class Bolt::Analytics::Client

def base_params
  {
    v: PROTOCOL_VERSION,
    # Client ID
    cid: @user_id,
    # Tracking ID
    tid: TRACKING_ID,
    # Application Name
    an: APPLICATION_NAME,
    # Application Version
    av: Bolt::VERSION,
    # Anonymize IPs
    aip: true,
    # User locale
    ul: Locale.current.to_rfc,
    # Custom Dimension 1 (Operating System)
    cd1: @os
  }
end

def compute_os
  require 'facter'
  os = Facter.value('os')
  "#{os['name']} #{os.dig('release', 'major')}"
end

def event(category, action, label: nil, value: nil, **kwargs)
  custom_dimensions = Bolt::Util.walk_keys(kwargs) do |k|
    CUSTOM_DIMENSIONS[k] || raise("Unknown analytics key '#{k}'")
  end
  event_params = {
    # Type
    t: 'event',
    # Event Category
    ec: category,
    # Event Action
    ea: action
  }.merge(custom_dimensions)
  # Event Label
  event_params[:el] = label if label
  # Event Value
  event_params[:ev] = value if value
  submit(base_params.merge(event_params))
end

def finish
  @executor.shutdown
  @executor.wait_for_termination(0.25)
end

def initialize(user_id)
  # lazy-load expensive gem code
  require 'concurrent/configuration'
  require 'concurrent/future'
  require 'httpclient'
  require 'locale'
  @logger = Bolt::Logger.logger(self)
  @http = HTTPClient.new
  @user_id = user_id
  @executor = Concurrent.global_io_executor
  @os = compute_os
  @bundled_content = {}
end

def report_bundled_content(mode, name)
  if bundled_content[mode.split.first]&.include?(name)
    event('Bundled Content', mode, label: name)
  end
end

def screen_view(screen, **kwargs)
  custom_dimensions = Bolt::Util.walk_keys(kwargs) do |k|
    CUSTOM_DIMENSIONS[k] || raise("Unknown analytics key '#{k}'")
  end
  screen_view_params = {
    # Type
    t: 'screenview',
    # Screen Name
    cd: screen
  }.merge(custom_dimensions)
  submit(base_params.merge(screen_view_params))
end

def submit(params)
  # Handle analytics submission in the background to avoid blocking the
  # app or polluting the log with errors
  Concurrent::Future.execute(executor: @executor) do
    @logger.trace "Submitting analytics: #{JSON.pretty_generate(params)}"
    @http.post(TRACKING_URL, params)
    @logger.trace "Completed analytics submission"
  end
end