storage-1.rb

# frozen_string_literal: true

class Storage
  class InvalidRecord
  end

  def initialize
    @storages = []
  end

  def insert(params)
    if params.nil?
      raise Storage::InvalidRecord, 'Record was invalid'
    end

    @storages << params
  end

  def delete(params)
    deleted_values = []
    deleting_key = params.keys.first
    @storages = @storages.select do |storage|
      value = storage[deleting_key]
      if deleted_values.include?(value)
        true
      elsif value == params.values.first
        deleted_values << value
        false
      else
        true
      end
    end
  end

  def count
    @storages.length
  end

  def last
    @storages[-1]
  end
end