How to calculate time_left in a timer

I tried to determine the light status using the jinja2 template, as follows:

{% set timer_state = states('timer.lamp') %}  
{% set time_left = state_attr('timer.lamp', 'remaining') | default('00:00:00') %}  

{% if timer_state in ['active', 'paused'] %}  
  {% set time_parts = time_left.split(':') %}  
  {% set total_seconds = (time_parts[0] | int * 3600) + (time_parts[1] | int * 60) + (time_parts[2] | int) %}  

  {% if total_seconds > 240 and total_seconds <= 300 %}  
    1 minute on-a  
  {% elif total_seconds > 180 and total_seconds <= 239 %}  
    1 minute on-b  
  {% elif total_seconds > 120 and total_seconds <= 179 %}  
    1 minute on-c  
  {% elif total_seconds > 0 and total_seconds <= 119 %}  
    1 minute on-d  
  {% else %}  
    Off  
  {% endif %}  
{% else %}  
  Off  
{% endif %}

Code Explanation

1. Getting Timer Status:

• timer_state retrieves the current state of the timer for the lamp.
• time_left gets the remaining time attribute from the timer, defaulting to '00:00:00' if no time is left.

2. Checking Timer State:

• The code checks if the timer is either active or paused.
• If true, it splits the time_left string into hours, minutes, and seconds.

3. Calculating Total Seconds:

• It calculates the total number of seconds remaining by converting hours to seconds, minutes to seconds, and adding them all together.

4. Determining Lamp Status:

• Based on the total seconds, it determines the status of the lamp:
  • 1 minute on-a: Between 4 minutes and 5 minutes (240 to 300 seconds).
  • 1 minute on-b: Between 3 minutes and 4 minutes (180 to 239 seconds).
  • 1 minute on-c: Between 2 minutes and 3 minutes (120 to 179 seconds).
  • 1 minute on-d: Between 0 seconds and 2 minutes (0 to 119 seconds).
  • Off: If none of the above conditions are met (e.g., if the timer has finished).

5. Off Status:

• If the timer is not active or paused, it defaults to displaying Off.

but the results of the template above only read the status of 1 minute on-a and off, while 1 minute on-b and 1 minute on-c never appear.I suspect the timer_value is not updated in real time, or maybe there are suggestions for improving the template above. Please help so that the template above can function properly, thank you

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