#!/usr/bin/env python2

# THIS FILE IS PART OF THE CYLC SUITE ENGINE.
# Copyright (C) 2008-2018 NIWA & British Crown (Met Office) & Contributors.
#
# 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, either version 3 of the License, or
# (at your option) any later version.
#
# 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, see <http://www.gnu.org/licenses/>.
"IBM Platform LSF bsub job submission"

import re


class LSFHandler(object):
    "IBM Platform LSF bsub job submission"

    DIRECTIVE_PREFIX = "#BSUB "
    KILL_CMD_TMPL = "bkill '%(job_id)s'"
    POLL_CMD = "bjobs"
    REC_ID_FROM_SUBMIT_OUT = re.compile(r"^Job <(?P<id>\d+)>")
    SUBMIT_CMD_TMPL = "bsub"

    @classmethod
    def filter_poll_output(cls, out, job_id):
        """Return True if job_id is in the queueing system."""
        entries = out.strip().split()
        return (len(entries) >= 3 and entries[0] == job_id and
                entries[2] not in ["DONE", "EXIT"])

    @classmethod
    def format_directives(cls, job_conf):
        """Format the job directives for a job file."""
        job_file_path = re.sub(r"\$HOME/", "", job_conf["job_file_path"])
        directives = job_conf["directives"].__class__()
        directives["-J"] = job_conf["suite_name"] + "." + job_conf["task_id"]
        directives["-o"] = job_file_path + ".out"
        directives["-e"] = job_file_path + ".err"
        if (job_conf["execution_time_limit"] and
                directives.get("-W") is None):
            directives["-W"] = "%d" % (job_conf["execution_time_limit"] / 60)
        for key, value in job_conf["directives"].items():
            directives[key] = value
        lines = []
        for key, value in directives.items():
            if value:
                lines.append("%s%s %s" % (cls.DIRECTIVE_PREFIX, key, value))
            else:
                lines.append("%s%s" % (cls.DIRECTIVE_PREFIX, key))
        return lines

    @classmethod
    def get_fail_signals(cls, _):
        """Return a list of failure signal names to trap."""
        return ["EXIT", "ERR", "XCPU", "TERM", "INT", "SIGUSR2"]

    @classmethod
    def get_submit_stdin(cls, job_file_path, _):
        """Return proc_stdin_arg, proc_stdin_value."""
        return (open(job_file_path), None)


BATCH_SYS_HANDLER = LSFHandler()
