#!/usr/bin/env ruby

require 'optparse'
require 'fileutils'

RCS_COMMON_REPO_PATH = "../rcs-common/lib"

RCS_COMMON_GEM_GLOB = "./Ruby/lib/ruby/gems/*/gems/rcs-common*/lib"

def windows?
  RbConfig::CONFIG['host_os'] =~ /mingw/
end

def check_env!
  raise("Unable to find rcs-common repository") unless Dir.exists?(RCS_COMMON_REPO_PATH)
  raise("Unable to find rcs-common gems folder") if Dir[RCS_COMMON_GEM_GLOB].empty?
  raise("This is not a git repository") unless Dir.exists?(".git")
  raise("Cannot find git executable") if `git --version` !~ /git version/
end

def create_symlink
  remove_symlink

  Dir[RCS_COMMON_GEM_GLOB].each do |path|
    execute("rm -rf #{path}")
    execute("ln -s #{File.expand_path(RCS_COMMON_REPO_PATH)}/ #{path}")
  end
end

def remove_symlink
  check_env!

  Dir[RCS_COMMON_GEM_GLOB].each do |path|
    execute("git reset #{path}")
    execute("git clean -df #{path}")
    execute("git checkout #{path}")
  end
end

def execute(command)
  puts(command)
  system(command)
end

if windows?
  # TODO: implement windows code if you need it
  $stderr.puts("You cannot run this under Windows")
  exit!(1)
end

ARGV << "--help" if ARGV.empty?

OptionParser.new do |parser|
  parser.banner = "Usage: #{File.basename(__FILE__)} [options]\n"
  parser.on('-c', '--create', 'Create symlink') { create_symlink }
  parser.on('-r', '--remove', 'Remove symlink') { remove_symlink }
end.parse!