using System.Numerics;
using Content.Shared.Inventory;
using Content.Shared.Movement.Systems;

namespace Content.Shared.Camera;

/// <summary>
///     Raised directed by-ref when <see cref="SharedContentEyeSystem.UpdateEyeOffset"/> is called.
///     Should be subscribed to by any systems that want to modify an entity's eye offset,
///     so that they do not override each other.
/// </summary>
/// <param name="Offset">
///     The total offset to apply.
/// </param>
/// <remarks>
///     Note that in most cases <see cref="Offset"/> should be incremented or decremented by subscribers, not set.
///     Otherwise, any offsets applied by previous subscribing systems will be overridden.
/// </remarks>
[ByRefEvent]
public record struct GetEyeOffsetEvent(Vector2 Offset);

/// <summary>
///     Raised before the <see cref="GetEyeOffsetEvent"/> and <see cref="GetEyeOffsetRelayedEvent"/>, to check if any of the subscribed
///     systems want to cancel offset changes.
/// </summary>
[ByRefEvent]
public record struct GetEyeOffsetAttemptEvent(bool Cancelled);

/// <summary>
///     Raised on any equipped and in-hand items that may modify the eye offset.
///     Pockets and suitstorage are excluded.
/// </summary>
[ByRefEvent]
public sealed class GetEyeOffsetRelayedEvent : EntityEventArgs, IInventoryRelayEvent
{
    public SlotFlags TargetSlots { get; } = ~(SlotFlags.POCKET & SlotFlags.SUITSTORAGE);

    public Vector2 Offset;
}