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;

/// <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 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 string arenaAssetsPath = "Assets/ScriptedAssets/Arenas";
		private static string ruleAssetsPath = "Assets/ScriptedAssets/Rules";

		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 players participating in the match.
		/// </summary>
		public List<Player> matchPlayers { get; private set; } =
			new List<Player>();
		/// <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>
		/// 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)
		{
			Player updatedPlayer = null;
			foreach (Player p in matchPlayers)
			{
				if (p.character.shipName == update.Ship.props.shipName)
				{
					updatedPlayer = p;
					Log.Debug($"Players: {p.name} match statistic will be updated.");
				}
			}
			// TODO: Match Result should contain progression over multiple rounds.
			MatchResult result = MatchLogic.UpdateMatchResult(updatedPlayer, update, matchPlayerStatistics);
			if (updatedPlayer != null && result != null)
			{
				matchState = MatchState.End;
				Log.Info("Match has ended, winner will be declared.");
				// TODO: Take player decisions into account before restarting the match
				// TODO: Include the statistics and match round progression in announcements
				AnnounceWinner(result);
				return;
			}
			Log.Error($"Ship: {update.Ship.props.shipName} does not belong to a player in this match."
			+ " Can't update match.");
		}

		/// <summary>
		/// Loads the characters a player can choose from a fixed path
		/// in the project.
		/// </summary>
		private void LoadAvailableArenas()
		{
			string[] files = Directory.GetFiles(arenaAssetsPath, "*.asset",
				SearchOption.TopDirectoryOnly);
			foreach (var file in files)
			{
				availableArenas.Add(AssetDatabase.LoadAssetAtPath<Arena>(file));
			}
		}

		/// <summary>
		/// Loads the different rules/game modes which are available,
		/// at the fixed asset path.
		/// </summary>
		private void LoadAvailableRules()
		{
			string[] files = Directory.GetFiles(ruleAssetsPath, "*.asset",
				SearchOption.TopDirectoryOnly);
			foreach (var file in files)
			{
				availableRules.Add(AssetDatabase.LoadAssetAtPath<MatchRule>(file));
			}
		}

		/// <summary>
		/// Creates statistics for the players participating in the match.
		/// </summary>
		public void SetupMatchPlayerStatistics()
		{
			matchPlayerStatistics.Clear();
			foreach (Player p in matchPlayers)
			{
				MatchPlayerStatistic mps = new MatchPlayerStatistic
				{
					IsOut = false,
					Lives = matchRule.lives,
					Score = matchRule.score,
					Time = matchRule.time
				};
				matchPlayerStatistics.Add(p, mps);
			}
		}

		/// <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.
		/// TODO: Also restarts the match right now, no matter what.
		/// </summary>
		/// <param name="mr">Result data of the completed match.</param>
		async public void AnnounceWinner(MatchResult mr)
		{
			UIManager.G.announcments.QueueAnnounceText($"{mr.Winner.playerName}" +
				" has won the match!", 1.618f);
			await Tween.Delay(1.618f);

			ResetMatch();

			UIManager.G.announcments.QueueAnnounceText("Restarting.", 0.3f);
			UIManager.G.announcments.QueueAnnounceText("Restarting..", 0.3f);
			UIManager.G.announcments.QueueAnnounceText("Restarting...", 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()
		{
			ResetMatchCharacters();
			SetupMatchPlayerStatistics();
		}

		/// <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 matchPlayers)
			{
				p.spawnedCharacter.transform.localPosition =
					arenaProperties.spawnPositions[p.playerNumber - 1];
			}
			SetupMatchPlayerStatistics();

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

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

		/// <summary>
		/// Spawns the characters which were chosen by the players
		/// and sets them up to be playable.
		/// </summary>
		/// <param name="players">List of players for this match</param>
		public void SpawnCharacters(List<Player> players)
		{
			// TODO: This belongs in another intialization method
			GameObject arena = GameObject.Find("Arena Placement");
			GameObject matchCamera = GameObject.Find("Match Camera");
			if (arena == null)
			{
				Log.Error("ArenaPlacement not found in scenes. Cannot spawn players.");
				return;
			}
			if (matchCamera == null)
			{
				Log.Error("Match camera not found in scenes. Cannot initialize spawned Characters.");
				return;
			}

			foreach (Player p in players)
			{
				GameObject shipObject = Instantiate(p.character.shipObject);
				p.spawnedCharacter = shipObject;
				shipObject.TryGetComponent(out Ship ship);
				ship.state = new ShipHandling.ShipState();
				ship.cameraOperator = matchCamera.GetComponent<CameraOperator>();
				shipObject.transform.SetParent(arena.transform, false);
				shipObject.transform.localPosition =
					arenaProperties.spawnPositions[p.playerNumber - 1];

				shipObject.transform.localScale = new Vector3();
				Tween.Scale(shipObject.transform, new Vector3(0.7f, 0.7f, 0.7f), 1f);
				matchPlayers.Add(p);
			}
		}

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

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

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

	}
}