add helper script for reverse geocoding lat lng

lib/tasks/csv.rake

@@ -12,4 +12,49 @@ namespace :csv do
     end
   end
 
+  desc "Given a CSV file from AOI with latitude and longitude, update with city, state, country."
+  task :lat_long_to_city => :environment do |t, args|
+    require 'httparty'
+    csvdata = STDIN.read.force_encoding('UTF-8')
+    CSVBridge.parse(csvdata, {:headers => :first_row, :return_headers => true}) do |row|
+      if row.header_row?
+        row.delete('Latitude')
+        row.delete('Longitude')
+        row << ['City', 'City']
+        row << ['State', 'State']
+        row << ['Country', 'Country']
+        puts row.to_csv
+        next
+      end
+
+      lat = row['Latitude']
+      lon = row['Longitude']
+      row.delete('Latitude')
+      row.delete('Longitude')
+      key = [lat, lon]
+      opts = {
+        :query => {
+          :latlng => "#{lat},#{lon}",
+          :key => ENV['API_KEY'],
+          :location_type => 'APPROXIMATE',
+          :language => 'en',
+          :result_type => 'locality',
+        },
+        #:debug_output => STDERR,
+      }
+      resp = HTTParty.get('https://maps.googleapis.com/maps/api/geocode/json', opts)
+      if resp.parsed_response['results'].length > 0
+        addr_components = resp.parsed_response['results'][0]['address_components']
+        row << ['City', addr_components.select{ |a| a['types'].include?('locality') }[0]['long_name']]
+        row << ['State', addr_components.select{ |a| a['types'].include?('administrative_area_level_1') }[0].try(:[], 'long_name')]
+        row << ['Country', addr_components.select{ |a| a['types'].include?('country') }[0]['long_name']]
+      else
+        row << ['City', nil]
+        row << ['State', nil]
+        row << ['Country', nil]
+      end
+      puts row.to_csv
+    end
+  end
+
 end