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# This script is used to count how many times a user has liked or commented on your posts
# You will need to replace the variables "my_id" and "access_token" found below.
#
# Parameters: username year [month]
#
# Examples
# ruby is_friend.rb zuck 2012
# => Mark Zuckerberg has liked 0 posts and commented 1 times since January, 2013
#
# ruby is_friend.rb jimbru 2014 7
# => Jim Brusstar has liked 13 posts and commented 1 times since July, 2014

require 'json'
require 'open-uri'

my_id = 123456789 # replace with your id
access_token = 'Get from https://developers.facebook.com/tools/explorer'

user_alias, year, month = *ARGV
abort('Need user alias and year') unless(user_alias and year)

year, month = year.to_i, month.to_i
month = 1 if (month.zero?)

abort("#{year} is an invalid year") if (year < 2010 || year > DateTime.now.year)
abort("#{month} isn't a month") if (month > 12 || month < 1)

begin
  user_data = JSON.parse(URI.parse('http://graph.facebook.com/' + user_alias).read)
  user_id = user_data['id']
  user_name = user_data['name']
rescue
  abort("Couldn't get a valid user id for #{user_alias}") unless user_id
end

url = "https://graph.facebook.com/v2.1/#{my_id}/feed?access_token=#{access_token}"

like_count = comment_count = 0;
loop {
  feed = JSON.parse(URI.parse(url).read)

  feed['data'].each { |post|
    post_date = Date.parse(post['created_time'])
    break if (post_date.year < year) ||
      (post_date.year == year && post_date.month < month)
      
    post['likes']['data'].each { |like|
      like_count += 1 if like['id'] == user_id
    } unless post['likes'].nil?
    post['comments']['data'].each { |comment|
      next unless comment['from']
      comment_count += 1 if comment['from']['id'] == user_id
    } unless post['comments'].nil?
  }
  
  last_date = Date.parse(feed['data'].last['created_time'])
  break if (last_date.year < year) ||
    (last_date.year == year && last_date.month < month)
  
  url = feed['paging']['next']
}


puts "#{user_name} has liked #{like_count} posts and commented #{comment_count} times since #{Date.new(year, month).strftime('%B, %Y')}"