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import os

from webkitpy.common.checkout.changelog import ChangeLog

from webkitpy.tool.grammar import pluralize

from webkitpy.tool.steps.abstractstep import AbstractStep

from webkitpy.tool.steps.options import Options

from webkitpy.common.system.deprecated_logging import log, error

class UpdateChangeLogsWithReviewer(AbstractStep):

    @classmethod

    def options(cls):

        return AbstractStep.options() + [

            Options.git_commit,

            Options.reviewer,

        ]

    def _guess_reviewer_from_bug(self, bug_id):

        patches = self._tool.bugs.fetch_bug(bug_id).reviewed_patches()

        if len(patches) != 1:

            log("%s on bug %s, cannot infer reviewer." % (pluralize("reviewed patch", len(patches)), bug_id))

            return None

        patch = patches[0]

        log("Guessing \"%s\" as reviewer from attachment %s on bug %s." % (patch.reviewer().full_name, patch.id(), bug_id))

        return patch.reviewer().full_name

    def run(self, state):

        bug_id = state.get("bug_id")

        if not bug_id and state.get("patch"):

            bug_id = state.get("patch").bug_id()

        reviewer = self._options.reviewer

        if not reviewer:

            if not bug_id:

                log("No bug id provided and --reviewer= not provided.  Not updating ChangeLogs with reviewer.")

                return

            reviewer = self._guess_reviewer_from_bug(bug_id)

        if not reviewer:

            log("Failed to guess reviewer from bug %s and --reviewer= not provided.  Not updating ChangeLogs with reviewer." % bug_id)

            return

        os.chdir(self._tool.scm().checkout_root)

        for changelog_path in self.cached_lookup(state, "changelogs"):

            ChangeLog(changelog_path).set_reviewer(reviewer)