#!/usr/bin/env python
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

import json
import logging
import os
import subprocess
import sys
import threading

WORKING_DIR = os.environ.get('HEAT_SCRIPT_WORKING',
                             '/var/lib/heat-config/heat-config-script')
OUTPUTS_DIR = os.environ.get('HEAT_SCRIPT_OUTPUTS',
                             '/var/run/heat-config/heat-config-script')
LOGS_DIR = os.environ.get('HEAT_SCRIPT_LOGS',
                          '/var/log/heat-config/heat-config-script')


def prepare_dir(path, mode=0o700):
    if not os.path.isdir(path):
        os.makedirs(path, mode)


def main(argv=sys.argv):
    log = logging.getLogger('heat-config')
    handler = logging.StreamHandler(sys.stderr)
    handler.setFormatter(
        logging.Formatter(
            '[%(asctime)s] (%(name)s) [%(levelname)s] %(message)s'))
    log.addHandler(handler)
    log.setLevel('DEBUG')

    prepare_dir(OUTPUTS_DIR)
    prepare_dir(WORKING_DIR)
    prepare_dir(LOGS_DIR, mode=0o644)
    os.chdir(WORKING_DIR)

    c = json.load(sys.stdin)

    env = os.environ.copy()
    for input in c['inputs']:
        input_name = input['name']
        value = input.get('value', '')
        if isinstance(value, dict) or isinstance(value, list):
            env[input_name] = json.dumps(value)
        else:
            env[input_name] = value
        log.info('%s=%s' % (input_name, env[input_name]))

    fn = os.path.join(WORKING_DIR, c['id'])
    suffix = c.get('name', '')
    suffix = '-%s' % suffix if suffix else ''
    lp = os.path.join(LOGS_DIR, '%s%s.log' % (c['id'], suffix))
    heat_outputs_path = os.path.join(OUTPUTS_DIR, c['id'])
    env['heat_outputs_path'] = heat_outputs_path

    with os.fdopen(os.open(fn, os.O_CREAT | os.O_WRONLY, 0o700), 'w') as f:
        f.write(c.get('config', ''))

    log.debug('Running %s, logging to %s' % (fn, lp))
    subproc = subprocess.Popen([fn], env=env,
                               stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE)

    def consumer(label, fd):
        with feeder[label]:
            # NOTE: workaround read-ahead bug
            for line in iter(feeder[label].readline, b''):
                line = line.decode('utf-8', 'replace')
                logger[label](line.strip())
                deploy[label] += line
                fd.write(line)

    feeder = dict(stdout=subproc.stdout, stderr=subproc.stderr)
    deploy = dict(stdout='', stderr='')
    logger = dict(stdout=lambda line: log.info(line),
                  stderr=lambda line: log.debug(line))
    with open(lp, 'w') as fd:
        for label in ['stdout', 'stderr']:
            threading.Thread(target=consumer, args=[label, fd]).start()
        deploy_status_code = subproc.wait()

    if deploy_status_code:
        log.error("Error running %s. [%s]\n" % (fn, deploy_status_code))
    else:
        log.info('Completed %s' % fn)

    response = {}

    for output in c.get('outputs') or []:
        output_name = output['name']
        try:
            with open('%s.%s' % (heat_outputs_path, output_name)) as out:
                response[output_name] = out.read()
        except IOError:
            pass

    response.update({
        'deploy_stdout': deploy["stdout"],
        'deploy_stderr': deploy["stderr"],
        'deploy_status_code': deploy_status_code,
    })

    json.dump(response, sys.stdout)

if __name__ == '__main__':
    sys.exit(main(sys.argv))