#nullable enable
using System.Collections.Generic;
using Content.Server.Body;
using Content.Server.Body.Mechanisms;
using Content.Server.Utility;
using Content.Shared.Body.Mechanism;
using Content.Shared.Body.Surgery;
using Content.Shared.Interfaces;
using Content.Shared.Interfaces.GameObjects.Components;
using Robust.Server.GameObjects;
using Robust.Server.GameObjects.Components.UserInterface;
using Robust.Server.Interfaces.GameObjects;
using Robust.Server.Interfaces.Player;
using Robust.Shared.GameObjects;
using Robust.Shared.Interfaces.GameObjects;
using Robust.Shared.IoC;
using Robust.Shared.Localization;
using Robust.Shared.Prototypes;
using Robust.Shared.Serialization;
using Robust.Shared.Utility;
using Robust.Shared.ViewVariables;

namespace Content.Server.GameObjects.Components.Body
{
    /// <summary>
    ///     Component representing a dropped, tangible <see cref="Mechanism"/> entity.
    /// </summary>
    [RegisterComponent]
    public class DroppedMechanismComponent : Component, IAfterInteract
    {
        [Dependency] private readonly IPrototypeManager _prototypeManager = default!;

        public sealed override string Name => "DroppedMechanism";

        private readonly Dictionary<int, object> _optionsCache = new Dictionary<int, object>();

        private BodyManagerComponent? _bodyManagerComponentCache;

        private int _idHash;

        private IEntity? _performerCache;

        [ViewVariables] public IMechanism ContainedMechanism { get; private set; } = default!;

        [ViewVariables] private BoundUserInterface? UserInterface => Owner.GetUIOrNull(GenericSurgeryUiKey.Key);

        void IAfterInteract.AfterInteract(AfterInteractEventArgs eventArgs)
        {
            if (eventArgs.Target == null)
            {
                return;
            }

            CloseAllSurgeryUIs();
            _optionsCache.Clear();
            _performerCache = null;
            _bodyManagerComponentCache = null;

            if (eventArgs.Target.TryGetComponent<BodyManagerComponent>(out var bodyManager))
            {
                SendBodyPartListToUser(eventArgs, bodyManager);
            }
            else if (eventArgs.Target.TryGetComponent<DroppedBodyPartComponent>(out var droppedBodyPart))
            {
                DebugTools.AssertNotNull(droppedBodyPart.ContainedBodyPart);

                if (!droppedBodyPart.ContainedBodyPart.TryInstallDroppedMechanism(this))
                {
                    eventArgs.Target.PopupMessage(eventArgs.User, Loc.GetString("You can't fit it in!"));
                }
            }
        }

        public override void Initialize()
        {
            base.Initialize();

            if (UserInterface != null)
            {
                UserInterface.OnReceiveMessage += UserInterfaceOnOnReceiveMessage;
            }
        }

        public void InitializeDroppedMechanism(IMechanism data)
        {
            ContainedMechanism = data;
            Owner.Name = Loc.GetString(ContainedMechanism.Name);

            if (Owner.TryGetComponent(out SpriteComponent? component))
            {
                component.LayerSetRSI(0, data.RSIPath);
                component.LayerSetState(0, data.RSIState);
            }
        }

        public override void ExposeData(ObjectSerializer serializer)
        {
            // This is a temporary way to have spawnable hard-coded DroppedMechanismComponent prototypes
            // In the future (when it becomes possible) DroppedMechanismComponent should be auto-generated from
            // the Mechanism prototypes
            var debugLoadMechanismData = "";
            base.ExposeData(serializer);

            serializer.DataField(ref debugLoadMechanismData, "debugLoadMechanismData", "");

            if (serializer.Reading && debugLoadMechanismData != "")
            {
                _prototypeManager.TryIndex(debugLoadMechanismData!, out MechanismPrototype data);

                var mechanism = new Mechanism(data);
                mechanism.EnsureInitialize();

                InitializeDroppedMechanism(mechanism);
            }
        }

        private void SendBodyPartListToUser(AfterInteractEventArgs eventArgs, BodyManagerComponent bodyManager)
        {
            // Create dictionary to send to client (text to be shown : data sent back if selected)
            var toSend = new Dictionary<string, int>();

            foreach (var (key, value) in bodyManager.Parts)
            {
                // For each limb in the target, add it to our cache if it is a valid option.
                if (value.CanInstallMechanism(ContainedMechanism))
                {
                    _optionsCache.Add(_idHash, value);
                    toSend.Add(key + ": " + value.Name, _idHash++);
                }
            }

            if (_optionsCache.Count > 0)
            {
                OpenSurgeryUI(eventArgs.User.GetComponent<BasicActorComponent>().playerSession);
                UpdateSurgeryUIBodyPartRequest(eventArgs.User.GetComponent<BasicActorComponent>().playerSession,
                    toSend);
                _performerCache = eventArgs.User;
                _bodyManagerComponentCache = bodyManager;
            }
            else // If surgery cannot be performed, show message saying so.
            {
                eventArgs.Target.PopupMessage(eventArgs.User,
                    Loc.GetString("You see no way to install the {0}.", Owner.Name));
            }
        }

        /// <summary>
        ///     Called after the client chooses from a list of possible BodyParts that can be operated on.
        /// </summary>
        private void HandleReceiveBodyPart(int key)
        {
            if (_performerCache == null ||
                !_performerCache.TryGetComponent(out IActorComponent? actor))
            {
                return;
            }

            CloseSurgeryUI(actor.playerSession);

            if (_bodyManagerComponentCache == null)
            {
                return;
            }

            // TODO: sanity checks to see whether user is in range, user is still able-bodied, target is still the same, etc etc
            if (!_optionsCache.TryGetValue(key, out var targetObject))
            {
                _bodyManagerComponentCache.Owner.PopupMessage(_performerCache,
                    Loc.GetString("You see no useful way to use the {0} anymore.", Owner.Name));
                return;
            }

            var target = (BodyPart) targetObject;
            var message = target.TryInstallDroppedMechanism(this)
                ? Loc.GetString("You jam the {0} inside {1:them}.", ContainedMechanism.Name, _performerCache)
                : Loc.GetString("You can't fit it in!");

            _bodyManagerComponentCache.Owner.PopupMessage(_performerCache, message);

            // TODO: {1:theName}
        }

        private void OpenSurgeryUI(IPlayerSession session)
        {
            UserInterface?.Open(session);
        }

        private void UpdateSurgeryUIBodyPartRequest(IPlayerSession session, Dictionary<string, int> options)
        {
            UserInterface?.SendMessage(new RequestBodyPartSurgeryUIMessage(options), session);
        }

        private void CloseSurgeryUI(IPlayerSession session)
        {
            UserInterface?.Close(session);
        }

        private void CloseAllSurgeryUIs()
        {
            UserInterface?.CloseAll();
        }

        private void UserInterfaceOnOnReceiveMessage(ServerBoundUserInterfaceMessage message)
        {
            switch (message.Message)
            {
                case ReceiveBodyPartSurgeryUIMessage msg:
                    HandleReceiveBodyPart(msg.SelectedOptionId);
                    break;
            }
        }
    }
}