# -*- coding: utf-8 -*-
##############################################################################
#
# Copyright (c) 2005 Nexedi SARL and Contributors. All Rights Reserved.
#                    Yoshinori Okuji <yo@nexedi.com>
#                    Christophe Dumez <christophe@nexedi.com>
#               2010 Julien Muchembled <jm@nexedi.com>
#
# WARNING: This program as such is intended to be used by professional
# programmers who take the whole responsibility of assessing all potential
# consequences resulting from its eventual inadequacies and bugs
# End users who are looking for a ready-to-use solution with commercial
# guarantees and support are strongly advised to contract a Free Software
# Service Company
#
# This program 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 2
# of the License, or (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
##############################################################################

import errno, json, os, re, shutil
from base64 import b64encode, b64decode
from tempfile import gettempdir
import transaction
from AccessControl import Unauthorized
from AccessControl.SecurityInfo import ModuleSecurityInfo
from Acquisition import aq_base, Implicit
from App.config import getConfiguration
from DateTime import DateTime
from ZTUtils import make_query
from Products.ERP5.Document.BusinessTemplate import BusinessTemplateFolder
from Products.ERP5Type.Utils import simple_decorator

@simple_decorator
def selfcached(func):
  """Return a function which stores a computed value in an instance
  at the first call.
  """
  key = '_cache_' + str(id(func))
  def decorated(self, *args):
    try:
      cache = getattr(aq_base(self), key)
      return cache[args]
    except AttributeError:
      result = func(self, *args)
      setattr(self, key, {args: result})
    except KeyError:
      cache[args] = result = func(self, *args)
    return result
  return decorated

class NotAWorkingCopyError(Exception): pass
ModuleSecurityInfo(__name__).declarePublic('NotAWorkingCopyError')

class NotVersionedError(Exception): pass
ModuleSecurityInfo(__name__).declarePublic('NotVersionedError')

class BusinessTemplateNotInstalled(Exception): pass
ModuleSecurityInfo(__name__).declarePublic('BusinessTemplateNotInstalled')

class VcsConflictError(Exception): pass
ModuleSecurityInfo(__name__).declarePublic('VcsConflictError')

def issubdir(parent, child):
  return parent == child or child.startswith(parent + os.sep)

ImplicitType = type(Implicit)

class WorkingCopy(Implicit):

  __allow_access_to_unprotected_subobjects__ = 1
  _registry = []
  reference = None

  class __metaclass__(ImplicitType):

    def __init__(cls, name, bases, d):
      ImplicitType.__init__(cls, name, bases, d)
      if cls.reference:
        cls._registry.append((cls.reference, cls))

  def __init__(self, path=None):
    if path:
      self.working_copy = self.checkWorkingPath(path)

  def getWorkingCopyList(self):
    working_copy_list = []
    preferences = self.getPortalObject().portal_preferences
    for path in preferences.getPreferredWorkingCopyList():
      try:
        getVcsTool(vcs=self.reference, path=path)
        working_copy_list.append(path)
      except NotAWorkingCopyError:
        pass
    return working_copy_list

  def createBusinessTemplateWorkingCopy(self):
    """Create the working copy path corresponding to the given business template
    """
    path = os.path.join(self.working_copy, self.aq_parent.getTitle())
    os.mkdir(path)
    self.working_copy = path

  def checkWorkingPath(self, path):
    # First remove any '..' to prevent escaping.
    # Note that 'normpath' ignore symlinks so it would not do it correctly.
    parts = path.split(os.sep)
    try:
      i = len(parts) - parts[::-1].index(os.pardir)
      parts[:i] = os.realpath(parts[:i].join(os.sep)),
      path = parts.join(os.sep)
    except ValueError:
      pass
    # Allow symlinks inside instance home.
    path = os.path.normpath(path)
    real_path = os.path.realpath(path)
    for allowed in getConfiguration().instancehome, gettempdir():
      if issubdir(allowed, path) or issubdir(allowed, real_path):
        return real_path
    raise Unauthorized("Unauthorized access to path %r."
                       " It is NOT in your Zope home instance." % path)

  def _getCookie(self, name, default=None):
    try:
      return json.loads(b64decode(self.REQUEST[name]))
    except StandardError:
      return default

  def _setCookie(self, name, value, days=30):
    portal = self.getPortalObject()
    request = portal.REQUEST
    value = b64encode(json.dumps(value))
    request.set(name, value)
    if days:
      expires = (DateTime() + days).toZone('GMT').rfc822()
      request.RESPONSE.setCookie(name, value, path=portal.absolute_url_path(),
                                 expires=expires)

  # path is the path in svn working copy
  # return edit_path in zodb to edit it
  def editPath(self, path, html=False):
    """Return path to edit file
       path can be relative or absolute
    """
    if os.path.isabs(path):
      return '' # should not happen so maybe we should raise
    if path != '.' and os.path.exists(os.path.join(self.working_copy, path)):
      try:
        path = os.path.splitext(path)[0].split(os.sep)
      except ValueError:
        pass
      else:
        if path[0] != 'bt':
          path[0] = portal = self.getPortalObject().absolute_url_path()
          path.append('manage_main')
          path = '/'.join(path)
          if html:
            return '&nbsp;&nbsp;<a href="%s"><img style="border:0" alt="Edit"' \
                   ' src="%s/ERP5VCS_imgs/edit.png" /></a>' % (path, portal)
          return path
    return ''

  def getHeader(self, path):
    real_path = self.working_copy
    if path != '.':
      real_path = os.path.join(real_path, path)
    return '<a style="font-weight: bold"' \
           ' href="BusinessTemplate_viewVcsShowFile?%s">%s</a>%s' \
           % (make_query(file=path), real_path, self.editPath(path, True))

  def getRemoteComment(self):
    return

  def extractBT(self, business_template):
    """Extract business template to local working copy
    """
    if business_template.getBuildingState() == 'draft':
      business_template.edit()
    business_template.build()
    self._export(business_template)

  def _export(self, business_template):
    bta = BusinessTemplateWorkingCopy(creation=1, path=self.working_copy)
    self.addremove(*bta.export(business_template))

  def showOld(self, path):
    raise NotAWorkingCopyError

  def update(self, keep=False):
    raise NotAWorkingCopyError

  def newRevision(self):
    path = os.path.join('bt', 'revision')
    try:
      revision = int(self.showOld(path)) + 1
    except NotVersionedError:
      return 1
    with open(os.path.join(self.working_copy, path), 'w') as file:
      file.write(str(revision))
    return revision

  def hasDiff(self, path):
    try:
      hasDiff = aq_base(self).__hasDiff
    except AttributeError:
      template_tool = self.getPortalObject().portal_templates
      if template_tool.getDiffFilterScriptList():
        getFilteredDiff = template_tool.getFilteredDiff
        diff = self.diff
        hasDiff = lambda path: bool(getFilteredDiff(diff(path)))
      else:
        hasDiff = lambda path: True
      self.__hasDiff = hasDiff
    return hasDiff(path)

  def treeToXML(self, item) :
    """ Convert tree in memory to XML
    """
    output = '<?xml version="1.0" encoding="UTF-8"?>\n<tree id="0">\n'
    output = self._treeToXML(item, output)
    return output + '</tree>\n'

  def _treeToXML(self, item, output, relative_path=''):
    """
     Private function to convert recursively tree 
     in memory to XML
    """
    # Choosing a color coresponding to the status
    status = item.status
    if status == 'added':
      color = 'green'
    elif status in ('modified', 'replaced'):
      color = 'orange'
    elif status == 'deleted':
      color = 'red'
    elif status == 'conflicted':
      color = 'grey'
    elif status == 'outdated':
      color = 'purple'
    else :
      color = 'black'
    output += '<item text="%s" id="%s" aCol="%s" ' % (
      item.name, relative_path or '.', color)
    if isinstance(item, Dir):
      if not relative_path:
        output += 'open="1" '
      output += 'im0="folder.png" im1="folder_open.png" im2="folder.png">\n'
      for node in item.sub_dirs + item.sub_files:
        output = self._treeToXML(node, output,
            os.path.join(relative_path, node.name))
      output += '</item>' + os.linesep
    else :
      output += 'im0="document.png"/>\n'
    return output

  def fileHTML(self, path):
    """ Display a file content in HTML with syntax highlighting
    """
    real_path = self.working_copy
    if path != '.':
      real_path = os.path.join(real_path, path)
    head = '<span style="font-weight: bold; color: black;">%s</span>' \
           % real_path
    try:
      with open(os.path.join(self.working_copy, path), 'rU') as f:
        text = f.read()
    except IOError, e:
      if e.errno == errno.EISDIR:
        return '%s<hr/>%r is a folder!' % (head, path)
      if e.errno != errno.ENOENT:
        raise
      head += ' (removed)'
      text = self.showOld(path)
    else:
      head += self.editPath(path, True)
    return '%s<hr/><span style="font-family: monospace">%s</span>' \
           % (head, colorize(text))

  def revertZODB(self, added_file_list=(), other_file_list=(), recurse=False):
    """Revert local changes in a file or a directory
       in ZODB and on hard drive
    """
    # Transform params to list if they are not already lists
    if isinstance(added_file_list, basestring):
      added_file_list = added_file_list,
    if isinstance(other_file_list, basestring):
      other_file_list = other_file_list,

    to_revert = list(added_file_list) + list(other_file_list)
    if not to_revert:
      return
    business_template = self.aq_parent
    template_tool = business_template.getParentValue()
    installed_bt = template_tool.getInstalledBusinessTemplate(
      business_template.getTitle())
    if installed_bt is None:
      raise BusinessTemplateNotInstalled("Revert can't work if the business"
        " template is not installed. Please install it first.")

    # Reinstall removed or modified files
    object_to_update = {}
    for path in other_file_list:
      path_list = os.path.splitext(path)[0].split(os.sep)
      if path_list[0] != 'bt' and len(path_list) > 2:
        object_to_update['/'.join(path_list[2:])] = 'install'
    # remove added files
    path_added_list = []
    for path in added_file_list:
      path_list = os.path.splitext(path)[0].split(os.sep)
      if path_list[0] != 'bt' and len(path_list) > 2:
        path_added_list.append('/'.join(path_list[2:]))

    ## hack to remove objects
    if path_added_list:
      # Create a temporary bt with objects to delete
      tmp_bt = template_tool.newContent(portal_type="Business Template",
                                        temp_object=1,
                                        title='tmp_bt_revert',
                                        template_path_list=path_added_list)
      tmp_bt.edit()
      tmp_bt.build()
      # Install then uninstall it to remove objects from ZODB
      tmp_bt.install()
      tmp_bt.uninstall()

    # revert changes
    #self.revert(to_revert, recurse)
    installed_bt.reinstall(object_to_update=object_to_update, force=0)


def getVcsTool(vcs=None, path=None):
  if vcs:
    for x in WorkingCopy._registry:
      if x[0] == vcs:
        return x[1](path)
    raise ValueError("Unsupported Version Control System: %s" % vcs)
  elif path:
    for x in WorkingCopy._registry:
      try:
        return x[1](path)
      except NotAWorkingCopyError:
        pass
    raise NotAWorkingCopyError(path)
  return WorkingCopy()


class BusinessTemplateWorkingCopy(BusinessTemplateFolder):
  # only works for VCS that have a single metadata folder per working copy

  def _writeString(self, obj, path):
    self.file_set.add(path)
    self._makeParent(path)
    path = os.path.join(self.path, path)
    # write file unless unchanged
    file = None
    try:
      try:
        file = open(path, 'r+b')
      except IOError, e:
        if e.errno == errno.EISDIR:
          shutil.rmtree(path, ignore_errors=True)
        elif e.errno != errno.ENOENT:
          raise
        file = open(path, 'wb')
      else:
        old_size = os.fstat(file.fileno()).st_size
        if len(obj) == old_size and obj == file.read():
          return
        file.seek(0)
      file.write(obj)
      file.truncate()
    finally:
      if file is not None:
        file.close()

  def _makeParent(self, path):
    path = os.path.dirname(path)
    if path and path not in self.dir_set:
      self._makeParent(path)
      real_path = os.path.join(self.path, path)
      if not os.path.exists(real_path):
        os.mkdir(real_path)
      self.dir_set.add(path)

  def export(self, business_template):
    self.file_set = set()
    self.dir_set = set()
    # This will call _writeString for every exported object
    business_template.export(bta=self)
    # Remove dangling files/dirs
    removed_set = set()
    prefix_length = len(os.path.join(self.path, ''))
    for dirpath, dirnames, filenames in os.walk(self.path):
      dirpath = dirpath[prefix_length:]
      for i in xrange(len(dirnames) - 1, -1, -1):
        d = dirnames[i]
        if d[0] != '.':
          d = os.path.join(dirpath, d)
          if d in self.dir_set:
            continue
          shutil.rmtree(os.path.join(self.path, d))
          removed_set.add(d)
        del dirnames[i]
      for f in filenames:
        f = os.path.join(dirpath, f)
        if f not in self.file_set:
          os.remove(os.path.join(self.path, f))
          removed_set.add(f)
    return self.file_set, removed_set

class File(object):
  """ Class that represents a file in memory
  """
  __slots__ = ('status', 'name')
  def __init__(self, name, status):
    self.status = status
    self.name = name

class Dir(object):
  """ Class that reprensents a folder in memory
  """
  __slots__ = ('status', 'name', 'sub_dirs', 'sub_files')
  def __init__(self, name, status):
    self.status = status
    self.name = name
    self.sub_dirs = [] # list of sub directories
    self.sub_files = [] # list of sub files

  def __getitem__(self, key):
    for child in self.sub_dirs:
      if child.name == key:
        return child
    for child in self.sub_files:
      if child.name == key:
        return child
    raise KeyError(key)


from xml.sax.saxutils import escape

NBSP = '&nbsp;'
NBSP_TAB = NBSP*8

def colorizeTag(tag):
  "Return html colored item"
  text = tag.group()
  if text.startswith('#') :
    color = 'grey'
  elif text.startswith('\"') :
    color = 'red'
  elif 'string' in text:
    color = 'green'
  elif 'tuple' in text:
    color = 'orange'
  elif 'dictionary' in text:
    color = 'brown'
  elif 'item' in text:
    color = '#a1559a' #light purple
  elif 'value' in text:
    color = 'purple'
  elif 'key' in text:
    color = '#0c4f0c'#dark green
  else:
    color = 'blue'
  return "<span style='font-family: inherit; color: %s'>%s</span>" \
         % (color, text)

def colorize(text):
  """Return HTML Code with syntax hightlighting
  """
  # Escape xml before adding html tags
  html = escape(text)
  html = html.replace(' ', NBSP)
  html = html.replace('\t', NBSP_TAB)
  # Colorize comments
  pattern = re.compile(r'#.*')
  html = pattern.sub(colorizeTag, html)
  # Colorize tags
  pattern = re.compile(r'&lt;.*?&gt;')
  html = pattern.sub(colorizeTag, html)
  # Colorize strings
  pattern = re.compile(r'\".*?\"')
  html = pattern.sub(colorizeTag, html)
  html = html.replace(os.linesep, os.linesep+"<br/>")
  return html
