using System.Xml;
using FluentNHibernate.Utils;
using FluentNHibernate.Visitors;

namespace FluentNHibernate.MappingModel.Output
{
    public class XmlNaturalIdWriter : NullMappingModelVisitor, IXmlWriter<NaturalIdMapping>
    {
        private IXmlWriterServiceLocator serviceLocator;
        private XmlDocument document;

        public XmlNaturalIdWriter(IXmlWriterServiceLocator serviceLocator)
        {
            this.serviceLocator = serviceLocator;
        }

        public XmlDocument Write(NaturalIdMapping mappingModel)
        {
            document = null;
            mappingModel.AcceptVisitor(this);
            return document;
        }

        public override void ProcessNaturalId(NaturalIdMapping mapping)
        {
            document = new XmlDocument();

            var element = document.AddElement("natural-id");

            if (mapping.HasValue(x => x.Mutable))
                element.WithAtt("mutable", mapping.Mutable);
        }

        public override void Visit(PropertyMapping mapping)
        {
            var writer = serviceLocator.GetWriter<PropertyMapping>();
            var xml = writer.Write(mapping);

            document.ImportAndAppendChild(xml);
        }

        public override void Visit(ManyToOneMapping mapping)
        {
            var writer = serviceLocator.GetWriter<ManyToOneMapping>();
            var xml = writer.Write(mapping);

            document.ImportAndAppendChild(xml);
        }
    }
}
