feat: add Contact class with validation for phone, telegram, and email

lab2/contact.rb

@@ -0,0 +1,52 @@
+class Contact
+  attr_reader :phone, :telegram, :email
+
+  def initialize(phone: nil, telegram: nil, email: nil)
+    @phone = phone
+    @telegram = telegram
+    @email = email
+    validate_contacts
+  end
+
+  def valid_phone_number?
+    return true if @phone.nil?
+
+    /\A\+?[0-9]{10,15}\z/.match?(@phone)
+  end
+
+  def valid_telegram?
+    return true if @telegram.nil?
+
+    /\A@[A-Za-z0-9_]{5,32}\z/.match?(@telegram)
+  end
+
+  def valid_email?
+    return true if @email.nil?
+
+    /\A[^@\s]+@[^@\s]+\.[^@\s]+\z/.match?(@email)
+  end
+
+  def present?
+    @phone || @telegram || @email
+  end
+
+  def info
+    return "Phone: #{@phone}" if @phone
+    return "Telegram: #{@telegram}" if @telegram
+    return "Email: #{@email}" if @email
+
+    'No contact available'
+  end
+
+  private
+
+  def validate_contacts
+    if !present?
+      raise ArgumentError, 'At least one contact (phone, telegram, or email) is required'
+    end
+
+    raise ArgumentError, "Invalid phone number format: #{@phone}" if @phone && !valid_phone_number?
+    raise ArgumentError, "Invalid telegram format: #{@telegram}" if @telegram && !valid_telegram?
+    raise ArgumentError, "Invalid email format: #{@email}" if @email && !valid_email?
+  end
+end