update dining charge down and up

app/models/dining_charge.rb

@@ -30,31 +30,43 @@ class DiningCharge < ApplicationRecord
   # dining charges calculate
   def self.charges(chargesObj, dining_minutes, type)
     solid_price = 0
+
     charge_block = DiningCharge.convert_to_minutes(chargesObj.charge_block.utc.strftime('%H:%M'))
 
     result = dining_minutes / charge_block
+
     if result.to_i < 1
       # for dining minute is under charge_block
       return 1, result.to_i,chargesObj.unit_price
     elsif result.to_i >= 1      
+
        solid_price = result * chargesObj.unit_price
 
        remain_value = dining_minutes % charge_block
+
        rounding_time = DiningCharge.convert_to_minutes(chargesObj.time_rounding_block.utc.strftime('%H:%M'))
+
        roundingblock = remain_value / rounding_time
+
+       extra_minutes = remain_value % rounding_time
+
        if roundingblock.to_i < 1
           # no time rounding block
-          return result.to_i, DiningCharge.check_rounding(chargesObj, solid_price, roundingblock)
+          return result.to_i, DiningCharge.check_rounding(chargesObj, solid_price, extra_minutes)
        else
           solid_price += (roundingblock * chargesObj.time_rounding_block_price)
-          return result.to_i, DiningCharge.check_rounding(chargesObj, solid_price, roundingblock)         
+
+          return result.to_i, DiningCharge.check_rounding(chargesObj, solid_price, extra_minutes)         
        end
     end
   end
 
   # check for rounding and calculate with rounding price
-  def self.check_rounding(chargesObj,solid_price, roundingblock)
-    rounding_block_remain = roundingblock % 1
+  def self.check_rounding(chargesObj,solid_price, extra_minutes)
+    # rounding_block_remain = roundingblock / 1
+    free_time      = DiningCharge.convert_to_minutes(chargesObj.minimum_free_time.utc.strftime('%H:%M'))
+    rounding_block_remain = extra_minutes - free_time
+    
     if chargesObj.time_rounding == "down"
      return solid_price
     else