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"""Generate the Mozc data version string.

Data version consists of three components:

<ENGINE_VERSION>.<DATA_VERSION>.<TAG>

Here, <TAG> is any string to distinguish data set.
"""

import optparse
import re


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



def GetVersionString(engine_version, data_version, tag):
  return '.'.join((engine_version, data_version, tag))


def main():
  opts = _ParseOption()
  data = {}
  with open(opts.mozc_version_template, 'r') as f:
    for line in f:
      matchobj = re.match(r'(\w+) *= *(.*)', line.strip())
      if matchobj:
        key = matchobj.group(1)
        value = matchobj.group(2)
        data[key] = value
  if opts.data_version_override:
    data['DATA_VERSION'] = opts.data_version_override

  with open(opts.output, 'w') as f:
    f.write(
        GetVersionString(data['ENGINE_VERSION'], data['DATA_VERSION'], opts.tag)
    )


if __name__ == '__main__':
  main()
