require_relative "sheet.rb"
require 'digest'

CURRENT_BLOCK = 12345
COMMUNITY_REACTIONS = 54321

def main
  sheet = Sheet.new('Metadata/InvisibleFriends_Metadata.csv')

  sheet.headers.concat(['Seed', 'Filename', 'SHA256'])

  puts "Extending metadata"
  sheet.each do |row|
    padded_id = row["Number"].rjust(5, '0')
    gif_path = "GIFs/INVISIBLE_FRIENDS_#{padded_id}.gif"

    row["Seed"] = row["Number"]
    row["Filename"] = gif_path
    row["SHA256"] = shasum(gif_path)
    print '.'
  end
  puts ""

  sorted = sheet.dup
  sorted.data.sort! { |a, b| a.fetch("SHA256") <=> b.fetch("SHA256") }
  sorted.data.shuffle!(random: Random.new(CURRENT_BLOCK))
  sorted.data.rotate!(COMMUNITY_REACTIONS)

  sorted.each_with_index { |row, i| row['Number'] = i + 1 }

  sorted.save("Metadata/enriched_and_sorted.csv")

  combined_shasum = sorted.reduce("") { |str, row| str + row["SHA256"] }
  provenance = Digest::SHA256.hexdigest(combined_shasum)
  File.open('provenance.txt', 'w') { |f| f << provenance }
end

def shasum(path)
  `shasum -a 256 "#{path}" | awk '{ print $1 }'`.chomp
end

main