#!/usr/bin/env ruby
require 'getoptlong'
require 'mkmf'

target="bdb2"

opts = GetoptLong.new(
                      [ "--va", GetoptLong::NO_ARGUMENT]
                      )
opts.each do |opt,arg|
  case opt
  when '--va'
    target="bdb2a"
  end
end

message "Target is #{target}\n"

if CONFIG['INSTALL'] =~ %r{./install-sh}
  CONFIG.delete("INSTALL")
end

mj,mi,rv=RUBY_VERSION.split('.').collect {|s| s.to_i}
ri=(((mj*1000)+mi)*1000)+rv
if ri < 1008004
  $stderr.puts("Version 1.8.4 minimum required")
  exit(3)
end

inc_dir,lib_dir = dir_config(target)

$stderr.puts("lib_dir=#{lib_dir} inc_dir=#{inc_dir}")

#case Config::CONFIG["arch"]
#when /solaris2/
#  $DLDFLAGS ||= ""
#  $DLDFLAGS += " -R#{lib_dir}"
#end

versions=%w(db-4.3 db-4.2)
locations=%w(/usr/local/lib /opt/local/lib /usr/local/BerkeleyDB.4.2/lib /usr/local/BerkeleyDB.4.3/lib)
until versions.empty?
  (lib_ok=find_library(this_version=versions.shift,'db_create',*locations)) && break
end

h_locations=%w(/usr/local/include /opt/local/include /usr/local/BerkeleyDB.4.2/include /usr/local/BerkeleyDB.4.3/include)
h_headers=%w(db4/db.h db.h)
until h_headers.empty?
 (inc_ok=find_header(this_h=h_headers.shift,*h_locations)) && break
end
puts "db header is #{this_h} #{inc_ok} #$INCFLAGS"

if this_h == "db4/db.h"
  $defs << "-DINC_DB4"
else
  $defs << "-UINC_DB4"
end

puts "defs: "+$defs.inspect

# Find db.h, not sure this will work everywhere, gcc is ok
src=create_tmpsrc("#include <#{this_h}>")
cmd=cpp_command("-M")
r=`#{cmd}`
header_loc=r.split.collect {|k| k if k =~ %r{^/.*db.h} }.compact[0]
message("header is #{header_loc}\n")


inc="#include <#{this_h}>"
n=0
message("Writing bdb_aux._c (defines), this takes a while\n")
defines=[]
File.open(header_loc) {|fd|
  File.open("bdb_aux._c","w") {|hd|
    hd.puts("/* This file automatically generated by extconf.rb */\n")
    fd.each_line {|l|
      if l =~ %r{^#define\s+(DBC?_\w*)\s+(\"?)} and macro_defined?($1,inc)
        if $2 == '\"'
          hd.print(%Q{    cs(mBdb,%s);\n}%[$1])
        else
          hd.print(%Q{    ci(mBdb,%s);\n}%[$1])
        end
        message(".")
        n+=1
      end
    }
  }
  message("\nwrote #{n} defines\n")
} unless File.exist?("bdb_aux._c")

$defs << $INCFLAGS

if lib_ok and inc_ok
  create_header
  create_makefile(target)
else
  $stderr.puts("cannot create Makefile")
end