using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;
using System.Security.Cryptography;

namespace QwirkleClassLibrary
{
    public class Game : IPlayer, IRules
    {
        private TileBag bag;
        public bool GameRunning { get; private set; }
        private Board board;

        public ReadOnlyCollection<Player> PlayerList => players.AsReadOnly();
        private readonly List<Player> players = new();

        public ReadOnlyCollection<Score> ScoreList => scores.AsReadOnly();
        private readonly List<Score> scores = new();

        public event EventHandler<AddPlayerNotifiedEventArgs>? PlayerAddNotified;

        protected virtual void OnPlayerNotified(AddPlayerNotifiedEventArgs args)
            => PlayerAddNotified?.Invoke(this, args);

        public event EventHandler<NextPlayerNotifiedEventArgs>? NextPlayerNotified;

        protected virtual void OnNextPlayer(NextPlayerNotifiedEventArgs args)
            => NextPlayerNotified?.Invoke(this, args);

        public Game()
        {
            bag = new TileBag(3);
            board = CreateBoard();

        }

        public bool AddPlayerInGame(string? playerTag)
        {
            if (string.IsNullOrWhiteSpace(playerTag) == true)
            {
                OnPlayerNotified(new AddPlayerNotifiedEventArgs("ERROR : The name is null or white space."));
                return false;
            }

            if(this.GameRunning == true)
            {
                OnPlayerNotified(new AddPlayerNotifiedEventArgs("ERROR : The game is running."));
                return false;
            }

            if (players.Count >= 4)
            {
                OnPlayerNotified(new AddPlayerNotifiedEventArgs("ERROR : The game is full."));
                return false;
            }

            foreach (var p in players)
            {
                if (p.NameTag == playerTag)
                {
                    OnPlayerNotified(new AddPlayerNotifiedEventArgs("ERROR : Name alreay taken"));
                    return false;
                }

            }

            players.Add(CreatePlayer(playerTag));
            scores.Add(new Score(players[players.Count-1]));
            OnPlayerNotified(new AddPlayerNotifiedEventArgs("Player was correctly added"));
            return true;
        }

        public Player CreatePlayer(string playerTag)
        {
            var player = new Player(playerTag);

            return player;
        }

        public Board CreateBoard()
        {
            board = new Board();
            return board;
        }

        public bool StartGame()
        {
            if(players.Count>= 2 && players.Count < 5)
            {
                this.GameRunning = true;
                return true;
            }
            return false;
        }
        
        public Player GetPlayingPlayer()
        {
            if(GetPlayingPlayerPosition() == -1)
            {
                throw new ArgumentException();
            }
            return players[GetPlayingPlayerPosition()];
        }

        public int GetPlayingPlayerPosition()
        {
            for (int i = 0; i < players.Count; i++)
            {
                if (players[i].IsPlaying == true)
                {
                    return i;
                }
            }
            return -1;
        }

        public Tile TileOfPlayerWithPos(int postile)
        {
            return players[GetPlayingPlayerPosition()].Tiles[postile];
        }

        public void GiveTilesToPlayers()
        {
            foreach (var p in players)
            {
                for (int j = 0; j < 6; j++)
                {
                    int val = RandomNumberGenerator.GetInt32(0, bag.TilesBag.Count);

                    p.AddTileToPlayer(bag.TilesBag[val]);
                    bag.RemoveTileInBag(bag.TilesBag[val]);
                }
            }
        }

        public string SetFirstPlayer()
        {
            if (GameRunning == true)
            {
                players[0].IsPlaying = true;
                //OnNextPlayer(new NextPlayerNotifiedEventArgs(players[0]));
                return players[0].NameTag;
            }
            else
            {
                throw new ArgumentException("Game is not running");
            }

        }

        public string SetNextPlayer()
        {
            int i = GetPlayingPlayerPosition();

            if (i == -1)
            {
                return SetFirstPlayer();
            }

            players[i].IsPlaying = false;
            players[(i + 1) % players.Count].IsPlaying = true;
            OnNextPlayer(new NextPlayerNotifiedEventArgs(players[i]));

            return players[GetPlayingPlayerPosition()].NameTag;
        }

        public bool PlaceTile(Player player, Tile tile, int x, int y)
        {
            if (board.AddTileInCell(x, y, tile) == true)
            {
                return player.RemoveTileToPlayer(tile) == true;
            }
            else
            {
                return false;
            }
        }
        
        public bool DrawTiles(Player player)
        {
            while(player.Tiles.Count < 6)
            {
                if (bag.TilesBag.Count == 0)
                {
                    return false;
                }

                int val = RandomNumberGenerator.GetInt32(0, bag.TilesBag.Count + 1);
                
                player.AddTileToPlayer(bag.TilesBag[val]);
                bag.RemoveTileInBag(bag.TilesBag[val]);
            }
            
            return true;
        }

        public bool SwapTiles(Player player, List<Tile> tilesToSwap)
        {
            if (tilesToSwap.Count == 0)
            {
                return false;
            }

            foreach (var t in tilesToSwap)
            {
                if (player.RemoveTileToPlayer(t) == false)
                {
                    return false;
                }
            }

            if (DrawTiles(player) == false)
            {
                return false;
            }

            foreach (var t in tilesToSwap)
            {
                bag.AddTileInBag(t);
            }

            return true;
        }

        public bool IsMoveCorrect(Tile t, Board b)
        {
            return false;
        }

        public bool IsGameOver()
        {
            throw new NotImplementedException();
        }
    }
}