using System;
using System.Linq;
using System.Xml.Linq;

namespace Website.DataAccess
{
    public class XmlContentProvider : IContentProvider
    {
        public const string FILE_PATH_APP_SETTING = "XmlContentProvider.FilePath";
        private XDocument contentData;

        public XmlContentProvider()
            : this(Parse.AppSetting<string>(FILE_PATH_APP_SETTING))
        {
        }
        public XmlContentProvider(string filePath)
        {
            LoadContentData(filePath);
        }

        private void LoadContentData(string filePath)
        {
            contentData = XDocument.Load(filePath);
        }

        public IContent GetById(int id)
        {
            return (from c in contentData.Elements("ContentBlock")
                    where c.Attribute("ID").Value == id.ToString()
                    select CreateContent(c)).FirstOrDefault();
        }

        public IContent GetByAlias(string alias)
        {
            return (from c in contentData.Elements("ContentBlock")
                    where   c.Attribute("Alias") != null && 
                            c.Attribute("Alias").Value.Equals(alias, StringComparison.OrdinalIgnoreCase)
                    select CreateContent(c)).FirstOrDefault();
        }

        private static IContent CreateContent(XElement el)
        {
            return new Content
            {
                ID = ((int)el.Attribute("ID")),
                Title = el.Element("Title").Value,
                Html = el.Element("Html").Value,
                Alias = (el.Element("Alias") != null ? el.Element("Alias").Value : null)
            };
        }

        public void Save(IContent content)
        {
            throw new NotImplementedException();
        }
    }
}