using System;
using RobocraftX.Character;
using RobocraftX.Character.Movement;
using Unity.Mathematics;
using RobocraftX.Common;
using RobocraftX.Common.Players;
using RobocraftX.Physics;
using Svelto.ECS;
using Techblox.Camera;
using Techblox.FlyCam;
using TechbloxModdingAPI.Blocks;
using TechbloxModdingAPI.Players;
using TechbloxModdingAPI.Utility;
using UnityEngine;

namespace TechbloxModdingAPI
{
    /// <summary>
    /// An in-game player character. Any Leo you see is a player.
    /// </summary>
    public class Player : IEquatable<Player>, IEquatable<EGID>
    {
        // static functionality
		private static PlayerEngine playerEngine = new PlayerEngine();
		private static Player localPlayer;

        /// <summary>
		/// Checks if the specified player exists.
        /// </summary>
		/// <returns>Whether the player exists.</returns>
        /// <param name="player">Player type.</param>
		public static bool Exists(PlayerType player)
        {
            switch (player)
            {
                case PlayerType.Remote:
                    return playerEngine.GetRemotePlayer() != uint.MaxValue;
                case PlayerType.Local:
                    return playerEngine.GetLocalPlayer() != uint.MaxValue;
            }
            return false;
        }

        /// <summary>
        /// Checks if the specified player exists.
        /// </summary>
        /// <returns>Whether the player exists.</returns>
		/// <param name="player">The player's unique identifier.</param>
        public static bool Exists(uint player)
        {
            return playerEngine.ExistsById(player);
        }

        /// <summary>
        /// The amount of Players in the current game.
        /// </summary>
        /// <returns>The count.</returns>
        public static uint Count()
		{
			return (uint) playerEngine.GetAllPlayerCount();
		}

        /// <summary>
        /// Returns the current player belonging to this client.
        /// </summary>
        public static Player LocalPlayer
        {
	        get
	        {
		        if (localPlayer == null || localPlayer.Id != playerEngine.GetLocalPlayer())
			        localPlayer = new Player(PlayerType.Local);
		        return localPlayer;
	        }
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="T:TechbloxModdingAPI.Player"/> class.
        /// </summary>
        /// <param name="id">The player's unique identifier.</param>
        public Player(uint id)
        {
            this.Id = id;
            if (!Exists(id))
            {
                throw new PlayerNotFoundException($"No player with id {id} exists");
            }
            this.Type = playerEngine.GetLocalPlayer() == id ? PlayerType.Local : PlayerType.Remote;
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="T:TechbloxModdingAPI.Player"/> class.
        /// </summary>
        /// <param name="player">The player type. Chooses the first available player matching the criteria.</param>
        public Player(PlayerType player)
        {
            switch (player)
            {
                case PlayerType.Local:
                    this.Id = playerEngine.GetLocalPlayer();
                    break;
                case PlayerType.Remote:
                    this.Id = playerEngine.GetRemotePlayer();
                    break;
            }
            if (this.Id == uint.MaxValue)
            {
                throw new PlayerNotFoundException($"No player of {player} type exists");
            }
            this.Type = player;
        }

        // object fields & properties

        /// <summary>
        /// The player's type. 
		/// The player type is always relative to the current client, not the game host.
        /// </summary>
        /// <value>The enumerated player type.</value>
		public PlayerType Type { get; }

        /// <summary>
        /// The player's unique identifier.
        /// </summary>
        /// <value>The identifier.</value>
		public uint Id { get; }

        /// <summary>
        /// The player's current position.
        /// </summary>
        /// <value>The position.</value>
		public float3 Position
		{
			get => playerEngine.GetCharacterStruct<RigidBodyEntityStruct>(Id).Get().position;
			set => playerEngine.SetLocation(Id, value, false);
        }

        /// <summary>
        /// The player's current rotation.
        /// </summary>
        /// <value>The rotation.</value>
		public float3 Rotation
        {
	        get => ((Quaternion) (GameState.IsBuildMode()
		        ? playerEngine.GetCameraStruct<CharacterCameraEntityStruct>(Id).Get().rotation
		        : playerEngine.GetCharacterStruct<RigidBodyEntityStruct>(Id).Get().rotation)).eulerAngles;
	        set => _ = GameState.IsBuildMode()
		        ? playerEngine.GetCameraStruct<CharacterCameraEntityStruct>(Id).Get().rotation = quaternion.Euler(value)
		        : playerEngine.GetCharacterStruct<RigidBodyEntityStruct>(Id).Get().rotation = quaternion.Euler(value);
        }

        /// <summary>
        /// The player's current velocity.
        /// </summary>
        /// <value>The velocity.</value>
		public float3 Velocity
        {
	        get => playerEngine.GetCharacterStruct<RigidBodyEntityStruct>(Id).Get().velocity;
	        set => playerEngine.GetCharacterStruct<RigidBodyEntityStruct>(Id).Get().velocity = value;
        }

        /// <summary>
        /// The player's current angular velocity.
        /// </summary>
        /// <value>The angular velocity.</value>
		public float3 AngularVelocity
        {
	        get => playerEngine.GetCharacterStruct<RigidBodyEntityStruct>(Id).Get().angularVelocity;
	        set => playerEngine.GetCharacterStruct<RigidBodyEntityStruct>(Id).Get().angularVelocity = value;
        }

        /// <summary>
        /// The player's mass.
        /// </summary>
        /// <value>The mass.</value>
        public float Mass =>
	        1f / playerEngine.GetCharacterStruct<RigidBodyEntityStruct>(Id).Get().physicsMass.InverseMass;

        private float _ping = -1f;

        /// <summary>
        /// The player's latest network ping time.
        /// </summary>
        /// <value>The ping (s).</value>
        public float Ping
		{
			get
			{
				var opt = playerEngine.GetPlayerStruct<PlayerNetworkStatsEntityStruct>(Id, Type);
				if (opt)
				{
					_ping = opt.Get().lastPingTimeSinceLevelLoad ?? _ping;
				}
				return _ping;
			}
		}

        /// <summary>
        /// The player's initial health when entering Simulation (aka Time Running) mode.
        /// </summary>
        /// <value>The initial health.</value>
        public float InitialHealth
        {
	        get
	        {
		        var opt = playerEngine.GetCharacterStruct<CharacterHealthEntityStruct>(Id);
		        return opt ? opt.Get().initialHealth : -1f;
	        }

	        set => playerEngine.GetCharacterStruct<CharacterHealthEntityStruct>(Id).Get().initialHealth = value;
        }

        /// <summary>
        /// The player's current health in Simulation (aka Time Running) mode.
        /// </summary>
        /// <value>The current health.</value>
		public float CurrentHealth
        {
	        get
	        {
		        var opt = playerEngine.GetCharacterStruct<CharacterHealthEntityStruct>(Id);
		        return opt ? opt.Get().currentHealth : -1f;
	        }

	        set => playerEngine.GetCharacterStruct<CharacterHealthEntityStruct>(Id).Get().currentHealth = value;
        }

        /// <summary>
        /// Whether this <see cref="T:TechbloxModdingAPI.Player"/> is damageable.
        /// </summary>
        /// <value><c>true</c> if damageable; otherwise, <c>false</c>.</value>
        public bool Damageable
        {
	        get
	        {
		        var opt = playerEngine.GetCharacterStruct<CharacterHealthEntityStruct>(Id);
		        return opt.Get().canTakeDamageStat;
	        }

	        set
	        {
		        ref var healthStruct = ref playerEngine.GetCharacterStruct<CharacterHealthEntityStruct>(Id).Get();
		        healthStruct.canTakeDamage = value;
		        healthStruct.canTakeDamageStat = value;
	        }
        }

        /// <summary>
        /// The player's lives when initially entering Simulation (aka Time Running) mode.
        /// </summary>
        /// <value>The initial lives.</value>
        public uint InitialLives
		{
	        get
	        {
		        var opt = playerEngine.GetCharacterStruct<CharacterLivesEntityComponent>(Id);
		        return opt ? opt.Get().initialLives : uint.MaxValue;
	        }

	        set => playerEngine.GetCharacterStruct<CharacterLivesEntityComponent>(Id).Get().initialLives = value;
		}

        /// <summary>
        /// The player's current lives in Simulation (aka Time Running) mode.
        /// </summary>
        /// <value>The current lives.</value>
		public uint CurrentLives
        {
	        get
	        {
		        var opt = playerEngine.GetCharacterStruct<CharacterLivesEntityComponent>(Id);
		        return opt ? opt.Get().currentLives : uint.MaxValue;
	        }

	        set => playerEngine.GetCharacterStruct<CharacterLivesEntityComponent>(Id).Get().currentLives = value;
        }

        /*/// <summary>
        /// Whether the Game Over screen is displayed for the player.
        /// </summary>
        /// <value><c>true</c> if game over; otherwise, <c>false</c>.</value>
        public bool GameOver
		{
			get => playerEngine.GetGameOverScreen(Id);
		}*/

        /// <summary>
        /// Whether the player is dead.
		/// If <c>true</c>, hopefully it was quick.
        /// </summary>
        /// <value><c>true</c> if dead; otherwise, <c>false</c>.</value>
        public bool Dead
		{
			get => playerEngine.IsDead(Id);
		}

        /// <summary>
        /// The player's selected block ID in their hand.
        /// </summary>
        /// <value>The selected block.</value>
		public BlockIDs SelectedBlock
		{
			get
			{
				var optstruct = playerEngine.GetCharacterStruct<EquippedPartStruct>(Id);
				return optstruct ? (BlockIDs) optstruct.Get().SelectedDBPartID : BlockIDs.Invalid;
			}
		}

        /// <summary>
        /// The player's selected block color in their hand.
        /// </summary>
        /// <value>The selected block's color.</value>
		public BlockColor SelectedColor
        {
            get
            {
	            var optstruct = playerEngine.GetCharacterStruct<EquippedColourStruct>(Id);
	            return optstruct ? new BlockColor(optstruct.Get().indexInPalette) : BlockColors.Default;
            }
        }

		/// <summary>
        /// The player's selected block colour in their hand.
        /// </summary>
        /// <value>The selected block's colour.</value>
		public BlockColor SelectedColour
        {
            get
            {
	            var optstruct = playerEngine.GetCharacterStruct<EquippedColourStruct>(Id);
	            return optstruct ? new BlockColor(optstruct.Get().indexInPalette) : BlockColors.Default;
            }
        }

		/// <summary>
		/// The player's selected blueprint in their hand. Set to null to clear. Dispose after usage.
		/// </summary>
		public Blueprint SelectedBlueprint
		{
			get
			{
				var lbiso = playerEngine.GetPlayerStruct<LocalBlueprintInputStruct>(Id, Type);
				return lbiso ? new Blueprint(lbiso.Get().selectedBlueprintId) : null;
			}
			set => BlockGroup._engine.SelectBlueprint(value?.Id ?? uint.MaxValue);
		}

		/// <summary>
		/// The player's mode in time stopped mode, determining what they place.
		/// </summary>
		public PlayerBuildingMode BuildingMode => (PlayerBuildingMode) playerEngine
			.GetCharacterStruct<PlayerInputTimeStoppedContextStruct>(Id).Get().timeStoppedContext;

		/// <summary>
		/// Whether the player is sprinting.
		/// </summary>
		public bool Sprinting
		{
			get => GameState.IsBuildMode()
				? playerEngine.GetCharacterStruct<FlyCamMovementComponent>(Id).Get().sprinting
				: playerEngine.GetCharacterStruct<CharacterMovementEntityStruct>(Id).Get().isSprinting;
			set => _ = GameState.IsBuildMode()
				? playerEngine.GetCharacterStruct<FlyCamMovementComponent>(Id).Get().sprinting = value
				: playerEngine.GetCharacterStruct<CharacterMovementEntityStruct>(Id).Get().isSprinting = value;
		}

		/// <summary>
		/// Movement speed setting. Build mode (camera) and simulation mode settings are separate.
		/// </summary>
		public float SpeedSetting
		{
			get => GameState.IsBuildMode()
				? playerEngine.GetCharacterStruct<FlyCamMovementSettingsComponent>(Id).Get().speed
				: playerEngine.GetCharacterStruct<CharacterMovementSettingsEntityStruct>(Id).Get().moveSpeed;
			set => _ = GameState.IsBuildMode()
				? playerEngine.GetCharacterStruct<FlyCamMovementSettingsComponent>(Id).Get().speed = value
				: playerEngine.GetCharacterStruct<CharacterMovementSettingsEntityStruct>(Id).Get().moveSpeed = value;
		}
        
		/// <summary>
		/// The multiplier setting to use when sprinting. Build mode (camera) and simulation mode settings are separate.
		/// </summary>
		public float SpeedSprintMultiplierSetting
		{
			get => GameState.IsBuildMode()
				? playerEngine.GetCharacterStruct<FlyCamMovementSettingsComponent>(Id).Get().speedSprintMultiplier
				: playerEngine.GetCharacterStruct<CharacterMovementSettingsEntityStruct>(Id).Get().sprintSpeedMultiplier;
			set => _ = GameState.IsBuildMode()
				? playerEngine.GetCharacterStruct<FlyCamMovementSettingsComponent>(Id).Get().speedSprintMultiplier = value
				: playerEngine.GetCharacterStruct<CharacterMovementSettingsEntityStruct>(Id).Get().sprintSpeedMultiplier = value;
		}
        
		/// <summary>
		/// The acceleration setting of the player. Build mode (camera) and simulation mode settings are separate.
		/// </summary>
		public float AccelerationSetting
		{
			get => GameState.IsBuildMode()
				? playerEngine.GetCharacterStruct<FlyCamMovementSettingsComponent>(Id).Get().acceleration
				: playerEngine.GetCharacterStruct<CharacterMovementSettingsEntityStruct>(Id).Get().acceleration;
			set => _ = GameState.IsBuildMode()
				? playerEngine.GetCharacterStruct<FlyCamMovementSettingsComponent>(Id).Get().acceleration = value
				: playerEngine.GetCharacterStruct<CharacterMovementSettingsEntityStruct>(Id).Get().acceleration = value;
		}

		// object methods

        /// <summary>
        /// Teleport the player to the specified coordinates.
        /// </summary>
        /// <param name="x">The x coordinate.</param>
        /// <param name="y">The y coordinate.</param>
        /// <param name="z">The z coordinate.</param>
        /// <param name="relative">If set to <c>true</c> teleport relative to the player's current position.</param>
        /// <param name="exitSeat">If set to <c>true</c> exit any seat the player is in.</param>
        public void Teleport(float x, float y, float z, bool relative = true, bool exitSeat = true)
		{
			float3 location = new float3(x, y, z);
			if (relative)
			{
				location += Position;
			}
			playerEngine.SetLocation(Id, location, exitSeat: exitSeat);
		}
        
        /// <summary>
        /// Returns the block the player is currently looking at in build mode.
        /// </summary>
        /// <param name="maxDistance">The maximum distance from the player (default is the player's building reach)</param>
        /// <returns>The block or null if not found</returns>
        public Block GetBlockLookedAt(float maxDistance = -1f)
        {
	        var egid = playerEngine.GetThingLookedAt(Id, maxDistance);
	        return egid != EGID.Empty && egid.groupID != CommonExclusiveGroups.SIMULATION_BODIES_GROUP
		        ? Block.New(egid)
		        : null;
        }
        
        /// <summary>
        /// Returns the rigid body the player is currently looking at during simulation.
        /// </summary>
        /// <param name="maxDistance">The maximum distance from the player (default is the player's building reach)</param>
        /// <returns>The body or null if not found</returns>
        public SimBody GetSimBodyLookedAt(float maxDistance = -1f)
        {
	        var egid = playerEngine.GetThingLookedAt(Id, maxDistance);
	        return egid != EGID.Empty && egid.groupID == CommonExclusiveGroups.SIMULATION_BODIES_GROUP
		        ? new SimBody(egid)
		        : null;
        }

        /// <summary>
        /// Returns the blocks that are in the player's current selection.
        /// </summary>
        /// <returns>An array of blocks or an empty array</returns>
        public Block[] GetSelectedBlocks()
        {
	        return playerEngine.GetSelectedBlocks(Id);
        }

        public bool Equals(Player other)
        {
	        if (ReferenceEquals(null, other)) return false;
	        if (ReferenceEquals(this, other)) return true;
	        return Id == other.Id;
        }

        public bool Equals(EGID other)
        {
	        return Id == other.entityID && other.groupID == (Type == PlayerType.Local
		        ? PlayersExclusiveGroups.LocalPlayers
		        : PlayersExclusiveGroups.RemotePlayers);
        }

        public override bool Equals(object obj)
        {
	        if (ReferenceEquals(null, obj)) return false;
	        if (ReferenceEquals(this, obj)) return true;
	        if (obj.GetType() != this.GetType()) return false;
	        return Equals((Player) obj);
        }

        public override int GetHashCode()
        {
	        return (int) Id;
        }

        // internal methods

        internal static void Init()
		{
			Utility.GameEngineManager.AddGameEngine(playerEngine);
		}
    }
}