anyone help please!

Hello community, i need to execute some python codes in the server side before the window action below is calling, and after the python code executed the winodow action should be call.

menu:

          name='Inbox'
          parent="main_menu_letter_management"
          sequence="20" action="action_egp_letter_inbox_tree_view"/>

window action:

"
    Letters
    egp.letter.inbox
    tree,form
    {"default_desired_value": ""}
    [('recipients', '=', context.get('default_desired_value'))]
    
    [(False, 'tree'), (ref('egp_letter_inbox_form_view'), 'form')]
"

python function:

def open_custom_window(self):
    employee = self.env['hr.employee'].search([('user_id', '=', self.env.user.id)], limit=1)
    print('the employee gotted id', employee.id)

    departments = self.env['hr.department'].search([('manager_id', '=', employee.id)], limit=1)
    print('department gotted id ', departments.id)

    action = self.env.ref('egp_letter.action_egp_letter_inbox_tree_view')
    computed_value = departments.id
    action.write({'context': {'default_desired_value': computed_value}})

    return self.env.ref('egp_letter.action_egp_letter_inbox_tree_view')