require 'mkmf'
require 'rbconfig'

HERE = File.expand_path(File.dirname(__FILE__))
BUNDLE = Dir.glob("libmemcached-*.tar.gz").first
BUNDLE_PATH = BUNDLE.sub(".tar.gz", "")

if ENV['DEBUG']
  puts "Setting debug flags."
  $CFLAGS << " -O0 -ggdb -DHAVE_DEBUG"
  $EXTRA_CONF = " --enable-debug"
end

$CFLAGS = "#{RbConfig::CONFIG['CFLAGS']} #{$CFLAGS}".gsub("$(cflags)", "")
$LDFLAGS = "#{RbConfig::CONFIG['LDFLAGS']} #{$LDFLAGS}".gsub("$(ldflags)", "")
$CXXFLAGS = " -std=gnu++98"
$CPPFLAGS = $ARCH_FLAG = $DLDFLAGS = ""

if !ENV["EXTERNAL_LIB"]
  $includes = " -I#{HERE}/include"
  $libraries = " -L#{HERE}/lib"
  $CFLAGS = "#{$includes} #{$libraries} #{$CFLAGS}"
  $LDFLAGS = "#{$libraries} #{$LDFLAGS}"
  $LIBPATH = ["#{HERE}/lib"]
  $DEFLIBPATH = []

  Dir.chdir(HERE) do
    if File.exist?("lib")
      puts "Libmemcached already built; run 'rake clean' first if you need to rebuild."
    else
      puts "Building libmemcached."
      puts(cmd = "tar xzf #{BUNDLE} 2>&1")
      raise "'#{cmd}' failed" unless system(cmd)
      
      puts "Patching libmemcached."
      puts(cmd = "patch -p1 < libmemcached.patch")
      raise "'#{cmd}' failed" unless system(cmd)

      Dir.chdir(BUNDLE_PATH) do        
        puts(cmd = "env CFLAGS='-fPIC #{$CFLAGS}' LDFLAGS='-fPIC #{$LDFLAGS}' ./configure --prefix=#{HERE} --without-memcached --disable-shared --disable-utils --disable-dependency-tracking #{$EXTRA_CONF} 2>&1")
        
        raise "'#{cmd}' failed" unless system(cmd)
        puts(cmd = "make CXXFLAGS='#{$CXXFLAGS}' || true 2>&1")
        raise "'#{cmd}' failed" unless system(cmd)
        puts(cmd = "make install || true 2>&1")
        raise "'#{cmd}' failed" unless system(cmd)
      end

      system("rm -rf #{BUNDLE_PATH}") unless ENV['DEBUG'] or ENV['DEV']
    end
  end
  
  # Absolutely prevent the linker from picking up any other libmemcached
  Dir.chdir("#{HERE}/lib") do
    system("cp -f libmemcached.a libmemcached_gem.a") 
    system("cp -f libmemcached.la libmemcached_gem.la") 
  end
  $LIBS << " -lmemcached_gem"
end

if ENV['SWIG']
  puts "Running SWIG."
  puts(cmd = "swig #{$includes} -ruby -autorename rlibmemcached.i")
  raise "'#{cmd}' failed" unless system(cmd)
end

create_makefile 'rlibmemcached'