using Microsoft.CodeAnalysis;
using System.Text;
using System.Xml;

namespace LanguageSourceGenerator
{
    [Generator(LanguageNames.CSharp)]
    public class LanguageSourceGenerator : IIncrementalGenerator
    {
        public void Initialize(IncrementalGeneratorInitializationContext context)
        {

            string name = typeof(LanguageSourceGenerator).Assembly.GetManifestResourceNames().First(x=>x.IndexOf("Language.axaml")>=0);
            var stream = typeof(LanguageSourceGenerator).Assembly.GetManifestResourceStream(name);
            XmlDocument document = new XmlDocument();            
            document.PreserveWhitespace = false;
            document.Load(stream);
            var val = document.ChildNodes[0]!.ChildNodes.Cast<System.Xml.XmlNode>().Where(x => x.NodeType == XmlNodeType.Element && x.Attributes?.Count>0).Select(x => (x!.Attributes![0]!.Value, x.InnerText)).ToList();
            if(val.Count>0)
            {
                context.RegisterPostInitializationOutput(c =>
                {
                    StringBuilder stringBuilder = new StringBuilder();
                    stringBuilder.AppendLine("using Avalonia.Collections;");
                    stringBuilder.AppendLine("using Avalonia.Controls;");
                    stringBuilder.AppendLine("using Avalonia.Markup.Xaml;");
                    stringBuilder.AppendLine("using System;");
                    stringBuilder.AppendLine("namespace IViewModel.ViewModels");
                    stringBuilder.AppendLine("{");
                    stringBuilder.AppendLine("    public sealed class LanguageValueViewModel:ViewModelBase");
                    stringBuilder.AppendLine("    {");
                    stringBuilder.AppendLine($"        public string this[string key] => (Avalonia.Application.Current?.FindResource(key) ?? \"<no set>\")+\"\";");
                    stringBuilder.AppendLine("        private LanguageValueViewModel()");
                    stringBuilder.AppendLine("        {");
                    stringBuilder.AppendLine("            GetEvent(LanguageViewModel.LANGUAGECHANGEDEVENT).Subscrip((_, _) =>");
                    stringBuilder.AppendLine("            {");
                    foreach (var item in val)
                    {
                        stringBuilder.AppendLine($"                OnPropertyChanged(nameof({item.Value}));");
                    }
                    stringBuilder.AppendLine("            });");
                    stringBuilder.AppendLine("        }"); 
                    stringBuilder.AppendLine("        static LanguageValueViewModel()");
                    stringBuilder.AppendLine("        {");
                    stringBuilder.AppendLine("        }");
                    stringBuilder.AppendLine("        public static LanguageValueViewModel Instance {get;}= new LanguageValueViewModel();");
                    foreach (var item in val)
                    {

                        stringBuilder.AppendLine($"        /// <summary>");
                        stringBuilder.AppendLine($"        /// {item.InnerText}");
                        stringBuilder.AppendLine($"        /// </summary>");
                        stringBuilder.AppendLine($"        public string {item.Value} => (Avalonia.Application.Current?.FindResource(nameof({item.Value})) ?? \"<no set>\")+\"\";");
                    }
                    stringBuilder.AppendLine("    }");
                    stringBuilder.AppendLine("}");


                    c.AddSource("LanguageValueViewModel.g.cs", stringBuilder.ToString());
                });
            }
        }
    }
}