application.rb

require "rubygems"
require "dotenv/load"
require "open-uri"
require "bundler"
require "dalli"
require "net/http"
require "forecast_io"
require "./bryant_park_api"

Bundler.require :default, (ENV["RACK_ENV"] || "development").to_sym
ForecastIO.configure do |configuration|
  configuration.api_key = ENV.fetch("DARK_SKY_API_KEY")
end

LAWN_OPEN_MESSAGES = [
  "The Lawn is open"
]

class Lawn
  WEATHER_ICONS = {
    "clear-day" => "☀️",
    "rain" => "☔️",
    "snow" => "❄️",
    "sleet" => "🌨",
    "wind" => "💨",
    "cloudy" => "⛅️",
    "partly-cloudy-day" => "🌤",
  }

  def initialize
    json = BryantParkApi.json
    @page = json["page"]
  end

  def message
    "#{lawn_status} #{page["lawnClosedExplanation"].strip}\n#{weather}"
  end

  def lawn_status
    page["lawnStatus"]
  end

  def open?
    LAWN_OPEN_MESSAGES.include? lawn_status
  end

  def weather
    forecast = ForecastIO.forecast(40.753597, -73.983231, params: {
      exclude: "hourly,daily,alerts,flags",
    })
    temp_f = forecast.currently.temperature.round
    temp_c = ((temp_f - 32) / 1.8).round
    humidity = (forecast.currently.humidity * 100).round
    weather_icon = WEATHER_ICONS.fetch(forecast.currently.icon, "")

    "#{weather_icon} #{forecast.minutely.summary} #{temp_f}°F/#{temp_c}°C/#{humidity}% humidity"
  end

  def to_json
    {
      open: open?,
      message: message,
      timestamp: Time.now
    }.to_json
  end

  private

  attr_reader :page
end

get "/" do
  cache_control :public, max_age: 300  # 5 mins.

  lawn = Lawn.new
  @lawn_message = lawn.message

  if lawn.open?
    @open = "Yes"
  else
    @open = "No"
  end

  slim :index
end

get "/api" do
  cache_control :public, max_age: 300  # 5 mins.

  content_type :json

  Lawn.new.to_json
end

get "/stylesheets/:name.css" do
  cache_control :public, max_age: 1800  # 30 mins.

  scss :"/stylesheets/#{params[:name]}"
end

get "/flush" do
  BryantParkApi.clear

  "ok"
end

get "/lawn-webcam.jpg" do
  content_type 'image/jpeg', charset: "utf-8"
  uri = URI('http://webcam.bryantpark.org/axis-cgi/jpg/image.cgi?resolution=1920x1080')

  lawn = Lawn.new
  send_lawn_image(lawn, uri)
end

get "/lawn-webcam-thumb.jpg" do
  content_type 'image/jpeg', charset: "utf-8"
  uri = URI('http://webcam.bryantpark.org/axis-cgi/jpg/image.cgi?resolution=640x480')

  lawn = Lawn.new
  send_lawn_image(lawn, uri)
end

helpers do
  def send_lawn_image(lawn, uri)
    begin
      head = Net::HTTP.start(uri.host, uri.port) do |http|
        http.head(uri.request_uri)
      end

      if head.code == "200"
        Net::HTTP.get(uri)
      else
        send_default_lawn_image(lawn)
      end
    rescue StandardError
      send_default_lawn_image(lawn)
    end
  end

  def send_default_lawn_image(lawn)
    if lawn.open?
      send_file 'public/images/open-min.jpg'
    else
      send_file 'public/images/closed-min.jpg'
    end
  end
end