Practical - Birthdays

lib/birthday_list.rb

@@ -1 +1,41 @@
+class BirthdayList
+  def initialize
+    @list = []
+  end
 
+  def add(name, birthday)
+    @list << { name: name, birthday: birthday }
+  end
+
+  def show
+    @list.each {
+      |friend_bday| puts "#{friend_bday[:name]}, #{friend_bday[:birthday]}"
+    }
+  end
+
+  DATE_FORMAT = '%d-%m'
+
+  def check
+    @list.each do |bday| 
+      puts "#{bday[:name]}'s birthday. #{age(bday)} years old" if today?(bday)
+    end
+  end
+
+  private
+  def today?(birthday)
+    birthday_date(birthday) == today_day
+  end
+
+  def birthday_date(birthday)
+    Date.parse(birthday[:birthday]).strftime(DATE_FORMAT)
+  end
+
+  def today_day
+    Time.now.strftime(DATE_FORMAT)
+  end
+
+  def age(birthday)
+    Time.now.year - Date.parse(birthday[:birthday]).year
+  end
+
+end

spec/birthday_list_spec.rb

@@ -1 +1,71 @@
+require 'birthday_list'
+require 'timecop'
 
+describe BirthdayList do
+
+  before :example do
+    @birthday_list = BirthdayList.new
+  end
+
+  it 'adds the birthday of one friend' do
+
+    name = 'James'
+    birthday = '23/08/1993'
+
+    expect(@birthday_list.add(name, birthday)).to eq([{ name: name, birthday: birthday }])
+  end
+
+  it 'shows the birthday of two friends' do
+
+    @birthday_list.add('James', '23/08/1993')
+    expect(@birthday_list.add('Maria', '05/10/1975')).to eq([{ name: 'James', birthday: '23/08/1993' }, { name: 'Maria', birthday: '05/10/1975' }])
+  end
+
+  describe '#show' do
+    it 'shows one friend at once on a line' do
+
+      name = 'James'
+      birthday = '23/08/1993'
+
+      @birthday_list.add(name, birthday)
+      expect { @birthday_list.show }.to output("James, 23/08/1993\n").to_stdout
+    end
+
+    it 'shows two friends at once on a line' do
+
+      name_james = 'James'
+      bday_james = '23/08/1993'
+      name_maria = 'Maria'
+      bday_maria = '10/12/1945'
+
+      @birthday_list.add(name_james, bday_james)
+      @birthday_list.add(name_maria, bday_maria)
+
+      expect { @birthday_list.show }.to output("#{name_james}, #{bday_james}\n#{name_maria}, #{bday_maria}\n").to_stdout
+    end
+  end
+
+  describe '#check' do
+    context 'checks if today any friend has birthday' do
+      it 'shows message for friend who has birthday today' do
+        Timecop.freeze(Time.parse('05/05/2021'))
+
+        name = 'James'
+        birthday = '05/05/1923'
+
+        @birthday_list.add(name, birthday)
+        expect { @birthday_list.check }.to output("James's birthday. 98 years old\n").to_stdout
+      end
+
+      it 'shows nothing when no friend has birthday today' do
+        Timecop.freeze(Time.parse('05/05/2021'))
+
+        name = 'James'
+        birthday = '09/05/1923'
+
+        @birthday_list.add(name, birthday)
+        expect { @birthday_list.check }.to output("").to_stdout
+      end
+    end
+  end
+end