HX-PGS-AIM-IOS/Library/PackageCache/com.unity.inputsystem/InputSystem/Actions/InputActionTrace.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Text;
using Unity.Collections.LowLevel.Unsafe;
using UnityEngine.InputSystem.LowLevel;

////REVIEW: why not switch to this being the default mechanism? seems like this could allow us to also solve
////        the actions-update-when-not-expected problem; plus give us access to easy polling

////REVIEW: should this automatically unsubscribe itself on disposal?

////TODO: make it possible to persist this same way that it should be possible to persist InputEventTrace

////TODO: make this one thread-safe

////TODO: add random access capability

////TODO: protect traces against controls changing configuration (if state layouts change, we're affected)

namespace UnityEngine.InputSystem.Utilities
{
    /// <summary>
    /// Records the triggering of actions into a sequence of events that can be replayed at will.
    /// </summary>
    /// <remarks>
    /// This is an alternate way to the callback-based responses (such as <see cref="InputAction.performed"/>)
    /// of <see cref="InputAction">input actions</see>. Instead of executing response code right away whenever
    /// an action triggers, an <see cref="RecordAction">event is recorded</see> which can then be queried on demand.
    ///
    /// The recorded data will stay valid even if the bindings on the actions are changed (e.g. by enabling a different
    /// set of bindings through altering <see cref="InputAction.bindingMask"/> or <see cref="InputActionMap.devices"/> or
    /// when modifying the paths of bindings altogether). Note, however, that when this happens, a trace will have
    /// to make a private copy of the data that stores the binding resolution state. This means that there can be
    /// GC allocation spike when reconfiguring actions that have recorded data in traces.
    ///
    /// <example>
    /// <code>
    /// var trace = new InputActionTrace();
    ///
    /// // Subscribe trace to single action.
    /// // (Use UnsubscribeFrom to unsubscribe)
    /// trace.SubscribeTo(myAction);
    ///
    /// // Subscribe trace to entire action map.
    /// // (Use UnsubscribeFrom to unsubscribe)
    /// trace.SubscribeTo(myActionMap);
    ///
    /// // Subscribe trace to all actions in the system.
    /// trace.SubscribeToAll();
    ///
    /// // Record a single triggering of an action.
    /// myAction.performed +=
    ///     ctx =>
    ///     {
    ///         if (ctx.ReadValue&lt;float&gt;() &gt; 0.5f)
    ///             trace.RecordAction(ctx);
    ///     };
    ///
    /// // Output trace to console.
    /// Debug.Log(string.Join(",\n", trace));
    ///
    /// // Walk through all recorded actions and then clear trace.
    /// foreach (var record in trace)
    /// {
    ///     Debug.Log($"{record.action} was {record.phase} by control {record.control} at {record.time}");
    ///
    ///     // To read out the value, you either have to know the value type or read the
    ///     // value out as a generic byte buffer. Here we assume that the value type is
    ///     // float.
    ///
    ///     Debug.Log("Value: " + record.ReadValue&lt;float&gt;());
    ///
    ///     // An alternative is read the value as an object. In this case, you don't have
    ///     // to know the value type but there will be a boxed object allocation.
    ///     Debug.Log("Value: " + record.ReadValueAsObject());
    /// }
    /// trace.Clear();
    ///
    /// // Unsubscribe trace from everything.
    /// trace.UnsubscribeFromAll();
    ///
    /// // Release memory held by trace.
    /// trace.Dispose();
    /// </code>
    /// </example>
    /// </remarks>
    /// <seealso cref="InputAction.started"/>
    /// <seealso cref="InputAction.performed"/>
    /// <seealso cref="InputAction.canceled"/>
    /// <seealso cref="InputSystem.onActionChange"/>
    public sealed class InputActionTrace : IEnumerable<InputActionTrace.ActionEventPtr>, IDisposable
    {
        ////REVIEW: this is of limited use without having access to ActionEvent
        /// <summary>
        /// Directly access the underlying raw memory queue.
        /// </summary>
        public InputEventBuffer buffer => m_EventBuffer;

        /// <summary>
        /// Returns the number of events in the associated event buffer.
        /// </summary>
        public int count => m_EventBuffer.eventCount;

        /// <summary>
        /// Constructs a new default initialized <c>InputActionTrace</c>.
        /// </summary>
        /// <remarks>
        /// When you use this constructor, the new InputActionTrace object does not start recording any actions.
        /// To record actions, you must explicitly set them up after creating the object.
        /// Alternatively, you can use one of the other constructor overloads which begin recording actions immediately.
        /// </remarks>
        /// <seealso cref="SubscribeTo(InputAction)"/>
        /// <seealso cref="SubscribeTo(InputActionMap)"/>
        /// <seealso cref="SubscribeToAll"/>
        public InputActionTrace()
        {
        }

        /// <summary>
        /// Constructs a new <c>InputActionTrace</c> that records <paramref name="action"/>.
        /// </summary>
        /// <param name="action">The action to be recorded.</param>
        /// <exception cref="System.ArgumentNullException">Thrown if <paramref name="action"/> is <c>null</c>.</exception>
        public InputActionTrace(InputAction action)
        {
            if (action == null)
                throw new ArgumentNullException(nameof(action));
            SubscribeTo(action);
        }

        /// <summary>
        /// Constructs a new <c>InputActionTrace</c> that records all actions in <paramref name="actionMap"/>.
        /// </summary>
        /// <param name="actionMap">The action-map containing actions to be recorded.</param>
        /// <exception cref="System.ArgumentNullException">Thrown if <paramref name="action"/> is <c>null</c>.</exception>
        public InputActionTrace(InputActionMap actionMap)
        {
            if (actionMap == null)
                throw new ArgumentNullException(nameof(actionMap));
            SubscribeTo(actionMap);
        }

        /// <summary>
        /// Record any action getting triggered anywhere.
        /// </summary>
        /// <remarks>
        /// This does not require the trace to actually hook into every single action or action map in the system.
        /// Instead, the trace will listen to <see cref="InputSystem.onActionChange"/> and automatically record
        /// every triggered action.
        /// </remarks>
        /// <seealso cref="SubscribeTo(InputAction)"/>
        /// <seealso cref="SubscribeTo(InputActionMap)"/>
        public void SubscribeToAll()
        {
            if (m_SubscribedToAll)
                return;

            HookOnActionChange();
            m_SubscribedToAll = true;

            // Remove manually created subscriptions.
            while (m_SubscribedActions.length > 0)
                UnsubscribeFrom(m_SubscribedActions[m_SubscribedActions.length - 1]);
            while (m_SubscribedActionMaps.length > 0)
                UnsubscribeFrom(m_SubscribedActionMaps[m_SubscribedActionMaps.length - 1]);
        }

        /// <summary>
        /// Unsubscribes from all actions currently being recorded.
        /// </summary>
        /// <seealso cref="UnsubscribeFrom(InputAction)"/>
        /// <seealso cref="UnsubscribeFrom(InputActionMap)"/>
        public void UnsubscribeFromAll()
        {
            // Only unhook from OnActionChange if we don't have any recorded actions. If we do have
            // any, we still need the callback to be notified about when binding data changes.
            if (count == 0)
                UnhookOnActionChange();

            m_SubscribedToAll = false;

            while (m_SubscribedActions.length > 0)
                UnsubscribeFrom(m_SubscribedActions[m_SubscribedActions.length - 1]);
            while (m_SubscribedActionMaps.length > 0)
                UnsubscribeFrom(m_SubscribedActionMaps[m_SubscribedActionMaps.length - 1]);
        }

        /// <summary>
        /// Subscribes to <paramref name="action"/>.
        /// </summary>
        /// <param name="action">The action to be recorded.</param>
        /// <remarks>
        /// **Note:** This method does not prevent you from subscribing to the same action multiple times.
        /// If you subscribe to the same action multiple times, your event buffer will contain duplicate entries.
        /// </remarks>
        /// <exception cref="ArgumentNullException">If <paramref name="action"/> is <c>null</c>.</exception>
        /// <seealso cref="SubscribeTo(InputActionMap)"/>
        /// <seealso cref="SubscribeToAll"/>
        public void SubscribeTo(InputAction action)
        {
            if (action == null)
                throw new ArgumentNullException(nameof(action));

            if (m_CallbackDelegate == null)
                m_CallbackDelegate = RecordAction;

            action.performed += m_CallbackDelegate;
            action.started += m_CallbackDelegate;
            action.canceled += m_CallbackDelegate;

            m_SubscribedActions.AppendWithCapacity(action);
        }

        /// <summary>
        /// Subscribes to all actions contained within <paramref name="actionMap"/>.
        /// </summary>
        /// <param name="actionMap">The action-map containing all actions to be recorded.</param>
        /// <remarks>
        /// **Note:** This method does not prevent you from subscribing to the same action multiple times.
        /// If you subscribe to the same action multiple times, your event buffer will contain duplicate entries.
        /// </remarks>
        /// <exception cref="ArgumentNullException">Thrown if <paramref name="actionMap"/> is null.</exception>
        /// <seealso cref="SubscribeTo(InputAction)"/>
        /// <seealso cref="SubscribeToAll"/>
        public void SubscribeTo(InputActionMap actionMap)
        {
            if (actionMap == null)
                throw new ArgumentNullException(nameof(actionMap));

            if (m_CallbackDelegate == null)
                m_CallbackDelegate = RecordAction;

            actionMap.actionTriggered += m_CallbackDelegate;

            m_SubscribedActionMaps.AppendWithCapacity(actionMap);
        }

        /// <summary>
        /// Unsubscribes from an action, if that action was previously subscribed to.
        /// </summary>
        /// <param name="action">The action to unsubscribe from.</param>
        /// <remarks>
        /// **Note:** This method has no side effects if you attempt to unsubscribe from an action that you have not previously subscribed to.
        /// </remarks>
        /// <exception cref="ArgumentNullException">Thrown if <paramref name="action"/> is <c>null</c>.</exception>
        /// <seealso cref="UnsubscribeFrom(InputActionMap)"/>
        /// <seealso cref="UnsubscribeFromAll"/>
        public void UnsubscribeFrom(InputAction action)
        {
            if (action == null)
                throw new ArgumentNullException(nameof(action));

            if (m_CallbackDelegate == null)
                return;

            action.performed -= m_CallbackDelegate;
            action.started -= m_CallbackDelegate;
            action.canceled -= m_CallbackDelegate;

            var index = m_SubscribedActions.IndexOfReference(action);
            if (index != -1)
                m_SubscribedActions.RemoveAtWithCapacity(index);
        }

        /// <summary>
        /// Unsubscribes from all actions included in <paramref name="actionMap"/>.
        /// </summary>
        /// <param name="actionMap">The action-map containing actions to unsubscribe from.</param>
        /// <remarks>
        /// **Note:** This method has no side effects if you attempt to unsubscribe from an action-map that you have not previously subscribed to.
        /// </remarks>
        /// <exception cref="ArgumentNullException">Thrown if <paramref name="actionMap"/> is <c>null</c>.</exception>
        /// <seealso cref="UnsubscribeFrom(InputAction)"/>
        /// <seealso cref="UnsubscribeFromAll"/>
        public void UnsubscribeFrom(InputActionMap actionMap)
        {
            if (actionMap == null)
                throw new ArgumentNullException(nameof(actionMap));

            if (m_CallbackDelegate == null)
                return;

            actionMap.actionTriggered -= m_CallbackDelegate;

            var index = m_SubscribedActionMaps.IndexOfReference(actionMap);
            if (index != -1)
                m_SubscribedActionMaps.RemoveAtWithCapacity(index);
        }

        /// <summary>
        /// Record the triggering of an action as an <see cref="ActionEventPtr">action event</see>.
        /// </summary>
        /// <param name="context"></param>
        /// <see cref="InputAction.performed"/>
        /// <see cref="InputAction.started"/>
        /// <see cref="InputAction.canceled"/>
        /// <see cref="InputActionMap.actionTriggered"/>
        public unsafe void RecordAction(InputAction.CallbackContext context)
        {
            // Find/add state.
            var stateIndex = m_ActionMapStates.IndexOfReference(context.m_State);
            if (stateIndex == -1)
                stateIndex = m_ActionMapStates.AppendWithCapacity(context.m_State);

            // Make sure we get notified if there's a change to binding setups.
            HookOnActionChange();

            // Allocate event.
            var valueSizeInBytes = context.valueSizeInBytes;
            var eventPtr =
                (ActionEvent*)m_EventBuffer.AllocateEvent(ActionEvent.GetEventSizeWithValueSize(valueSizeInBytes));

            // Initialize event.
            ref var triggerState = ref context.m_State.actionStates[context.m_ActionIndex];
            eventPtr->baseEvent.type = ActionEvent.Type;
            eventPtr->baseEvent.time = triggerState.time;
            eventPtr->stateIndex = stateIndex;
            eventPtr->controlIndex = triggerState.controlIndex;
            eventPtr->bindingIndex = triggerState.bindingIndex;
            eventPtr->interactionIndex = triggerState.interactionIndex;
            eventPtr->startTime = triggerState.startTime;
            eventPtr->phase = triggerState.phase;

            // Store value.
            // NOTE: If the action triggered from a composite, this stores the value as
            //       read from the composite.
            // NOTE: Also, the value we store is a fully processed value.
            var valueBuffer = eventPtr->valueData;
            context.ReadValue(valueBuffer, valueSizeInBytes);
        }

        /// <summary>
        /// Clears all recorded data.
        /// </summary>
        /// <remarks>
        /// **Note:** This method does not unsubscribe any actions that the instance is listening to, so after clearing the recorded data, new input on those subscribed actions will continue to be recorded.
        /// </remarks>
        public void Clear()
        {
            m_EventBuffer.Reset();
            m_ActionMapStates.ClearWithCapacity();
        }

        ~InputActionTrace()
        {
            DisposeInternal();
        }

        /// <inheritdoc/>
        public override string ToString()
        {
            if (count == 0)
                return "[]";

            var str = new StringBuilder();
            str.Append('[');
            var isFirst = true;
            foreach (var eventPtr in this)
            {
                if (!isFirst)
                    str.Append(",\n");
                str.Append(eventPtr.ToString());
                isFirst = false;
            }
            str.Append(']');
            return str.ToString();
        }

        /// <inheritdoc/>
        public void Dispose()
        {
            UnsubscribeFromAll();
            DisposeInternal();
        }

        private void DisposeInternal()
        {
            // Nuke clones we made of InputActionMapStates.
            for (var i = 0; i < m_ActionMapStateClones.length; ++i)
                m_ActionMapStateClones[i].Dispose();

            m_EventBuffer.Dispose();
            m_ActionMapStates.Clear();
            m_ActionMapStateClones.Clear();

            if (m_ActionChangeDelegate != null)
            {
                InputSystem.onActionChange -= m_ActionChangeDelegate;
                m_ActionChangeDelegate = null;
            }
        }

        /// <summary>
        /// Returns an enumerator that enumerates all action events recorded for this instance.
        /// </summary>
        /// <returns>Enumerator instance, never <c>null</c>.</returns>
        /// <seealso cref="ActionEventPtr"/>
        public IEnumerator<ActionEventPtr> GetEnumerator()
        {
            return new Enumerator(this);
        }

        IEnumerator IEnumerable.GetEnumerator()
        {
            return GetEnumerator();
        }

        private bool m_SubscribedToAll;
        private bool m_OnActionChangeHooked;
        private InlinedArray<InputAction> m_SubscribedActions;
        private InlinedArray<InputActionMap> m_SubscribedActionMaps;
        private InputEventBuffer m_EventBuffer;
        private InlinedArray<InputActionState> m_ActionMapStates;
        private InlinedArray<InputActionState> m_ActionMapStateClones;
        private Action<InputAction.CallbackContext> m_CallbackDelegate;
        private Action<object, InputActionChange> m_ActionChangeDelegate;

        private void HookOnActionChange()
        {
            if (m_OnActionChangeHooked)
                return;

            if (m_ActionChangeDelegate == null)
                m_ActionChangeDelegate = OnActionChange;

            InputSystem.onActionChange += m_ActionChangeDelegate;
            m_OnActionChangeHooked = true;
        }

        private void UnhookOnActionChange()
        {
            if (!m_OnActionChangeHooked)
                return;

            InputSystem.onActionChange -= m_ActionChangeDelegate;
            m_OnActionChangeHooked = false;
        }

        private void OnActionChange(object actionOrMapOrAsset, InputActionChange change)
        {
            // If we're subscribed to all actions, check if an action got triggered.
            if (m_SubscribedToAll)
            {
                switch (change)
                {
                    case InputActionChange.ActionStarted:
                    case InputActionChange.ActionPerformed:
                    case InputActionChange.ActionCanceled:
                        Debug.Assert(actionOrMapOrAsset is InputAction, "Expected an action");
                        var triggeredAction = (InputAction)actionOrMapOrAsset;
                        var actionIndex = triggeredAction.m_ActionIndexInState;
                        var stateForAction = triggeredAction.m_ActionMap.m_State;

                        var context = new InputAction.CallbackContext
                        {
                            m_State = stateForAction,
                            m_ActionIndex = actionIndex,
                        };

                        RecordAction(context);

                        return;
                }
            }

            // We're only interested in changes to the binding resolution state of actions.
            if (change != InputActionChange.BoundControlsAboutToChange)
                return;

            // Grab the associated action map(s).
            if (actionOrMapOrAsset is InputAction action)
                CloneActionStateBeforeBindingsChange(action.m_ActionMap);
            else if (actionOrMapOrAsset is InputActionMap actionMap)
                CloneActionStateBeforeBindingsChange(actionMap);
            else if (actionOrMapOrAsset is InputActionAsset actionAsset)
                foreach (var actionMapInAsset in actionAsset.actionMaps)
                    CloneActionStateBeforeBindingsChange(actionMapInAsset);
            else
                Debug.Assert(false, "Expected InputAction, InputActionMap or InputActionAsset");
        }

        private void CloneActionStateBeforeBindingsChange(InputActionMap actionMap)
        {
            // Grab the state.
            var state = actionMap.m_State;
            if (state == null)
            {
                // Bindings have not been resolved yet for this action map. We shouldn't even be
                // on the notification list in this case, but just in case, ignore.
                return;
            }

            // See if we're using the given state.
            var stateIndex = m_ActionMapStates.IndexOfReference(state);
            if (stateIndex == -1)
                return;

            // Yes, we are so make our own private copy of its current state.
            // NOTE: We do not put these local InputActionMapStates on the global list.
            var clone = state.Clone();
            m_ActionMapStateClones.Append(clone);
            m_ActionMapStates[stateIndex] = clone;
        }

        /// <summary>
        /// A wrapper around <see cref="ActionEvent"/> that automatically translates all the
        /// information in events into their high-level representations.
        /// </summary>
        /// <remarks>
        /// For example, instead of returning <see cref="ActionEvent.controlIndex">control indices</see>,
        /// it automatically resolves and returns the respective <see cref="InputControl">controls</see>.
        /// </remarks>
        public unsafe struct ActionEventPtr
        {
            internal InputActionState m_State;
            internal ActionEvent* m_Ptr;

            /// <summary>
            /// The <see cref="InputAction"/> associated with this action event.
            /// </summary>
            public InputAction action => m_State.GetActionOrNull(m_Ptr->bindingIndex);

            /// <summary>
            /// The <see cref="InputActionPhase"/> associated with this action event.
            /// </summary>
            /// <seealso cref="InputAction.phase"/>
            /// <seealso cref="InputAction.CallbackContext.phase"/>
            public InputActionPhase phase => m_Ptr->phase;

            /// <summary>
            /// The <see cref="InputControl"/> instance associated with this action event.
            /// </summary>
            public InputControl control => m_State.controls[m_Ptr->controlIndex];

            /// <summary>
            /// The <see cref="IInputInteraction"/> instance associated with this action event if applicable, or <c>null</c> if the action event is not associated with an input interaction.
            /// </summary>
            public IInputInteraction interaction
            {
                get
                {
                    var index = m_Ptr->interactionIndex;
                    if (index == InputActionState.kInvalidIndex)
                        return null;

                    return m_State.interactions[index];
                }
            }

            /// <summary>
            /// The time, in seconds since your game or app started, that the event occurred.
            /// </summary>
            /// <remarks>
            /// Times are in seconds and progress linearly in real-time. The timeline is the same as for <see cref="Time.realtimeSinceStartup"/>.
            /// </remarks>
            public double time => m_Ptr->baseEvent.time;

            /// <summary>
            /// The time, in seconds since your game or app started, that the <see cref="phase"/> transitioned into <see cref="InputActionPhase.Started"/>.
            /// </summary>
            public double startTime => m_Ptr->startTime;

            /// <summary>
            /// The duration, in seconds, that has elapsed between when this event was generated and when the
            /// action <see cref="phase"/> transitioned to <see cref="InputActionPhase.Started"/> and has remained active.
            /// </summary>
            public double duration => time - startTime;

            /// <summary>
            /// The size, in bytes, of the value associated with this action event.
            /// </summary>
            public int valueSizeInBytes => m_Ptr->valueSizeInBytes;

            /// <summary>
            /// Reads the value associated with this event as an <c>object</c>.
            /// </summary>
            /// <returns><c>object</c> representing the value of this action event.</returns>
            /// <seealso cref="ReadOnlyArray{TValue}"/>
            /// <seealso cref="ReadValue(void*, int)"/>
            public object ReadValueAsObject()
            {
                if (m_Ptr == null)
                    throw new InvalidOperationException("ActionEventPtr is invalid");

                var valuePtr = m_Ptr->valueData;

                // Check if the value came from a composite.
                var bindingIndex = m_Ptr->bindingIndex;
                if (m_State.bindingStates[bindingIndex].isPartOfComposite)
                {
                    // Yes, so have to put the value/struct data we read into a boxed
                    // object based on the value type of the composite.

                    var compositeBindingIndex = m_State.bindingStates[bindingIndex].compositeOrCompositeBindingIndex;
                    var compositeIndex = m_State.bindingStates[compositeBindingIndex].compositeOrCompositeBindingIndex;
                    var composite = m_State.composites[compositeIndex];
                    Debug.Assert(composite != null, "NULL composite instance");

                    var valueType = composite.valueType;
                    if (valueType == null)
                        throw new InvalidOperationException($"Cannot read value from Composite '{composite}' which does not have a valueType set");

                    return Marshal.PtrToStructure(new IntPtr(valuePtr), valueType);
                }

                // Expecting action to only trigger from part bindings or bindings outside of composites.
                Debug.Assert(!m_State.bindingStates[bindingIndex].isComposite, "Action should not have triggered directly from a composite binding");

                // Read value through InputControl.
                var valueSizeInBytes = m_Ptr->valueSizeInBytes;
                return control.ReadValueFromBufferAsObject(valuePtr, valueSizeInBytes);
            }

            /// <summary>
            /// Reads the value associated with this event into the contiguous memory buffer defined by <c>[buffer, buffer + bufferSize)</c>.
            /// </summary>
            /// <param name="buffer">Pointer to the contiguous memory buffer to write value data to.</param>
            /// <param name="bufferSize">The size, in bytes, of the contiguous buffer pointed to by <paramref name="buffer"/>.</param>
            /// <exception cref="NullReferenceException">If <paramref name="buffer"/> is <c>null</c>.</exception>
            /// <exception cref="ArgumentException">If the given <paramref name="bufferSize"/> is less than the number of bytes required to write the event value to <paramref name="buffer"/>.</exception>
            /// <seealso cref="ReadValueAsObject"/>
            /// <seealso cref="ReadValue{TValue}"/>
            public void ReadValue(void* buffer, int bufferSize)
            {
                var valueSizeInBytes = m_Ptr->valueSizeInBytes;

                ////REVIEW: do we want more checking than this?
                if (bufferSize < valueSizeInBytes)
                    throw new ArgumentException(
                        $"Expected buffer of at least {valueSizeInBytes} bytes but got buffer of just {bufferSize} bytes instead",
                        nameof(bufferSize));

                UnsafeUtility.MemCpy(buffer, m_Ptr->valueData, valueSizeInBytes);
            }

            /// <summary>
            /// Reads the value associated with this event as an object of type <typeparamref name="TValue"/>.
            /// </summary>
            /// <typeparam name="TValue">The event value type to be used.</typeparam>
            /// <returns>Object of type <typeparamref name="TValue"/>.</returns>
            /// <exception cref="InvalidOperationException">In case the size of <typeparamref name="TValue"/> does not match the size of the value associated with this event.</exception>
            public TValue ReadValue<TValue>()
                where TValue : struct
            {
                var valueSizeInBytes = m_Ptr->valueSizeInBytes;

                ////REVIEW: do we want more checking than this?
                if (UnsafeUtility.SizeOf<TValue>() != valueSizeInBytes)
                    throw new InvalidOperationException(
                        $"Cannot read a value of type '{typeof(TValue).Name}' with size {UnsafeUtility.SizeOf<TValue>()} from event on action '{action}' with value size {valueSizeInBytes}");

                var result = new TValue();
                var resultPtr = UnsafeUtility.AddressOf(ref result);
                UnsafeUtility.MemCpy(resultPtr, m_Ptr->valueData, valueSizeInBytes);

                return result;
            }

            /// <inheritdoc/>
            public override string ToString()
            {
                if (m_Ptr == null)
                    return "<null>";

                var actionName = action.actionMap != null ? $"{action.actionMap.name}/{action.name}" : action.name;
                return $"{{ action={actionName} phase={phase} time={time} control={control} value={ReadValueAsObject()} interaction={interaction} duration={duration} }}";
            }
        }

        private unsafe struct Enumerator : IEnumerator<ActionEventPtr>
        {
            private readonly InputActionTrace m_Trace;
            private readonly ActionEvent* m_Buffer;
            private readonly int m_EventCount;
            private ActionEvent* m_CurrentEvent;
            private int m_CurrentIndex;

            public Enumerator(InputActionTrace trace)
            {
                m_Trace = trace;
                m_Buffer = (ActionEvent*)trace.m_EventBuffer.bufferPtr.data;
                m_EventCount = trace.m_EventBuffer.eventCount;
                m_CurrentEvent = null;
                m_CurrentIndex = 0;
            }

            public bool MoveNext()
            {
                if (m_CurrentIndex == m_EventCount)
                    return false;

                if (m_CurrentEvent == null)
                {
                    m_CurrentEvent = m_Buffer;
                    return m_CurrentEvent != null;
                }

                Debug.Assert(m_CurrentEvent != null);

                ++m_CurrentIndex;
                if (m_CurrentIndex == m_EventCount)
                    return false;

                m_CurrentEvent = (ActionEvent*)InputEvent.GetNextInMemory((InputEvent*)m_CurrentEvent);
                return true;
            }

            public void Reset()
            {
                m_CurrentEvent = null;
                m_CurrentIndex = 0;
            }

            public void Dispose()
            {
            }

            public ActionEventPtr Current
            {
                get
                {
                    var state = m_Trace.m_ActionMapStates[m_CurrentEvent->stateIndex];
                    return new ActionEventPtr
                    {
                        m_State = state,
                        m_Ptr = m_CurrentEvent,
                    };
                }
            }

            object IEnumerator.Current => Current;
        }
    }
}