Domoticz

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return {
    on = {
        devices = {
            10,  -- Gas Daily Counter
            758, -- Outside Temp
            122, -- Room Temp
            577, -- room CV setpoint
            123  -- CH Water feed temp
        }
    },
    logging = {
        level = domoticz.LOG_INFO,
        marker = "HEATING_CORRELATION"
    },
    data = {
        lastGasReading = { initial = 0 }
    },
    execute = function(dz, device)
        -- Indices
        local IDX_GAS         = 10
        local IDX_OUTSIDE     = 758
        local IDX_SETPOINT    = 577
        local IDX_WATER_SET   = 123 -- Change to your CH Water Setpoint IDX
        local IDX_VIRTUAL     = 1452 -- Your Virtual Custom Sensor IDX

        -- Fetch Devices
        local gasDevice    = dz.devices(IDX_GAS)
        local outTemp      = dz.devices(IDX_OUTSIDE).temperature
        local roomSetpoint = dz.devices(IDX_SETPOINT).setPoint
        local waterSet     = dz.devices(IDX_WATER_SET).setPoint or dz.devices(IDX_WATER_SET).sValue
        local effSensor    = dz.devices(IDX_VIRTUAL)

        -- 1. Handle Gas Usage (Daily Counter Reset Logic)
        local currentReading = gasDevice.counter
        local gasDelta = 0

        if (dz.data.lastGasReading > 0) then
            if (currentReading >= dz.data.lastGasReading) then
                gasDelta = currentReading - dz.data.lastGasReading
            else
                gasDelta = currentReading -- Midnight reset
            end
        end
        dz.data.lastGasReading = currentReading

        -- 2. Calculate "Target Delta"
        local targetDelta = roomSetpoint - outTemp

        -- 3. Update if there is heating demand
        if (targetDelta > 0) then
            if (gasDelta > 0) then
                -- Formula: Gas used / Temperature difference
                local efficiencyIndex = dz.utils.round((gasDelta / targetDelta), 5)
                
                effSensor.updateCustomSensor(efficiencyIndex)
                
                -- Log the correlation including the Boiler Water Setpoint
                dz.log('--- Heating Logic Triggered by: ' .. device.name .. ' ---', dz.LOG_INFO)
                dz.log('CH Water Setpoint: ' .. waterSet .. '°C', dz.LOG_INFO)
                dz.log('Gas Increment: ' .. gasDelta .. ' m3', dz.LOG_INFO)
                dz.log('Thermal Load: ' .. efficiencyIndex, dz.LOG_INFO)
            end
        else
            -- No demand (Outside is warmer than inside setpoint)
            if (effSensor.sensorValue ~= "0") then
                effSensor.updateCustomSensor(0)
            end
        end
    end
}