#!/usr/bin/env python
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import optparse
import re
import sys

from common_includes import *

CONFIG = {
  PERSISTFILE_BASENAME: "/tmp/v8-auto-roll-tempfile",
  DOT_GIT_LOCATION: ".git",
}


class Preparation(Step):
  MESSAGE = "Preparation."

  def RunStep(self):
    self.InitialEnvironmentChecks()
    self.CommonPrepare()


class FetchLatestRevision(Step):
  MESSAGE = "Fetching latest V8 revision."

  def RunStep(self):
    log = self.Git("svn log -1 --oneline").strip()
    match = re.match(r"^r(\d+) ", log)
    if not match:
      self.Die("Could not extract current svn revision from log.")
    self.Persist("latest", match.group(1))


class FetchLKGR(Step):
  MESSAGE = "Fetching V8 LKGR."

  def RunStep(self):
    lkgr_url = "https://v8-status.appspot.com/lkgr"
    # Retry several times since app engine might have issues.
    self.Persist("lkgr", self.ReadURL(lkgr_url, wait_plan=[5, 20, 300, 300]))


class PushToTrunk(Step):
  MESSAGE = "Pushing to trunk if possible."

  def RunStep(self):
    self.RestoreIfUnset("latest")
    self.RestoreIfUnset("lkgr")
    latest = int(self._state["latest"])
    lkgr = int(self._state["lkgr"])
    if latest == lkgr:
      print "ToT (r%d) is clean. Pushing to trunk." % latest
      # TODO(machenbach): Call push to trunk script.
    else:
      print("ToT (r%d) is ahead of the LKGR (r%d). Skipping push to trunk."
            % (latest, lkgr))


def RunAutoRoll(config,
                options,
                side_effect_handler=DEFAULT_SIDE_EFFECT_HANDLER):
  step_classes = [
    Preparation,
    FetchLatestRevision,
    FetchLKGR,
    PushToTrunk,
  ]
  RunScript(step_classes, config, options, side_effect_handler)


def BuildOptions():
  result = optparse.OptionParser()
  result.add_option("-s", "--step", dest="s",
                    help="Specify the step where to start work. Default: 0.",
                    default=0, type="int")
  return result


def Main():
  parser = BuildOptions()
  (options, args) = parser.parse_args()
  RunAutoRoll(CONFIG, options)

if __name__ == "__main__":
  sys.exit(Main())