# frozen_string_literal: false
require 'mkmf'

def windows_platform?
  /cygwin|mingw|mswin/ === RUBY_PLATFORM
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

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

$defs << %Q[-DRUBY_BIGDECIMAL_VERSION=\\"#{bigdecimal_version}\\"]

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")

if windows_platform?
  library_base_name = "ruby-bigdecimal"
  case RUBY_PLATFORM
  when /cygwin|mingw/
    import_library_name = "libruby-bigdecimal.a"
  when /mswin/
    import_library_name = "bigdecimal-$(arch).lib"
  end
end

checking_for(checking_message("Windows")) do
  if windows_platform?
    case RUBY_PLATFORM
    when /cygwin|mingw/
      $DLDFLAGS << " $(srcdir)/bigdecimal.def"
      $DLDFLAGS << " -Wl,--out-implib=$(TARGET_SO_DIR)#{import_library_name}"
    when /mswin/
      $DLDFLAGS << " /DEF:$(srcdir)/bigdecimal.def"
    end
    $cleanfiles << import_library_name
    true
  else
    false
  end
end

create_makefile('bigdecimal') {|mf|
  mf << "\nall:\n\nextconf.h: $(srcdir)/#{gemspec_name}\n"
  case RUBY_PLATFORM
  when /mswin/
    mf << "\nall:\n\tdir $(TARGET_SO_DIR)"
  else
    mf << "\nall:\n\tls $(TARGET_SO_DIR)"
  end
}