module Mutant
  class Random
    ALLOWED_SYMBOL_CHARACTERS = Array('a'..'z') + Array('A'..'Z')
    RANDOM_METHOD = Rubinius.ruby19? ? :sample : :choice

    def self.string
      ENV.fetch('RANDOM_STRING') {
        Array.new(rand(50)) { rand(126).chr }.join
      }
    end

    def self.symbol
      ENV.fetch('RANDOM_SYMBOL') {
        Array.new(rand(50).next) { ALLOWED_SYMBOL_CHARACTERS.send RANDOM_METHOD }.join
      }.to_sym
    end

    def self.fixnum
      ENV.fetch('RANDOM_FIXNUM') { rand(100) }
    end

    def self.float
      ENV.fetch('RANDOM_FLOAT') { (rand(100) + 0.5) }
    end

    def self.range
      if ENV['RANDOM_RANGE_MIN'] and ENV['RANDOM_RANGE_MAX']
        min, max = ENV['RANDOM_RANGE_MIN'].to_i, ENV['RANDOM_RANGE_MAX'].to_i
      else
        min, max = rand(50)
        max = min + rand(50)
      end

      Range.new(min, max)
    end
  end
end