using System.Collections.Generic;

namespace WasmBox.Pixie.Markup {
    /// <summary>
    /// A markup node that inserts whitespace around its body.
    /// </summary>
    public sealed class Paragraph : ContainerNode {
        /// <summary>
        /// Creates a paragraph from a body node.
        /// </summary>
        /// <param name="contents">A node to insulate in whitespace.</param>
        public Paragraph(MarkupNode contents)
            : base(contents) { }

        /// <summary>
        /// Creates a paragraph from a sequence of body nodes.
        /// </summary>
        /// <param name="contents">A list of nodes to insulate in whitespace.</param>
        public Paragraph(IReadOnlyList<MarkupNode> contents)
            : base(contents) { }

        /// <summary>
        /// Creates a paragraph from a sequence of body nodes.
        /// </summary>
        /// <param name="contents">A list of nodes to insulate in whitespace.</param>
        public Paragraph(params MarkupNode[] contents)
            : base(contents) { }

        /// <inheritdoc/>
        public override MarkupNode Fallback =>
            new Sequence(NewLine.Instance, Contents, NewLine.Instance);

        /// <inheritdoc/>
        public override ContainerNode WithContents(MarkupNode newContents) {
            return new Paragraph(newContents);
        }
    }

    /// <summary>
    /// A markup node that visually separates its body from
    /// other markup nodes by putting its body on different
    /// lines from the box' successors and predecessors.
    /// </summary>
    public sealed class Box : ContainerNode {
        /// <summary>
        /// Creates a box from a body node.
        /// </summary>
        /// <param name="contents">A node to insulate.</param>
        public Box(MarkupNode contents)
            : base(contents) { }

        /// <inheritdoc/>
        public override MarkupNode Fallback =>
            new Sequence(NewLine.Instance, Contents, NewLine.Instance);

        /// <inheritdoc/>
        public override ContainerNode WithContents(MarkupNode newContents) {
            return new Box(newContents);
        }
    }
}