// Called by Directory Opus to initialize the script
function OnInit(initData)
{
	initData.name = "Folder Camera Models";
	initData.version = "1.0";
	initData.copyright = "(c) 2018 Leo Davidson";
	initData.url = "https://resource.dopus.com/t/camera-models-column-collate-child-file-metadata-for-parent-folder/29717";
	initData.desc = "Column for camera models of files within folders";
	initData.default_enable = true;
	initData.min_version = "12.0";

	var col = initData.AddColumn();
	col.name = "CameraModels";
	col.method = "OnCameraModels";
	col.label = "Camera Models";
	col.justify = "left";
	col.autogroup = true;
}


// Implement the CameraModel column
function OnCameraModels(scriptColData)
{
	var item = scriptColData.item;
	if (!item.is_dir)
	{
		var cameraModel = GetCameraModelFromFile(item);
		if (cameraModel != null)
			scriptColData.value = cameraModel;
		return;
	}

	var isRecursive = true;

	var modelSet = DOpus.Create.StringSetI();

	var folderEnum = DOpus.FSUtil.ReadDir(item, isRecursive);
	while (!folderEnum.complete)
	{
		var childItem = folderEnum.next;
		if (!childItem.is_dir)
		{
			var cameraModel = GetCameraModelFromFile(childItem);
			if (cameraModel != null)
				modelSet.insert(cameraModel);
		}
	}

	if (modelSet.empty)
		return;

	var cameraModels = null;
	for (var e = new Enumerator(modelSet); !e.atEnd(); e.moveNext())
	{
		if (cameraModels == null)
			cameraModels = e.item();
		else
			cameraModels += ("; " + e.item());
	}

	scriptColData.value = cameraModels;
}

function GetCameraModelFromFile(fileItem)
{
	var imageMeta = fileItem.metadata.image;
	if (imageMeta == null)
		return null;

	var cameraModel = imageMeta.cameramodel;
	if (cameraModel == null || typeof(cameraModel) != "string" || cameraModel == "")
		return null;

	return cameraModel;
}