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from webkitpy.common.system import logutils
from webkitpy.tool.steps.abstractstep import AbstractStep
from webkitpy.tool.steps.options import Options


_log = logutils.get_logger(__file__)


class ApplyWatchList(AbstractStep):
    @classmethod
    def options(cls):
        return AbstractStep.options() + [
            Options.git_commit,
        ]

    def run(self, state):
        diff = self.cached_lookup(state, 'diff')
        bug_id = state.get('bug_id')

        cc_and_messages = self._tool.watch_list().determine_cc_and_messages(diff)
        cc_emails = cc_and_messages['cc_list']
        messages = cc_and_messages['messages']
        if bug_id:
            # Remove emails and cc's which are already in the bug or the reporter.
            bug = self._tool.bugs.fetch_bug(bug_id)
            if not bug:
                _log.info('Unable to fetch bug {}. Skipped applying watchlist.'.format(bug_id))
                return

            messages = filter(lambda message: not bug.is_in_comments(message), messages)
            cc_emails = set(cc_emails).difference(bug.cc_emails())
            cc_emails.discard(bug.reporter_email())

        comment_text = '\n\n'.join(messages)
        if bug_id:
            if cc_emails or comment_text:
                self._tool.bugs.post_comment_to_bug(bug_id, comment_text, cc_emails)
        else:
            _log.info('No bug was updated because no id was given.')
        _log.info('Result of watchlist: cc "{}" messages "{}"'.format(', '.join(sorted(cc_emails)), comment_text))