/*==========================================================================================================================
| METHOD: INVOKE
\-------------------------------------------------------------------------------------------------------------------------*/
/// <summary>
/// Assembles the view model for the <see cref="FileListViewComponent"/>.
/// </summary>
public IViewComponentResult Invoke(
EditingTopicViewModel currentTopic,
FileListAttributeDescriptorViewModel attribute,
string htmlFieldPrefix
) {
/*------------------------------------------------------------------------------------------------------------------------
| Validate parameters
\-----------------------------------------------------------------------------------------------------------------------*/
Contract.Requires(currentTopic, nameof(currentTopic));
Contract.Requires(attribute, nameof(attribute));
/*------------------------------------------------------------------------------------------------------------------------
| Set HTML prefix
\-----------------------------------------------------------------------------------------------------------------------*/
ViewData.TemplateInfo.HtmlFieldPrefix = htmlFieldPrefix;
/*------------------------------------------------------------------------------------------------------------------------
| Establish view model
\-----------------------------------------------------------------------------------------------------------------------*/
var model = new FileListAttributeViewModel(currentTopic, attribute) {
AbsolutePath = _webHostEnvironment.ContentRootPath + attribute.Path
};
/*------------------------------------------------------------------------------------------------------------------------
| Set model values
\-----------------------------------------------------------------------------------------------------------------------*/
foreach (var file in GetFiles(model)) {
model.Files.Add(file);
};
/*------------------------------------------------------------------------------------------------------------------------
| Return view with view model
\-----------------------------------------------------------------------------------------------------------------------*/
return View(model);
}
/*==========================================================================================================================
| METHOD: GET FILES
\-------------------------------------------------------------------------------------------------------------------------*/
/// <summary>
/// Retrieves a collection of files in a directory, given the provided <see cref="Path"/>.
/// </summary>
public static Collection<SelectListItem> GetFiles(FileListAttributeViewModel viewModel) {
/*------------------------------------------------------------------------------------------------------------------------
| Validate parameters
\-----------------------------------------------------------------------------------------------------------------------*/
Contract.Requires(viewModel, nameof(viewModel));
/*------------------------------------------------------------------------------------------------------------------------
| INSTANTIATE OBJECTS
\-----------------------------------------------------------------------------------------------------------------------*/
var attribute = viewModel.AttributeDescriptor;
var absolutePath = viewModel.AbsolutePath;
var files = new Collection<SelectListItem>();
var searchPattern = "*";
var searchOption = attribute.IncludeSubdirectories is true? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly;
/*------------------------------------------------------------------------------------------------------------------------
| Validate input
\-----------------------------------------------------------------------------------------------------------------------*/
if (String.IsNullOrEmpty(attribute.Path)) return files;
if (!Directory.Exists(absolutePath)) return files;
/*------------------------------------------------------------------------------------------------------------------------
| Filter file list based on extension
\-----------------------------------------------------------------------------------------------------------------------*/
if (attribute.Extension is not null) {
searchPattern = searchPattern + "." + attribute.Extension;
}
/*------------------------------------------------------------------------------------------------------------------------
| Filter file list based on filter criteria
\-----------------------------------------------------------------------------------------------------------------------*/
if (attribute.Filter is not null) {
searchPattern = attribute.Filter + searchPattern;
}
/*------------------------------------------------------------------------------------------------------------------------
| GET ALL FILES
\-----------------------------------------------------------------------------------------------------------------------*/
var foundFiles = Directory.GetFiles(absolutePath, searchPattern, searchOption);
/*------------------------------------------------------------------------------------------------------------------------
| Set label
\-----------------------------------------------------------------------------------------------------------------------*/
if (!String.IsNullOrEmpty(viewModel.InheritedValue)) {
setLabel(viewModel.InheritedValue, "inherited value");
}
else if (!String.IsNullOrEmpty(viewModel.AttributeDescriptor.DefaultValue)) {
setLabel(viewModel.AttributeDescriptor.DefaultValue, "default value");
}
else if (!String.IsNullOrEmpty(viewModel.AttributeDescriptor.ImplicitValue)) {
setLabel(viewModel.AttributeDescriptor.ImplicitValue, "implicit default");
}
else {
setLabel("Select a file…");
}
foreach (var foundFile in foundFiles) {
var fileName = foundFile.Replace(absolutePath, "", StringComparison.OrdinalIgnoreCase);
var fileNameKey = fileName.Replace("." + attribute.Extension, "", StringComparison.OrdinalIgnoreCase);
files.Add(new(fileNameKey, fileName));
}
/*------------------------------------------------------------------------------------------------------------------------
| RETURN FILE LIST
\-----------------------------------------------------------------------------------------------------------------------*/
return files;
/*------------------------------------------------------------------------------------------------------------------------
| Function: Set Label
\-----------------------------------------------------------------------------------------------------------------------*/
void setLabel(string value, string? contextualLabel = null) {
var label = value;
if (contextualLabel is not null) {
label += " (" + contextualLabel + ")";
}
viewModel.Files.Add(
new() {
Value = "",
Text = label
}
);
}
}
