local BOILER_DEVICE = 'Grzanie' -- przekaznik wykonawczy
local SETPOINT_DEVICE = 'Termostat' -- Zadana temp Termostatu
local TEMPERATURE_SENSOR = 'Temp' -- nazwa czujnika temperatury
local HYSTERESIS = 0.3 -- histereza
local SMOOTH_FACTOR = 4  -- ilosc danych do sredniej
local LOGGING = true  -- logi on , przy false logi off
local MODE = 'Tryb'   -- selektor z trybami pracy

return {
	on = {
		timer = { 'every minute' },-- skrypt sie wykonuje co minute
		device = { TEMPERATURE_SENSOR, SETPOINT_DEVICE }
	},
	data = {
		temperatureReadings = { history = true, maxItems = SMOOTH_FACTOR }
	},
	active = true,
	execute = function(domoticz, device, triggerInfo)

		local avgTemp
		local temperatureReadings = domoticz.data.temperatureReadings
		local boiler = domoticz.devices(BOILER_DEVICE)
		local setpoint = domoticz.devices(SETPOINT_DEVICE)
		local mode = domoticz.devices(MODE)
		local sensor = domoticz.devices(TEMPERATURE_SENSOR)
		local current = sensor.temperature

		if (triggerInfo.type == domoticz.EVENT_TYPE_DEVICE) then

			if (sensor.changed) then
				
				if (current ~= 0 and current ~= nil) then
					temperatureReadings.add(current)
				else
					domoticz.log('Dziwny odczyt czujnika ... skakanie', domoticz.LOG_ERROR)
					return
				end

			elseif (domoticz.devices(SETPOINT_DEVICE).changed) then
				if LOGGING then domoticz.log('Nowe ustawienie Termostatu ' .. device.state) end
			else
			    return
			end
		end

	    if (setpoint.state == nil or setpoint.state == 'Off') then
			boiler.switchOff()
			return 
		end
        local setpointValue = tonumber(setpoint.state)
        local switchOnTemp = setpointValue - HYSTERESIS
        local avgTemp = temperatureReadings.avg(1, SMOOTH_FACTOR, current)

		if LOGGING then
			domoticz.log('Średnia wyliczona temperatura: ' .. avgTemp, domoticz.LOG_INFO)
			domoticz.log('Wartość zadana: ' .. setpointValue, domoticz.LOG_INFO)
			domoticz.log('Aktualny stan ogrzewania: ' .. boiler.state, domoticz.LOG_INFO)
			domoticz.log('Temperatura włączenia: ' .. switchOnTemp, domoticz.LOG_INFO)
		end

		if (avgTemp >= setpointValue and boiler.state == 'On' and mode.state == 'Auto') then
			if LOGGING then domoticz.log('Osiągnięta temperatura docelowa, ogrzewanie off') end
			boiler.switchOff()
			boiler.switchOff().afterMin(2)
		end

		if (avgTemp < setpointValue and boiler.state == 'Off' and mode.state =='Auto')  then
			if (avgTemp < switchOnTemp) then
				if LOGGING then domoticz.log('Temperatura jest za niska ogrzewanie on') end
				boiler.switchOn()
				boiler.switchOn().afterMin(2)
			else
				if LOGGING then domoticz.log('Średnia temperatura poniżej zadanej, ale w zakresie histerezy, w oczekiwaniu na spadek temperatury do ' .. switchOnTemp) end
			end
		end

		if (boiler.state == 'Off' and mode.state == 'Force') then
			if LOGGING then domoticz.log('Konieczność ciągłego grzania') end
			boiler.switchOn()
			boiler.switchOn().afterMin(2)
        end
        if (boiler.state == 'On' and mode.state == 'Stop') then
			if LOGGING then domoticz.log('Wymuszony koniec grzania') end
			boiler.switchOff()
			boiler.switchOff().afterMin(2)
        end  
    end
}