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namespace QuantumConcepts.Formats.StereoLithography
    /// <summary>General STL extendsions for working with facets and vertices.</summary>
    public static class Extensions
        /// <summary>Shifts the vertices within the <paramref name="facets"/> enumerable by <paramref name="x"/>, <paramref name="y"/> and <paramref name="z"/>.</summary>
        /// <param name="facets">The vertices within these facets will be shifted.</param>
        /// <param name="x">The amount to shift the vertices along the X axis.</param>
        /// <param name="y">The amount to shift the vertices along the Y axis.</param>
        /// <param name="z">The amount to shift the vertices along the Z axis.</param>
        public static void Shift(this IEnumerable<Facet> facets, float x, float y, float z)
            facets.Shift(new Vertex(x, y, z));
        /// <summary>Shifts the vertices within the <paramref name="facets"/> enumerable by the X, Y and Z values in the <paramref name="shift"/> parameter.</summary>
        /// <param name="facets">The vertices to be shifted.</param>
        /// <param name="shift">The amount to shift each vertex.</param>
        public static void Shift(this IEnumerable<Facet> facets, Vertex shift)
            facets.ForEach(f => f.Shift(shift));
        /// <summary>Shifts the <paramref name="vertices"/> enumerable by <paramref name="x"/>, <paramref name="y"/> and <paramref name="z"/>.</summary>
        /// <param name="vertices">The vertices to be shifted.</param>
        /// <param name="x">The amount to shift the vertices along the X axis.</param>
        /// <param name="y">The amount to shift the vertices along the Y axis.</param>
        /// <param name="z">The amount to shift the vertices along the Z axis.</param>
        public static void Shift(this IEnumerable<Vertex> vertices, float x, float y, float z)
            vertices.Shift(new Vertex(x, y, z));
        /// <summary>Shifts the <paramref name="vertices"/> enumerable by the X, Y and Z values in the <paramref name="shift"/> parameter.</summary>
        /// <param name="vertices">The vertices to be shifted.</param>
        /// <param name="shift">The amount to shift each vertex.</param>
        public static void Shift(this IEnumerable<Vertex> vertices, Vertex shift)
            vertices.ForEach(v => v.Shift(shift));
        /// <summary>Inverts the <see cref="Normal"/> within the <paramref name="facets"/> enumerable.</summary>
        /// <param name="facets">The facets to invert.</param>
        public static void Invert(this IEnumerable<Facet> facets)
            facets.ForEach(f => f?.Normal?.Invert());
        /// <summary>Iterates the provided enumerable, applying the provided action to each element.</summary>
        /// <param name="items">The items upon which to apply the action.</param>
        /// <param name="action">The action to apply to each item.</param>
        public static void ForEach<T>(this IEnumerable<T> items, Action<T> action)
            if (items != null)
                foreach (var item in items)
                    action(item);
        /// <summary>Iterates the provided enumerable, applying the provided action to each element.</summary>
        /// <param name="items">The items upon which to apply the action.</param>
        /// <param name="predicate">The action to apply to each item.</param>
        public static bool All<T>(this IEnumerable<T> items, Func<int, T, bool> predicate)
            if (items != null)
                var index = 0;
                foreach (var item in items)
                    if (!predicate(index, item))
                        return false;
                    index++;
            return true;
        /// <summary>Checks if the provided value is null or empty.</summary>
        /// <param name="value">The value to check.</param>
        /// <returns>True if the provided value is null or empty.</returns>
        public static bool IsNullOrEmpty(this string value)
            return string.IsNullOrEmpty(value);
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