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

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 MatchResult UpdateMatchResult(Player p, MatchConditionUpdate args, Dictionary<Player, MatchPlayerStatistic> mps)
		{
			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;
			}
			return DetectMatchResult(mps);
		}

		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>
		/// Detects if a match has concluded.
		/// Currently only checks if all but on player is out.
		/// </summary>
		/// <param name="mps">Dictonary of the players and their match data.</param>
		/// <returns>Match result object, if the match has concluded</returns>
		private static MatchResult DetectMatchResult(Dictionary<Player, MatchPlayerStatistic> mps)
		{
			int outPlayers = mps.Count(p => p.Value.IsOut);
			if (outPlayers == mps.Count - 1)
			{
				return new MatchResult(mps);
			}
			return null;
		}
	}

	/// <summary>
	/// Data class which records the results of a Match
	/// </summary>
	public class MatchResult
	{
		public Player Winner { get; private set; }
		public List<Player> Opponents { get; private set; }
		public GUID GameID { get; private set; }
		public MatchResult(Dictionary<Player, MatchPlayerStatistic> mps)
		{
			GameID = GUID.Generate();
			Winner = mps.First(p => p.Value.IsOut != true).Key;
			Opponents = mps.Keys.Where(player => player != Winner).ToList();
		}
	}
}