using System;
using System.Collections.Generic;
using System.Linq;

namespace GameLogic
{
	/// <summary>
	/// Updates and checks a matches rules according to the state of the match.
	/// </summary>
	public static class MatchLogic
	{
		public static MatchRule currentRule;

		/// <summary>
		/// Update match conditions and check for match conclusion.
		/// </summary>
		/// <param name="p">Affected player</param>
		/// <param name="args">Update to the matches conditions</param>
		/// <param name="mps">Dictionary of the players in the match and their current stats</param>
		/// <returns></returns>
		public static void UpdateMatchResult(Player p, MatchConditionUpdate args,
			 Dictionary<Player, MatchPlayerStatistic> mps, GameResult result)
		{
			switch (args.Condition)
			{
				case WinCondition.Lives:
					UpdateLives(mps[p], args.Count);
					break;
				case WinCondition.Score:
					UpdateScore(mps[p], args.Count);
					break;
				case WinCondition.Time:
					UpdateTime(mps[p], args.Count);
					break;
			}
			result.UpdateGameResult(mps, currentRule);
		}

		public static void UpdateLives(MatchPlayerStatistic mps, int count)
		{
			mps.Lives += count;
			if (mps.Lives <= 0)
			{
				mps.IsOut = true;
			}
		}

		public static void UpdateScore(MatchPlayerStatistic mps, int count)
		{
			throw new NotImplementedException();
		}

		public static void UpdateTime(MatchPlayerStatistic mps, int count)
		{
			throw new NotImplementedException();
		}

	}

	/// <summary>
	/// Data class which records the results of a Match
	/// </summary>
	public class GameResult
	{
		/// <summary>
		/// Indicates whether a round or the whole match was won
		/// </summary>
		public bool IsMatchWon { get; private set; }
		public int RoundsPlayed { get; private set; }
		public Player Winner { get; private set; }
		public List<Player> Opponents { get; private set; }

		/// <summary>
		/// Checks whether a round is won and if that round decided the match.
		/// Sets the class properties accordingly.
		/// </summary>
		/// <param name="mps">Dictionary of players with their statistics for this match</param>
		/// <param name="rules">The rules for this match</param>
		public void UpdateGameResult(Dictionary<Player, MatchPlayerStatistic> mps, MatchRule rules)
		{
			int outPlayers = mps.Count(p => p.Value.IsOut);
			// TODO: blatant error here right now
			if (outPlayers == mps.Count - 1)
			{
				Winner = mps.First(p => p.Value.IsOut != true).Key;
				Opponents = mps.Keys.Where(player => player != Winner).ToList();
				mps[Winner].RoundsWon += 1;
				RoundsPlayed += 1;
			}
			else
			{
				Winner = null;
			}
			// TODO: this is wrong winning 2 rounds can decide the match
			if (RoundsPlayed == rules.rounds)
			{
				IsMatchWon = true;
				Winner = mps.Aggregate((p1, p2) =>
					p1.Value.RoundsWon > p2.Value.RoundsWon ? p1 : p2).Key;
				Opponents = mps.Keys.Where(player => player != Winner).ToList();
			}
		}
	}
}