#!/usr/bin/env python
# encoding: utf-8
#
# $Id$
# $URL$

"""
userconfig.py

Created by Marcus Stoegbauer on 2013-01-10.
Copyright (c) 2013 __MyCompanyName__. All rights reserved.
"""

import sys
import os
import tempfile
from checks import checks

classchecks = checks()
configdir = "../"
hostclasses = classchecks.__classesForHost__()
verbose = 1

def debug(out, level=0):
  """docstring for debug"""
  if verbose:
    if level > 0:
      print "*"*level,out
    else:
      print out
  # if verbose
# def debug

def getDEST(directory):
  """docstring for getDEST"""
  f = open(directory+"/DEST")
  destdir= f.read()[:-1]
  if destdir == "$HOME":
    destdir = os.environ['HOME']
  # if $HOME
  if not destdir.endswith("/"):
    destdir += "/"
  # if not /
  return destdir
# def getDEST

def workconf(directory, destdir, depth=2):
  """docstring for workconf"""
  dirs = os.listdir(directory)
  ret = []
  for d in dirs:
    name = directory+"/"+d
    if os.path.isdir(name):
      # fixme: create name
      workconf(name, destdir, depth+1)
    # if dir
    ret.append(name)
    debug("workconf: found file %s" % name, depth)
  # for d
  return ret
# def workconf

def workdir(directory):
  """docstring for work"""
  debug("===============================", 1)
  
  if not os.path.isfile(directory+"/DEST"):
    debug("No DEST in %s, skipping." % directory, 1)
    return
  # if not DEST
  destdir = getDEST(directory)
  # destfiles is a dict of all files that will be created from the classes config
  # key is the destination filename, values are all classes filenames that are used to
  # build the file
  destfiles = {}
  # Schritt 1: Dateien einlesen
  for h in hostclasses:
    if h[0] != "":
      classdir = directory+"/"+h[0]+"_"+h[1]
    else:
      classdir = directory+"/"+h[1]
    # if all
    if os.path.isdir(classdir):
      debug("workdir: %s" % classdir, 1)
      tempfiles = workconf(classdir, destdir)
      # tempfiles is a list of files within one classdir
      
      for f in tempfiles:
        destname = destdir+os.path.basename(f)  # destination filename
        if not destfiles.has_key(destname):
          destfiles[destname] = []
        # if not destname, create key with empty list
        destfiles[destname].append(f) # append each file to dict
      # for tempfiles
    # if classdir
  # for hostclasses
  debug("workdir: %s, Files: %s" % (directory, str(destfiles)))
  debug("^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^", 1)
  return destfiles
# def work

def buildFile(destfile, classfiles):
  """docstring for buildFile"""
  content = []
  for f in classfiles:
    fp = open(f, "r")
    content.append(fp.read())
    fp.close()
  # end f
  
  (tempfd, tempfilename) = tempfile.mkstemp(prefix=os.path.basename(destfile), dir="/tmp")
  
  fp = None
  try:
    fp = os.fdopen(tempfd, "w")
  except:
    print "Cannot write to temporary file",tempfilename
    os.remove(tempfilename)
    sys.exit(1)
  # try
  
  for block in content:
    fp.write(block)
    fp.write("\n")
  # for content
  fp.close()
  # fixme: diff tempfilename destfile
  # fixme: header marker for "is under userconfig control"
  # fixme: if diff and not under userconfig control, backup destfile
  # fixme: copy tempfilename to destfile
  # fixme: remove tempfilename
# def buildFile

def buildAllFiles(destfiles):
  """docstring for buildFiles"""
  for df in destfiles.keys():
    buildFile(df, destfiles[df])
  # for df
# def buildAllFiles

def main():
  debug("Classes for host: %s" % hostclasses)
  for d in os.listdir(configdir):
    name = configdir+d
    if not os.path.isdir(name):
      continue
    elif d.startswith(".svn"):
      continue
    elif os.path.isfile(name+"/.ignore"):
      continue
    else:
      debug("main: %s" % name)
      destfiles = workdir(name)
      buildAllFiles(destfiles)
    # if
  # for d
# def main


if __name__ == '__main__':
  main()