#!/usr/bin/env python
# -*- coding: utf-8 -*-

from __future__ import print_function
import argparse
import cgi
import csv
import datetime
import json
from six.moves import http_client as httplib
import os
import shutil
import socket
import subprocess
import sys
import time
import traceback
from six.moves.urllib.request import urlopen
from six.moves.urllib.parse import urlparse
import uuid

def createStatusItem(item_directory, instance_name, callback, date, link, status):
  global app
  callback_short_name = os.path.basename(callback)
  content = json.dumps({
    'title': '%s-PBS %s : %s' % (instance_name, callback_short_name, status),
    'description': '%s run at %s' % (callback_short_name, datetime.datetime.fromtimestamp(date).isoformat()),
    'pubDate': date,
    'link': link,
  })

  item_path = os.path.join(item_directory, "status_%s" % time.time())
  with open(item_path, 'w') as file:
    file.write(content)


def main():
  parser = argparse.ArgumentParser()
  parser.add_argument('-l', '--log', nargs=1, required=True,
                      dest='logfile', metavar='logfile',
                      help="Logging file")
  parser.add_argument('-t', '--title', nargs=1, required=True,
                      help="Entry title.")
  parser.add_argument('-f', '--feed', nargs=1, required=True,
                      dest='feed_url', help="Url of the feed.")
  parser.add_argument('--notification-url', dest='notification_url',
                      nargs='*', required=True,
                      help="Notification url")
  parser.add_argument('--executable', nargs=1, dest='executable',
                      help="Executable to wrap")
  parser.add_argument('--transaction-id', nargs=1, dest='transaction_id',
                      type=int, required=False,
                      help="Additional parameter for notification-url")
  parser.add_argument('--max-run', dest='max_run',
                      type=int, default=1, required=False,
                      help="Run executable until it ends correctly, in a limit of max-run times")

  # Verbose mode
  parser.add_argument('--instance-root-name', dest='instance_root_name',
                      type=str, required=False,
                      help="Path to config file containing info on instance")
  parser.add_argument('--log-url', required=False, dest='log_url',
                      help="URL where the log file will be accessible")
  parser.add_argument('--status-item-directory', dest='status_item_directory',
                      required=False, default='', type=str,
                      help="Directory containing PBS status to publish as feed.")

  args = parser.parse_args()

  if args.instance_root_name and args.log_url and args.status_item_directory:
    # Verbose mode
    saveStatus = lambda status: createStatusItem(args.status_item_directory,
                                  args.instance_root_name,
                                  args.executable[0],
                                  time.time(),
                                  args.log_url,
                                  status)
  else:
    saveStatus = lambda status: None

  saveStatus('STARTED')

  if args.max_run <= 0:
    parser.error("--max-run argument takes a strictly positive number as argument")

  while args.max_run > 0:
    try:
      kwargs = {}
      if str is not bytes:
        kwargs['errors'] = 'replace'
      content = subprocess.check_output(
          args.executable[0],
          stderr=subprocess.STDOUT,
          **kwargs
      )
      exit_code = 0
      content = ("OK</br><p>%s ran successfully</p>"
                    "<p>Output is: </p><pre>%s</pre>" % (
            args.executable[0],
            cgi.escape(content)
        ))
      saveStatus('FINISHED')
      break
    except subprocess.CalledProcessError as e:
      args.max_run -= 1
      saveStatus('ERROR')
      content = e.output
      exit_code = e.returncode
      content = ("FAILURE</br><p>%s Failed with returncode <em>%d</em>.</p>"
                    "<p>Output is: </p><pre>%s</pre>" % (
            args.executable[0],
            exit_code,
            cgi.escape(content)
        ))

  print(content)

  # Write feed safely
  error_message = ""
  temp_file = args.logfile[0] + '.tmp'
  try:
    shutil.copy2(args.logfile[0], temp_file)
  except IOError:
    # previous feed can be rotated, only pass
    pass
  try:
    with open(temp_file, 'a') as file_:
      csvfile = csv.writer(file_)
      csvfile.writerow([
        int(time.time()),
        args.title[0],
        content,
        'slapos:%s' % uuid.uuid4(),
      ])
    os.rename(temp_file, args.logfile[0])
  except Exception as e:
    error_message = "ERROR ON WRITING FEED - %s" % str(e)
  finally:
    try:
      os.remove(temp_file)
    except OSError:
      pass

  if error_message:
    saveStatus(error_message)
    exit_code = 1

  if exit_code != 0:
    sys.exit(exit_code)

  print('Fetching %s feed...' % args.feed_url[0])

  feed = urlopen(args.feed_url[0])
  body = feed.read()

  some_notification_failed = False
  for notif_url in args.notification_url:
    notification_url = urlparse(notif_url)

    notification_port = notification_url.port
    if notification_port is None:
      notification_port = socket.getservbyname(notification_url.scheme)

    notification_path = notification_url.path
    if not notification_path.endswith('/'):
      notification_path += '/'

    transaction_id = args.transaction_id[0] if args.transaction_id else int(time.time()*1e6)
    notification_path += str(transaction_id)

    headers = {'Content-Type': feed.info().get('Content-Type')}
    try:
      notification = httplib.HTTPConnection(notification_url.hostname,
                                            notification_port)
      notification.request('POST', notification_path, body, headers)
      response = notification.getresponse()
      if not (200 <= response.status < 300):
        error_message = ("The remote server at %s didn't send a successful reponse.\n"
                         "Its response was %r\n" % (notif_url, response.reason))
        some_notification_failed = True
    except socket.error as exc:
      error_message = "Connection with remote server at %s failed:\n" % notif_url
      error_message += traceback.format_exc(exc)
      some_notification_failed = True
    finally:
      if error_message:
        sys.stderr.write(error_message)
        saveStatus('ERROR ON NOTIFYING : %s' % error_message)

  if some_notification_failed:
    sys.exit(1)

  saveStatus('OK')

if __name__ == '__main__':
  main()
