ClientMods/CustomInteractions/CustomInteractions.cs

using EFT.InventoryLogic;
using EFT.UI;
using JetBrains.Annotations;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Reflection;
using UnityEngine;

using DynamicInteraction = GClass2815;
using EmptyInteractions = GClass2816<System.Enum>;

namespace IcyClawz.CustomInteractions
{
    [EditorBrowsable(EditorBrowsableState.Never)]
    public interface ICustomInteractionsProvider { } // Do not implement this directly

    public interface IItemCustomInteractionsProvider : ICustomInteractionsProvider
    {
        IEnumerable<CustomInteraction> GetCustomInteractions(ItemUiContext uiContext, EItemViewType viewType, Item item);
    }

    public static class CustomInteractionsManager
    {
        internal static readonly List<ICustomInteractionsProvider> Providers = new List<ICustomInteractionsProvider>();

        public static void Register(ICustomInteractionsProvider provider)
        {
            if (!Providers.Contains(provider))
            {
                Providers.Add(provider);
            }
        }
    }

    public class CustomInteraction
    {
        internal readonly CustomInteractionImpl Impl;

        public CustomInteraction()
        {
            Impl = new CustomInteractionImpl();
        }

        public Func<string> Caption { get => Impl.Caption; set => Impl.Caption = value; }
        public Func<Sprite> Icon { get => Impl.Icon; set => Impl.Icon = value; }
        public Action Action { get => Impl.Action; set => Impl.Action = value; }
        public Func<CustomSubInteractions> SubMenu { get => Impl.SubMenu; set => Impl.SubMenu = value; }
        public Func<bool> Enabled { get => Impl.Enabled; set => Impl.Enabled = value; }
        public Func<string> Error { get => Impl.Error; set => Impl.Error = value; }
    }

    internal sealed class CustomInteractionImpl : DynamicInteraction
    {
        public CustomInteractionImpl()
            : base(UnityEngine.Random.Range(0, int.MaxValue).ToString("x4")) { }

        public Func<string> Caption { get; set; }
        public new Func<Sprite> Icon { get; set; }
        public Action Action { get => action_0; set => action_0 = value; }
        public Func<CustomSubInteractions> SubMenu { get; set; }
        public Func<bool> Enabled { get; set; }
        public Func<string> Error { get; set; }

        public bool IsInteractive() =>
            Enabled?.Invoke() ?? true;
    }

    public abstract class CustomSubInteractions
    {
        internal readonly CustomSubInteractionsImpl Impl;

        public CustomSubInteractions(ItemUiContext uiContext)
        {
            Impl = new CustomSubInteractionsImpl(uiContext);
        }

        public bool ExaminationRequired { get => Impl._ExaminationRequired; set => Impl._ExaminationRequired = value; }

        public void Add(CustomInteraction customInteraction) =>
            Impl.AddCustomInteraction(customInteraction);

        public void Remove(CustomInteraction customInteraction) =>
            Impl.RemoveCustomInteraction(customInteraction);

        public void CallRedraw() =>
            Impl.CallRedraw();

        public void CallRedraw(string templateId) =>
            Impl.CallRedraw(templateId);
    }

    internal sealed class CustomSubInteractionsImpl : EmptyInteractions
    {
        public CustomSubInteractionsImpl(ItemUiContext uiContext)
            : base(uiContext) { }

        public IEnumerable<CustomInteractionImpl> CustomInteractions => DynamicInteractions.OfType<CustomInteractionImpl>();

        public bool _ExaminationRequired { get; set; } = true;

        public override bool ExaminationRequired => _ExaminationRequired;

        public override bool HasIcons => CustomInteractions.Any(customInteraction => customInteraction.Icon != null);

        public void CallRedraw() =>
            itemUiContext_0.RedrawContextMenus(null);
    }

    internal static class AbstractInteractionsExtensions
    {
        private static Dictionary<string, DynamicInteraction> GetDynamicInteractions<T>(this GClass2816<T> instance) where T : Enum =>
            typeof(GClass2816<T>).GetField("dictionary_1", BindingFlags.NonPublic | BindingFlags.Instance)
                .GetValue(instance) as Dictionary<string, DynamicInteraction>;

        public static void AddCustomInteraction<T>(this GClass2816<T> instance, CustomInteraction customInteraction) where T : Enum =>
            instance.GetDynamicInteractions()[customInteraction.Impl.Key] = customInteraction.Impl;

        public static void RemoveCustomInteraction<T>(this GClass2816<T> instance, CustomInteraction customInteraction) where T : Enum =>
            instance.GetDynamicInteractions().Remove(customInteraction.Impl.Key);
    }

    internal static class InteractionButtonsContainerExtensions
    {
        private static readonly FieldInfo ButtonsContainerField =
            typeof(InteractionButtonsContainer).GetField("_buttonsContainer", BindingFlags.NonPublic | BindingFlags.Instance);

        private static RectTransform GetButtonsContainer(this InteractionButtonsContainer instance) =>
            ButtonsContainerField.GetValue(instance) as RectTransform;

        private static readonly FieldInfo ButtonTemplateField =
            typeof(InteractionButtonsContainer).GetField("_buttonTemplate", BindingFlags.NonPublic | BindingFlags.Instance);

        private static SimpleContextMenuButton GetButtonTemplate(this InteractionButtonsContainer instance) =>
            ButtonTemplateField.GetValue(instance) as SimpleContextMenuButton;

        private static readonly FieldInfo CurrentButtonField =
            typeof(InteractionButtonsContainer).GetField("simpleContextMenuButton_0", BindingFlags.NonPublic | BindingFlags.Instance);

        private static void SetCurrentButton(this InteractionButtonsContainer instance, SimpleContextMenuButton button) =>
            CurrentButtonField.SetValue(instance, button);

        private static readonly MethodInfo CreateButtonMethod =
            typeof(InteractionButtonsContainer).GetMethod("method_1", BindingFlags.NonPublic | BindingFlags.Instance);

        private static SimpleContextMenuButton CreateButton(this InteractionButtonsContainer instance,
            string key, string caption, SimpleContextMenuButton template, RectTransform container,
            [CanBeNull] Sprite sprite, [CanBeNull] Action onButtonClicked, [CanBeNull] Action onMouseHover,
            bool subMenu = false, bool autoClose = true) =>
            (SimpleContextMenuButton)CreateButtonMethod.Invoke(instance, new object[] {
                key, caption, template, container, sprite, onButtonClicked, onMouseHover, subMenu, autoClose
            });

        private static readonly MethodInfo CloseSubMenuMethod =
            typeof(InteractionButtonsContainer).GetMethod("method_4", BindingFlags.NonPublic | BindingFlags.Instance);

        private static void CloseSubMenu(this InteractionButtonsContainer instance) =>
            CloseSubMenuMethod.Invoke(instance, null);

        private static readonly MethodInfo AddButtonMethod =
            typeof(InteractionButtonsContainer).GetMethod("method_5", BindingFlags.NonPublic | BindingFlags.Instance);

        private static void AddButton(this InteractionButtonsContainer instance, SimpleContextMenuButton button) =>
            AddButtonMethod.Invoke(instance, new object[] { button });

        public static void AddCustomButton(this InteractionButtonsContainer instance, CustomInteractionImpl customInteractionImpl)
        {
            bool isInteractive = customInteractionImpl.IsInteractive();
            SimpleContextMenuButton button = null;
            button = instance.CreateButton(
                customInteractionImpl.Key,
                customInteractionImpl.Caption?.Invoke() ?? string.Empty,
                instance.GetButtonTemplate(),
                instance.GetButtonsContainer(),
                customInteractionImpl.Icon?.Invoke(),
                () =>
                {
                    if (isInteractive)
                    {
                        customInteractionImpl.Execute();
                    }
                },
                () =>
                {
                    instance.SetCurrentButton(button);
                    instance.CloseSubMenu();
                    if (isInteractive)
                    {
                        var subMenu = customInteractionImpl.SubMenu?.Invoke();
                        if (subMenu != null)
                        {
                            instance.SetSubInteractions(subMenu.Impl);
                        }
                    }
                },
                customInteractionImpl.SubMenu != null,
                false
            );
            button.SetButtonInteraction(
                (isInteractive, customInteractionImpl.Error?.Invoke() ?? string.Empty)
            );
            instance.AddButton(button);
        }
    }
}