// Copyright (c) Six Labors.
// Licensed under the Six Labors Split License.

using System;
using System.Collections.Generic;
using System.Globalization;

namespace SixLabors.Fonts {
  /// <summary>
  /// Provides a collection of fonts.
  /// </summary>
  public static class SystemFonts
  {
      private static readonly Lazy<SystemFontCollection> LazySystemFonts = new(() => new SystemFontCollection(), true);

      /// <summary>
      /// Gets the collection containing the globally installed system fonts.
      /// </summary>
      public static IReadOnlySystemFontCollection Collection => LazySystemFonts.Value;

      /// <summary>
      /// Gets the collection of <see cref="FontFamily"/>s installed on current system.
      /// </summary>
      public static IEnumerable<FontFamily> Families => Collection.Families;

      /// <inheritdoc cref="IReadOnlyFontCollection.Get(string)"/>
      public static FontFamily Get(string name) => GetByCulture(name, CultureInfo.InvariantCulture);

      /// <inheritdoc cref="IReadOnlyFontCollection.TryGet(string, out FontFamily)" />
      public static bool TryGet(string fontFamily, out FontFamily family)
          => Collection.TryGet(fontFamily, out family);

      /// <summary>
      /// Create a new instance of the <see cref="Font"/> for the named font family with regular styling.
      /// </summary>
      /// <param name="name">The font family name.</param>
      /// <param name="size">The size of the font in PT units.</param>
      /// <returns>The new <see cref="Font"/>.</returns>
      public static Font CreateFont(string name, float size)
          => Collection.Get(name).CreateFont(size);

      /// <summary>
      /// Create a new instance of the <see cref="Font"/> for the named font family.
      /// </summary>
      /// <param name="name">The font family name.</param>
      /// <param name="size">The size of the font in PT units.</param>
      /// <param name="style">The font style.</param>
      /// <returns>The new <see cref="Font"/>.</returns>
      public static Font CreateFont(string name, float size, FontStyle style)
          => Collection.Get(name).CreateFont(size, style);

      /// <inheritdoc cref="IReadOnlyFontCollection.GetByCulture(CultureInfo)"/>
      public static IEnumerable<FontFamily> GetByCulture(CultureInfo culture)
          => Collection.GetByCulture(culture);

      /// <inheritdoc cref="IReadOnlyFontCollection.GetByCulture(string, CultureInfo)" />
      public static FontFamily GetByCulture(string fontFamily, CultureInfo culture)
          => Collection.GetByCulture(fontFamily, culture);

      /// <inheritdoc cref="IReadOnlyFontCollection.TryGetByCulture(string, CultureInfo, out FontFamily)" />
      public static bool TryGetByCulture(string fontFamily, CultureInfo culture, out FontFamily family)
          => Collection.TryGetByCulture(fontFamily, culture, out family);

      /// <summary>
      /// Create a new instance of the <see cref="Font"/> for the named font family with regular styling.
      /// </summary>
      /// <param name="name">The font family name.</param>
      /// <param name="culture">The font culture.</param>
      /// <param name="size">The size of the font in PT units.</param>
      /// <returns>The new <see cref="Font"/>.</returns>
      public static Font CreateFont(string name, CultureInfo culture, float size)
          => Collection.GetByCulture(name, culture).CreateFont(size);

      /// <summary>
      /// Create a new instance of the <see cref="Font"/> for the named font family.
      /// </summary>
      /// <param name="name">The font family name.</param>
      /// <param name="culture">The font culture.</param>
      /// <param name="size">The size of the font in PT units.</param>
      /// <param name="style">The font style.</param>
      /// <returns>The new <see cref="Font"/>.</returns>
      public static Font CreateFont(string name, CultureInfo culture, float size, FontStyle style)
          => Collection.GetByCulture(name, culture).CreateFont(size, style);
  }
}