using System.Collections.Generic;

using System.Linq;

using System.Xml;



namespace ReportingServerManager.Logic.ReportModel

{

    class ModelParser

    {

        readonly XmlNamespaceManager myNamespaceMgr = new XmlNamespaceManager(new NameTable());

        readonly Dictionary<string, string> guids = new Dictionary<string, string>();

        readonly XmlDocument doc = new XmlDocument();



        public bool LoadSMDL(string smdl)

        {

            myNamespaceMgr.AddNamespace("ds", "http://schemas.microsoft.com/sqlserver/2004/10/semanticmodeling");



            doc.LoadXml(smdl);



            AddEntityIDs();

            AddEntityAttributeIDs();

            AddEntityRoleIDs();

            AddIdentifyingAttributes();



            return true;

        }



        public bool ContainsGUID(string guid)

        {

            return guids.ContainsKey(guid);

        }



        private void AddEntityIDs()

        {

            AddIDValue("//ds:SemanticModel/ds:Entities/ds:Entity");

        }

        private void AddEntityAttributeIDs()

        {

            AddIDValue("//ds:SemanticModel/ds:Entities/ds:Entity/ds:Fields/ds:Attribute");

        }



        private void AddEntityRoleIDs()

        {

            AddIDValue("//ds:SemanticModel/ds:Entities/ds:Entity/ds:Fields/ds:Role");

        }



        private void AddIdentifyingAttributes()

        {

            var nodeList = doc.SelectNodes("//ds:Entity/ds:IdentifyingAttributes/ds:AttributeReference/ds:AttributeID", myNamespaceMgr);



            if (nodeList != null)

                foreach (var guid in nodeList.Cast<XmlNode>().Select(node => node.InnerText).Where(guid => guids.ContainsKey(guid) == false))

                {

                    guids.Add(guid, "Exists...");

                }

        }



        private void AddIDValue(string xPath)

        {

            var nodeList = doc.SelectNodes(xPath, myNamespaceMgr);



            if (nodeList != null)

                foreach (var guid in nodeList.Cast<XmlNode>().Select(node => node.Attributes != null ? node.Attributes["ID"].Value : null).Where(guid => guids.ContainsKey(guid) == false))

                {

                    guids.Add(guid, "Exists...");

                }

        }

    }

}