class Browser::Bot

def self.bot_exceptions
  @bot_exceptions ||= load_yaml("bot_exceptions.yml")
end

def self.bots
  @bots ||= load_yaml("bots.yml")
end

def self.default_matchers
  [
    EmptyUserAgentMatcher,
    KnownBotsMatcher,
    KeywordMatcher
  ]
end

def self.load_yaml(path)
  YAML.load_file(Browser.root.join(path))
end

def self.matchers
  @matchers ||= default_matchers
end

def self.search_engines
  @search_engines ||= load_yaml("search_engines.yml")
end

def self.why?(ua)
  ua = ua.downcase.strip
  browser = Browser.new(ua)
  matchers.find {|matcher| matcher.call(ua, browser) }
end

def bot?
  !bot_exception? && detect_bot?
end

def bot_exception?
lass.bot_exceptions.any? {|key| ua.include?(key) }

def detect_bot?
lass.matchers.any? {|matcher| matcher.call(ua, browser) }

def initialize(ua)
  @ua = ua.downcase.strip
  @browser = Browser.new(@ua)
end

def name
  return unless bot?
  self.class.bots.find {|key, _| ua.include?(key) }&.last || GENERIC_NAME
end

def search_engine?
  self.class.search_engines.any? {|key, _| ua.include?(key) }
end

def why?
  self.class.matchers.find {|matcher| matcher.call(ua, self) }
end