using System;
using System.Text;

namespace Nikse.SubtitleEdit.Core
{
    public static class XmlDeserializerGenerator
    {

        public static string GenerateCSharpXmlDeserializerForLanguageStructure()
        {
            var sb = new StringBuilder();
            sb.AppendLine(@"using System.IO;
using System.Xml;

namespace Nikse.SubtitleEdit.Logic
{

    public class LanguageDeserializer
    {

        public static Language CustomDeserializeLanguage(string fileName)
        {
            var doc = new XmlDocument();
            doc.PreserveWhitespace = true;

            var stream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            doc.Load(stream);
            stream.Close();

            XmlNode node = doc.DocumentElement;
            XmlNode subNode;
            var language = new Language();
");
            sb.AppendLine(GenerateCSharpXmlDeserializer(typeof(Language), "language", string.Empty));
            sb.AppendLine();
            sb.AppendLine("\t\t\treturn language;");
            sb.AppendLine("\t\t}");
            sb.AppendLine("\t}");
            sb.AppendLine("}");
            return sb.ToString();
        }

        private static string GenerateCSharpXmlDeserializer(Type classType, string currentName, string xmlPath)
        {
            xmlPath = xmlPath.Trim('/');

            var sb = new StringBuilder();

            var properties = classType.GetProperties();
            if (properties.Length == 0)
            {
                var fields = classType.GetFields();
                foreach (var fieldInfo in fields)
                {
                    if (fieldInfo.FieldType.Name == "String")
                    {
                        sb.AppendLine("\t\t\tsubNode = node.SelectSingleNode(\"" + fieldInfo.Name + "\");");
                        sb.AppendLine("\t\t\tif (subNode != null)");
                        sb.AppendLine("\t\t\t\t" + currentName + "." + fieldInfo.Name + " = subNode.InnerText;");
                    }
                }
                foreach (var fieldInfo in fields)
                {
                    if (fieldInfo.FieldType.Name != "String" && fieldInfo.FieldType.FullName.Contains("LanguageStructure"))
                    {
                        sb.AppendLine();
                        sb.AppendLine("\t\t\t" + currentName + "." + fieldInfo.Name + " = new " + fieldInfo.FieldType.FullName.Replace("+", ".") + "();");
                        sb.AppendLine("\t\t\tnode = doc.DocumentElement.SelectSingleNode(\"" + fieldInfo.Name + "\");");
                        sb.AppendLine("\t\t\tif (node != null)");
                        sb.AppendLine("\t\t\t{");
                        sb.AppendLine(GenerateCSharpXmlDeserializer(fieldInfo.FieldType, currentName + "." + fieldInfo.Name, xmlPath + "/" + fieldInfo.Name + "/"));
                        sb.AppendLine("\t\t\t}");
                    }
                }
            }
            else
            {
                foreach (var prp in properties)
                {
                    if (prp.PropertyType.Name == "String")
                    {
                        sb.AppendLine("\t\t\tsubNode = node.SelectSingleNode(\"" + prp.Name + "\");");
                        sb.AppendLine("\t\t\tif (subNode != null)");
                        sb.AppendLine("\t\t\t\t" + currentName + "." + prp.Name + " = subNode.InnerText;");
                    }
                }
                foreach (var prp in properties)
                {
                    if (prp.PropertyType.Name != "String" && prp.PropertyType.FullName.Contains("LanguageStructure"))
                    {
                        sb.AppendLine();
                        sb.AppendLine("\t\t\t" + currentName + "." + prp.Name + " = new " + prp.PropertyType.FullName.Replace("+", ".") + "();");
                        sb.AppendLine("\t\t\tnode = doc.DocumentElement.SelectSingleNode(\"" + xmlPath + "/" + prp.Name + "\");");
                        sb.AppendLine("\t\t\tif (node != null)");
                        sb.AppendLine("\t\t\t{");
                        sb.AppendLine(GenerateCSharpXmlDeserializer(prp.PropertyType, currentName + "." + prp.Name, xmlPath + "/" + prp.Name + "/"));
                        sb.AppendLine("\t\t\t}");
                    }
                }
            }
            return sb.ToString();
        }

    }
}