# frozen_string_literal: true

COLUMNS = 3
files = []

def run(files)
  served = serve(files)
  sliced = slice(served)
  filled = fill(sliced)
  arranged(filled)
end

# def serve(files)
#   Dir.glob('*').each do |file|
#     files = file
#   end
# end

def serve(files)
  files.concat(Dir.glob('*'))
end

def slice(served)
  element = if (served.size % COLUMNS).zero?
              served.size / COLUMNS
            else
              served.size / COLUMNS + 1
            end
  served.each_slice(element).to_a
end

def fill(sliced)
  array_size = sliced.map(&:size).max
  sliced.each do |slice|
    slice << '' while slice.size < array_size
  end
  sliced.transpose
end

def arranged(filled)
  element2 = filled.flatten.map(&:size).max
  filled.each do |arrange|
    arrange.each do |arranged|
      print arranged.ljust(element2 + 5)
    end
    puts
  end
end

run(files)

# ls.rb:13:11: W: [Correctable] Lint/UnusedMethodArgument: Unused method argument - files. If it's necessary, use _ or _files as an argument name to indicate that it won't be used. If it's unnecessary, remove it. You can also write as serve(*) if you want the method to accept any arguments but don't care about them.
# def serve(files)
# ls.rb:27:27: C: [Correctable] Style/SymbolProc: Pass &:size as an argument to map instead of a block.
#  array_size = sliced.map { |array| array.size }.max
#  ^^^^^^^^^^^^^^^^^^^^^^
# ls.rb:34:1: C: Metrics/AbcSize: Assignment Branch Condition size for arranged is too high. [<5, 20, 6> 21.47/17]
# def arranged(filled) ...
# ^^^^^^^^^^^^^^^^^^^^
# ls.rb:34:1: C: Metrics/MethodLength: Method has too many lines. [14/10]
# def arranged(filled) ...
# ^^^^^^^^^^^^^^^^^^^^
# ls.rb:35:33: C: [Correctable] Style/SymbolProc: Pass &:size as an argument to map instead of a block.
#  element2 = filled.flatten.map { |array| array.size }.max
#  ^^^^^^^^^^^^^^^^^^^^^^
# ls.rb:43:32: W: Lint/ShadowingOuterLocalVariable: Shadowing outer local variable - arrange.
#  arrange.compact.each do |arrange|
#  ^^^^^^^