using Microsoft.VisualStudio;
using Microsoft.VisualStudio.Shell;
using Microsoft.VisualStudio.Shell.Interop;
using System;
using System.Runtime.InteropServices;

[Guid("D1A5D9FA-32F0-4001-BDD2-BB3D50F4E6C3")] 
public class SqlEditorFactory : IVsEditorFactory
{
    private ServiceProvider _serviceProvider;

    public int SetSite(Microsoft.VisualStudio.OLE.Interop.IServiceProvider psp)
    {
        _serviceProvider = new ServiceProvider(psp);
        return VSConstants.S_OK;
    }

    public int Close() => VSConstants.S_OK;

    public int CreateEditorInstance(
        uint grfCreateDoc,
        string pszMkDocument,
        string pszPhysicalView,
        IVsHierarchy pvHier,
        uint itemid,
        IntPtr punkDocDataExisting,
        out IntPtr ppunkDocView,
        out IntPtr ppunkDocData,
        out string pbstrEditorCaption,
        out Guid pguidCmdUI,
        out int pgrfCDW)
    {
        ppunkDocView = IntPtr.Zero;
        ppunkDocData = IntPtr.Zero;
        pbstrEditorCaption = string.Empty;
        pgrfCDW = 0;

        IVsTextLines textLines = new VsTextBufferClass();

        ppunkDocData = Marshal.GetIUnknownForObject(textLines);
        ppunkDocView = ppunkDocData;

        pguidCmdUI = Guid.Empty;

        return VSConstants.S_OK;
    }
}