// Copyright (C) Stichting Deltares 2023. All rights reserved.
// 
// This file is part of the Dam Engine.
// 
// The Dam Engine is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
// 
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
// 
// All names, logos, and references to "Deltares" are registered trademarks of
// Stichting Deltares and remain full property of Stichting Deltares at all times.
// All rights reserved.

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

namespace Deltares.DamEngine.Calculators.KernelWrappers.Assemblers
{
    /// <summary>
    /// Default implementation for the <see cref="IDtoAssembler{TDomainInputObject,TDomainOutputObject,TDataTransferObject}"/> interface
    /// </summary>
    /// <remarks>
    /// This base class inherits from <see cref="IDtoAssembler{TDomainInputObject,TDomainOutputObject,TDataTransferObject}"/> this class just fixes 
    /// the dto type to XElement
    /// </remarks>
    public abstract class DtoDocumentAssembler<TDomainInputObject, TDomainOutputObject> : IDtoAssembler<TDomainInputObject, TDomainOutputObject, XDocument>
        where TDomainInputObject : new()
        where TDomainOutputObject : new()
    {
        /// <summary>
        /// Initializes a new instance of the DtoDocumentAssembler class
        /// </summary>
        /// <param name="elementName">Sets the element name</param>
        /// <param name="xsdStream">The text reader stream for reading in ther xsd file which is embedded as an resource</param>
        public DtoDocumentAssembler(string elementName, string elementNamespace, string embeddedXsdPath)
            : this(elementName, elementNamespace, null, null) {}

        /// <summary>
        /// Initializes a new instance of the DtoDocumentAssembler class
        /// </summary>
        /// <param name="elementName">Sets the element name</param>
        /// <param name="xsdStream">The text reader stream for reading in ther xsd file which is embedded as an resource</param>
        public DtoDocumentAssembler(string elementName, string elementNamespace,
                                    DtoAssembler<TDomainInputObject> inputAssembler,
                                    DtoAssembler<TDomainOutputObject> outputAssembler)
        {
            if (elementName == null)
            {
                throw new ArgumentNullException("elementName");
            }

            if (elementNamespace == null)
            {
                throw new ArgumentNullException("elementNamespace");
            }

            ElementName = elementName;
            ElementNamespace = elementNamespace;
            OutputAssembler = outputAssembler;
            InputAssembler = inputAssembler;
            //Stream xsdStream = Common.GetEmbeddedFile(Assembly.GetExecutingAssembly(), embeddedXsdPath);
            //this.Schema = XDocument.Load(new StreamReader(xsdStream));
        }

        /// <summary>
        /// Gets the xml element name
        /// </summary>
        public string ElementName { get; }

        /// <summary>
        /// Gets or sets the namespace value for the element
        /// </summary>
        public string ElementNamespace { get; }

        /// <summary>
        /// Gets the xml schema (if any)
        /// </summary>
        public XDocument Schema { get; private set; }

        /// <summary>
        /// 
        /// </summary>
        public DtoAssembler<TDomainInputObject> InputAssembler { get; set; }

        /// <summary>
        /// 
        /// </summary>
        public DtoAssembler<TDomainOutputObject> OutputAssembler { get; set; }

        public TDomainOutputObject CreateOutputObject(string fileName)
        {
            return CreateOutputObject(CreateDocument(fileName));
        }

        public TDomainInputObject CreateInputObject(string fileName)
        {
            return CreateInputObject(CreateDocument(fileName));
        }

        private XDocument CreateDocument(string fileName)
        {
            if (!fileName.HasValidStringValue())
            {
                throw new ArgumentNullException("fileName");
            }

            XDocument doc = XDocument.Load(fileName);
            return doc;
        }

        #region IDtoAssembler<TDomainInputObject,TDomainOutputObject,XDocument> Members

        public virtual TDomainOutputObject CreateOutputObject(XDocument dtoObject)
        {
            if (dtoObject == null)
            {
                throw new ArgumentNullException("dtoObject");
            }

            if (OutputAssembler != null)
            {
                // the document should contain the element only once!
                XElement el = (from x in dtoObject.Descendants()
                               where x.Name.LocalName == OutputAssembler.ElementName
                               select x).Single();

                return OutputAssembler.CreateDomainObject(el);
            }

            return default;
        }

        public virtual TDomainInputObject CreateInputObject(XDocument dtoObject)
        {
            if (dtoObject == null)
            {
                throw new ArgumentNullException("dtoObject");
            }

            if (InputAssembler != null)
            {
                // the document should contain the element only once!
                XElement el = (from x in dtoObject.Descendants()
                               where x.Name.LocalName == InputAssembler.ElementName
                               select x).Single();

                return InputAssembler.CreateDomainObject(el);
            }

            return default;
        }

        public virtual XDocument CreateDataTransferObject(TDomainInputObject dtoObject)
        {
            var doc = new XDocument(new XDeclaration("1.0", "utf-8", "yes"));

            // add the file identification to the document
            var fileId = new FileIdentification(Assembly.GetCallingAssembly());
            var fileIdAssembler = new FileIdentificationAssembler();

            XNamespace xsi = "http://www.w3.org/2001/XMLSchema-instance";

            XNamespace tns = ElementNamespace;
            XNamespace tns1 = fileIdAssembler.ElementNamespace;

            var root = new XElement(tns + ElementName,
                                    new XAttribute(XNamespace.Xmlns + "xsi", xsi.NamespaceName),
                                    new XAttribute(XNamespace.Xmlns + "tns", tns.NamespaceName),
                                    new XAttribute(XNamespace.Xmlns + "tns1", tns1.NamespaceName));

            doc.Add(root);
            doc.Root.Add(fileId.ToDto(fileIdAssembler, tns));

            if (InputAssembler != null)
            {
                XNamespace tns2 = InputAssembler.ElementNamespace;
                root.Add(new XAttribute(XNamespace.Xmlns + "tns2", tns2.NamespaceName));
                doc.Root.Add(dtoObject.ToDto(InputAssembler, tns));
            }

            return doc;
        }

        #endregion
    }
}