# Copyright 2015 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Sequence extensions to server_job.
Adds ability to schedule jobs on given machines.
"""

import logging

import common
from autotest_lib.client.common_lib import control_data
from autotest_lib.server import utils
from autotest_lib.server.cros.dynamic_suite import frontend_wrappers
from autotest_lib.site_utils import job_directories

MINUTE_IN_SECS = 60
HOUR_IN_MINUTES = 60
HOUR_IN_SECS = HOUR_IN_MINUTES * MINUTE_IN_SECS
DAY_IN_HOURS = 24
DAY_IN_SECS = DAY_IN_HOURS*HOUR_IN_SECS

DEFAULT_JOB_TIMEOUT_IN_MINS = 4 * HOUR_IN_MINUTES

class SequenceJob(object):
    """Define part of a sequence that will be scheduled by the sequence test."""

    CONTROL_FILE = """
def run(machine):
    job.run_test('%s', host=hosts.create_host(machine), client_ip=machine%s)

parallel_simple(run, machines)
"""

    def __init__(self, name, args=None, iteration=1, duration=None):
        """
        Constructor

        @param name: name of the sever test to run.
        @param args: arguments needed by the server test.
        @param iteration: number of copy of this test to sechudle
        @param duration: expected duration of the test (in seconds).
        """
        self._name = name
        self._args = args or {}
        self._iteration = iteration
        self._duration = duration


    def child_job_name(self, machine, iteration_number):
        """
        Return a name for a child job.

        @param machine: machine name on which the test will run.
        @param iteration_number: number with 0 and self._iteration - 1.

        @returns a unique name based on the machine, the name and the iteration.
        """
        name_parts = [machine, self._name]
        tag = self._args.get('tag')
        if tag:
            name_parts.append(tag)
        if self._iteration > 1:
            name_parts.append(str(iteration_number))
        return '_'.join(name_parts)


    def child_job_timeout(self):
        """
        Get the child job timeout in minutes.

        @param args: arguments sent to the test.

        @returns a timeout value for the test, 4h by default.
        """
        if self._duration:
            return 2 * int(self._duration) / MINUTE_IN_SECS
        # default value:
        return DEFAULT_JOB_TIMEOUT_IN_MINS


    def child_control_file(self):
        """
        Populate the template control file.

        Populate it with the test name and expand the arguments
        list.

        @param test: name of the test to run
        @param args: dictionary of argument for this test.

        @returns a fully built control file to be use for the child job.
        """
        child_args = ['',]
        for arg, value in self._args.iteritems():
            child_args.append('%s=%s' % (arg, repr(value)))
        if self._duration:
            child_args.append('duration=%d' % self._duration)
        return self.CONTROL_FILE % (self._name, ', '.join(child_args))


    def schedule(self, job, timeout_mins, machine):
        """
        Sequence a job on the running AFE.

        Will schedule a given test on the job machine(s).
        Support a subset of tests:
        - server job
        - no hostless.
        - no cleanup around tests.

        @param job: server_job object that will server as parent.
        @param timeout_mins: timeout to set up: if the test last more than
           timeout_mins, the test will fail.
        @param machine: machine to run the test on.

        @returns a maximal time in minutes that the sequence can take.
        """
        afe = frontend_wrappers.RetryingAFE(timeout_min=30, delay_sec=10,
                                            user=job.user, debug=False)
        current_job_id = job_directories.get_job_id_or_task_id(job.resultdir)
        logging.debug('Current job id: %s', current_job_id)
        runtime_mins = self.child_job_timeout()

        for i in xrange(0, self._iteration):
            child_job_name = self.child_job_name(machine, i)
            logging.debug('Creating job: %s', child_job_name)
            afe.create_job(
                    self.child_control_file(),
                    name=child_job_name,
                    priority='Medium',
                    control_type=control_data.CONTROL_TYPE.SERVER,
                    hosts=[machine], meta_hosts=(), one_time_hosts=(),
                    atomic_group_name=None, synch_count=None, is_template=False,
                    timeout_mins=timeout_mins + (i + 1) * runtime_mins,
                    max_runtime_mins=runtime_mins,
                    run_verify=False, email_list='', dependencies=(),
                    reboot_before=None, reboot_after=None,
                    parse_failed_repair=None,
                    hostless=False, keyvals=None,
                    drone_set=None, image=None,
                    parent_job_id=current_job_id, test_retry=0, run_reset=False,
                    require_ssp=utils.is_in_container())
        return runtime_mins * self._iteration


def sequence_schedule(job, machines, server_tests):
    """
    Schedule the tests to run

    Launch all the tests in the sequence on all machines.
    Returns as soon as the jobs are launched.

    @param job: Job running.
    @param machines: machine to run on.
    @param server_tests: Array of sequence_test objects.
    """
    for machine in machines:
        timeout_mins = 0
        for test in server_tests:
            timeout_mins += test.schedule(job, timeout_mins, machine)