###############
# Damage Calc #
###############
{
  local previous_hp = 0
  
  function AnnounceDamage()
    local current_hp, max_hp = you.hp()
    
    -- Skip on game initialization
    if previous_hp == 0 then
      previous_hp = current_hp
      return
    end
    
    -- Calculate HP difference
    local hp_difference = previous_hp - current_hp
    
    -- Only show message if damage was taken
    if hp_difference > 0 then
      -- Damage taken
      if current_hp <= (max_hp * 0.30) then
        crawl.mpr("<red>You take " .. hp_difference .. " damage! (" .. current_hp .. "/" .. max_hp .. " HP)</red>")
      elseif current_hp <= (max_hp * 0.50) then
        crawl.mpr("<red>You take " .. hp_difference .. " damage. (" .. current_hp .. "/" .. max_hp .. " HP)</red>")
      elseif current_hp <= (max_hp * 0.70) then
        crawl.mpr("<lightred>You take " .. hp_difference .. " damage. (" .. current_hp .. "/" .. max_hp .. " HP)</lightred>")
      else
        crawl.mpr("You take " .. hp_difference .. " damage. (" .. current_hp .. "/" .. max_hp .. " HP)")
you.event("turn", on_turn)
      end
      
      -- Massive damage warning
      if hp_difference > (max_hp * 0.20) then
        crawl.mpr("<lightred>** MASSIVE DAMAGE! **</lightred>")
      end
    end
    
    -- Update tracking variable
    previous_hp = current_hp
  end
}