using System;
using System.Globalization;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;

using Autodesk.Revit;
using Autodesk.Revit.DB;
using Autodesk.RevitAddIns;

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;

using Microsoft.Win32;

namespace RevitLess;

public partial class MainWindowViewModel : ObservableObject
{
	private static RevitVersion RevitVersion = RevitVersion.Unknown;

	private static Document doc;
	private static RevitContext RevitApp => RevitContext.Instance;

	/// <summary>
	///     获取Revit文件的版本
	/// </summary>
	/// <param name="path">文件路径</param>
	/// <returns></returns>
	public static RevitVersion GetRevitVersion(string path)
	{
		string revitVersion = null;
		var stream = new FileStream(path, FileMode.Open);

		var size = 1024 * 1024;
		var bytes = new byte[size];

		while (stream.Read(bytes, 0, size) > 0)
		{
			var str = Encoding.Unicode.GetString(bytes);

			const string pattern = @"Autodesk Revit \d{4}";
			var match = Regex.Match(str, pattern);
			if (match.Success)
			{
				revitVersion = "Revit" + match.Value.Substring(match.Length - 4, 4);

				//File.WriteAllText(@"D:\abc.txt", str);
				break;
			}
		}

		foreach (RevitVersion ver in Enum.GetValues(typeof(RevitVersion)))
		{
			if (Enum.GetName(typeof(RevitVersion), ver) == revitVersion)
			{
				return ver;
			}
		}

		return RevitVersion.Unknown;
		//var s = Enum.GetName(typeof(RevitVersion), revitVersion);
		//return revitVersion;
	}

	/// <summary>
	/// 根据Revit文件获取Revit安装路径
	/// </summary>
	/// <returns></returns>
	private string GetRevitLocation()
	{
		var file = new FileInfo(SourceFilePath);

		if (file.Exists)
		{
			//文件级获取Revit版本，不打开Revit软件
			RevitVersion = GetRevitVersion(SourceFilePath);
			//根据文件版本获取Revit产品安装位置
			return RevitProductUtility.GetAllInstalledRevitProducts().Find(x => x.Version == RevitVersion)?.InstallLocation;
		}
		else
		{
			//已安装的默认Revit产品安装位置
			return RevitProductUtility.GetAllInstalledRevitProducts().Find(x => x.Version >= RevitVersion)?.InstallLocation;
		}
	}

	private static void SaveFile(Document document)
	{
		var workPath = Path.GetDirectoryName(typeof(App).Assembly.Location);
		var i = 1;
		var saveFilePath = Path.Combine(workPath, $"项目 {i}.rvt");
		var saveFile = new FileInfo(saveFilePath);
		if (saveFile.Exists)
		{
			i++;
			saveFilePath = $"项目 {i}";
		}

		document.SaveAs(saveFilePath);
	}

	private bool CanOperation => !(string.IsNullOrEmpty(SourceFilePath) || string.IsNullOrEmpty(TargetFilePath));

	private void InitFinished(object sender, Product revitProduct)
	{
		doc = RevitApp.OpenFile(SourceFilePath);
	}

	[RelayCommand(CanExecute = nameof(CanOperation))]
	private void Execute()
	{
		Log = "Revit程序启动中...\n";
		RevitApp.Run();
		RevitApp.InitFinished += InitFinished; //订阅
		RevitApp.InitRevitAppAndOpenFile(); //执行订阅事件
		ExecuteOperation();
		RevitApp.Exit();
		var time = Convert.ToString(DateTime.Now, CultureInfo.InvariantCulture);
		Log = $"{time} 处理完毕，结束进程。";
		//Console.ReadKey();
	}

	private void ExecuteOperation()
	{
		//document.SaveAs(saveFilePath, new SaveAsOptions() { OverwriteExistingFile = true });
		//View3D view = revit.GetView3D(document);
		//if (view != null)
		//{
		//    Console.WriteLine(view.Name);

		//    //var elements = revit.GetElementsWithView(view);
		//    foreach (var element in elements)
		//    {
		//        Console.WriteLine(element.Name);
		//    }
		//}
		var view = RevitHelper.GetView3D(doc);
		using (var ts = new Transaction(doc, "修改"))
		{
			ts.Start();
			doc.Create.NewModelCurve(Line.CreateBound(new XYZ(0, 0, 0), new XYZ(0, 10, 0)), view.SketchPlane);
			ts.Commit();
		}
		//doc.SaveAs(,new SaveAsOptions { PreviewViewId =view.Id});
		doc.SaveAs(TargetFilePath);
	}

	[ObservableProperty]
	[NotifyCanExecuteChangedFor(nameof(ExecuteCommand))]
	private string sourceFilePath;

	[ObservableProperty]
	[NotifyCanExecuteChangedFor(nameof(ExecuteCommand))]
	private string targetFilePath;

	[ObservableProperty]
	private string log;

	[RelayCommand]
	private void SelectFile()
	{
		var dialog = new OpenFileDialog
		{
			CheckFileExists = true,
			CheckPathExists = true,
			DereferenceLinks = false,
			Filter = "所有Revit文件 (*.rvt, *.rfa, *.rte, *.rft)|*.rvt;*.rfa;*.rte;*.rft",
			FilterIndex = 0,
			Title = "打开文件",
			ValidateNames = true,
			Multiselect = true,
			ReadOnlyChecked = true,
			ShowReadOnly = true
		};
		if (dialog.ShowDialog() == true)
		{
			SourceFilePath = dialog.FileName;
			var revitPath = GetRevitLocation();
			//动态加载程序集
			RevitContext.OnAssemblyResolve(revitPath);
			Log = $"当前使用的Revit文件版本为：{RevitVersion}\n";
		}
	}

	[RelayCommand]
	private void SaveFile()
	{
		SaveFileDialog dialog =
			new()
			{
				CheckPathExists = true,
				DereferenceLinks = false,
				AddExtension = true,
				Filter = "所有Revit文件 (*.rvt, *.rfa, *.rte, *.rft)|*.rvt;*.rfa;*.rte;*.rft",
				FilterIndex = 0,
				Title = "保存文件",
				ValidateNames = true,
			};
		if (dialog.ShowDialog() == true)
		{
			TargetFilePath = dialog.FileName;
		}
	}
}