class MagnetLink

# File lib/magnet_link.rb, line 2
def initialize(link)
  @parsed = parse_link link
  @parameters = [:xt, :tr, :dn, :kt]
end

# File lib/magnet_link.rb, line 7
def method_missing(method, *args, &block)
  super unless @parameters.include? method
  find_values(method)
end

# File lib/magnet_link.rb, line 12
def respond_to_missing?(method)
  @parameters.include? method
end

# File lib/magnet_link.rb, line 18
def find_values(parameter)
  @parsed[parameter]
end

# File lib/magnet_link.rb, line 22
def normalize_value(parameter, value)
  return value.split('+') if parameter == :kt
  return value
end

# File lib/magnet_link.rb, line 27
def parse_link(link)
  parsed = {}

  link.split('&').each do |chunk|
    match = chunk.match('(.{2})=(.+)')

    if match.nil?
      raise InvalidLink
    end

    parameter = match.captures[0].to_sym
    value = match.captures[1]

    parsed[parameter] = [] unless parsed[parameter]
    parsed[parameter].push normalize_value(parameter, value)
  end

  parsed.each_key { |key| parsed[key].flatten! }
end