from cm.cm_settings import VALID_EMAIL_FOR_PUBLISH, SITE_NAME
from cm.converters import convert_from_mimetype
from cm.converters.pandoc_converters import pandoc_convert
from cm.models import Text, TextVersion, Comment, Attachment
from cm.utils.files import remove_extension
from cm.utils.mail import EmailMessage
from cm.views import get_text_by_keys_or_404
from django import forms
from cm.message import display_message
from django.conf import settings
from django.core.urlresolvers import reverse
from django.forms import ModelForm
from django.forms.util import ErrorList
from django.http import HttpResponse, HttpResponseRedirect
from django.shortcuts import render_to_response
from django.template import RequestContext
from django.template.loader import render_to_string
from django.utils.translation import ugettext as _, ugettext_lazy
from django.db import connection, transaction
from mimetypes import guess_type
from cm.activity import register_activity
from cm.security import has_global_perm
import os
from BeautifulSoup import BeautifulStoneSoup
import re
from base64 import b64decode

class CreateTextUploadForm(ModelForm):
    file = forms.FileField(required=False,
                           label=ugettext_lazy("Upload file (optional)"),
                           help_text=ugettext_lazy("Upload a file from your computer instead of using the direct input above"),)

    title = forms.CharField(required=False,
                                  label=ugettext_lazy("Title"))
    class Meta:
        model = TextVersion
        fields = ('title', 'format', 'tags') #, 'note'

    def clean(self):
        cleaned_data = self.cleaned_data
        if not cleaned_data.get('file', None) :
            msg = _("You should specify a file to upload.")
            self._errors["file"] = ErrorList([msg])
              
        return cleaned_data

class CreateTextImportForm(ModelForm):
    file = forms.FileField(required=True,
                           label=ugettext_lazy("Upload XML file"),
                           help_text=ugettext_lazy("Upload a previously exported XML file from your computer"),)

    class Meta:
        model = TextVersion
        fields = ()

    def clean(self):
        cleaned_data = self.cleaned_data
        if not cleaned_data.get('file', None) :
          msg = _("You should specify a file to upload.")
          self._errors["file"] = ErrorList([msg])
          return cleaned_data

        uploaded_file = self.cleaned_data['file']
        if (uploaded_file.content_type != 'text/xml' and (uploaded_file.content_type != 'application/octet-stream' or cleaned_data.get('mime', 'application/xml') != 'application/xml')):
          msg = _("The imported file should be an XML file generated by co-ment when exporting a text and comments.")
          self._errors["file"] = ErrorList([msg])
          return cleaned_data

        soup = BeautifulStoneSoup(uploaded_file)
        if not soup.co_ment_text:
          msg = _("No co_ment_text node found in XML.")
          self._errors["file"] = ErrorList([msg])
          return cleaned_data
        for mandatory_child in ['title', 'created', 'modified', 'name', 'email', 'format', 'content']:
          if not getattr(soup.co_ment_text, mandatory_child):
            msg = _('No %(tag)s node found in XML.' %{"tag":mandatory_child})
            self._errors["file"] = ErrorList([msg])
            return cleaned_data
        cleaned_data['soup'] = soup
        return cleaned_data

class CreateTextContentForm(ModelForm):
    title = forms.CharField(required=True,
                            label=ugettext_lazy("Title"),
                            help_text=ugettext_lazy("The title of your text"),
                            widget=forms.TextInput)
    
    class Meta:
        model = TextVersion
        fields = ('title', 'format', 'content','tags') #, 'note'

@has_global_perm('can_create_text')
def text_create_content(request):
    text, rep = _text_create_content(request, CreateTextContentForm)
    return rep
    
def redirect_post_create(text) :
    return HttpResponseRedirect(reverse('text-view', args=[text.key]))

def _text_create_content(request, createForm):
    document = ""
        
    if request.method == 'POST':
        form = createForm(request.POST)
        if form.is_valid():
                text = create_text(request.user, form.cleaned_data)
                
                register_activity(request, "text_created", text)
                display_message(request, _(u'Text "%(text_title)s" has been created') %{"text_title":text.get_latest_version().title})
                return text, redirect_post_create(text)
    else:
        form = createForm()
        
    return None, render_to_response('site/text_create_content.html', {'document':document, 'form' : form}, context_instance=RequestContext(request))

def _text_create_upload(request, createForm):
    
    if request.method == 'POST':
        form = createForm(request.POST, request.FILES)
        if form.is_valid():
            # should convert?
            if form.cleaned_data['file']:
                try:
                    uploaded_file = form.cleaned_data['file']
                    content, attachs = convert_from_mimetype(uploaded_file.temporary_file_path(),
                                                    uploaded_file.content_type,
                                                    format=form.cleaned_data['format'],
                                                    )
                    form.cleaned_data['content'] = content
                    form.cleaned_data['attachs'] = attachs
                    
                    # set title if not present
                    if not form.cleaned_data.get('title', None):
                        form.cleaned_data['title'] = remove_extension(uploaded_file.name)
                        
                    del form.cleaned_data['file']
                except:
                    raise
                
            text = create_text(request.user, form.cleaned_data)
            
            register_activity(request, "text_created", text)
            
            display_message(request, _(u'Text "%(text_title)s" has been created')%{"text_title":text.get_latest_version().title})
            return text, redirect_post_create(text)

    else:
        form = createForm()
        
    return None, render_to_response('site/text_create_upload.html', {'form' : form}, context_instance=RequestContext(request))

def _text_create_import(request, createForm):
  if request.method == 'POST':
    form = createForm(request.POST, request.FILES)
    if form.is_valid():
      soup = form.cleaned_data['soup']
      if not soup.co_ment_text:
        raise Exception('Bad Soup')

      # Process attachments first to create new keys.
      attachments_keys_map = {}
      if soup.co_ment_text.attachments:
        for imported_attachement in soup.co_ment_text.attachments.findAll('attachment'):
          # Creates attachment object.
          filename = 'imported_attachment'
          attachment = Attachment.objects.create_attachment(filename=filename, data=b64decode(imported_attachement.data.renderContents()), text_version=None)
          # Stores key mapping.
          attachments_keys_map[imported_attachement.key.renderContents()] = attachment.key

      # Process text.
      form.cleaned_data['title'] = soup.co_ment_text.title.renderContents()
      form.cleaned_data['format'] = soup.co_ment_text.format.renderContents()
      form.cleaned_data['content'] = re.sub(r'^<!\[CDATA\[|\]\]>$', '', soup.co_ment_text.content.renderContents())
      form.cleaned_data['name'] = soup.co_ment_text.find('name').renderContents()
      form.cleaned_data['email'] = soup.co_ment_text.email.renderContents()
      if soup.co_ment_text.tags:
        form.cleaned_data['tags'] = soup.co_ment_text.tags.renderContents()

      # Replaces attachements keys in content.
      for old_key in attachments_keys_map.keys():
        form.cleaned_data['content'] = re.sub(old_key, attachments_keys_map[old_key], form.cleaned_data['content'])
      form.cleaned_data['content'] = re.sub(r'src="/attach/', 'src="' + settings.SITE_URL + '/attach/', form.cleaned_data['content'])

      # Creates text.
      text = create_text(request.user, form.cleaned_data)

      # Brute updates of dates (cannot do it through django models since fields are set with auto_now or auto_now_add).
      created = soup.co_ment_text.created.renderContents()
      modified = soup.co_ment_text.modified.renderContents()
      cursor = connection.cursor()
      cursor.execute("UPDATE cm_textversion SET created = %s, modified = %s WHERE id = %s", [created, modified, text.last_text_version_id])
      cursor.execute("UPDATE cm_text SET created = %s, modified = %s WHERE id = %s", [created, modified, text.id])
      transaction.commit_unless_managed()

      # Process comments.
      if soup.co_ment_text.comments:
        comments_ids_map = {}
        for imported_comment in soup.co_ment_text.comments.findAll('comment'):
          # Creates each comment.
          comment = Comment.objects.create(
              text_version=text.get_latest_version(),
              title=imported_comment.title.renderContents(),
              state=imported_comment.state.renderContents(),
              name=imported_comment.find('name').renderContents(),
              email=imported_comment.email.renderContents(),
              format=imported_comment.format.renderContents(),
              content=re.sub(r'^<!\[CDATA\[|\]\]>$', '', imported_comment.content.renderContents()),
              content_html=re.sub(r'^<!\[CDATA\[|\]\]>$', '', imported_comment.content_html.renderContents()),
              )

          # Stores id for reply_to mapping.
          comments_ids_map[imported_comment.id.renderContents()] = comment

          # Process boolean and potentially null integer/foreign key attributes.
          save = False
          if imported_comment.deleted.renderContents() == 'True':
            comment.deleted = True
            save = True
          if imported_comment.start_wrapper.renderContents() != 'None':
            comment.start_wrapper = imported_comment.start_wrapper.renderContents()
            save = True
          if imported_comment.end_wrapper.renderContents() != 'None':
            comment.end_wrapper = imported_comment.end_wrapper.renderContents()
            save = True
          if imported_comment.start_offset.renderContents() != 'None':
            comment.start_offset = imported_comment.start_offset.renderContents()
            save = True
          if imported_comment.end_offset.renderContents() != 'None':
            comment.end_offset = imported_comment.end_offset.renderContents()
            save = True
          if imported_comment.find('parent'):
            comment.reply_to = comments_ids_map.get(imported_comment.find('parent').renderContents())
            save = True
          if save:
            comment.save()

          # Brute updates of dates (cannot do it through django models since fields are set with auto_now or auto_now_add).
          created=imported_comment.created.renderContents(),
          modified=imported_comment.modified.renderContents(),
          cursor.execute("UPDATE cm_comment SET created = %s, modified = %s WHERE id = %s", [created, modified, comment.id])
          transaction.commit_unless_managed()

      # Logs on activity.
      register_activity(request, "text_imported", text)
      display_message(request, _(u'Text "%(text_title)s" has been imported')%{"text_title":text.get_latest_version().title})
      return text, HttpResponseRedirect(reverse('text-view', args=[text.key]))
  else:
    form = createForm()

  return None, render_to_response('site/text_create_import.html', {'form' : form}, context_instance=RequestContext(request))


@has_global_perm('can_create_text')
def text_create_upload(request):
    text, rep = _text_create_upload(request, CreateTextUploadForm)
    return rep

def text_create_import(request):
    text, rep = _text_create_import(request, CreateTextImportForm)
    return rep

def create_text(user, data):
    text = Text.objects.create_text(title=data['title'],
                                    format=data['format'],
                                    content=data['content'],
                                    note=data.get('note', None),
                                    name=data.get('name', None),
                                    email=data.get('email', None),
                                    tags=data.get('tags', None),
                                    user=user
                                    )
    text.update_denorm_fields()
    text_version = text.get_latest_version()
    text_content = text_version.content

    for attach_file in data.get('attachs',  []):
        attach_data = file(attach_file, 'rb').read()
        filename = os.path.basename(attach_file)
        attachment = Attachment.objects.create_attachment(filename=filename, data=attach_data, text_version=text_version)
        attach_url = reverse('text-attach', args=[text.key, attachment.key])
        text_content = text_content.replace(filename, attach_url)
            
    # save updated (attach links) text content
    text_version.content = text_content
    text_version.save()
    return text
