54 lines
2.0 KiB
C#
54 lines
2.0 KiB
C#
namespace NeonSprawl.Server.Game.PositionState;
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/// <summary>Pure movement validation for <see cref="MoveCommandRequest"/> targets (NS-19).</summary>
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/// <remarks>
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/// <para><b>Precedence</b> when multiple rules fail: <see cref="MoveCommandReasonCodes.HorizontalStepExceeded"/>,
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/// then <see cref="MoveCommandReasonCodes.VerticalStepExceeded"/>, then <see cref="MoveCommandReasonCodes.OutOfBounds"/>.</para>
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/// <para>Vertical uses <c>abs(ΔY)</c>, so <b>descending</b> (target Y lower than current) is allowed when the
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/// drop is within <see cref="MovementValidationOptions.MaxVerticalStep"/> — same as climbing.</para>
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/// </remarks>
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public static class MoveCommandValidation
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{
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/// <summary>Returns false and sets <paramref name="reasonCode"/> when the move must be rejected.</summary>
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public static bool TryValidate(
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in PositionSnapshot from,
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PositionVector to,
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MovementValidationOptions rules,
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out string reasonCode)
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{
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reasonCode = "";
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if (rules.HorizontalStepEnabled)
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{
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var dx = to.X - from.X;
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var dz = to.Z - from.Z;
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var horizontal = Math.Sqrt((dx * dx) + (dz * dz));
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if (horizontal > rules.MaxHorizontalStep)
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{
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reasonCode = MoveCommandReasonCodes.HorizontalStepExceeded;
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return false;
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}
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}
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var dy = Math.Abs(to.Y - from.Y);
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if (dy > rules.MaxVerticalStep)
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{
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reasonCode = MoveCommandReasonCodes.VerticalStepExceeded;
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return false;
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}
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if (rules.DistrictBoundsEnabled)
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{
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if (to.X < rules.DistrictMinX || to.X > rules.DistrictMaxX ||
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to.Y < rules.DistrictMinY || to.Y > rules.DistrictMaxY ||
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to.Z < rules.DistrictMinZ || to.Z > rules.DistrictMaxZ)
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{
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reasonCode = MoveCommandReasonCodes.OutOfBounds;
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return false;
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}
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}
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return true;
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}
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}
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