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

using System.Runtime.CompilerServices;

namespace SixLabors.Fonts.Unicode {
  /// <summary>
  /// Represents the Unicode Bidi value of a given <see cref="CodePoint"/>.
  /// <see href="https://unicode.org/reports/tr9/#Table"/>
  /// </summary>
  public readonly struct BidiClass
  {
      private readonly uint bidiValue;

      /// <summary>
      /// Initializes a new instance of the <see cref="BidiClass"/> struct.
      /// </summary>
      /// <param name="codePoint">The codepoint.</param>
      public BidiClass(CodePoint codePoint)
          => this.bidiValue = UnicodeData.GetBidiData((uint)codePoint.Value);

      /// <summary>
      /// Gets the Unicode Bidirectional character type.
      /// </summary>
      public BidiCharacterType CharacterType
          => (BidiCharacterType)(this.bidiValue >> 24);

      /// <summary>
      /// Gets the Unicode Bidirectional paired bracket type.
      /// </summary>
      public BidiPairedBracketType PairedBracketType
          => (BidiPairedBracketType)((this.bidiValue >> 16) & 0xFF);

      /// <summary>
      /// Gets the codepoint representing the bracket pairing for this instance.
      /// </summary>
      /// <param name="codePoint">
      /// When this method returns, contains the codepoint representing the bracket pairing for this instance;
      /// otherwise, the default value for the type of the <paramref name="codePoint"/> parameter.
      /// This parameter is passed uninitialized.
      /// .</param>
      /// <returns><see langword="true"/> if this instance has a bracket pairing; otherwise, <see langword="false"/></returns>
      [MethodImpl(MethodImplOptions.AggressiveInlining)]
      public bool TryGetPairedBracket(out CodePoint codePoint)
      {
          if (this.PairedBracketType == BidiPairedBracketType.None)
          {
              codePoint = default;
              return false;
          }

          codePoint = new CodePoint(this.bidiValue & 0xFFFF);
          return true;
      }
  }
}