# frozen_string_literal: false
require 'mkmf'

def check_bigdecimal_version(gemspec_path)
  message "checking RUBY_BIGDECIMAL_VERSION... "

  bigdecimal_version =
    IO.readlines(gemspec_path)
      .grep(/\Abigdecimal_version\s+=\s+/)[0][/\'([^\']+)\'/, 1]

  version_components = bigdecimal_version.split('.')
  bigdecimal_version = version_components[0, 3].join('.')
  bigdecimal_version << "-#{version_components[3]}" if version_components[3]
  $defs << %Q[-DRUBY_BIGDECIMAL_VERSION=\\"#{bigdecimal_version}\\"]

  message "#{bigdecimal_version}\n"
end

gemspec_name = gemspec_path = nil
unless ['', '../../'].any? {|dir|
         gemspec_name = "#{dir}bigdecimal.gemspec"
         gemspec_path = File.expand_path("../#{gemspec_name}", __FILE__)
         File.file?(gemspec_path)
       }
  $stderr.puts "Unable to find bigdecimal.gemspec"
  abort
end

check_bigdecimal_version(gemspec_path)

have_func("labs", "stdlib.h")
have_func("llabs", "stdlib.h")
have_func("finite", "math.h")
have_func("isfinite", "math.h")

have_type("struct RRational", "ruby.h")
have_func("rb_rational_num", "ruby.h")
have_func("rb_rational_den", "ruby.h")
have_func("rb_array_const_ptr", "ruby.h")
have_func("rb_sym2str", "ruby.h")
have_func("rb_opts_exception_p", "ruby.h")

if File.file?(File.expand_path('../lib/bigdecimal.rb', __FILE__))
  bigdecimal_rb = "$(srcdir)/lib/bigdecimal.rb"
else
  bigdecimal_rb = "$(srcdir)/../../lib/bigdecimal.rb"
end

create_makefile('bigdecimal') {|mf|
  mf << "GEMSPEC = #{gemspec_name}\n"
  mf << "BIGDECIMAL_RB = #{bigdecimal_rb}\n"
}