#!/usr/bin/env python3
#
# 2010-2011 Nico Schottelius (nico-cdist at schottelius.org)
#
# This file is part of cdist.
#
# cdist 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.
#
# cdist 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 cdist. If not, see <http://www.gnu.org/licenses/>.
#
#

import sys # argv
import subprocess # execute stuff
import os

__cdist_version="2.0.0"

def logger(type, *args):
   """Ignore type for now, support later"""
   print(*args)

def exit_error(*args):
   logger("error", *args)
   sys.exit(1)
   

def run_or_fail(*args):
   # newargs = ["echo"]
   newargs = []
   newargs.extend(*args)
   print(newargs)

   try:
      subprocess.check_call(newargs)
   except subprocess.CalledProcessError:
      exit_error("Command failed:", " ".join(newargs))

def remote_run_or_fail(hostname, *args):
   """Run something on the remote side and fail is something breaks"""
   newargs = ["ssh", "root@" + hostname]
   newargs.extend(*args)
   run_or_fail(newargs)

def remove_remote_dir(hostname, destination):
   remote_run_or_fail(hostname, ["rm", "-rf",  destination])

def transfer_dir(hostname, source, destination):
   remove_remote_dir(hostname, destination)
   run_or_fail(["scp", "-r", source, "root@" + hostname + ":" + destination])

def base_directory():
   """Returns the directory in which all cdist stuff is based in"""
   print("Going to", __file__, os.path.join(os.path.dirname(__file__), os.pardir))
   os.chdir(os.path.join(os.path.dirname(__file__), os.pardir))
   return os.getcwd()

def remote_base_directory():
   return "/var/lib/cdist"

def conf_directory():
   """Returns path to main configuration directory"""
   return os.path.join(base_directory(), "conf")

def remote_conf_directory():
   """Returns path to remote main configuration directory"""
   return os.path.join(remote_base_directory(), "conf")

def out_dir():
   FIXME: stopped - probably need static temp know!
   """Local directory containing output"""
   return os.path.join(base_directory(), "conf")

def global_explorer_directory():
   """Returns path to directory containing the global explorers"""
   return os.path.join(conf_directory(), "explorer")

def remote_global_explorer_directory():
   """Returns path to the remote directory containing the global explorers"""
   return os.path.join(remote_conf_directory(), "explorer")

def remote_global_explorer_path(explorer):
   """Returns path to the remote explorer"""
   return os.path.join(remote_global_explorer_directory(), explorer)

def list_global_explorers():
   """Return list of available explorers"""
   return os.listdir(global_explorer_directory())

def transfer_global_explorers(hostname):
   transfer_dir(hostname, global_explorer_directory(), remote_global_explorer_directory())

def global_explore(hostname):
   """Run global explorers"""
   explorers = list_global_explorers()
   if(len(explorers) == 0):
      exit_error("No explorers found in", global_explorer_directory())

   transfer_global_explorers(hostname)
   for explorer in explorers:
      remote_run_or_fail(hostname, [remote_global_explorer_path(explorer)])


def init_deploy(hostname):
   logger("info", "Creating clean directory structure")

   # Ensure there is no old stuff, neither local nor remote
#   run_or_fail(["rm -rf", "$__cdist_local_base_dir"])
#
#   remote_run_or_fail(hostname, ["rm -rf", "${__cdist_remote_base_dir}"])
#
#   # Create base directories
#   run_or_fail(["mkdir -p", "$__cdist_local_base_dir"])
#   remote_run_or_fail(hostname,["mkdir -p", "${__cdist_remote_base_dir}"])
#
#   # Link configuraion source directory - consistent with remote
#   run_or_fail(["ln -sf", "$__cdist_conf_dir", "$__cdist_local_base_dir/$__cdist_name_conf_dir"])

def cdist_deploy_to(hostname):
   """Mimic the old deploy to: Deploy to one host"""
   logger("info", "Deploying to host", hostname)
   init_deploy(hostname)
   global_explore(hostname)


if __name__ == "__main__":
   hostname=sys.argv[1]
   logger("info", "cdist", __cdist_version, ": Configuring host", hostname)
   cdist_deploy_to(hostname)
   print(list_global_explorers())