#!/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
import tempfile
import shutil


class Cdist:
   """Cdist main class to hold arbitrary data"""
   version="2.0.0"

   def __init__(self, hostname):
      self.tempdir = tempfile.mkdtemp()
      self.hostname = hostname
      print(self.hostname)
      print(self.tempdir)

   def cleanup(self):
      # Do not use in __del__:
      # http://docs.python.org/reference/datamodel.html#customization
      # "other globals referenced by the __del__() method may already have been deleted 
      # or in the process of being torn down (e.g. the import machinery shutting down)"
      #
      print(self.tempdir)
      shutil.rmtree(self.tempdir)

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

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

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

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

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

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

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

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

   def base_directory(self):
      """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(self):
      return "/var/lib/cdist"

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

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

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

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

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

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

   def transfer_global_explorers(self):
      self.transfer_dir(self.global_explorer_directory(), self.remote_global_explorer_directory())

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

      self.transfer_global_explorers()
      for explorer in explorers:
         self.remote_run_or_fail([self.remote_global_explorer_path(explorer)])


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


if __name__ == "__main__":
   hostname=sys.argv[1]
#   logger("info", "cdist", cdist_version, ": Configuring host", hostname)

   for host in sys.argv[1:]:
      c = Cdist(host)
      c.deploy_to()
      print(c.list_global_explorers())
      c.cleanup()