#nullable enable
using System;
using System.Linq;
using Content.Shared.Damage;
using Content.Shared.GameObjects.Components.Body;
using Content.Shared.GameObjects.Components.Body.Part;
using Content.Shared.GameObjects.Components.Damage;
using Robust.Server.Interfaces.Console;
using Robust.Server.Interfaces.Player;
using Robust.Shared.GameObjects;
using Robust.Shared.Interfaces.GameObjects;
using Robust.Shared.Interfaces.Random;
using Robust.Shared.IoC;
using Robust.Shared.Prototypes;
using Robust.Shared.Random;

namespace Content.Server.GameObjects.Components.Body
{
    class AddHandCommand : IClientCommand
    {
        public const string DefaultHandPrototype = "LeftHandHuman";

        public string Command => "addhand";
        public string Description => "Adds a hand to your entity.";
        public string Help => $"Usage: {Command} <entityUid> <handPrototypeId> / {Command} <entityUid> / {Command} <handPrototypeId> / {Command}";

        public void Execute(IConsoleShell shell, IPlayerSession? player, string[] args)
        {
            if (args.Length > 1)
            {
                shell.SendText(player, Help);
                return;
            }

            var entityManager = IoCManager.Resolve<IEntityManager>();
            var prototypeManager = IoCManager.Resolve<IPrototypeManager>();

            IEntity entity;
            IEntity hand;

            switch (args.Length)
            {
                case 0:
                {
                    if (player == null)
                    {
                        shell.SendText(player, "Only a player can run this command without arguments.");
                        return;
                    }

                    if (player.AttachedEntity == null)
                    {
                        shell.SendText(player, "You don't have an entity to add a hand to.");
                        return;
                    }

                    entity = player.AttachedEntity;
                    hand = entityManager.SpawnEntity(DefaultHandPrototype, entity.Transform.Coordinates);
                    break;
                }
                case 1:
                {
                    if (EntityUid.TryParse(args[0], out var uid))
                    {
                        if (!entityManager.TryGetEntity(uid, out var parsedEntity))
                        {
                            shell.SendText(player, $"No entity found with uid {uid}");
                            return;
                        }

                        entity = parsedEntity;
                        hand = entityManager.SpawnEntity(DefaultHandPrototype, entity.Transform.Coordinates);
                    }
                    else
                    {
                        if (player == null)
                        {
                            shell.SendText(player,
                                "You must specify an entity to add a hand to when using this command from the server terminal.");
                            return;
                        }

                        if (player.AttachedEntity == null)
                        {
                            shell.SendText(player, "You don't have an entity to add a hand to.");
                            return;
                        }

                        entity = player.AttachedEntity;
                        hand = entityManager.SpawnEntity(args[0], entity.Transform.Coordinates);
                    }

                    break;
                }
                case 2:
                {
                    if (!EntityUid.TryParse(args[0], out var uid))
                    {
                        shell.SendText(player, $"{args[0]} is not a valid entity uid.");
                        return;
                    }

                    if (!entityManager.TryGetEntity(uid, out var parsedEntity))
                    {
                        shell.SendText(player, $"No entity exists with uid {uid}.");
                        return;
                    }

                    entity = parsedEntity;

                    if (!prototypeManager.HasIndex<EntityPrototype>(args[1]))
                    {
                        shell.SendText(player, $"No hand entity exists with id {args[1]}.");
                        return;
                    }

                    hand = entityManager.SpawnEntity(args[1], entity.Transform.Coordinates);

                    break;
                }
                default:
                {
                    shell.SendText(player, Help);
                    return;
                }
            }

            if (!entity.TryGetComponent(out IBody? body))
            {
                var random = IoCManager.Resolve<IRobustRandom>();
                var text = $"You have no body{(random.Prob(0.2f) ? " and you must scream." : ".")}";

                shell.SendText(player, text);
                return;
            }

            if (!hand.TryGetComponent(out IBodyPart? part))
            {
                shell.SendText(player, $"Hand entity {hand} does not have a {nameof(IBodyPart)} component.");
                return;
            }

            var slot = part.GetHashCode().ToString();
            var response = body.TryAddPart(slot, part, true)
                ? $"Added hand to entity {entity.Name}"
                : $"Error occurred trying to add a hand to entity {entity.Name}";

            shell.SendText(player, response);
        }
    }

    class RemoveHandCommand : IClientCommand
    {
        public string Command => "removehand";
        public string Description => "Removes a hand from your entity.";
        public string Help => $"Usage: {Command}";

        public void Execute(IConsoleShell shell, IPlayerSession? player, string[] args)
        {
            if (player == null)
            {
                shell.SendText(player, "Only a player can run this command.");
                return;
            }

            if (player.AttachedEntity == null)
            {
                shell.SendText(player, "You have no entity.");
                return;
            }

            if (!player.AttachedEntity.TryGetBody(out var body))
            {
                var random = IoCManager.Resolve<IRobustRandom>();
                var text = $"You have no body{(random.Prob(0.2f) ? " and you must scream." : ".")}";

                shell.SendText(player, text);
                return;
            }

            var hand = body.Parts.FirstOrDefault(x => x.Value.PartType == BodyPartType.Hand);
            if (hand.Value.Equals(default))
            {
                shell.SendText(player, "You have no hands.");
            }
            else
            {
                body.RemovePart(hand.Value, true);
            }
        }
    }

    class DestroyMechanismCommand : IClientCommand
    {
        public string Command => "destroymechanism";
        public string Description => "Destroys a mechanism from your entity";
        public string Help => $"Usage: {Command} <mechanism>";

        public void Execute(IConsoleShell shell, IPlayerSession? player, string[] args)
        {
            if (player == null)
            {
                shell.SendText(player, "Only a player can run this command.");
                return;
            }

            if (args.Length == 0)
            {
                shell.SendText(player, Help);
                return;
            }

            if (player.AttachedEntity == null)
            {
                shell.SendText(player, "You have no entity.");
                return;
            }

            if (!player.AttachedEntity.TryGetBody(out var body))
            {
                var random = IoCManager.Resolve<IRobustRandom>();
                var text = $"You have no body{(random.Prob(0.2f) ? " and you must scream." : ".")}";

                shell.SendText(player, text);
                return;
            }

            var mechanismName = string.Join(" ", args).ToLowerInvariant();

            foreach (var part in body.Parts.Values)
            foreach (var mechanism in part.Mechanisms)
            {
                if (mechanism.Name.ToLowerInvariant() == mechanismName)
                {
                    part.DeleteMechanism(mechanism);
                    shell.SendText(player, $"Mechanism with name {mechanismName} has been destroyed.");
                    return;
                }
            }

            shell.SendText(player, $"No mechanism was found with name {mechanismName}.");
        }
    }

    class HurtCommand : IClientCommand
    {
        public string Command => "hurt";
        public string Description => "Ouch";
        public string Help => $"Usage: {Command} <type> <amount> (<entity uid/_>) (<ignoreResistance>)";

        private void SendDamageTypes(IConsoleShell shell, IPlayerSession? player)
        {
            var msg = "";
            foreach (var dClass in Enum.GetNames(typeof(DamageClass)))
            {
                msg += $"\n{dClass}";
                var types = Enum.Parse<DamageClass>(dClass).ToTypes();
                foreach (var dType in types)
                {
                    msg += $"\n - {dType}";
                }
            }
            shell.SendText(player, $"Damage Types:{msg}");
        }

        public void Execute(IConsoleShell shell, IPlayerSession? player, string[] args)
        {
            // Check if we have enough for the dmg types to show
            if (args.Length > 0 && args[0] == "?")
            {
                SendDamageTypes(shell, player);
                return;
            }

            // Not enough args
            if (args.Length < 2)
            {
                shell.SendText(player, Help);
                return;
            }

            var ignoreResistance = false;
            var entityUid = player != null && player.AttachedEntityUid.HasValue ? player.AttachedEntityUid.Value : EntityUid.Invalid;
            if (!int.TryParse(args[1], out var amount) ||
                args.Length >= 3 && args[2] != "_" && !EntityUid.TryParse(args[2], out entityUid) ||
                args.Length >= 4 && !bool.TryParse(args[3], out ignoreResistance))
            {
                shell.SendText(player, Help);
                return;
            }

            if (entityUid == EntityUid.Invalid)
            {
                shell.SendText(player, "Not a valid entity.");
                return;
            }

            if (!IoCManager.Resolve<IEntityManager>().TryGetEntity(entityUid, out var ent))
            {
                shell.SendText(player, "Entity couldn't be found.");
                return;
            }

            if (!ent.TryGetComponent(out IDamageableComponent? damageable))
            {
                shell.SendText(player, "Entity can't be damaged.");
                return;
            }

            if (Enum.TryParse<DamageClass>(args[0], true, out var dmgClass))
            {
                if (!damageable.ChangeDamage(dmgClass, amount, ignoreResistance))
                    shell.SendText(player, "Something went wrong!");
                return;
            }
            // Fall back to DamageType
            else if (Enum.TryParse<DamageType>(args[0], true, out var dmgType))
            {
                if (!damageable.ChangeDamage(dmgType, amount, ignoreResistance))
                    shell.SendText(player, "Something went wrong!");
                return;
            }
            else
            {
                SendDamageTypes(shell, player);
            }
        }
    }
}