using System.IO;

using ACadSharp;
using ACadSharp.Entities;

using Autodesk.Revit.DB;

using CommunityToolkit.Diagnostics;

namespace Sai.RvKits;

public class CadSharperUtil(string path)
{
    public ACadSharp.CadDocument CadDocument { get; private set; } = ACadSharp.IO.DwgReader.Read(path, OnNotification);

    private static void OnNotification(object sender, ACadSharp.IO.NotificationEventArgs e) { }

    /// <summary>
    /// 获取模型中的所有实体
    /// </summary>
    /// <param name="file"></param>
    /// <returns></returns>
    public static CadObjectCollection<ACadSharp.Entities.Entity> GetAllEntitiesInModel(string file)
    {
        var doc = ACadSharp.IO.DwgReader.Read(file);

        // 获取所有绘图实体所在的模型空间
        var modelSpace = doc.BlockRecords["*Model_Space"];

        // 获取模型空间中的所有实体
        return modelSpace.Entities;
    }
    /// <summary>
    /// 获取dwg所在的路径
    /// </summary>
    /// <param name="dwg"></param>
    /// <returns></returns>
    public static string GetDwgPath(ImportInstance dwg)
    {
        var cadLinkType = dwg.Document.GetElement(dwg.GetTypeId()) as CADLinkType;
        Guard.IsNotNull(cadLinkType);
        var filePath = cadLinkType.GetExternalFileReference().GetLinkedFileStatus() == LinkedFileStatus.Loaded
            ? ModelPathUtils.ConvertModelPathToUserVisiblePath(cadLinkType?.GetExternalFileReference().GetAbsolutePath())
            : throw new InvalidOperationException("该dwg不是链接");
        return !File.Exists(filePath) ? throw new InvalidOperationException("链接文件路径不存在") : filePath;
    }

    public static List<KeyValuePair<string, XYZ>> GetTextByLayer(ImportInstance dwg, string textLayerName)
    {
        var keyValuePairs = new List<KeyValuePair<string, XYZ>>();
        var dwgTransform = dwg!.GetTransform();
        var path = CadSharperUtil.GetDwgPath(dwg);
        using ACadSharp.IO.DwgReader reader = new(path);
        var cadDocument = reader.Read();
        var entities = cadDocument.Entities.Where(entity => (entity is ACadSharp.Entities.MText || entity is ACadSharp.Entities.TextEntity) && entity.Layer.Name == textLayerName);
        foreach (var entity in entities)
        {
            if (entity is ACadSharp.Entities.MText mText)
            {
                var loc = dwgTransform.OfPoint(new XYZ(mText.InsertPoint.X, mText.InsertPoint.Y, mText.InsertPoint.Z) / 304.8);
                if (mText.Value.Contains(@"\f") && mText.Value.Contains(@"|b") && mText.Value.Contains(@"i0"))//多行字体编码问题
                {
                    var str = mText.Value.Split(';').Last().TrimEnd('}');
                    keyValuePairs.Add(new KeyValuePair<string, XYZ>(str, loc));
                }
                else
                {
                    keyValuePairs.Add(new KeyValuePair<string, XYZ>(mText.Value, loc));
                }
            }
            if (entity is ACadSharp.Entities.TextEntity text)
            {
                var loc = dwgTransform.OfPoint(new XYZ(text.InsertPoint.X, text.InsertPoint.Y, text.InsertPoint.Z) / 304.8);
                keyValuePairs.Add(new KeyValuePair<string, XYZ>(text.Value, loc));
            }
        }
        return keyValuePairs;
    }
    public void DwgEntitiesToNewFile(string input, string output)
    {
        /* --- 注意事项 ---
		     * ACadSharp无法写入已读的dwg/dxf文件，原因是在写dxf时文件结构有问题 *目前的解决方法是移动实体并将其保存在一个新文件中。
		     */
        var doc = ACadSharp.IO.DwgReader.Read(input);

        //转移实体的新文件
        ACadSharp.CadDocument transfer = new();
        doc.Header.Version = doc.Header.Version;

        //将实体移到所创建的文件中
        List<ACadSharp.Entities.Entity> entities = new(doc.Entities);
        foreach (var item in entities)
        {
            var e = doc.Entities.Remove(item);
            transfer.Entities.Add(e);
        }

        //保存文件
        using ACadSharp.IO.DxfWriter writer = new(output, doc, false);
        writer.OnNotification += Writer_OnNotification;
        writer.Write();
    }

    private void Writer_OnNotification(object sender, ACadSharp.IO.NotificationEventArgs e) { }

    /// <summary>
    /// 读取dxf文件
    /// </summary>
    /// <param name="file">dxf file path</param>
    /// <param name="action"></param>
    public static void ReadDxf(string file, Action<ACadSharp.CadDocument> action)
    {
        using ACadSharp.IO.DxfReader reader = new(file);
        var doc = reader.Read();
        action.Invoke(doc);
    }

    /// <summary>
    /// Read a dwg file
    /// </summary>
    /// <param name="file">dwg file path</param>
    /// <param name="action"></param>
    public static void ReadDwg(string file, Action<ACadSharp.CadDocument> action)
    {
        using ACadSharp.IO.DwgReader reader = new(file);
        var doc = reader.Read();
        action.Invoke(doc);
    }

    /// <summary>
    /// 写一个ascii dxf文件
    /// </summary>
    /// <param name="file"></param>
    /// <param name="doc"></param>
    public void WriteAsciiDxf(string file, ACadSharp.CadDocument doc)
    {
        using ACadSharp.IO.DxfWriter writer = new(file, doc, false);
        writer.OnNotification += Writer_OnNotification;
        writer.Write();
    }

    /// <summary>
    /// 编写一个二进制的dxf文件
    /// </summary>
    /// <param name="file"></param>
    /// <param name="doc"></param>
    public void WriteBinaryDxf(string file, ACadSharp.CadDocument doc)
    {
        using ACadSharp.IO.DxfWriter writer = new(file, doc, true);
        writer.OnNotification += Writer_OnNotification;
        writer.Write();
    }

    /// <summary>
    /// 获取模型中的所有块
    /// </summary>
    /// <param name="file"></param>
    /// <param name="blockName"></param>
    /// <returns></returns>
    public static IEnumerable<Insert> GetInsertEntities(string file, string blockName)
    {
        var doc = ACadSharp.IO.DwgReader.Read(file);

        //获取正在使用你要找的块的插入实例
        return doc.Entities.OfType<ACadSharp.Entities.Insert>().Where(e => e.Block.Name == blockName);
    }

    /// <summary>
    /// 关于如何创建实体并将其添加到绘图中的例子
    /// </summary>
    public static void CreateEntities()
    {
        ACadSharp.CadDocument doc = new();

        ACadSharp.Entities.Point pt = new() { Location = new CSMath.XYZ(10, 10, 0) };

        ACadSharp.Entities.Line line = new() { StartPoint = CSMath.XYZ.Zero, EndPoint = new CSMath.XYZ(5, 5, 0) };

        doc.Entities.Add(pt);
        doc.Entities.Add(line);
    }


}