using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using log4net;
using PrimeTween;
using UnityEditor;
using UnityEngine;
using GameLogic;
using System.Threading.Tasks;
using System.Linq;

/// <summary>
/// States the match can be in.
/// </summary>
public enum MatchState
{
	CharacterSelect,
	Pause,
	Starting,
	Match,
	End
}

/// <summary>
/// Update data relevant to this matches rules.
/// </summary>
public class MatchConditionUpdate
{
	public WinCondition Condition { get; set; }
	public Ship Ship { get; set; }
	public int Count { get; set; }
}

/// <summary>
/// The properties a player is assigned at the start
/// of the match, according to the rules.
/// </summary>
public class MatchPlayerStatistic
{
	public bool IsOut { get; set; }
	public int RoundsWon { get; set; }
	public int Lives { get; set; }
	public int Score { get; set; }
	public int Time { get; set; }
}

namespace Managers
{
	/// <summary>
	/// Manages the initialization and progression of matches.
	/// </summary>
	public class MatchManager : MonoBehaviour
	{
		private static ILog Log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

		private static readonly string arenaAssetsPath = "Assets/ScriptedAssets/Arenas";
		private static readonly string ruleAssetsPath = "Assets/ScriptedAssets/Rules";
		private static readonly string arenaAssetsBundleName = "arenas";
		private static readonly string ruleAssetsBundleName = "rules";
		private GameResult CurrentMatchResult;

		public GameObject MatchArena;
		public GameObject MatchCamera;
		public SceneEnum MatchScene;

		public event Action OnStartPressed;
		/// <summary>
		/// Globally accessible member to use manager with.
		/// </summary>
		public static MatchManager G { get; private set; }
		/// <summary>
		/// The current state of the match.
		/// </summary>
		public MatchState matchState = MatchState.CharacterSelect;
		/// <summary>
		/// The statistics regarding the current match mapped to the players.
		/// </summary>
		public Dictionary<Player, MatchPlayerStatistic> MatchPlayerStatistics { get; set; } =
			new Dictionary<Player, MatchPlayerStatistic>();
		/// <summary>
		/// Bundle of properties regarding the arena.
		/// </summary>
		public Arena ArenaProperties { get; private set; }
		/// <summary>
		/// The rules under which this match takes place.
		/// </summary>
		public MatchRule MatchRule { get; private set; }
		/// <summary>
		/// List of all the arenas in the assets.
		/// </summary>
		public List<Arena> AvailableArenas { get; private set; } = new List<Arena>();
		/// <summary>
		/// List of all the rules/game modes in the assets.
		/// </summary>
		public List<MatchRule> AvailableRules { get; private set; } = new List<MatchRule>();


		void Awake()
		{
			G = this;
			Log.Info("Awake");
		}

		void Start()
		{
			LoadAvailableRules();
			LoadAvailableArenas();
		}

		/// <summary>
		/// Loads the different rules/game modes from the projects assets.
		/// </summary>
		private void LoadAvailableRules()
		{
#if UNITY_EDITOR
			GameManager.LoadAssetsFromFolder(ruleAssetsPath, AvailableRules);
#else
			GameManager.LoadAssetsFromBundle(ruleAssetsBundleName, AvailableRules);
#endif
		}

		/// <summary>
		/// Loads the characters a player can choose from the projects assets.
		/// </summary>
		private void LoadAvailableArenas()
		{
#if UNITY_EDITOR
			GameManager.LoadAssetsFromFolder(arenaAssetsPath, AvailableArenas);
#else
			GameManager.LoadAssetsFromBundle(arenaAssetsBundleName, AvailableArenas);
#endif
		}


		/// <summary>
		/// Update and check the match conditions in regards to the rules.
		/// </summary>
		/// <param name="update">A change in the matches progression.</param>
		public void UpdateMatchCondition(MatchConditionUpdate update)
		{
			// Quit updating when the round is over
			if (CurrentMatchResult.IsRoundWon)
				return;
			Player updatedPlayer = null;
			foreach (Player p in PlayerManager.G.MatchPlayers)
			{
				if (p.character.shipName == update.Ship.props.shipName)
				{
					updatedPlayer = p;
					Log.Debug($"Players: {p.playerName}'s match statistic will be updated.");
					break;
				}
			}
			if (updatedPlayer == null)
			{
				Log.Error($"Ship: {update.Ship.props.shipName} does not belong to a player in this match."
				+ " Can't update match.");
				return;
			}
			if (CurrentMatchResult == null)
			{
				Log.Error("Match has no result statistics attached and was set up incorrectly!");
				return;
			}
			MatchLogic.UpdateMatchResult(updatedPlayer, update, MatchPlayerStatistics, CurrentMatchResult);
			if (CurrentMatchResult.IsMatchWon)
			{
				Log.Info("Match has ended, winner will be declared.");
				AnnounceMatchWinner(CurrentMatchResult);
				return;
			}
			if (CurrentMatchResult.IsRoundWon)
			{
				Log.Info($"Round {CurrentMatchResult.RoundsPlayed} of {MatchRule.rounds} has ended." +
					$"{CurrentMatchResult.Winner?.playerName} won this round.");
				AnnounceRoundWinner(CurrentMatchResult);
			}
			else
			{
				foreach (var mps in MatchPlayerStatistics)
				{
					if (mps.Value.IsOut)
					{
						MatchCamera.GetComponent<CameraOperator>().RemoveCharacter(mps.Key.spawnedCharacter);
						mps.Key.spawnedCharacter.TryGetComponent(out Ship ship);
						ship.state.IsFrozen = true;
						ship.boostUI.SetIsOut(mps.Key);
					}
				}
			}
		}


		/// <summary>
		/// Creates statistics for the players participating in the match.
		/// </summary>
		public void SetupMatchPlayerStatistics()
		{
			MatchPlayerStatistics.Clear();
			foreach (Player p in PlayerManager.G.MatchPlayers)
			{
				MatchPlayerStatistic mps = new MatchPlayerStatistic
				{
					IsOut = false,
					Lives = MatchRule.lives,
					Score = MatchRule.score,
					Time = MatchRule.time
				};
				if (!MatchPlayerStatistics.TryAdd(p, mps))
				{
					Log.Info($"Player {p.name} already has statistics set up.");
				}
			}
		}

		/// <summary>
		/// Just assigns new arena properties for now.
		/// TODO: Should initiate all the necessary steps upon switching the arena.
		/// </summary>
		/// <param name="arenaIndex">Index of the arena (arenas scripted asset folder order from 0)</param>
		public void LoadArenaProperties(int arenaIndex)
		{
			if (AvailableArenas.Count - 1 < arenaIndex)
			{
				Log.Error($"There are only: {AvailableArenas.Count} arenas loaded."
				+ $" Couldn't load arena number: {arenaIndex + 1}");
				return;
			}
			ArenaProperties = AvailableArenas[arenaIndex];
		}

		/// <summary>
		/// Assigns rules to the match.
		/// </summary>
		/// <param name="ruleIndex">Index of the rule to be loaded 
		/// (rules scripted asset folder order from 0)</param>
		public void LoadMatchRules(int ruleIndex)
		{
			if (AvailableArenas.Count - 1 < ruleIndex)
			{
				Log.Error($"There are only: {AvailableArenas.Count} rules loaded."
				+ $" Couldn't load match rule number: {ruleIndex + 1}");
				return;
			}
			MatchRule = AvailableRules[ruleIndex];
			MatchLogic.currentRule = MatchRule;
		}

		/// <summary>
		/// Just sets the match state for now.
		/// TODO: maybe use in character selection
		/// </summary>
		public void StartCharacterSelect()
		{
			matchState = MatchState.CharacterSelect;
		}

		/// <summary>
		/// Announcement of who won the match.
		/// </summary>
		/// <param name="mr">Result data of the completed match.</param>
		async public void AnnounceMatchWinner(GameResult mr)
		{
			UIManager.G.Announcments.QueueAnnounceText($"{mr.Winner.playerName}" +
				" has won the match!", 2f);
			await Tween.Delay(2f * 0.33f);
			matchState = MatchState.End;
			await Tween.Delay(2f * 0.66f);

			UIManager.G.ShowMatchEndMenu(MatchArena.transform);
			MatchCamera.GetComponent<Camera>().enabled = false;
		}

		async public void StartRematch()
		{
			MatchCamera.GetComponent<Camera>().enabled = true;
			ResetMatch();

			UIManager.G.Announcments.QueueAnnounceText("Starting rematch.", 0.3f);
			UIManager.G.Announcments.QueueAnnounceText("Starting rematch..", 0.3f);
			UIManager.G.Announcments.QueueAnnounceText("Starting rematch...", 0.3f);
			UIManager.G.Announcments.QueueAnnounceText("GO!", 0.5f);
			await Tween.Delay(0.9f);
			matchState = MatchState.Match;
		}

		/// <summary>
		/// Announcement of who won the Round.
		/// </summary>
		/// <param name="mr">Result data of the completed match.</param>
		async public void AnnounceRoundWinner(GameResult mr)
		{
			var winnerStats = MatchPlayerStatistics[mr.Winner];
			// TODO: Confusing
			UIManager.G.Announcments.QueueAnnounceText($"{mr.Winner.playerName}" +
				" has won the Round! \n" +
				$"They won {winnerStats.RoundsWon} rounds \n need {MatchRule.rounds} to win.",
				 3f);

			await Tween.Delay(3f * 0.33f);
			matchState = MatchState.Pause;
			ResetRound();
			await Tween.Delay(3f * 0.66f);

			ResetMatchCharacters();

			UIManager.G.Announcments.QueueAnnounceText("Starting next round.", 0.3f);
			UIManager.G.Announcments.QueueAnnounceText("Starting next round..", 0.3f);
			UIManager.G.Announcments.QueueAnnounceText("Starting next round...", 0.3f);
			UIManager.G.Announcments.QueueAnnounceText("GO!", 0.5f);
			await Tween.Delay(0.9f);

			matchState = MatchState.Match;
		}

		/// <summary>
		/// Resets player positions and statistics.
		/// </summary>
		public void ResetMatch()
		{
			CurrentMatchResult = new GameResult();
			ResetMatchCharacters();
			SetupMatchPlayerStatistics();
		}

		/// <summary>
		/// Resets the round statistics.
		/// </summary>
		public void ResetRound()
		{
			CurrentMatchResult.IsRoundWon = false;
		}

		/// <summary>
		/// Initializes the match, waits for match begin
		/// confirmation by the players and counts down to start.
		/// </summary>
		async public void StartMatch()
		{
			foreach (Player p in PlayerManager.G.MatchPlayers)
			{
				p.spawnedCharacter.transform.localPosition =
					ArenaProperties.spawnPositions[p.playerNumber - 1];
			}
			SetupMatchPlayerStatistics();
			CurrentMatchResult = new GameResult();

			matchState = MatchState.Starting;
			UIManager.G.ShowMatchStartPrompt();

			// Wait until someone pressed start
			var startPressed = new TaskCompletionSource<bool>();
			OnStartPressed += () => ConfirmMatchStart(startPressed);
			// TODO: This could break in WebGL due to threading
			await startPressed.Task;
			OnStartPressed = null;

			UIManager.G.HideAnnouncement();
			UIManager.G.Announcments.QueueAnnounceText("3", 1);
			UIManager.G.Announcments.QueueAnnounceText("2", 1);
			UIManager.G.Announcments.QueueAnnounceText("1", 1);
			UIManager.G.Announcments.QueueAnnounceText("GO!", 0.5f);
			await Tween.Delay(3);

			matchState = MatchState.Match;
		}

		public void StartTestMatch()
		{
			foreach (Player p in PlayerManager.G.MatchPlayers)
			{
				p.spawnedCharacter.transform.localPosition =
					ArenaProperties.spawnPositions[p.playerNumber - 1];
			}
			SetupMatchPlayerStatistics();
			CurrentMatchResult = new GameResult();
			matchState = MatchState.Match;
		}

		public void ConfirmMatchStart(TaskCompletionSource<bool> startPressed)
		{
			startPressed.TrySetResult(true);
		}

		/// <summary>
		/// Is called by the GameplayMetaInputEvents object, when someone pressed start.
		/// </summary>
		public void StartPressed()
		{
			if (matchState != MatchState.Match)
			{
				OnStartPressed?.Invoke();
				return;
			}
		}

		public void PausePressed()
		{
			// TODO: MetaInputEvent in InGameUI scene -> PausePressed here -> ShowPauseMenu in UIManager -> PauseMenu Show
			// When clicking continue in PauseMenu -> PausePressed here -> UIManager HidePause -> PauseMenu Hide 
			if (matchState == MatchState.Pause)
			{
				ContinueMatch();
				UIManager.G.HidePauseMenu();
				MatchCamera.GetComponent<Camera>().enabled = true;
				return;
			}
			if (matchState != MatchState.Match)
			{
				Log.Info("Can only pause when match is in progress.");
				return;
			}
			matchState = MatchState.Pause;
			UIManager.G.ShowPauseMenu(MatchCamera.transform);
			MatchCamera.GetComponent<Camera>().enabled = false;
		}

		async private void ContinueMatch()
		{
			UIManager.G.Announcments.QueueAnnounceText("Get Ready.", 0.3f);
			UIManager.G.Announcments.QueueAnnounceText("Get Ready..", 0.3f);
			UIManager.G.Announcments.QueueAnnounceText("Get Ready...", 0.3f);
			UIManager.G.Announcments.QueueAnnounceText("GO!", 0.5f);
			await Tween.Delay(0.9f);
			matchState = MatchState.Match;
		}

		public void AssignMatchObjects()
		{
			MatchArena = GameObject.Find("Arena Placement");
			MatchCamera = GameObject.Find("Match Camera");
		}

		/// <summary>
		/// Resets the position, rotation and state of the spawned characters.
		/// </summary>
		public void ResetMatchCharacters()
		{
			foreach (Player mp in PlayerManager.G.MatchPlayers)
			{
				GameObject shipGO = mp.spawnedCharacter;
				shipGO.TryGetComponent(out Ship ship);
				shipGO.TryGetComponent(out Rigidbody body);

				ship.boostUI.SetIsIn(mp);
				MatchCamera.GetComponent<CameraOperator>().AddCharacter(shipGO);
				ship.state.IsFrozen = false;

				ship.state.boostCapacity = ship.props.maxBoostCapacity;

				body.velocity = Vector3.zero;

				shipGO.transform.localPosition =
					ArenaProperties.spawnPositions[mp.playerNumber - 1];
				shipGO.transform.rotation = shipGO.transform.parent.rotation;
			}
		}

	}
}