require 'fileutils'
require 'tmpdir'
require 'mkmf'
$:.unshift File.expand_path('../../../lib', __FILE__)
require 'openbabel/version'

ob_num_ver = OpenBabel::VERSION
ob_ver     = "openbabel-"+ob_num_ver

RUBY=File.join(RbConfig::CONFIG['bindir'],
               RbConfig::CONFIG['ruby_install_name'])

main_dir = File.expand_path(File.join(File.dirname(__FILE__),"..","..","src"))
lib_dir = File.expand_path(File.join(File.dirname(__FILE__),"..","..","src"))
Dir.mkdir main_dir
ob_main_dir = File.join(main_dir,ob_ver)
ob_bindings_dir = File.join(ob_main_dir,"scripts","ruby")

begin
  Dir.chdir main_dir do
    FileUtils.rm_rf ob_main_dir
    puts "Downloading OpenBabel sources"
    system "curl -L -d use_mirror=netcologne 'http://downloads.sourceforge.net/project/openbabel/openbabel/#{ob_num_ver}/openbabel-#{ob_num_ver}.tar.gz' | tar xz"
  end
  Dir.chdir ob_main_dir do
    puts "Configuring OpenBabel"
    system "cmake #{ob_main_dir} -DCMAKE_INSTALL_PREFIX=#{lib_dir}"
    openbabel_libs = have_library('openbabel')
    unless openbabel_libs
      puts "OpenBabel not installed. Compiling sources."
      system "make"
      system "make install"
    end
  end
  Dir.chdir ob_bindings_dir do
    puts "Compiling and instaling OpenBabel Ruby bindings."
    system "sed -i -e 's/Init_OpenBabel/Init_openbabel/g' *cpp"
    # get include and lib from pkg-config
    ob_include=`pkg-config openbabel-2.0 --cflags-only-I`.sub(/\s+/,'').sub(/-I/,'')
    ob_lib=`pkg-config openbabel-2.0 --libs-only-L`.sub(/\s+/,'').sub(/-L/,'')
    system "#{RUBY} extconf.rb --with-openbabel-include=#{ob_include} --with-openbabel-lib=#{ob_lib}"
    system "sed -i -e 's/-Wl,-flat_namespace//;s/-flat_namespace//' Makefile"
    system "make"
  end
  FileUtils.cp(ob_bindings_dir+"/openbabel.#{RbConfig::CONFIG["DLEXT"]}", "./")
	File.open('Makefile', 'w') do |makefile|
		makefile.write <<"EOF"
.PHONY: openbabel.#{RbConfig::CONFIG["DLEXT"]}
openbabel.#{RbConfig::CONFIG["DLEXT"]}:
	chmod 755 openbabel.#{RbConfig::CONFIG["DLEXT"]}

.PHONY: install
install:
	mkdir -p ../../lib/openbabel
	mv openbabel.#{RbConfig::CONFIG["DLEXT"]} ../../lib/openbabel
EOF
	end
ensure
  FileUtils.remove_entry_secure main_dir
end