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"""Generate a C++ array definition for file embedding."""

from __future__ import absolute_import
from __future__ import print_function
import binascii
import optparse
import os
import six
from six.moves import range


def _ParseOption():
  """Parse command line options."""
  parser = optparse.OptionParser()
  parser.add_option('--input', dest='input')
  parser.add_option('--name', dest='name')
  parser.add_option('--output', dest='output')
  return parser.parse_args()[0]


def _FormatAsUint64LittleEndian(s):
  """Formats a string as uint64 value in little endian order."""
  for _ in range(len(s), 8):
    s += six.b('\0')
  s = s[::-1]  # Reverse the string
  return six.b('0x%s') % binascii.b2a_hex(s)


def main():
  opts = _ParseOption()
  with open(opts.input, 'rb') as infile:
    with open(opts.output, 'wb') as outfile:
      outfile.write(six.b(
          '#ifdef MOZC_EMBEDDED_FILE_%(name)s\n'
          '#error "%(name)s was already included or defined elsewhere"\n'
          '#else\n'
          '#define MOZC_EMBEDDED_FILE_%(name)s\n'
          'const uint64 %(name)s_data[] = {\n'
          % {'name': opts.name}))

      while True:
        chunk = infile.read(8)
        if not chunk:
          break
        outfile.write(six.b('  '))
        outfile.write(_FormatAsUint64LittleEndian(chunk))
        outfile.write(six.b(',\n'))

      outfile.write(six.b(
          '};\n'
          'const EmbeddedFile %(name)s = {\n'
          '  %(name)s_data,\n'
          '  %(size)d,\n'
          '};\n'
          '#endif  // MOZC_EMBEDDED_FILE_%(name)s\n'
          % {'name': opts.name,
             'size': os.stat(opts.input).st_size}))


if __name__ == '__main__':
  main()
