#!/usr/bin/ruby
# encoding: utf-8

require 'fileutils'

if ARGV.size != 2
  $stderr.puts "Usage: #{__FILE__} <jar-file> <output-file>"
  exit 1
end

jar_path = File.expand_path(ARGV[0])
bs_path = File.expand_path(ARGV[1])

tmp_path = File.join(ENV['TMPDIR'], '__android_bridgesupport__', File.basename(jar_path))
FileUtils.rm_rf tmp_path
FileUtils.mkdir_p tmp_path

Dir.chdir(tmp_path) do
  # Unzip the .jar archive.
  exit 1 unless system "/usr/bin/unzip -q \"#{jar_path}\""

  # Decompile classes.
  classes = Dir.glob("**/*.class").map { |x| x.gsub('/', '.').gsub('$', '.').sub(/\.class$/, '') }
  javap_tmp_path = File.join(File.dirname(tmp_path), 'classes.txt')
  system "/usr/bin/javap -s #{classes.join(' ')} > \"#{javap_tmp_path}\""

  # Create the BridgeSupport text.
  bs_data = ''
  bs_data << <<EOS
<?xml version='1.0'?>
<signatures version='1.0'>
EOS
  txt = File.read(javap_tmp_path)
  res = txt.scan(/(class)\s+([^\s]+)\s+extends\s+[^{]+\s*\{([^}]+)\}/)
  res += txt.scan(/(class)\s([^\s{]+)\s*\{([^}]+)\}/) # Also grab classes without superclasses (ex. java.lang.Object)
  res += txt.scan(/(interface)\s([^\s{]+)\s*\{([^}]+)\}/) # Also grab interfaces
  res.each do |type, elem, body_txt|
    elem_path = elem.gsub(/\./, '/')
    bs_data << <<EOS
<#{type} name=\"#{elem_path}\">
EOS
    body_txt.strip.split(/\n/).each_cons(2) do |elem_line, signature_line|
      signature_line = signature_line.strip
      md = signature_line.match(/^Signature:\s+(.+)$/)
      next unless md
      signature = md[1]

      elem_line = elem_line.strip
      if md = elem_line.match(/\s([^(\s]+)\(/)
        # A method.
        method = md[1]
        if method == elem
          # An initializer.
          method = '&lt;init&gt;'
        end
        class_method = elem_line.include?('static')
        bs_data << <<EOS
<method name=\"#{method}\" type=\"#{signature}\"#{class_method ? ' class_method="true"' : ''}/>
EOS
      elsif md = elem_line.match(/\s([^;\s]+);$/)
=begin
        # A constant.
        constant = md[1] 
        bs_data << <<EOS
<const name=\"#{constant}\" type=\"#{signature}\"/>
EOS
=end
      end
    end
    bs_data << <<EOS
</#{type}>
EOS
  end
  bs_data << <<EOS
</signatures>
EOS

  # Write the BridgeSupport data down.
  File.open(bs_path, 'w') { |io| io.write(bs_data) }
end