New template for Heatpump COP calculation : How to do it?

I’ve got an Ariston Heatpump integrated via eBusd into HA.
I’m gathering all the metrics needed to calculate the COP of the HP, this in all the running configurations.
I already have a formula that calculate the instantaneous COP, based on LWT, EWT and flowmeter readings.

          {% if ((states('sensor.ebusd_heatpump_ebusd_heatpump_compressor_info_flow_meter') | float (default=0)) > 15
            and (states('sensor.ebusd_heatpump_ebusd_heatpump_heatpump_info_heatpump_mode') | string ) != 'Stand_by') %}
                   {{ ([0,(((((states('sensor.ebusd_heatpump_ebusd_heatpump_coolat_data_lwt_temp') | float (default=0)) - 0.2 - (states('sensor.ebusd_heatpump_ebusd_heatpump_coolat_data_ewt_temp') | float (default=0)) | abs) * (states('sensor.ebusd_heatpump_ebusd_heatpump_compressor_info_flow_meter') | float (default=1)) * 60 * 1.16) / (states('sensor.ebusd_heatpump_ebusd_heatpump_heatpump_power_consumption') | float (default=1))) |abs |round(2)),8]|sort)[1] }}

I’ll beautify my horrendous code following a hint found here on the forum during my search

 {% set vl = states('sensor.LWT') | float %}
  {% set rl = states('sensor.EWT') | float %}
  {% set vol = states('sensor.Flowmeter') | float * 60 %}
  {% set powercons = states('sensor.powercons') | float %}
  {% if powercons != 0 %}
    {{ ((vl - rl) | abs) * vol * 1.16) / powercons }}
  {% else %}
   ????
  {% endif %}

I need help to figure out how to add a little more complexity to the template:

• the returned value should be unavailable if the flowmeter is zero: I want to calculate average COP over longer time periods and when the HP is not running then these value should not alter average calculations

• when the heatpump is doing defrost operations
  states('sensor.ebusd_heatpump_ebusd_heatpump_heatpump_info_heatpump_mode') | string ) = 'Defrost'
• then the calculated COP should be negative, as the enegy used is not going into the house but wasted in deicing the battery
• the COP value should be limited into a range let’s say 0-8 because in some corner cases I’ve experimented in the last months the readings may lead to exaggerated values

Can you give me an hint on the syntax to obtain a credible COP calcs?

TY

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