# $Id$
# 
# Copyright (C) 2012 Internet Systems Consortium, Inc. ("ISC")
# 
# Permission to use, copy, modify, and/or distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
# 
# THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.

"""
Diff a series of rcynic.xml files, sort of.
"""

import sys

try:
  from lxml.etree            import ElementTree
except ImportError:
  from xml.etree.ElementTree import ElementTree

show_backup_generation = False
show_rsync_transfer = False

class Object(object):

  def __init__(self, session, uri, generation):
    self.session = session
    self.uri = uri
    self.generation = generation
    self.labels = []

  def add(self, label):
    self.labels.append(label)

  def __cmp__(self, other):
    return cmp(self.labels, other.labels)

def show(old = None, new = None):
  assert old is not None or new is not None
  assert old is None or new is None or old.uri == new.uri
  if old is None:
    obj = new
    labels = ["+" + label for label in new.labels]
  elif new is None:
    obj = old
    labels = ["-" + label for label in old.labels]
  else:
    obj = new
    labels = []
    for label in new.session.labels:
      if label in new.labels and label in old.labels:
        labels.append(label)
      elif label in new.labels:
        labels.append("+" + label)
      elif label in old.labels:
        labels.append("-" + label)
  labels = " ".join(labels)
  if show_backup_generation:
    print " ", obj.uri, obj.generation, labels
  else:
    print " ", obj.uri, labels

class Session(dict):

  def __init__(self, name):
    self.name = name
    tree = ElementTree(file = name)
    self.labels = [elt.tag.strip() for elt in tree.find("labels")]
    for elt in tree.findall("validation_status"):
      generation = elt.get("generation")
      status = elt.get("status")
      uri = elt.text.strip()
      if not show_rsync_transfer and status.startswith("rsync_transfer_"):
        continue
      if show_backup_generation:
        key = (uri, generation)
      elif generation == "backup":
        continue
      else:
        key = uri
      if key not in self:
        self[key] = Object(self, uri, generation)
      self[key].add(status)

old_db = new_db = None

for arg in sys.argv[1:]:

  old_db = new_db
  new_db = Session(arg)

  if old_db is None:
    continue

  only_old = set(old_db) - set(new_db)
  only_new = set(new_db) - set(old_db)
  changed =  set(key for key in (set(old_db) & set(new_db)) if old_db[key] != new_db[key])

  if only_old or changed or only_new:
    print "Comparing", old_db.name, "with", new_db.name
    for key in sorted(only_old):
      show(old = old_db[key])
    for key in sorted(changed):
      show(old = old_db[key], new = new_db[key])
    for key in sorted(only_new):
      show(new = new_db[key])
    print