internal IEnumerable GetPastableFiles()

in sources/Google.Solutions.Mvvm/Controls/FileBrowser.cs [568:661]
63 lines of code
9 McCabe index (conditional complexity)

        internal IEnumerable<FileInfo> GetPastableFiles(
            IDataObject dataObject,
            bool promptForConflicts)
        {
            //
            // Extract file paths, ignore directory paths.
            //
            var files = GetPastableFiles(dataObject);

            if (!promptForConflicts)
            {
                return files;
            }

            //
            // Allow user to exclude files that would otherwise be overwritten.
            //
            Debug.Assert(this.currentDirectoryContents != null);
            Debug.Assert(this.currentDirectoryContents!.Count == this.fileList.Items.Count);

            var result = new List<FileInfo>();
            foreach (var file in files)
            {
                var conflictingItem = this.currentDirectoryContents
                    .FirstOrDefault(f => f.Name == file.Name);

                var dialogResult = DialogResult.OK;
                if (conflictingItem != null && !conflictingItem.Type.IsFile)
                {
                    //
                    // There is an existing directory with the same name
                    // as the file to be dropped.
                    //

                    var parameters = new TaskDialogParameters(
                        "Copy files",
                        $"The destination already has a directory named '{conflictingItem.Name}'",
                        string.Empty)
                    {
                        Icon = TaskDialogIcon.Error
                    };

                    parameters.Buttons.Add(new TaskDialogCommandLinkButton(
                        "Skip this file",
                        DialogResult.Ignore));
                    parameters.Buttons.Add(TaskDialogStandardButton.Cancel);

                    dialogResult = this.TaskDialog.ShowDialog(this, parameters);
                }
                else if (conflictingItem != null)
                {
                    //
                    // There is an existing file with the same name
                    // as the file to be dropped.
                    //

                    var parameters = new TaskDialogParameters(
                        "Copy files",
                        $"The destination already has a file named '{conflictingItem.Name}'",
                        string.Empty)
                    {
                        Icon = TaskDialogIcon.Warning
                    };

                    parameters.Buttons.Add(new TaskDialogCommandLinkButton(
                        "Replace the file in the destination",
                        DialogResult.OK));
                    parameters.Buttons.Add(new TaskDialogCommandLinkButton(
                        "Skip this file",
                        DialogResult.Ignore));
                    parameters.Buttons.Add(TaskDialogStandardButton.Cancel);

                    dialogResult = this.TaskDialog.ShowDialog(this, parameters);
                }

                switch (dialogResult)
                {
                    case DialogResult.OK:
                        result.Add(file);
                        break;

                    case DialogResult.Ignore:
                        //
                        // Skip this file.
                        //
                        break;

                    case DialogResult.Cancel:
                        return Array.Empty<FileInfo>();
                }
            }

            return result;
        }