# weather.rb
class Weather
  # Usage---
  # Controller: @weather = Weather::CurrentWeather.new(request).snapshot
  # View: render 'shared/weather/snapshot', snapshot: @weather

  WEATHER_KEY = Rails.application.secrets.open_weather_map_key
  WEATHER_ENDPOINT = Rails.application.secrets.open_weather_map_url

  def initialize(request)
    ip_address = request.remote_ip.to_s
    @location = Geocoder.search(ip_address).first
  end

  def snapshot
    Weather::Snapshot.new(get_weather)
  end

  private

  def get_weather
    JSON.parse(RestClient.get(WEATHER_ENDPOINT, params: weather_options))
  end

  def weather_options
    Hash.new.tap do |h|
      h[:appid] = WEATHER_KEY
      h[:lat] = @location.latitude
      h[:lon] = @location.longitude
    end
  end

end

# weather/snapshot.rb
class Weather::Snapshot
  attr_reader :conditions, :description, :sun, :temperature, :windspeed

  def initialize(weather_json)
    @conditions = weather_json['weather'][0]['main']
    @description = weather_json['weather'][0]['description']
    @sun = solar_hash(weather_json)
    @temperature = temperature_hash(weather_json)
    @windspeed = weather_json['wind']['speed']
  end

  def sun(rise_or_set)
    Time.at(@sun[rise_or_set]).in_time_zone(Time.zone.name).
      strftime('%b %e at %l:%M%P')
  end

  private

  def kelvin_to_fahrenheit(kelvin_value)
    (kelvin_value * 9/5 - 459.67).round
  end

  def solar_hash(weather_json)
    Hash.new.tap do |h|
      h[:set] = weather_json['sys']['sunset']
      h[:rise] = weather_json['sys']['sunrise']
    end
  end

  def temperature_hash(weather_json)
    Hash.new.tap do |h|
      h[:current] = kelvin_to_fahrenheit(weather_json['main']['temp'])
      h[:high] = kelvin_to_fahrenheit(weather_json['main']['temp_max'])
      h[:low] = kelvin_to_fahrenheit(weather_json['main']['temp_min'])
    end
  end

end