import re
import system

reSource = re.compile(r"prov\:([^:]+)\:/tag\:([^:]+)\:")
reTagPathProvider = re.compile(r"(\[[^\]]+\])?(.+)")

SUBVIEWS = {
}

def resolveScreenByTagPath(tagPath, defaultOverview="Windows/Graphics/Overview", defaultError=""):
	try:
		(provider, path) = reTagPathProvider.findall(tagPath)[0]
		if provider == None:
			provider = "[default]"
	except:
		return defaultError
	pathParts = path.split("/")
	tags = [provider+"/".join(pathParts[:i])+"/Parameters.GoToScreen" for i in range(len(pathParts), 0, -1)]
	for value in system.tag.readBlocking(tags):
		if value.quality.isGood():
			value = value.getValue()
			if value not in (None, ""):
				return value
			else:
				return defaultError
	# Couldn't find a PathToInstance parameter, default to overview:
	return defaultOverview

def resolveScreenBySource(source, defaultOverview="Windows/Graphics/Overview", defaultError=""):
	try:
		(provider, path) = reSource.findall(source)[0]
		tagPath = "["+provider+"]"+path
	except:
		return defaultOverview
	return resolveScreenByTagPath(tagPath, defaultOverview, defaultError)


def filterAlarms(screen, alarms):
	# Only filter if this isn't the overview:
	if screen <> "Windows/Graphics/Overview":
		# Lookup views to filter on
		views = SUBVIEWS.get(screen, [screen]) + [""] # Include any device tags not set up yet for all views
		badrows = [row for row in range(alarms.getRowCount()) if resolveScreenBySource(alarms.getValueAt(row, "source")) not in views]
		# Return filtered rows:
		return system.dataset.deleteRows(alarms, badrows)
	else:
		return alarms

"""
reMCP = re.compile(r"\[([^\]]+)\]")

def resolveScreen(location, plctag):
	conveyor = location.split(".")[0]
	conveyor_parts = conveyor.split("-")
	conveyor_num = int(conveyor_parts[1].strip(string.ascii_letters)) if len(conveyor_parts) > 1 and conveyor_parts[1].isalnum() and not conveyor_parts[1].isalpha() else 0
	area = conveyor_parts[0]
	area_num = int(area.strip(string.ascii_letters)) if area.isalnum() and not area.isalpha() else 0
	mcp = reMCP.findall(plctag)[0]
	
	return "Windows/Graphics/Overview"

def filterAlarms(screen, alarms):
	# Lookup views to filter on
	views = SUBVIEWS.get(screen, [])
	# Only filter if there are views we found:
	if len(views) > 0:
		badrows = [row for row in range(alarms.getRowCount()) if resolveScreen(alarms.getValueAt(row, "device"), alarms.getValueAt(row, "plctag")) not in views]
		# Return filtered rows:
		return system.dataset.deleteRows(alarms, badrows)
	else:
		return alarms"""