#
# Script builded to ruby 1.9.1
#
require 'CSV'

class ArrayIterator
  #
  # Class ArrayIterator
  # Implementation of Iterator pattern
  #

  def initialize(array)
    @array = array
    @index = 0
  end

  def has_next?
    @index < @array.length
  end

  def has_prev?
    @index != 0
  end

  def item
    @array[@index]
  end

  def next_item
    value = @array[@index]
    @index += 1
    value
  end

  def prev_item
    @array[@index-1]
  end

  def same_event
    value = item
    prev_value = prev_item
    if (has_prev? and (value['session_id'] == prev_value['session_id']))
      ((value['when'].to_i - prev_value['when'].to_i) < 3600)
    else
      false
    end
  end

end

class Geekopardy
  #
  # Class to construct the statistics
  #

  def initialize
    @data = {}
  end

  def new_user(user)
    @data[user] = {} unless @data.keys.include? user
  end

  def new_visit(item)
    @data[item['session_id']]["event_#{@data[item['session_id']].size+1}"] = []
  end

  def new_view(item)
    @data[item['session_id']]["event_#{@data[item['session_id']].size}"] << item['when']
  end

  def users
    @data.keys
  end

  def events(user)
    @data[user].keys
  end

  def views(user,event)
    @data[user][event]
  end
end

file = CSV.open('events.csv','r',{:col_sep => "\t", :headers => true}).to_a

array = ArrayIterator.new(file)
geekopardy = Geekopardy.new

while array.has_next?
  item = array.item
  geekopardy.new_user item['session_id']
  geekopardy.new_visit item unless array.same_event
  geekopardy.new_view item
  array.next_item
end

#
# Print the results
# Print each timestamp of page view
#
geekopardy.users.each do |user|
  puts "--------------------- USER #{user} ---------------------"
  geekopardy.events(user).each do |event|
    puts "\t------------- #{event} -------------"
    geekopardy.views(user, event).each do |view|
      puts "\t\t" + Time.at(view.to_i).to_s
    end
  end
end

#
# Print the results
# Print a sum of page view
#
puts "\n\r\n\r"
geekopardy.users.each do |user|
  puts "--------------------- USER #{user} ---------------------"
  geekopardy.events(user).each do |event|
    puts "\t------------- #{event} -------------"
    puts "\t Pages View: " + geekopardy.views(user, event).size.to_s
  end
end