chatmorgul

chatmorgul.rb

require 'json'
require 'set'
require 'date'

class Event
  attr_reader :event_name, :date

  def initialize(event_name, date)
    @event_name = event_name
    @date = date
  end

  def self.parse(hash)
    new(hash['event'], ::Date.parse(hash['date']))
  end

  def <=>(other)
    date <=> other.date
  end

  def eql?(other)
    event_name == other.event_name && date == other.date
  end
end

items = JSON.parse(File.read('./events.json'))
events = items.each_with_object({}) do |item, hash|
  key = item['account']
  unless hash.key?(key)
    hash[key] = SortedSet.new
  end

  evt = Event.parse(item)
  hash[key] << evt
end

lookup_date = Date.parse('April 2nd, 2020')
events.each do |key, val|
  if val.select { |evt| evt.date < lookup_date }.last.event_name != 'cancellation'
    puts "account #{key} has active subscription on #{lookup_date}"
  end
end