Add forecaster

Author: daxadax

forecaster.rb

@@ -0,0 +1,77 @@
+#!/usr/bin/env ruby
+
+require "#{ENV['HOME']}/programming/scripts/moon_info.rb"
+require 'json'
+require 'date'
+
+class Forecaster
+  URL = 'https://api.openweathermap.org/data/3.0/onecall'
+  API_KEY = ENV['OPENWEATHER_API_KEY']
+
+  def self.call(latitude, longitude)
+    new(latitude, longitude).call
+  end
+
+  def initialize(latitude, longitude)
+    @latitude = latitude
+    @longitude = longitude
+  end
+
+  def call
+    build_structure(fetch_forecast)
+  end
+
+  private
+  attr_reader :latitude, :longitude
+
+  def build_structure(forecast)
+    current = {
+      temp: forecast['current']['temp'],
+      desc: forecast['current']['weather'][0]['description'],
+      icon_url: icon_url(forecast['current']['weather'][0]['icon'])
+    }
+
+    daily = forecast['daily'].map do |day|
+      {
+        date: Time.at(day['dt']).to_date.to_s,
+        sunrise: Time.at(day['sunrise']).strftime("%H:%M"),
+        sunset: Time.at(day['sunset']).strftime("%H:%M"),
+        moon_info: MoonInfo.new(day['moon_phase']),
+        uvi: day['uvi'],
+        uv_risk: risk_from_uv(day['uvi']),
+        min_temp: day['temp']['min'],
+        max_temp: day['temp']['max'],
+        desc: day['weather'][0]['description'],
+        icon_url: icon_url(day['weather'][0]['icon'])
+      }
+    end
+
+    OpenStruct.new(current: current, daily: daily)
+  end
+
+  def risk_from_uv(uvi)
+    case uvi
+    when 0..2 then 'low'
+    when 2..5 then 'moderate'
+    when 5..7 then 'high'
+    when 7..10 then 'very_high'
+    else
+      'extreme'
+    end
+  end
+
+  def fetch_forecast
+    url = URL
+    url += "?lat=#{latitude}"
+    url += "&lon=#{longitude}"
+    url += "&appid=#{API_KEY}"
+    url += "&units=metric"
+    url += "&exclude=minutely,hourly"
+
+    JSON.parse(`curl -s '#{url}'`)
+  end
+
+  def icon_url(icon)
+    "https://openweathermap.org/img/wn/#{icon}@2x.png"
+  end
+end