module JpEmsFee

# File lib/jp_ems_fee.rb, line 31
def africa(weight)
  base(weight, __method__.to_s)
end

# File lib/jp_ems_fee.rb, line 7
def asia(weight)
  base(weight, __method__.to_s)
end

# File lib/jp_ems_fee.rb, line 23
def central_america(weight)
  oceania(weight)
end

# File lib/jp_ems_fee.rb, line 27
def europa(weight)
  base(weight, __method__.to_s)
end

# File lib/jp_ems_fee.rb, line 19
def middle_east(weight)
  oceania(weight)
end

# File lib/jp_ems_fee.rb, line 15
def north_america(weight)
  oceania(weight)
end

# File lib/jp_ems_fee.rb, line 11
def oceania(weight)
  base(weight, __method__.to_s)
end

# File lib/jp_ems_fee.rb, line 35
def south_america(weight)
  africa(weight)
end

# File lib/jp_ems_fee.rb, line 41
def base(weight, method_name)
  validate_weight_limit(weight)
  calculate(weight, method_name)
end

# File lib/jp_ems_fee.rb, line 54
def calculate(weight, area_name)
  yaml = YAML.load_file(File.expand_path('../../price_table.yaml', __FILE__))
  yaml[area_name].each do |r|
    if r.first >= weight
      return r[1]
    end
  end
end

# File lib/jp_ems_fee.rb, line 46
def validate_weight_limit (weight)
  if weight <= 0
    raise 'Weight Limit Under'
  elsif weight > 30000
    raise 'Weight Limit Over'
  end
end