require 'mkmf'
require 'rubygems'
require 'libyajl2'

RbConfig::MAKEFILE_CONFIG['CC'] = ENV['CC'] if ENV['CC']

# pick up the vendored libyajl2 out of the libyajl2 gem
$CFLAGS = " -I#{Libyajl2.include_path} #{$CFLAGS}"
$LDFLAGS = " -L#{Libyajl2.opt_path} #{$LDFLAGS}"

# remove "-Wl,--no-undefined" flag if existent to allow for loading with dlopen
$LDFLAGS.slice!("-Wl,--no-undefined")

puts $CFLAGS
puts $LDFLAGS

# except if you're doing an unoptimized gcc install we're going to help you out a bit
if RbConfig::MAKEFILE_CONFIG['CC'] =~ /gcc|clang/
  $CFLAGS << " -O3" unless $CFLAGS[/-O\d/]
  # how many people realize that -Wall is a compiler-specific flag???
  # apparently not many based on reading lots of shitty extconf.rb's out there
  $CFLAGS << " -Wall"
end

def windows?
  !!(RUBY_PLATFORM =~ /mswin|mingw|cygwin|windows/)
end

if windows?
  # include our libyajldll.a definitions on windows in the libyajl2 gem
  $libs = "#{$libs} -lyajldll"
end

# NOTE: find_library has the side effect of adding -lyajl to the flags which we are deliberately
# avoiding doing with the libyajl2-gem (allowing it to be lazily loaded with dlopen)
if !windows? && !find_header('yajl/yajl_tree.h')
  puts "libyajl2 headers not found in libyajl2-gem, searching for system libraries..."

  HEADER_DIRS = [
    "/opt/local/include",                   # MacPorts
    "/usr/local/include",                   # /usr/local
    RbConfig::CONFIG['includedir'],         # Ruby
    "/usr/include",                         # (default)
  ]

  LIB_DIRS = [
    "/opt/local/lib",                       # MacPorts
    "/usr/local/lib",                       # /usr/local + Homebrew
    RbConfig::CONFIG['libdir'],             # Ruby
    "/usr/lib",                             # (default)
  ]

  # add --with-yajl-dir, --with-yajl-include, --with-yajl-lib
  dir_config('yajl', HEADER_DIRS, LIB_DIRS)

  # here we use find_library in order to deliberately link with -lyajl as a useful side-effect
  if !(find_header('yajl/yajl_tree.h') && find_library('yajl', 'yajl_complete_parse'))
    abort "libyajl2 is missing.  please install libyajl2"
  end
end

dir_config 'encoder'

create_makefile 'ffi_yajl/ext/encoder'
