#!/usr/bin/python3
# vi: ts=2 sw=2 et :
## Dependencies
# pip install pyhocon
# - https://github.com/chimpler/pyhocon

from pyhocon import ConfigFactory
from subprocess import Popen, PIPE, STDOUT
import subprocess
import sys
import os
import pty

def di_syscall(cmd, workdir='.'):
  #print('[dbg] CMD: %s' % (cmd))
  process = subprocess.run(cmd, capture_output=True, cwd=workdir)
  return (process.stdout.decode("utf-8").strip(), process.stderr.decode("utf-8").strip())


def di_syscall_follow(cmd):
  #print('[dbg] CMD: %s' % (cmd))
  process = Popen(cmd, stdout=PIPE, stderr=STDOUT)
  try:
    while True:
      line = process.stdout.readline()
      if not line:
        break
      else:
        print(line.decode('utf-8').strip())
  except KeyboardInterrupt:
    print('')


def di_syscall_interactive(cmd):
  #print('[dbg] CMD: %s' % (cmd))
  pty.spawn(cmd)


def print_help_exit():
  print('Use: [container.conf] command')
  exit()


def create_default_config():
  conf_d = {}
  conf_d['shell'] = 'sh'
  conf_d['upd-sig'] = 'HUP'
  return ConfigFactory.from_dict(conf_d)


def get_config(path):
  if os.path.isfile(path):
    conf = ConfigFactory.parse_file(path)
    return conf
  else:
    return None


# -------------------------- #

class Container:
  def __init__(self, conf, workdir):
    self.conf = conf
    self.workdir = workdir


  def status(self):
    self.__require_exists()

    if self.is_run():
      print('%s running' % (self.conf['title']))
    else:
      print('%s container down' % (self.conf['title']))

    out, err = di_syscall(['podman', 'logs', '--tail', '5', self.conf['name']])
    if err: print(err)
    else: print(out)


  def start(self):
    if not self.is_run():
      cmd = ['podman', 'run', '-d', '--name', self.conf['name']]
      for volume in self.conf['volumes']:
        cmd.append('--volume')
        cmd.append(volume)
      for publish in self.conf['ports']:
        cmd.append('--publish')
        cmd.append(publish)
      if self.conf.get('env', None) is not None:
        for env_name in self.conf['env'].keys():
          cmd.append('--env')
          cmd.append('%s=%s' % (env_name, self.conf['env'][env_name]))
      cmd.append(self.conf['image'])
      if self.conf.get('cmd', None) is not None:
        for arg in self.conf['cmd']:
          cmd.append('%s' % arg)

      container_id, err = di_syscall(cmd, self.workdir)
      if err:
        print('ERROR')
        print(err)
      else:
        print('Container %s started [%s]' % (self.conf['title'], container_id))
    else:
      print('%s is runned' % self.conf['title'])


  def stop(self):
    self.__require_exists()

    if self.is_run():
      print('Stop %s container...' % (self.conf['title']))
      cid, err = di_syscall(['podman', 'stop', self.conf['name']])
      if err:
        print(err)

    print('Remove %s container...' % (self.conf['title']))
    cid, err = di_syscall(['podman', 'rm', self.conf['name']])
    if err:
      print(err)


  def logs(self):
    self.__require_exists()
    di_syscall_follow(['podman', 'logs', '--tail', '10', '-f', self.conf['name']])


  def shell(self):
    self.__require_run()
    print('Enter shell in %s container...' % self.conf['title'])
    di_syscall_interactive(['podman', 'exec', '-it', self.conf['name'], self.conf['shell']])


  def update(self):
    self.__require_run()
    print('Update config %s...' % self.conf['title'])
    di_syscall(['podman', 'kill', '--signal=%s' % self.conf['upg-sig'], self.conf['name']])


  def is_run(self):
    return len(di_syscall(['podman', 'ps', '--filter', 'name=%s' % (self.conf['name']), '-q'])[0]) > 0


  def is_exists(self):
    return len(di_syscall(['podman', 'ps', '--filter', 'name=%s' % (self.conf['name']), '-qa'])[0]) > 0


  def __require_run(self):
    if not self.is_run():
      print('%s not runned' % self.conf['title'])
      exit()


  def __require_exists(self):
    if not self.is_exists():
      print('%s not exists' % self.conf['title'])
      exit()

# -------------------------- #

if len(sys.argv) == 1:
  print_help_exit()

conf = None
begin_index_commands = None
workdir = None
if os.path.isfile(sys.argv[1]):
  conf = get_config(sys.argv[1])
  begin_index_commands = 2
  workdir = os.path.dirname(sys.argv[1])
else:
  conf = get_config('container.conf')
  begin_index_commands = 1
  workdir = '.'

if conf is None:
  print_help_exit()
conf = conf.with_fallback(create_default_config())

container = Container(conf, workdir)
command = sys.argv[begin_index_commands]

if command == 'start':
  container.start()
elif command == 'status':
  container.status()
elif command == 'stop':
  container.stop()
elif command == 'logs':
  container.logs()
elif command == 'restart':
  container.stop()
  container.start()
elif command == 'shell':
  container.shell()
elif command == 'update':
  container.update()
else:
  print_help_exit()