using System;
using System.Collections.Generic;

namespace NJDOTNET.Trivia
{
    public abstract class GameServer : IGameServer
    {
        protected GameController controller;
        protected Question currentQuestion;

        protected readonly List<IGameClient> clients = new List<IGameClient>();
        /// <summary>
        /// Gets the currently-connected clients.
        /// </summary>
        /// <value>The currently-connected clients.</value>
        public IEnumerable<IGameClient> Clients
        {
            get { return clients; }
        }

        /// <summary>
        /// Gets the current game client for this request.
        /// </summary>
        /// <value>The current game client.</value>
        public abstract IGameClient GameClient { get; }

        /// <summary>
        /// Create a new game controller.
        /// </summary>
        /// <returns>A new game controller</returns>
        protected abstract GameController CreateNewGameController();

        /// <summary>
        /// Starts the current game!
        /// </summary>
        public virtual void Start()
        {
            // If the game controller hasn't been created,
            // create a new game.
            if (controller == null)
                NewGame();

            // Kick out the jams!
            controller.Start();
        }

        /// <summary>
        /// Create a new game
        /// </summary>
        public virtual void NewGame()
        {
            // Create a new controller for this game
            controller = CreateNewGameController();

            // Wire up controller events
            controller.OnGameStarted += OnGameStarted;
            controller.OnGameEnded += OnGameEnded;
            controller.OnNextQuestion += OnNextQuestion;
        }

        /// <summary>
        /// Registers the player to the current game.
        /// </summary>
        /// <param name="player">The player to register.</param>
        public virtual void RegisterPlayer(Player player)
        {
            var client = GameClient;
            if (!clients.Contains(client))
                clients.Add(client);

            controller.AddPlayer(player);
        }

        /// <summary>
        /// Gets the current question.
        /// </summary>
        /// <returns>The current question</returns>
        public virtual Question GetCurrentQuestion()
        {
            return currentQuestion;
        }

        /// <summary>
        /// Submits an answer.
        /// </summary>
        /// <param name="answer">The answer.</param>
        /// <returns></returns>
        public virtual AnswerSubmissionResponse SubmitAnswer(Answer answer)
        {
            // TODO: Handle QuestionOption submission...
            throw new NotImplementedException();
        }

        protected virtual void OnGameStarted(object sender, EventArgs<Game> e)
        {
            foreach (var client in Clients)
                client.HandleGameStart(e.Value);
        }

        protected virtual void OnGameEnded(object sender, EventArgs<GameSummary> e)
        {
            foreach (var client in Clients)
                client.HandleGameEnd(e.Value);
        }

        protected virtual void OnNextQuestion(object sender, EventArgs<Question> e)
        {
            currentQuestion = e.Value;

            foreach (var client in Clients)
                client.HandleQuestionChanged(currentQuestion);
        }

    }
}