using System;
using System.Collections.Generic;
using Umbraco.Core.Models.PublishedContent;
using Umbraco.Core.Xml.XPath;

namespace Umbraco.Web.PublishedCache.NuCache.Navigable
{
    internal class NavigableContent : INavigableContent
    {
        private readonly PublishedContent _content;
        private readonly string[] _builtInValues;

        public NavigableContent(IPublishedContent content)
        {
            InnerContent = content;
            _content = PublishedContent.UnwrapIPublishedContent(InnerContent);

            var i = 0;
            _builtInValues = new []
                {
                    XmlString(i++, _content.Name),
                    XmlString(i++, _content.ParentId),
                    XmlString(i++, _content.CreateDate),
                    XmlString(i++, _content.UpdateDate),
                    XmlString(i++, true), // isDoc
                    XmlString(i++, _content.SortOrder),
                    XmlString(i++, _content.Level),
                    XmlString(i++, _content.TemplateId),
                    XmlString(i++, _content.WriterId),
                    XmlString(i++, _content.CreatorId),
                    XmlString(i++, _content.UrlSegment),
                    XmlString(i, _content.IsDraft)
                };
        }

        private string XmlString(int index, object value)
        {
            if (value == null) return string.Empty;
            var field = Type.FieldTypes[index];
            return field.XmlStringConverter == null ? value.ToString() : field.XmlStringConverter(value);
        }

        #region INavigableContent

        public IPublishedContent InnerContent { get; }

        public int Id => _content.Id;

        public int ParentId => _content.ParentId;

        public INavigableContentType Type => NavigableContentType.GetContentType(_content.ContentType);

        // returns all child ids, will be filtered by the source
        public IList<int> ChildIds => _content.ChildIds;

        public object Value(int index)
        {
            if (index < 0)
                throw new ArgumentOutOfRangeException(nameof(index));

            if (index < NavigableContentType.BuiltinProperties.Length)
            {
                // built-in field, ie attribute
                //return XmlString(index, _builtInValues1[index]);
                return _builtInValues[index];
            }

            index -= NavigableContentType.BuiltinProperties.Length;
            var properties = _content.PropertiesArray;
            if (index >= properties.Length)
                throw new ArgumentOutOfRangeException(nameof(index));

            // custom property, ie element
            return properties[index].GetXPathValue();
        }

        #endregion
    }
}