Hackathon #39 - External sources

Gemfile

source 'https://rubygems.org'

gem 'hashie', '~> 3.3.1'
gem 'httparty', '0.11.0'
gem 'restcountry'

test.rb

#!/usr/bin/env ruby

require 'httparty'
require 'json'
require 'hashie'
require 'restcountry'
require 'pry'

class WorldBankService
  def country(iso2)
    response = HTTParty.get("http://api.worldbank.org/countries/#{iso2}?format=json")
    Hashie::Mash.new(response[1][0])
  end

  def population(iso2)
    indicator(iso2, 'SP.POP.TOTL')
  end

  def gdp(iso2)
    indicator(iso2, 'NY.GDP.MKTP.CD')
  end

  def indicator(iso2, indicator_name)
    response = HTTParty.get("http://api.worldbank.org/countries/#{iso2}/indicators/#{indicator_name}?format=json&frequency=Y")
    response[1].map { |entry| Hashie::Mash.new(entry) }
  end
end

class Country
  attr_reader :name, :capital, :region, :currencies, :languages, :area
  def initialize(name)
    @rest_country = Restcountry::Country.find_by_name(name.downcase)
    wb_service = WorldBankService.new
    @world_bank_country = wb_service.country(@rest_country.alpha2Code)
    @name = @world_bank_country.name
    @capital = @world_bank_country.capital
    @region = @rest_country.region
    @currencies = @rest_country.currencies
    @languages = @rest_country.languages
    @area = @rest_country.area
    @population = wb_service.population(name.downcase)
    @gdp = wb_service.gdp(name.downcase)
  end

  def gdp
    @gdp.reduce({}) do |yearly_gdp, gross_domestic_product|
      yearly_gdp[gross_domestic_product.date] = gross_domestic_product.value
      yearly_gdp
    end.sort.to_h
  end

  def population
    @population.reduce({}) do |yearly_pop, pop|
      yearly_pop[pop.date] = pop.value
      yearly_pop
    end.sort.to_h
  end

  def to_json
    {
      name: name,
      capital: capital,
      region: region,
      currencies: currencies,
      languages: languages,
      area: area,
      population: population,
      gdp: gdp
    }.to_json
  end
end

c = Country.new(ARGV.first)
puts "#{c.name}, country in #{c.region}, which capital is #{c.capital}."
puts "With an area of #{c.area}"
puts 'Population for the last 5 years:'
c.population.sort.reverse[0..5].to_h.each do |year, pop|
  puts "  #{year}: #{pop}"
end
puts 'GDP for the last 5 years:'
c.gdp.sort.reverse[0..5].to_h.each do |year, gdp|
  puts "  #{year}: #{gdp}"
end
puts ""
puts c.to_json