using System.Collections.Generic;
using System.Net;
using Gallium;
using Nitride.Contents;

namespace Nitride.Html
{
    /// <summary>
    /// Converts the text input that uses HTML entities and turns them into
    /// Unicode variations.
    /// </summary>
    public class HtmlEntitiesToUnicode : NitrideOperationBase
    {
        /// <inheritdoc />
        public override IEnumerable<Entity> Run(IEnumerable<Entity> input)
        {
            return input
                .ForEachEntity<ITextContent>(this.ResolveHtmlEntities);
        }

        private Entity ResolveHtmlEntities(
            Entity entity,
            ITextContent content)
        {
            string text = content.GetText();
            string resolved = WebUtility.HtmlDecode(text);

            return entity.SetTextContent(resolved);
        }
    }
}