/// <summary>
/// Forces a facial expression on the girl.
/// </summary>
/// <param name="girl">The <see cref="Girl"/> instance on which to set the expression on.</param>
/// <param name="expressionType">The type of expression to set.</param>
/// <param name="changeEyes">When <c>true</c>, also set the girl's eyes to the one that belongs to the specified expression.</param>
/// <param name="changeMouth">When <c>true</c>, also set the girl's mouth to the one that belongs to the specified expression.</param>
/// <remarks>
/// The girl's eyebrows and face/blush are always set.
/// When the specified expression is not found, the girl's <see cref="GirlDefinition.defaultExpression"/> will be used.
/// </remarks>
public static void ForceExpression(this Girl girl, GirlExpressionType expressionType, bool changeEyes = true, bool changeMouth = true)
{
if (girl.definition == null)
{
throw new InvalidOperationException($"{nameof(girl)}.{nameof(girl.definition)} is null");
}
int index = girl.definition.pieces.FindIndex(p => p.type == GirlPieceType.EXPRESSION && p.expressionType == expressionType);
if (index == -1)
{
index = girl.definition.defaultExpression;
}
girl.ForceExpression(index, changeEyes, changeMouth);
}
