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

using System;

namespace SixLabors.Fonts.Rendering {
  /// <summary>
  /// Encapsulates logic for laying out and then rendering text to a <see cref="IGlyphRenderer"/> surface.
  /// </summary>
  public class TextRenderer
  {
      private readonly IGlyphRenderer renderer;

      /// <summary>
      /// Initializes a new instance of the <see cref="TextRenderer"/> class.
      /// </summary>
      /// <param name="renderer">The renderer.</param>
      public TextRenderer(IGlyphRenderer renderer) => this.renderer = renderer;

      /// <summary>
      /// Renders the text to the <paramref name="renderer"/>.
      /// </summary>
      /// <param name="renderer">The target renderer.</param>
      /// <param name="text">The text to render.</param>
      /// <param name="options">The text options. <see cref="TextOptions.WrappingLength"/> controls wrapping; use <c>-1</c> to disable wrapping.</param>
      public static void RenderTextTo(IGlyphRenderer renderer, ReadOnlySpan<char> text, TextOptions options)
          => new TextRenderer(renderer).RenderText(text, options);

      /// <summary>
      /// Renders the text to the <paramref name="renderer"/>.
      /// </summary>
      /// <param name="renderer">The target renderer.</param>
      /// <param name="text">The text to render.</param>
      /// <param name="options">The text options. <see cref="TextOptions.WrappingLength"/> controls wrapping; use <c>-1</c> to disable wrapping.</param>
      public static void RenderTextTo(IGlyphRenderer renderer, string text, TextOptions options)
          => new TextRenderer(renderer).RenderText(text, options);

      /// <summary>
      /// Renders the text to the configured renderer.
      /// </summary>
      /// <param name="text">The text to render.</param>
      /// <param name="options">The text options. <see cref="TextOptions.WrappingLength"/> controls wrapping; use <c>-1</c> to disable wrapping.</param>
      public void RenderText(string text, TextOptions options)
          => this.RenderText(text.AsSpan(), options);

      /// <summary>
      /// Renders the text to the configured renderer.
      /// </summary>
      /// <param name="text">The text to render.</param>
      /// <param name="options">The text options. <see cref="TextOptions.WrappingLength"/> controls wrapping; use <c>-1</c> to disable wrapping.</param>
      public void RenderText(ReadOnlySpan<char> text, TextOptions options)
      {
          TextBlock block = new(text, options);
          block.RenderTo(this.renderer, options.WrappingLength);
      }
  }
}