Calendaring API in Ruby

calendar.rb

require 'date'

class Calendar
  def initialize
  end

  # start_t and end_t are Ruby DateTime objects in this and other methods
  # event creation shouldn't cause conflicts
  # if is_recurring is true, then the event recurs once a day at the given start and end times. In that case, the start and
  # end times are only used to extract the hour and minute information and not the day information
  # return an event ID

  def add_event(start_t, end_t, is_recurring: false)
  end

  # Returns Boolean - true if a meeting for this specific time period will not conflict with an existing event
  # day is a Ruby Date object
  def is_available?(start_t, end_t)
  end

  # event_id is the one returned by add_event
  # update_parameter should be required to be one of: :start_time, :end_time, or :day
  # Assume update_value is the right type - DateTime for the first 2 possible value of update_parameter; and Date for the last
  # The date portion of the provided DateTime for update value will be ignored; only the hour and minute portion should be used.
  # The method should only make changes to non-recurring events.

  def update_event(event_id, update_parameter:, update_value:)
  end
end

# Example tests.
# These are not the only test cases we will use, but these should give you a flavor of what the test cases look like.

cal = Calendar.new

id1 = cal.add_event(DateTime.new(2020, 1, 2, 2, 0), DateTime.new(2020, 1, 2, 3, 0))
recurring = cal.add_event(DateTime.new(2020, 1, 3, 5, 0), DateTime.new(2020, 1, 3, 6, 0), is_recurring: true)

cal.is_available?(DateTime.new(2020, 1, 2, 2, 0), DateTime.new(2020, 1, 2, 3, 0)) # => should return false
cal.is_available?(DateTime.new(2020, 1, 3, 2, 0), DateTime.new(2020, 1, 3, 3, 0)) # => should return true
cal.is_available?(DateTime.new(2020, 1, 13, 5, 0), DateTime.new(2020, 1, 13, 6, 0)) # => should return false

cal.is_available?(DateTime.new(2020, 1, 3, 0, 30), DateTime.new(2020, 1, 3, 1, 30)) # => should return true
cal.update_event(id1, update_parameter: :start_time, update_value: DateTime.new(2020, 1, 1, 1, 0))
cal.is_available?(DateTime.new(2020, 1, 3, 0, 30), DateTime.new(2020, 1, 3, 1, 30)) # => should return false

# Errors
# These are not all the tests; some error handling tests will reflect the specifications above.

# Raises exception because start time is past end time
cal.update_event(id1, update_parameter: :start_time, update_value: DateTime.new(2020, 1, 1, 4, 0))

# Raises exception because start time is past end time
id1 = cal.add_event(DateTime.new(2020, 1, 2, 4, 0), DateTime.new(2020, 1, 2, 3, 0))

# Raises exception because start time is in the past.
id1 = cal.add_event(DateTime.new(2019, 1, 2, 2, 0), DateTime.new(2019, 1, 2, 3, 0))