unitZone={}
unitZone.version = "1.2.3"
unitZone.verbose = false 
unitZone.ups = 1 
unitZone.requiredLibs = {
	"dcsCommon", -- always
	"cfxZones", -- Zones, of course 
}
--[[--
	Version History 
	1.0.0 - Initial Version
	1.1.0 - DML flag integration 
		  - method/uzMethod 
	1.2.0 - uzOn?, uzOff?, triggerMethod
	1.2.1 - uzDirect
	1.2.2 - uzDirectInv 
	1.2.3 - better guards for enterZone!, exitZone!, chsngeZone!
		  - better guards for uzOn? and uzOff?
		  
--]]--

unitZone.unitZones = {}

function unitZone.addUnitZone(theZone)
	table.insert(unitZone.unitZones, theZone)
end

function unitZone.getUnitZoneByName(aName) 
	for idx, aZone in pairs(unitZone.unitZones) do 
		if aName == aZone.name then return aZone end 
	end
	if unitZone.verbose then 
		trigger.action.outText("+++uZne: no unitZone with name <" .. aName ..">", 30)
	end 
	
	return nil 
end

function unitZone.string2cat(filterString)

	if not filterString then return 2 end -- default ground 
	filterString = filterString:lower()
	filterString = dcsCommon.trim(filterString)

	local catNum = tonumber(filterString)
	if catNum then 
		if catNum < 0 then catNum = 0 end 
		if catNum > 4 then catNum = 4 end 
		return catNum 
	end
	
	catNum = 2 -- ground default 
	if dcsCommon.stringStartsWith(filterString, "grou") then catNum = 2 end 
	if dcsCommon.stringStartsWith(filterString, "air") then catNum = 0 end
	if dcsCommon.stringStartsWith(filterString, "hel") then catNum = 1 end
	if dcsCommon.stringStartsWith(filterString, "shi") then catNum = 3 end
	if dcsCommon.stringStartsWith(filterString, "trai") then catNum = 4 end

	return catNum
end

function unitZone.createUnitZone(theZone)
	-- start val - a range
	theZone.lookFor = cfxZones.getStringFromZoneProperty(theZone, "lookFor", "cfx no unit supplied") 
	if dcsCommon.stringEndsWith(theZone.lookFor, "*") then 
		theZone.lookForBeginsWith = true 
		theZone.lookFor = dcsCommon.removeEnding(theZone.lookFor, "*") 
	end
	
	theZone.matching = cfxZones.getStringFromZoneProperty(theZone, "matching", "group") -- group, player [, name, type]
	theZone.matching = dcsCommon.trim(theZone.matching:lower())
	if theZone.matching == "groups" then theZone.matching = "group" end -- some simplification 
	if theZone.matching == "players" then theZone.matching = "player" end -- some simplification 

	-- coalition 
	theZone.uzCoalition = cfxZones.getCoalitionFromZoneProperty(theZone, "coalition", 0) -- 0 = all
	if cfxZones.hasProperty(theZone, "uzCoalition") then 
		theZone.uzCoalition = cfxZones.getCoalitionFromZoneProperty(theZone, "uzCoalition", 0)
	end
	
	if unitZone.verbose or theZone.verbose then 
		trigger.action.outText("+++uZne: set coa " .. theZone.uzCoalition .. " for <" .. theZone.name .. ">", 30)
	end

	-- DML Method 
	theZone.uzMethod = cfxZones.getStringFromZoneProperty(theZone, "method", "inc")
	if cfxZones.hasProperty(theZone, "uzMethod") then 
		theZone.uzMethod = cfxZones.getStringFromZoneProperty(theZone, "uzMethod", "inc")
	end

	if cfxZones.hasProperty(theZone, "enterZone!") then 
		theZone.enterZone = cfxZones.getStringFromZoneProperty(theZone, "enterZone!", "*<none>")
	end 
	if cfxZones.hasProperty(theZone, "exitZone!") then 
		theZone.exitZone = cfxZones.getStringFromZoneProperty(theZone, "exitZone!", "*<none>")
	end 
	
	if cfxZones.hasProperty(theZone, "changeZone!") then 
		theZone.changeZone = cfxZones.getStringFromZoneProperty(theZone, "changeZone!", "*<none>")
	end 
	
	if cfxZones.hasProperty(theZone, "filterFor") then 
		local filterString = cfxZones.getStringFromZoneProperty(theZone, "filterFor", "1") -- ground 
		theZone.filterFor = unitZone.string2cat(filterString)
		if unitZone.verbose or theZone.verbose then 
			trigger.action.outText("+++uZne: filtering " .. theZone.filterFor .. " in " .. theZone.name, 30)
		end 
	end	
	
	-- uzDirect
	if cfxZones.hasProperty(theZone, "uzDirect") then
		theZone.uzDirect = cfxZones.getStringFromZoneProperty(theZone, "uzDirect", "*<none>")
	end 
	if cfxZones.hasProperty(theZone, "uzDirectInv") then
		theZone.uzDirectInv = cfxZones.getStringFromZoneProperty(theZone, "uzDirectInv", "*<none>")
	end 
	
	-- on/off flags
	theZone.uzPaused = false -- we are turned on 
	if cfxZones.hasProperty(theZone, "uzOn?") then 
		theZone.triggerOnFlag = cfxZones.getStringFromZoneProperty(theZone, "uzOn?", "*<none1>")
		theZone.lastTriggerOnValue = cfxZones.getFlagValue(theZone.triggerOnFlag, theZone)
	end 
	
	if cfxZones.hasProperty(theZone, "uzOff?") then 
		theZone.triggerOffFlag = cfxZones.getStringFromZoneProperty(theZone, "uzOff?", "*<none2>")
		theZone.lastTriggerOffValue = cfxZones.getFlagValue(theZone.triggerOffFlag, theZone)
	end 
	
	theZone.uzTriggerMethod = cfxZones.getStringFromZoneProperty(theZone, "triggerMethod", "change")
	if cfxZones.hasProperty(theZone, "uzTriggerMethod") then 
		theZone.uzTriggerMethod = cfxZones.getStringFromZoneProperty(theZone, "uzTriggerMethod", "change")
	end 
	
	-- now get initial zone status ?
	theZone.lastStatus = unitZone.checkZoneStatus(theZone)
	if unitZone.verbose or theZone.verbose then 
		trigger.action.outText("+++uZne: processsed unit zone " .. theZone.name, 30)
	end
	
end


--
-- process zone 
--

function unitZone.collectGroups(theZone)
	local collector = {}
	if theZone.matching == "player" then 
		-- collect all players matching coalition
		if theZone.uzCoalition == 1 or theZone.uzCoalition == 0 then 
			local allPlayers = coalition.getPlayers(1)
			for idx, pUnit in pairs(allPlayers) do 
				table.insert(collector, pUnit)
			end
		end 
		if theZone.uzCoalition == 2 or theZone.uzCoalition == 0 then 
			local allPlayers = coalition.getPlayers(2)
			for idx, pUnit in pairs(allPlayers) do 
				table.insert(collector, pUnit)
			end
		end
	elseif theZone.matching == "group" then 
		if theZone.uzCoalition == 1 or theZone.uzCoalition == 0 then 
			local allGroups = coalition.getGroups(1, theZone.filterFor)

			for idx, pUnit in pairs(allGroups) do 
				table.insert(collector, pUnit)
			end
		end 
		if theZone.uzCoalition == 2 or theZone.uzCoalition == 0 then 
			local allGroups = coalition.getGroups(2, theZone.filterFor)

			for idx, pUnit in pairs(allGroups) do 
				table.insert(collector, pUnit)
			end
		end
	else 
		trigger.action.outText("+++uZne: unknown matching: " .. theZone.matching, 30)
		return {}
	end
	
	return collector
end

function unitZone.checkZoneStatus(theZone)
	-- returns true (at least one unit found in zone)
	-- or false (no unit found in zone)
	
	-- collect all groups to inspect 
	local theGroups = unitZone.collectGroups(theZone)
	local lookFor = theZone.lookFor
	-- now see if the groups match name and then check inside status for each 
	local playerCheck = theZone.matching == "player"
	if playerCheck then 
		-- we check the names for players only 
		for idx, pUnit in pairs(theGroups) do 
			local puName=pUnit:getName()
			local hasMatch = false 
			if theZone.lookForBeginsWith then 
				hasMatch = dcsCommon.stringStartsWith(puName, lookFor)
			else 
				hasMatch = puName == lookFor 
			end
			if hasMatch then 
				if cfxZones.unitInZone(pUnit, theZone) then 
					return true
				end
			end
		end 
        
	else 
		-- we perform group check 
		for idx, aGroup in pairs(theGroups) do 
			local gName=aGroup:getName()
			local hasMatch = false 
			if theZone.lookForBeginsWith then 
				hasMatch = dcsCommon.stringStartsWith(gName, lookFor)
			else 
				hasMatch = gName == lookFor 
			end
			if hasMatch and aGroup:isExist() then 
				-- check all living units in zone 
				local gUnits = aGroup:getUnits()
				for idy, aUnit in pairs (gUnits) do
					--trigger.action.outText("trying " .. gName,10)
					if cfxZones.unitInZone(aUnit, theZone) then 
						return true
					end
				end
			end
		end
	end
	return false 
end

--
-- update 
--
function unitZone.bangState(theZone, newState)
	
	if theZone.changeZone then 
		cfxZones.pollFlag(theZone.changeZone, theZone.uzMethod, theZone)
	end 
	if newState then 
		if theZone.enterZone then 
			cfxZones.pollFlag(theZone.enterZone, theZone.uzMethod, theZone)
			if unitZone.verbose then 
				trigger.action.outText("+++uZone: banging enter! with <" .. theZone.uzMethod .. "> on <" .. theZone.enterZone .. "> for " .. theZone.name, 30)
			end
		end
	else 
		if theZone.exitZone then 
			cfxZones.pollFlag(theZone.exitZone, theZone.uzMethod, theZone)
			if unitZone.verbose then 
				trigger.action.outText("+++uZone: banging exit! with <" .. theZone.uzMethod .. "> on <" .. theZone.exitZone .. "> for " .. theZone.name, 30)
			end
		end 
	end
end

function unitZone.update()
	-- call me in a second to poll triggers
	timer.scheduleFunction(unitZone.update, {}, timer.getTime() + 1/unitZone.ups)
		
	for idx, aZone in pairs(unitZone.unitZones) do
		-- check if we need to pause/unpause 
		if aZone.triggerOnFlag and cfxZones.testZoneFlag(aZone, aZone.triggerOnFlag, aZone.uzTriggerMethod, "lastTriggerOnValue") then 
			if unitZone.verbose or aZone.verbose then 
				trigger.action.outText("+++uZone: turning " .. aZone.name .. " on", 30)
			end 
			aZone.uzPaused = false 
		end
		
		if aZone.triggerOffFlag and cfxZones.testZoneFlag(aZone, aZone.triggerOffFlag, aZone.uzTriggerMethod, "lastTriggerOffValue") then 
			if unitZone.verbose or aZone.verbose then 
				trigger.action.outText("+++uZone: turning " .. aZone.name .. " OFF", 30)
			end 
			aZone.uzPaused = true 
		end
		
		-- scan all zones 
		if not aZone.uzPaused then 
			local newState = unitZone.checkZoneStatus(aZone)

			if newState ~= aZone.lastStatus then 
				-- bang on change! 
				unitZone.bangState(aZone, newState)
				aZone.lastStatus = newState 
			end
			
			-- output direct state suite
			if aZone.uzDirect then 
				if newState then 
					cfxZones.setFlagValueMult(aZone.uzDirect, 1, aZone)
				else 
					cfxZones.setFlagValueMult(aZone.uzDirect, 0, aZone)
				end
			end
			if aZone.uzDirectInv then 
				if newState then 
					cfxZones.setFlagValueMult(aZone.uzDirectInv, 0, aZone)
				else 
					cfxZones.setFlagValueMult(aZone.uzDirectInv, 1, aZone)
				end
			end
		end 
	end
end

--
-- Config & Start
--
function unitZone.readConfigZone()
	local theZone = cfxZones.getZoneByName("unitZoneConfig") 
	if not theZone then 
		if unitZone.verbose then 
			trigger.action.outText("+++uZne: NO config zone!", 30)
		end 
		return 
	end 
	
	unitZone.verbose = cfxZones.getBoolFromZoneProperty(theZone, "verbose", false)
	
	unitZone.ups = cfxZones.getNumberFromZoneProperty(theZone, "ups", 1)
	
	if unitZone.verbose then 
		trigger.action.outText("+++uZne: read config", 30)
	end 
end

function unitZone.start()
	-- lib check
	if not dcsCommon.libCheck then 
		trigger.action.outText("cfx Unit Zone requires dcsCommon", 30)
		return false 
	end 
	if not dcsCommon.libCheck("cfx Unit Zone", unitZone.requiredLibs) then
		return false 
	end
	
	-- read config 
	unitZone.readConfigZone()
	
	-- process cloner Zones 
	local attrZones = cfxZones.getZonesWithAttributeNamed("unitZone")
	for k, aZone in pairs(attrZones) do 
		unitZone.createUnitZone(aZone) -- process attributes
		unitZone.addUnitZone(aZone) -- add to list
	end
	
	-- start update 
	unitZone.update()
	
	trigger.action.outText("cfx Unit Zone v" .. unitZone.version .. " started.", 30)
	return true 
end

-- let's go!
if not unitZone.start() then 
	trigger.action.outText("cfx Unit Zone aborted: missing libraries", 30)
	unitZone = nil 
end

--ToDo: add 'neutral' support and add 'both' option 
--ToDo: add API