Pilz/Pilz.Collections/SimpleHistory/ObjectAction.cs

using System;
using System.Collections.Generic;
using global::System.Reflection;

namespace Pilz.Collections.SimpleHistory
{
    public class ObjectAction : ObjectBase
    {
        public object Object { get; set; } = null;
        public List<object> ParametersUndo { get; private set; } = new List<object>();
        public List<object> ParametersRedo { get; private set; } = new List<object>();
        public MethodInfo MethodUndo { get; set; } = null;
        public MethodInfo MethodRedo { get; set; } = null;
        public bool AutogenerateObject { get; set; } = true;

        /// <summary>
        /// Creates a new Instance of Object Action.
        /// </summary>
        public ObjectAction()
        {
        }

        private object GetMethodInfo(object obj, string name, BindingFlags flags)
        {
            return obj.GetType().GetMethod(name, flags);
        }

        /// <summary>
        /// Creates a new Instance of Object Action.
        /// </summary>
        /// <param name="obj">The Objects that contains the methodes to call.</param>
        /// <param name="methodNameUndo">The name of the methode to call on Undo.</param>
        /// <param name="methodNameRedo">The name of the methode to call on Redo.</param>
        public ObjectAction(object obj, string methodNameUndo, string methodNameRedo) : this(obj, methodNameUndo, methodNameRedo, Array.Empty<object>(), Array.Empty<object>(), BindingFlags.Default, BindingFlags.Default)
        {
        }
        /// <summary>
        /// Creates a new Instance of Object Action.
        /// </summary>
        /// <param name="obj">The Objects that contains the methodes to call.</param>
        /// <param name="methodNameUndo">The name of the methode to call on Undo.</param>
        /// <param name="methodNameRedo">The name of the methode to call on Redo.</param>
        /// <param name="paramsUndo">The parameters for calling the methode on Undo.</param>
        /// <param name="paramsRedo">The parameters for calling the methode on Redo.</param>
        public ObjectAction(object obj, string methodNameUndo, string methodNameRedo, object[] paramsUndo, object[] paramsRedo) : this(obj, methodNameUndo, methodNameRedo, paramsUndo, paramsRedo, BindingFlags.Default, BindingFlags.Default)
        {
        }
        /// <summary>
        /// Creates a new Instance of Object Action.
        /// </summary>
        /// <param name="obj">The Objects that contains the methodes to call.</param>
        /// <param name="methodNameUndo">The name of the methode to call on Undo.</param>
        /// <param name="methodNameRedo">The name of the methode to call on Redo.</param>
        /// <param name="paramsUndo">The parameters for calling the methode on Undo.</param>
        /// <param name="paramsRedo">The parameters for calling the methode on Redo.</param>
        /// <param name="methodFlagsUndo">The Binding Flags of Methode on Undo.</param>
        /// <param name="methodFlagsRedo">The Binding Flags of Methode on Redo.</param>
        public ObjectAction(object obj, string methodNameUndo, string methodNameRedo, object[] paramsUndo, object[] paramsRedo, BindingFlags methodFlagsUndo, BindingFlags methodFlagsRedo)
        {
            Object = obj;
            ParametersUndo.AddRange(paramsUndo);
            ParametersRedo.AddRange(paramsRedo);
            MethodUndo = (MethodInfo)GetMethodInfo(obj, methodNameUndo, GetFlags(methodFlagsUndo));
            MethodRedo = (MethodInfo)GetMethodInfo(obj, methodNameRedo, GetFlags(methodFlagsRedo));
        }
        /// <summary>
        /// Creates a new Instance of Object Action.
        /// </summary>
        /// <param name="obj">The Objects that contains the methodes to call.</param>
        /// <param name="methodNameUndo">The name of the methode to call on Undo.</param>
        /// <param name="methodNameRedo">The name of the methode to call on Redo.</param>
        /// <param name="methodFlagsUndo">The Binding Flags of Methode on Undo.</param>
        /// <param name="methodFlagsRedo">The Binding Flags of Methode on Redo.</param>
        public ObjectAction(object obj, string methodNameUndo, string methodNameRedo, BindingFlags methodFlagsUndo, BindingFlags methodFlagsRedo) : this(obj, methodNameUndo, methodNameRedo, Array.Empty<object>(), Array.Empty<object>(), methodFlagsUndo, methodFlagsRedo)
        {
        }

        /// <summary>
        /// Creates a new Instance of Object Action.
        /// </summary>
        /// <param name="obj">The Objects that contains the methodes to call.</param>
        /// <param name="methodUndo">The MethodInfo of the methode to call on Undo.</param>
        /// <param name="methodRedo">The MethodInfo of the methode to call on Redo.</param>
        public ObjectAction(object obj, MethodInfo methodUndo, MethodInfo methodRedo)
        {
            Object = obj;
            MethodUndo = methodUndo;
            MethodRedo = methodRedo;
        }
        /// <summary>
        /// Creates a new Instance of Object Action.
        /// </summary>
        /// <param name="obj">The Objects that contains the methodes to call.</param>
        /// <param name="methodUndo">The MethodInfo of the methode to call on Undo.</param>
        /// <param name="methodRedo">The MethodInfo of the methode to call on Redo.</param>
        /// <param name="paramsUndo">The parameters for calling the methode on Undo.</param>
        /// <param name="paramsRedo">The parameters for calling the methode on Redo.</param>
        public ObjectAction(object obj, MethodInfo methodUndo, MethodInfo methodRedo, object[] paramsUndo, object[] paramsRedo) : this(obj, methodUndo, methodRedo)
        {
            ParametersUndo.AddRange(paramsUndo);
            ParametersRedo.AddRange(paramsRedo);
        }
        /// <summary>
        /// Creates a new Instance of Object Action.
        /// </summary>
        /// <param name="obj">The Objects that contains the methodes to call.</param>
        /// <param name="methodUndo">The Delegate of the methode to call on Undo.</param>
        /// <param name="methodRedo">The Delegate of the methode to call on Redo.</param>
        public ObjectAction(object obj, Delegate methodUndo, Delegate methodRedo)
        {
            Object = obj;
            MethodUndo = methodUndo.Method;
            MethodRedo = methodRedo.Method;
        }
        /// <summary>
        /// Creates a new Instance of Object Action.
        /// </summary>
        /// <param name="obj">The Objects that contains the methodes to call.</param>
        /// <param name="methodUndo">The Delegate of the methode to call on Undo.</param>
        /// <param name="methodRedo">The Delegate of the methode to call on Redo.</param>
        /// <param name="paramsUndo">The parameters for calling the methode on Undo.</param>
        /// <param name="paramsRedo">The parameters for calling the methode on Redo.</param>
        public ObjectAction(object obj, Delegate methodUndo, Delegate methodRedo, object[] paramsUndo, object[] paramsRedo) : this(obj, methodUndo, methodRedo)
        {
            ParametersUndo.AddRange(paramsUndo);
            ParametersRedo.AddRange(paramsRedo);
        }
        /// <summary>
        /// Creates a new Instance of Object Action.
        /// </summary>
        /// <param name="obj">The Objects that contains the methodes to call.</param>
        /// <param name="methodUndo">The Action of the methode to call on Undo.</param>
        /// <param name="methodRedo">The Action of the methode to call on Redo.</param>
        public ObjectAction(object obj, Action methodUndo, Action methodRedo)
        {
            Object = obj;
            MethodUndo = methodUndo.Method;
            MethodRedo = methodRedo.Method;
        }

        private BindingFlags GetFlags(BindingFlags flags)
        {
            if (flags == BindingFlags.Default)
            {
                flags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
            }

            return flags;
        }

        internal void Undo()
        {
            CheckIfObjIsNothing(MethodUndo);
            MethodUndo?.Invoke(Object, ParametersUndo.ToArray());
        }

        internal void Redo()
        {
            CheckIfObjIsNothing(MethodRedo);
            MethodRedo?.Invoke(Object, ParametersRedo.ToArray());
        }

        private void CheckIfObjIsNothing(MethodInfo mi)
        {
            if (mi is object && !mi.IsStatic && AutogenerateObject)
            {
                if ((Object is null || Object.GetType() != mi.ReflectedType) && !mi.IsStatic)
                {
                    var constructor = mi.ReflectedType.GetConstructor(Type.EmptyTypes);
                    var classObject = constructor.Invoke(Array.Empty<object>());
                    Object = classObject;
                }
            }
        }
    }
}