#!/usr/bin/env ruby

# -*- coding: utf-8 -*-

require 'fileutils'

SKIP_FILES = [
  '.DS_Store',
  '.sass-cache',
  'node_modules'
]

def self.fix(path)
  path.chomp('/').gsub(/([&';()\s])/, '\\\\\1')
end

def self.get_children(path)
  # because Dir.glob does not work well with sshfs mounts (at least via OSXFUSE)
  raw_children = `ls -A #{fix(path)}`
  raw_children.split("\n").map do |child_file|
    child_file
  end
end

def self.process(source, destination)
  children = get_children(source)

  children.each do |child|
    next if SKIP_FILES.include?(child)

    source_child = File.join(source, child)
    destination_child = File.join(destination, child)

    name_match = File.exists?(destination_child)

    if name_match
      size_match = File.directory?(source_child) || File.size(source_child) == File.size(destination_child)
    else
      size_match = false
    end

    match = name_match && size_match

    if match
      if File.directory?(source_child)
        puts "processing: #{fix(source_child)}"

        process(source_child, destination_child)
      end
    else
      if File.symlink?(source_child)
        symlink = File.readlink(source_child)
        puts "copy link: #{fix(source_child)} -> #{symlink}"
        FileUtils.ln_sf(symlink, destination_child)
      else
        puts "copy: #{fix(source_child)} to #{fix(destination)}"
        FileUtils.cp_r(source_child, destination, preserve: true)
      end
    end
  end
end

if ARGV.size < 2
  puts 'You MUST specify both source and destination directories!'
  exit!
elsif ARGV.size > 2
  puts 'You must ONLY specify source and destination directories!'
  exit!
elsif !(File.exists?(ARGV[0]) && File.exists?(ARGV[1]))
  puts 'You MUST specify source and destination directories that actually exist!'
  exit!
end

source = ARGV[0]
destination = ARGV[1]

# start now
start_time = Time.now.to_s

puts "Copying files from '#{source}' to '#{destination}'"

puts 'This may take several minutes'

process(source, destination)

puts "Started at: #{start_time}\tFinished at: #{Time.now.to_s}"