#!/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
import subprocess # execute stuff
import os
import tempfile
import shutil
import logging


# Given paths from installation
BASE_DIR = os.path.abspath(os.path.join(os.path.dirname(__file__), os.pardir))
CONF_DIR                   = os.path.join(BASE_DIR, "conf")
GLOBAL_EXPLORER_DIR        = os.path.join(CONF_DIR, "explorer")
MANIFEST_DIR               = os.path.join(CONF_DIR, "manifest")

REMOTE_BASE_DIR            = "/var/lib/cdist"
REMOTE_CONF_DIR            = os.path.join(REMOTE_BASE_DIR, "conf")
REMOTE_GLOBAL_EXPLORER_DIR = os.path.join(REMOTE_CONF_DIR, "explorer")


#class Context(object):
#
#   def __init__(self, target_host):
#      self.target_host = target_host
#
#   # class variable
#   user_selber_shuld_wenn_aendert = 'bla'
#
#   # read only, aber statisch
#   @property
#   def remote_base_directory(self):
#      return "/var/lib/cdist"
#   @property.setter
#
#   @property
#   def special_foo(self):
#      return 'foo/{0}'.format(self.target_host)
#


logging.basicConfig(level=logging.DEBUG, format='%(levelname)s: %(message)s')
log = logging.getLogger()

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

   def __init__(self, hostname, initial_manifest=False):
      self.hostname = hostname

      # log.info("foobar")

      # Setup directory paths
      self.temp_dir = tempfile.mkdtemp()
      self.out_dir = os.path.join(self.temp_dir, "out")
      os.mkdir(self.out_dir)
      self.global_explorer_out_dir = os.path.join(self.out_dir, "explorer")
      os.mkdir(self.global_explorer_out_dir)

      # Mostly static, but can be overwritten on user demand
      if initial_manifest:
         self.initial_manifest = initial_manifest
      else:
         self.initial_manifest = os.path.join(MANIFEST_DIR, "init")

   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("I should cleanup " + self.temp_dir)
      # shutil.rmtree(self.temp_dir)

   def exit_error(self,*args):
      log.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 global_explorer_output_path(self, explorer):
      """Returns path of the output for a global explorer"""
      return os.path.join(self.global_explorer_out_dir, explorer)

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

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

   def transfer_global_explorers(self):
      self.transfer_dir(GLOBAL_EXPLORER_DIR, REMOTE_GLOBAL_EXPLORER_DIR)

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

      self.transfer_global_explorers()
      for explorer in explorers:
         output = self.global_explorer_output_path(explorer)
         output_fd = open(output, mode='w')
         cmd = []
         cmd.append("__explorer=" + REMOTE_GLOBAL_EXPLORER_DIR)
         cmd.append(self.remote_global_explorer_path(explorer))

         self.remote_run_or_fail(cmd, stdout=output_fd)
         output_fd.close()


   def init_deploy(self):
      log.info("Creating clean directory structure")

      # Ensure there is no old stuff, neither local nor remote
   #   remote_run_or_fail(hostname, ["rm -rf", "${__cdist_remote_base_dir}"])
   #
   #   # Create base directories
   #   remote_run_or_fail(hostname,["mkdir -p", "${__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 initial_manifes(self):
      """Run the initial manifest"""

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


if __name__ == "__main__":
   hostname=sys.argv[1]

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