// Viewer Select
// (c) 2016-2020 Leo Davidson

// This is a script for Directory Opus.
// See https://www.gpsoft.com.au/DScripts/redirect.asp?page=scripts for development information.
// See https://resource.dopus.com/t/viewer-select-make-file-display-track-standalone-viewer/23320/1 for information about this specific script.

// Called by Directory Opus to initialize the script
function OnInit(initData)
{
	initData.name = "Viewer Select";
	initData.version = "1.4";
	initData.copyright = "(c) 2016-2020 Leo Davidson";
	initData.url = "https://resource.dopus.com/t/viewer-select-make-file-display-track-standalone-viewer/23320/1";
	initData.desc = "The file display selection will track the standalone viewer's current file.";
	initData.default_enable = true;
	initData.min_version = "12.2";
	
	initData.vars.Set("VMapPaths", DOpus.Create.Map());
	initData.vars("VMapPaths").persist = false;
}

// Called when an event takes place in the standalone viewer
function OnViewerEvent(viewerEventData)
{
	var viewer   = viewerEventData.viewer;
	var tab      = viewer.parenttab;
	var mapPaths = Script.vars("VMapPaths").value;

	if (viewerEventData.event == "load")
	{
		if (!mapPaths.exists(viewer))
		{
			// For the first file, verify the tab contains the file we open with.
			// If it doesn't, the viewer may have been launched from outside of Opus,
			// or via a command which explicitly displays a file from a path which isn't
			// visible in the folder tab. Those situations still associate the viewer with
			// a lister/tab if one exists, and we want to leave those tabs alone.

			if (TabContainsFile(tab, viewer.current))
			{
				mapPaths(viewer) = tab.path + ""; // Store string, not Path object.
			}
			else
			{
				mapPaths(viewer) = ""; // Make a note to ignore this viewer.
			}
		}

		var path = mapPaths(viewer);
		var file = viewerEventData.item;

		// Still in the starting folder?
		if (typeof tab  != "undefined"
		&&  typeof path != "undefined"
		&&  typeof file != "undefined"
		&&  path != ""
		&&  tab.path == path)
		{

			var cmd = DOpus.Create.Command();
			cmd.SetSourceTab(tab);

			cmd.AddFile(file);
			var cmdLine = "Select FROMSCRIPT SETFOCUS DESELECTNOMATCH";
			if (DOpus.Version.AtLeast("12.22.3"))
			{
				cmdLine += " IGNORECHECKBOXMODE";
			}
			cmd.RunCommand(cmdLine);
		}

		return;
	}

	if (viewerEventData.event == "destroy")
	{
		mapPaths.erase(viewer);
		return;
	}
}

function TabContainsFile(tab, item)
{
	// Workaround to avoid error if no valid file is passed.

	if (typeof tab  == "undefined"
	||  typeof item == "undefined")
	{
		return false;
	}

	// Simple test is usually enough. Is the tab showing the folder the file is in?
	// (It's possible the file is hidden, but that would be weird in this context, so we ignore that.)

	if (DOpus.FSUtil.ComparePath(DOpus.FSUtil.Resolve(tab.path), item.path))
	{
		return true;
	}

	// To work in collections, libraries and flat view, we need to go through the actual list of files.
	// This could be slow as we don't currently have a quicker way than looping through the files.

	var itemPathString = item + "";

	// It'll usually be a selected file if the viewer opened via double-click. Try them first.

	for (var eItems = new Enumerator(tab.selected_files); !eItems.atEnd(); eItems.moveNext())
	{
		// Compare the path strings, not the item objects.
		if ((eItems.item() + "") == itemPathString)
		{
			return true;
		}
	}

	for (var eItems = new Enumerator(tab.files); !eItems.atEnd(); eItems.moveNext())
	{
		// Compare the path strings, not the item objects.
		// Skip selected files as we already checked them.
		if (!eItems.item().selected && (eItems.item() + "") == itemPathString)
		{
			return true;
		}
	}

	return false;
}