using Interactables.Interobjects.DoorUtils;
using InventorySystem.Items;
using InventorySystem.Items.Firearms.Modules;
using LabApi.Events.Arguments.PlayerEvents;
using LabApi.Events.Arguments.Scp914Events;
using LabApi.Events.Arguments.ServerEvents;
using LabApi.Events.Handlers;
using LabApi.Features;
using LabApi.Features.Wrappers;
using LabApi.Loader.Features.Plugins;
using MapGeneration;
using MEC;
using PlayerRoles;
using UnityEngine;
using Logger = LabApi.Features.Console.Logger;
using Random = System.Random;
using Vector3 = UnityEngine.Vector3;

namespace CustomClasses;

/// <summary>
/// Main plugin class for CustomClasses. Handles plugin lifecycle and event subscriptions.
/// </summary>
public sealed class CustomClasses : Plugin
{
    private readonly CustomClassManager _classManager;
    public CustomClasses()
    {
        _classManager = new CustomClassManager();
    }

    /// <inheritdoc/>
    public override string Name => "CustomClasses";
    /// <inheritdoc/>
    public override string Author => "Code002Lover";
    /// <inheritdoc/>
    public override Version Version { get; } = new(1, 0, 0);
    /// <inheritdoc/>
    public override string Description => "Adds custom classes to the game";
    /// <inheritdoc/>
    public override Version RequiredApiVersion { get; } = new(LabApiProperties.CompiledVersion);

    /// <summary>
    /// Configuration for the Janitor class.
    /// </summary>
    public JanitorConfig JanitorConfig { get; private set; } = new();
    /// <summary>
    /// Configuration for the Research Subject class.
    /// </summary>
    public ResearchSubjectConfig ResearchSubjectConfig { get; private set; } = new();
    /// <summary>
    /// Configuration for the Head Guard class.
    /// </summary>
    public HeadGuardConfig HeadGuardConfig { get; private set; } = new();
    /// <summary>
    /// Configuration for the Medic class.
    /// </summary>
    public MedicConfig MedicConfig { get; private set; } = new();
    /// <summary>
    /// Configuration for the Gambler class.
    /// </summary>
    public GamblerConfig GamblerConfig { get; private set; } = new();

    /// <inheritdoc/>
    public override void Enable()
    {
        PlayerEvents.Spawned += OnPlayerSpawned;
        ServerEvents.RoundEnded += OnRoundEnded;
        Scp914Events.ProcessingPickup += OnScp914ProcessingPickup;
        Scp914Events.ProcessingInventoryItem += OnScp914ProcessingInventoryItem;
    }

    /// <inheritdoc/>
    public override void Disable()
    {
        PlayerEvents.Spawned -= OnPlayerSpawned;
        ServerEvents.RoundEnded -= OnRoundEnded;
        Scp914Events.ProcessingPickup -= OnScp914ProcessingPickup;
        Scp914Events.ProcessingInventoryItem -= OnScp914ProcessingInventoryItem;
    }

    private void OnRoundEnded(RoundEndedEventArgs ev)
    {
        _classManager.ResetSpawnStates();
    }

    private void OnPlayerSpawned(PlayerSpawnedEventArgs ev)
    {
        if (_classManager.TryHandleSpawn(ev.Player, JanitorConfig, typeof(JanitorConfig))) return;
        if (_classManager.TryHandleSpawn(ev.Player, ResearchSubjectConfig, typeof(ResearchSubjectConfig))) return;
        if (_classManager.TryHandleSpawn(ev.Player, HeadGuardConfig, typeof(HeadGuardConfig))) return;
        if (_classManager.TryHandleSpawn(ev.Player, MedicConfig, typeof(MedicConfig))) return;
        if (_classManager.TryHandleSpawn(ev.Player, GamblerConfig, typeof(GamblerConfig))) return;
    }

    private static void OnScp914ProcessingPickup(Scp914ProcessingPickupEventArgs ev)
    {
        if (ev.Pickup.Type < ItemType.KeycardCustomTaskForce) return;
        // Process custom upgrade
        if (ev.Pickup is not KeycardPickup keycard) return;
        var pickup = Pickup.Create(ItemType.KeycardMTFCaptain, keycard.Position);
        keycard.Destroy();
        pickup?.Spawn();
    }

    private static void OnScp914ProcessingInventoryItem(Scp914ProcessingInventoryItemEventArgs ev)
    {
        if (ev.Item.Type < ItemType.KeycardCustomTaskForce) return;
        // Process custom upgrade
        if (ev.Item is not KeycardItem keycard) return;
        ev.Player.RemoveItem(keycard);
        ev.Player.AddItem(ItemType.KeycardMTFCaptain, ItemAddReason.Scp914Upgrade);
    }
}

/// <summary>
/// Manages custom class handlers and spawn state.
/// </summary>
public class CustomClassManager
{
    private readonly Dictionary<Type, ICustomClassHandler> _handlers = new();
    private readonly object _lock = new();
    private readonly Random _random = new();
    private readonly Dictionary<Type, SpawnState> _spawnStates = new();

    /// <summary>
    /// Initializes a new instance of the <see cref="CustomClassManager"/> class and registers all handlers.
    /// </summary>
    public CustomClassManager()
    {
        RegisterHandler<JanitorConfig>(new JanitorHandler(this));
        RegisterHandler<ResearchSubjectConfig>(new ResearchSubjectHandler(this));
        RegisterHandler<HeadGuardConfig>(new HeadGuardHandler());
        RegisterHandler<MedicConfig>(new MedicHandler());
        RegisterHandler<GamblerConfig>(new GamblerHandler());
    }

    /// <summary>
    /// Teleports a player to a position near the specified location.
    /// </summary>
    /// <param name="player">The player to teleport.</param>
    /// <param name="position">The base position.</param>
    public void TeleportPlayerToAround(Player player, Vector3 position)
    {
        player.Position = position + new Vector3(0, 1, 0) + new Vector3((float)(_random.NextDouble() * 2), 0, (float)(_random.NextDouble() * 2));
    }

    /// <summary>
    /// Registers a handler for a specific custom class config type.
    /// </summary>
    /// <typeparam name="T">The config type.</typeparam>
    /// <param name="handler">The handler instance.</param>
    private void RegisterHandler<T>(ICustomClassHandler handler) where T : CustomClassConfig
    {
        lock (_lock)
        {
            _spawnStates[typeof(T)] = new SpawnState();
            _handlers[typeof(T)] = handler;
        }
    }

    /// <summary>
    /// Resets all spawn states for a new round.
    /// </summary>
    public void ResetSpawnStates()
    {
        lock (_lock)
        {
            foreach (var key in _spawnStates.Keys.ToList())
                _spawnStates[key] = new SpawnState();
        }
    }

    /// <summary>
    /// Attempts to handle a player spawn for a given custom class config.
    /// </summary>
    /// <param name="player">The player to handle.</param>
    /// <param name="config">The config instance.</param>
    /// <param name="configType">The config type.</param>
    /// <returns>True if the spawn was handled; otherwise, false.</returns>
    public bool TryHandleSpawn(Player player, CustomClassConfig config, Type configType)
    {
        if (player.Role != config.RequiredRole) return false;
        if (Player.ReadyList.Count() <= config.MinPlayers) return false;

        lock (_lock)
        {
            if (!_spawnStates.TryGetValue(configType, out var state))
                return false;
            if (state.Spawns >= config.MaxSpawns)
            {
                Logger.Debug($"Max spawns reached {configType} - {player.Nickname}");
                return false;
            }
            if (_random.NextDouble() > config.ChancePerPlayer)
            {
                Logger.Debug($"Chance not met {configType} - {player.Nickname}");
                return false;
            }
            state.Spawns++;
            Logger.Debug($"Player spawning {configType} - {player.Nickname} - {state.Spawns} / {config.MaxSpawns}");
            if (!_handlers.TryGetValue(configType, out var handler))
                return false;
            Timing.CallDelayed(0.5f, () => { handler.HandleSpawn(player, config, _random); });
            return true;
        }
    }
}

/// <summary>
/// Interface for custom class spawn handlers.
/// </summary>
public interface ICustomClassHandler
{
    /// <summary>
    /// Handles the logic for spawning a player as a custom class.
    /// </summary>
    /// <param name="player">The player to spawn.</param>
    /// <param name="config">The configuration for the custom class.</param>
    /// <param name="random">A random number generator.</param>
    void HandleSpawn(Player player, CustomClassConfig config, Random random);
}

/// <summary>
/// Handler for the Janitor custom class.
/// </summary>
public class JanitorHandler(CustomClassManager manager) : ICustomClassHandler
{
    public void HandleSpawn(Player player, CustomClassConfig config, Random random)
    {
        var scp914 = Map.Rooms.FirstOrDefault(r => r.Name == RoomName.Lcz914);
        if (scp914 == null)
        {
            Logger.Error("LCZ 914 room not found for Janitor spawn.");
            return;
        }
        manager.TeleportPlayerToAround(player, scp914.Position);
        foreach (var spawnItem in config.Items)
        {
            player.AddItem(spawnItem, ItemAddReason.StartingItem);
            Logger.Debug($"Gave player {player.Nickname} spawn item {spawnItem}");
        }
        player.SendBroadcast("You're a <color=#A0A0A0>Janitor</color>!", 3);
    }
}

/// <summary>
/// Handler for the Research Subject custom class.
/// </summary>
public class ResearchSubjectHandler(CustomClassManager manager) : ICustomClassHandler
{
    public void HandleSpawn(Player player, CustomClassConfig config, Random random)
    {
        var scientist = Player.ReadyList.FirstOrDefault(p => p.Role == RoleTypeId.Scientist);
        if (scientist == null)
        {
            Logger.Error("No Scientist found for Research Subject spawn.");
            return;
        }
        manager.TeleportPlayerToAround(player, scientist.Position);
        foreach (var spawnItem in config.Items)
        {
            player.AddItem(spawnItem, ItemAddReason.StartingItem);
            Logger.Debug($"Gave player {player.Nickname} spawn item {spawnItem}");
        }
        player.SendBroadcast("You're a <color=#944710>Research Subject</color>!", 3);
    }
}

/// <summary>
/// Handler for the Head Guard custom class.
/// </summary>
public class HeadGuardHandler : ICustomClassHandler
{
    public void HandleSpawn(Player player, CustomClassConfig config, Random random)
    {
        player.RemoveItem(ItemType.KeycardGuard);
        KeycardItem.CreateCustomKeycardTaskForce(player, "Head Guard Keycard", $"HG. {player.Nickname}", new KeycardLevels(1, 1, 2), Color.blue, Color.cyan, "1", 0);
        player.AddItem(ItemType.Adrenaline, ItemAddReason.StartingItem);
        player.RemoveItem(ItemType.ArmorLight);
        player.AddItem(ItemType.ArmorCombat, ItemAddReason.StartingItem);
        player.RemoveItem(ItemType.GunFSP9);
        var pickup = Pickup.Create(ItemType.GunCrossvec, Vector3.one);
        if (pickup is FirearmPickup firearm)
        {
            if (firearm.Base.Template.TryGetModule(out MagazineModule magazine))
            {
                magazine.ServerSetInstanceAmmo(firearm.Base.Template.ItemSerial, magazine.AmmoMax);
            }
            else
            {
                Logger.Error("Failed to get magazine module for Head Guard firearm.");
            }
        }
        else
        {
            Logger.Error("Failed to get firearm from pickup for Head Guard.");
        }
        if (pickup != null) player.AddItem(pickup);
        player.SetAmmo(ItemType.Ammo9x19, 120);
        player.SendBroadcast("You're a <color=#00B7EB>Head Guard</color>!", 3);
    }
}

/// <summary>
/// Handler for the Medic custom class.
/// </summary>
public class MedicHandler : ICustomClassHandler
{
    public void HandleSpawn(Player player, CustomClassConfig config, Random random)
    {
        foreach (var spawnItem in config.Items)
        {
            player.AddItem(spawnItem, ItemAddReason.StartingItem);
            Logger.Debug($"Gave player {player.Nickname} spawn item {spawnItem}");
        }
        player.SendBroadcast("You're a <color=#727472>Medic</color>!", 3);
    }
}

/// <summary>
/// Base handler for simple item-giving custom classes.
/// </summary>
public abstract class SimpleAddItemHandler : ICustomClassHandler
{
    public virtual void HandleSpawn(Player player, CustomClassConfig config, Random random)
    {
        foreach (var spawnItem in config.Items)
        {
            player.AddItem(spawnItem, ItemAddReason.StartingItem);
            Logger.Debug($"Gave player {player.Nickname} spawn item {spawnItem}");
        }
    }
}

/// <summary>
/// Handler for the Gambler custom class.
/// </summary>
public class GamblerHandler : SimpleAddItemHandler
{
    public override void HandleSpawn(Player player, CustomClassConfig config, Random random)
    {
        base.HandleSpawn(player, config, random);
        player.SendBroadcast("You're a <color=#FF9966>Gambler</color>!", 3);
    }
}

/// <summary>
/// Represents the base configuration for a custom class.
/// </summary>
public abstract class CustomClassConfig
{
    /// <summary>
    /// Minimum number of players required for this class to spawn.
    /// </summary>
    public virtual int MinPlayers { get; set; } = 4;
    /// <summary>
    /// Chance per player for this class to spawn (0.0 - 1.0).
    /// </summary>
    public virtual double ChancePerPlayer { get; set; } = 0.7;
    /// <summary>
    /// Maximum number of spawns for this class per round.
    /// </summary>
    public virtual int MaxSpawns { get; set; } = 1;
    /// <summary>
    /// Items to give to the player on spawn.
    /// </summary>
    public virtual ItemType[] Items { get; set; } = [];
    /// <summary>
    /// The required role for this class to be considered.
    /// </summary>
    public virtual RoleTypeId RequiredRole { get; set; } = RoleTypeId.ClassD;
}

/// <summary>
/// Configuration for the Research Subject class.
/// </summary>
public sealed class ResearchSubjectConfig : CustomClassConfig { }

/// <summary>
/// Configuration for the Janitor class.
/// </summary>
public sealed class JanitorConfig : CustomClassConfig
{
    public override int MinPlayers { get; set; } = 5;
    public override double ChancePerPlayer { get; set; } = 0.3;
    public override int MaxSpawns { get; set; } = 2;
    public override ItemType[] Items { get; set; } = [ItemType.KeycardJanitor];
}

/// <summary>
/// Configuration for the Head Guard class.
/// </summary>
public sealed class HeadGuardConfig : CustomClassConfig
{
    public override int MinPlayers { get; set; } = 9;
    public override RoleTypeId RequiredRole { get; set; } = RoleTypeId.FacilityGuard;
}

/// <summary>
/// Configuration for the Medic class.
/// </summary>
public sealed class MedicConfig : CustomClassConfig
{
    public override int MinPlayers { get; set; } = 5;
    public override double ChancePerPlayer { get; set; } = 0.3;
    public override int MaxSpawns { get; set; } = 1;
    public override ItemType[] Items { get; set; } = [ItemType.Medkit, ItemType.Adrenaline];
    public override RoleTypeId RequiredRole { get; set; } = RoleTypeId.Scientist;
}

/// <summary>
/// Configuration for the Gambler class.
/// </summary>
public sealed class GamblerConfig : CustomClassConfig
{
    public override double ChancePerPlayer { get; set; } = 0.3;
    public override int MaxSpawns { get; set; } = 5;
    public override ItemType[] Items { get; set; } = [ItemType.Coin, ItemType.Coin];
}

/// <summary>
/// Tracks the spawn state for a custom class.
/// </summary>
internal sealed record SpawnState
{
    public int Spawns;
}