foodsoft/app/lib/quantity_unit.rb

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Ruby
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2023-02-24 18:12:45 +01:00
class QuantityUnit
def initialize(quantity, unit)
@quantity = quantity
@unit = unit
end
def self.parse(number_with_unit)
# remove whitespace
number_with_unit = number_with_unit.gsub(/\s+/, '')
# to lowercase
number_with_unit = number_with_unit.downcase
# remove numerical part
number = number_with_unit.gsub(/[^0-9.,]/, '')
# remove unit part
unit = number_with_unit.gsub(/[^a-zA-Z]/, '')
# convert comma to dot
number = number.gsub(',', '.')
# convert to float
number = number.to_f
return nil unless unit.in?(%w[g kg l ml])
QuantityUnit.new(number, unit)
end
def scale_price_to_base_unit(price)
return nil unless price.is_a?(Numeric)
factor = if @unit == 'kg' || @unit == 'l'
1
elsif @unit == 'g' || @unit == 'ml'
1000
end
scaled_price = price / @quantity * factor
scaled_price.round(2)
base_unit = if @unit == 'kg' || @unit == 'g'
'kg'
elsif @unit == 'l' || @unit == 'ml'
'L'
end
[scaled_price, base_unit]
end
def to_s
"#{@quantity} #{@unit}"
end
def quantity
@quantity
end
def unit
@unit
end
end