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"""Buildgen .proto files list plugin.

This parses the list of targets from the yaml build file, and creates
a list called "protos" that contains all of the proto file names.

"""


import re

LANGUAGES = [
  'core', 
  'cpp', 
  'csharp', 
  'node', 
  'objc', 
  'php',
  'python', 
  'ruby', 
  ]

class Version:

  def __init__(self, s):
    if '-' in s:
      s, self.tag = s.split('-')
    self.major, self.minor, self.patch = [int(x) for x in s.split('.')]

  def __str__(self):
    """Version string in a somewhat idiomatic style for most languages"""
    s = '%d.%d.%d' % (self.major, self.minor, self.patch)
    if self.tag:
      s += '-%s' % self.tag
    return s

  def pep440(self):
    """Version string in Python PEP440 style"""
    s = '%d.%d.%d' % (self.major, self.minor, self.patch)
    if self.tag:
      # we need to translate from grpc version tags to pep440 version
      # tags; this code is likely to be a little ad-hoc
      if self.tag == 'dev':
        s += '.dev0'
      elif len(self.tag) >= 3 and self.tag[0:3] == 'pre':
        s += 'rc%d' % int(self.tag[3:])
      else:
        raise Exception('Don\'t know how to translate version tag "%s" to pep440' % self.tag)
    return s

def mako_plugin(dictionary):
  """Expand version numbers:
     - for each language, ensure there's a language_version tag in
       settings (defaulting to the master version tag)
     - expand version strings to major, minor, patch, and tag
  """

  settings = dictionary['settings']
  master_version = Version(settings['version'])
  settings['version'] = master_version
  for language in LANGUAGES:
    version_tag = '%s_version' % language
    if version_tag in settings:
      settings[version_tag] = Version(settings[version_tag])
    else:
      settings[version_tag] = master_version