# Copyright (C) 2014  Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.


import logging

import lorrycontroller


class RemoveGhostJobs(lorrycontroller.LorryControllerRoute):

    http_method = 'POST'
    path = '/1.0/remove-ghost-jobs'

    def run(self, **kwargs):
        logging.info('%s %s called', self.http_method, self.path)

        ghost_timeout = self.app_settings['ghost-timeout']
        ghosts = []
        with self.open_statedb() as statedb:
            for job_id in statedb.get_running_jobs():
                if self.is_ghost_job(statedb, job_id, ghost_timeout):
                    self.exorcise_ghost_job(statedb, job_id)
                    ghosts.append(statedb.get_job_info(job_id))
        return {
            'killed-ghost-jobs': ghosts,
            }

    def is_ghost_job(self, statedb, job_id, ghost_timeout):
        updated = statedb.get_job_updated(job_id)
        return self.now(statedb) - updated >= ghost_timeout

    def now(self, statedb):
        return statedb.get_current_time()

    def exorcise_ghost_job(self, statedb, job_id):
        logging.info('Job %s is a ghost job', job_id)
        self.mark_job_to_be_killed_in_case_minion_appears(statedb, job_id)
        self.mark_job_as_terminated(statedb, job_id)

    def mark_job_to_be_killed_in_case_minion_appears(self, statedb, job_id):
        statedb.set_kill_job(job_id, True)

    def mark_job_as_terminated(self, statedb, job_id):
        statedb.append_to_job_output(
            job_id, '\nTERMINATED DUE TO GHOST TIMEOUT\n')
        statedb.set_job_exit(job_id, 127, self.now(statedb), -1)

        job_info = statedb.get_job_info(job_id)
        statedb.set_running_job(job_info['path'], None)