class Github::API

def _create_instance(klass)
  klass.new(options)
end

def _extract_parameters(array)
  if array.last.is_a?(Hash) && array.last.instance_of?(Hash)
    pop
  else
    {}
  end
end

def _filter_params_keys(keys, params)
  params.reject! { |k,v| !keys.include? k }
end

def _hash_traverse(hash, &block)
  hash.each do |key, val|
    block.call(key)
    case val
    when Hash
      val.keys.each do |k|
        _hash_traverse(val, &block)
      end
    when Array
      val.each do |item|
        _hash_traverse(item, &block)
      end
    end
  end
  return hash
end

def _merge_parameters(params)
end

def _merge_user_into_params!(params)
  params.merge!({ 'user' => self.user }) if user?
end

def _merge_user_repo_into_params!(params)
  { 'user' => self.user, 'repo' => self.repo }.merge!(params)
end

def _normalize_params_keys(params)
  case params
  when Hash
    params.keys.each do |k|
      params[k.to_s] = params.delete(k)
      _normalize_params_keys(params[k.to_s])
    end
  when Array
    params.map! do |el|
      _normalize_params_keys(el)
    end
  else
    params.to_s
  end
  return params
end

def _token_required
end

def _update_user_repo_params(user_name, repo_name=nil)
  self.user = user_name || self.user
  self.repo = repo_name || self.repo
end

def _validate_inputs(required, provided)
  required.all? do |key|
    provided.has_key? key
  end
end

def _validate_params_values(options, params)
  params.each do |k, v|
    next unless options.keys.include?(k)
    if options[k].is_a?(Array) && !options[k].include?(params[k])
      raise ArgumentError, "Wrong value for #{k}, allowed: #{options[k].join(', ')}"
    elsif options[k].is_a?(Regexp) && !(options[k] =~ params[k])
      raise ArgumentError, "String does not match the parameter value."
    end
  end
end

def _validate_presence_of(*params)
  params.each do |param|
    raise ArgumentError, "parameter cannot be nil" if param.nil?
  end
end

def _validate_user_repo_params(user_name, repo_name)
  raise ArgumentError, "[user] parameter cannot be nil" if user_name.nil?
  raise ArgumentError, "[repo] parameter cannot be nil" if repo_name.nil?
end

def initialize(options = {})
  options = Github.options.merge(options)
  Configuration::VALID_OPTIONS_KEYS.each do |key|
    send("#{key}=", options[key])
  end
  @cached = Hash.new
end

def method_missing(method, *args, &block)
  if method.to_s =~ /^(.*)\?$/
    return !self.send($1.to_s).nil?
  else
    super
  end
end