class ParameterParser

# File lib/pinkoi/parameter_parser.rb, line 28
def initialize
  @parameters = {}
  validate_args
end

# File lib/pinkoi/parameter_parser.rb, line 33
def build_uri
  # create a string based on the parameters
  # assuming there was error check (big assumption for now)
  @parameters.map { |k, v| "#{k}=#{v}" }.join('&')
end

# File lib/pinkoi/parameter_parser.rb, line 39
def usage
  'Usage: pinkoi [options]
    --category=(int)
    --price=[int[,int]]
    --location=[US, JP, HK, CN, TW]
    --subcategory=(int)
    --material=(int[,int,int,...])
    examples:
            pinkoi --category=1 --price=300
            pinkoi --category=1 --price=0,100
            pinkoi --category=1 --subcategory=205 --price=0,100'
end

# File lib/pinkoi/parameter_parser.rb, line 9
def validate_args
  # the home page is ajax loaded so a default parameter is set
  # to force the scraper to get data
  ARGV[0] = '--category=1' if ARGV.empty?
  ARGV.each do |arg|
    begin
      match = /--(?<key>.*?)=(?<value>.*)/.match(arg)
      fail unless @@valid_args.include?(match[:key].to_sym)
      # should also validate value to match numbers
      # in other function
      @parameters[match[:key]] = match[:value]
    rescue StandardError
      abort "invalid usage...\n" << usage << "\n\n"
    end
  end
end