using CYQ.Data.Properties;
using CYQ.Data.Tool;
using System;
using System.IO;

namespace CYQ.Data.Xml
{
    internal class ResolverDtd
    {
        public static void Resolver(ref System.Xml.XmlDocument xmlDoc)
        {
            xmlDoc.XmlResolver = XHtmlUrlResolver.Instance;
        }
    }
    internal class XHtmlUrlResolver : System.Xml.XmlUrlResolver
    {
        private static XHtmlUrlResolver _Resolver = null;
        public static XHtmlUrlResolver Instance
        {
            get
            {
                if (_Resolver == null)
                {
                    _Resolver = new XHtmlUrlResolver();
                }
                return _Resolver;
            }

        }
        private string dtdUri = null;

        public string DtdUri
        {
            get
            {
                if (dtdUri == null)
                {
                    dtdUri = AppConfig.XHtml.DtdUri;
                    string folder = Path.GetDirectoryName(dtdUri);
                    //检测文件是否存在
                    if (!Directory.Exists(folder))//有异常直接抛
                    {
                        Directory.CreateDirectory(folder);
                    }
                    string[] items = new string[] { "/xhtml1-transitional.dtd", "/xhtml-lat1.ent", "/xhtml-special.ent", "/xhtml-symbol.ent" };
                    if (!File.Exists(folder + items[0]))
                    {
                        using (FileStream fs = File.Create(folder + items[0]))
                        {
                            fs.Write(Resources.xhtml1_transitional, 0, Resources.xhtml1_transitional.Length);
                        }
                        using (FileStream fs = File.Create(folder + items[1]))
                        {
                            fs.Write(Resources.xhtml_lat1, 0, Resources.xhtml_lat1.Length);
                        }
                        using (FileStream fs = File.Create(folder + items[2]))
                        {
                            fs.Write(Resources.xhtml_special, 0, Resources.xhtml_special.Length);
                        }
                        using (FileStream fs = File.Create(folder + items[3]))
                        {
                            fs.Write(Resources.xhtml_symbol, 0, Resources.xhtml_symbol.Length);
                        }
                    }
                }
                return dtdUri;
            }
        }
        ///assemblyShortName;component/resourceLocation， 例如"/SilverlightLibraryAssembly;component/image.png"。 请注意，需要使用前导斜杠和 component 关键字（后跟一个斜杠）。
        public override Uri ResolveUri(Uri baseUri, string relativeUri)
        {
            if (relativeUri.Contains("xhtml1-transitional.dtd") && DtdUri != null)
            {
                relativeUri = DtdUri;
            }
            return base.ResolveUri(baseUri, relativeUri);
        }
    }
}