# Copyright 2015, Google Inc.
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#
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# modification, are permitted provided that the following conditions are
# met:
#
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# notice, this list of conditions and the following disclaimer.
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# in the documentation and/or other materials provided with the
# distribution.
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# this software without specific prior written permission.
#
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require 'mkmf'

LIBDIR = RbConfig::CONFIG['libdir']
INCLUDEDIR = RbConfig::CONFIG['includedir']

HEADER_DIRS = [
  # Search /opt/local (Mac source install)
  '/opt/local/include',

  # Search /usr/local (Source install)
  '/usr/local/include',

  # Check the ruby install locations
  INCLUDEDIR
]

LIB_DIRS = [
  # Search /opt/local (Mac source install)
  '/opt/local/lib',

  # Search /usr/local (Source install)
  '/usr/local/lib',

  # Check the ruby install locations
  LIBDIR
]

# Check to see if GRPC_ROOT is defined or available
grpc_root = ENV['GRPC_ROOT']
if grpc_root.nil?
  r = File.expand_path(File.join(File.dirname(__FILE__), '../../../..'))
  grpc_root = r if File.exist?(File.join(r, 'include/grpc/grpc.h'))
end

# When grpc_root is available attempt to build the grpc core.
unless grpc_root.nil?
  grpc_config = ENV['GRPC_CONFIG'] || 'opt'
  if ENV.key?('GRPC_LIB_DIR')
    grpc_lib_dir = File.join(grpc_root, ENV['GRPC_LIB_DIR'])
  else
    grpc_lib_dir = File.join(File.join(grpc_root, 'libs'), grpc_config)
  end
  unless File.exist?(File.join(grpc_lib_dir, 'libgrpc.a'))
    system("make -C #{grpc_root} static_c CONFIG=#{grpc_config}")
  end
  HEADER_DIRS.unshift File.join(grpc_root, 'include')
  LIB_DIRS.unshift grpc_lib_dir
end

def crash(msg)
  print(" extconf failure: #{msg}\n")
  exit 1
end

dir_config('grpc', HEADER_DIRS, LIB_DIRS)

$CFLAGS << ' -Wno-implicit-function-declaration '
$CFLAGS << ' -Wno-pointer-sign '
$CFLAGS << ' -Wno-return-type '
$CFLAGS << ' -Wall '
$CFLAGS << ' -pedantic '

$LDFLAGS << ' -lgrpc -lgpr -lz -ldl'

crash('need grpc lib') unless have_library('grpc', 'grpc_channel_destroy')
have_library('grpc', 'grpc_channel_destroy')
crash('need gpr lib') unless have_library('gpr', 'gpr_now')
create_makefile('grpc/grpc')
