        [Test]
        public void ThirdX_ChangesToAddedLineAndZeroX()
        {
            var gm = _gh.InitGameModel(_players, _settings);
            var coffins = gm.Coffins.ToList();
            var first = gm.Coffins.First() with { XCount = 2 };
            coffins.RemoveAt(0);
            coffins.Insert(0, first); 
            var gm2 = gm with { Coffins = coffins.ToArray(), Id = 2 };

            var newGm = _gh.CalcNextModel(gm2, 2, true, true);

            Assert.That(newGm.Coffins.Last().XCount, Is.EqualTo(0));
            Assert.That(newGm.Coffins.Last().LineCount, Is.EqualTo(first.LineCount + 2)); // one for third x, one for failed throw
        }

        [Test]
        public void FirstPlayerIsLast_AfterModelUpdate()
        {
            var gm = _gh.InitGameModel(_players, _settings);

            var first = gm.Coffins.First();
            DeathGameModel? newGm = null;

            Assert.That(() => { newGm = _gh.CalcNextModel(gm, 2, false, false); }, Throws.Nothing);

            Assert.That(first.PlayerId,Is.EqualTo(newGm.Coffins.Last().PlayerId));
            Assert.That(gm.Coffins.Count, Is.EqualTo(newGm.Coffins.Count()));
        }

        [Test]
        public void AllPins_CausesLineAtPreviousPlayer()
        {
            var gm = _gh.InitGameModel(_players, _settings);

            var prev = gm.Coffins.Last();
            var newGm = _gh.CalcNextModel(gm, 2, false, true);
            var prevNew = newGm.Coffins.First(_ => _.PlayerId == prev.PlayerId);

            Assert.That(prevNew.LineCount, Is.EqualTo(prev.LineCount + 1));
        }

        [Test]
        public void LineLimit_CausesDeath()
        {
            var gm = _gh.InitGameModel(_players, _settings);
            Coffin? deadCoffin = null;
            _gh.CoffinCompleted += (c) => deadCoffin = c;

            var coffins = gm.Coffins.ToList();
            var first = gm.Coffins.First() with { LineCount = _settings.MaxCoffinSize };
            coffins.RemoveAt(0);
            coffins.Insert(0, first);
            var gm2 = gm with { Coffins = coffins.ToArray(), Id = 2 };

            var newGm = _gh.CalcNextModel(gm2, 0, false, false);



            Assert.That(deadCoffin.PlayerId, Is.EqualTo(first.PlayerId));
            Assert.That(newGm.Coffins.FirstOrDefault(_ => _.PlayerId == deadCoffin.PlayerId), Is.Null);
        }

        [Test]
        public void PreviousPlayerIsDead_WhenCurrentClearsBoard()
        {
            var gm = _gh.InitGameModel(_players, _settings);
            Coffin? deadCoffin = null;
            _gh.CoffinCompleted += (c) => deadCoffin = c;

            var coffins = gm.Coffins.ToList();
            var last = gm.Coffins.Last() with { LineCount = _settings.MaxCoffinSize };
            coffins.RemoveAt(gm.Coffins.Length-1);
            coffins.Insert(gm.Coffins.Length - 1, last);
            var gm2 = gm with { Coffins = coffins.ToArray(), Id = 2 };

            var newGm = _gh.CalcNextModel(gm2, 2, false, true);

            Assert.That(deadCoffin.PlayerId, Is.EqualTo(last.PlayerId));
            Assert.That(newGm.Coffins.FirstOrDefault(_ => _.PlayerId == deadCoffin.PlayerId), Is.Null);
        }

        [Test]
        public void NextPlayerIsDead_WhenCurrentCausesThirdX()
        {
            var gm = _gh.InitGameModel(_players, _settings);
            Coffin? deadCoffin = null;
            _gh.CoffinCompleted += (c) => deadCoffin = c;
            
            var coffins = gm.Coffins.ToList();
            var next = coffins[1] with { XCount = 2, LineCount = _settings.MaxCoffinSize };
            coffins.RemoveAt(1);
            coffins.Insert(1, next);            

            var gm2 = gm with { Coffins = coffins.ToArray(), Id = 2 };

            var newGm = _gh.CalcNextModel(gm2, 2, false, true);

            Assert.That(deadCoffin.PlayerId, Is.EqualTo(next.PlayerId));
            Assert.That(newGm.Coffins.FirstOrDefault(_ => _.PlayerId == deadCoffin.PlayerId), Is.Null);
        }

        [Test]
        public void OnePlayer_CanKillPreviousAndNext()
        {
            var gm = _gh.InitGameModel(_players, _settings);
            var bodies = new List<Coffin>();

            _gh.CoffinCompleted += (c) => bodies.Add(c);


            var coffins = gm.Coffins.ToList();

            var next = coffins[1] with { XCount = 2, LineCount = _settings.MaxCoffinSize };
            coffins.RemoveAt(1);
            coffins.Insert(1, next);

            var last = coffins.Last() with { XCount = 2, LineCount = _settings.MaxCoffinSize };
            coffins.RemoveAt(coffins.Count()-1);
            coffins.Insert(coffins.Count(), last);


            var gm2 = gm with { Coffins = coffins.ToArray(), Id = 2 };

            var newGm = _gh.CalcNextModel(gm2, 2, false, true);

            Assert.That(bodies.Count, Is.EqualTo(2));
            foreach (var body in bodies)
            {
                Assert.That(newGm.Coffins.FirstOrDefault(_ => _.PlayerId == body.PlayerId), Is.Null);
            }
            
        }
    }
}