from cm.utils.embed import embed_html
from cm.activity import register_activity
from cm.client import jsonize, get_filter_datas, edit_comment, remove_comment, \
    add_comment, RequestComplexEncoder, comments_thread, own_notify
from cm.cm_settings import NEW_TEXT_VERSION_ON_EDIT
from cm.exception import UnauthorizedException
from cm.message import *
from cm.models import *
from django.forms.util import ErrorList
from cm.models_base import generate_key
from cm.security import get_texts_with_perm, has_perm, get_viewable_comments, \
    has_perm_on_text
from cm.utils import get_among, get_among, get_int
from cm.utils.html import on_content_receive
from cm.utils.comment_positioning import compute_new_comment_positions, \
    insert_comment_markers
from cm.utils.spannifier import spannify
from cm.views import get_keys_from_dict, get_textversion_by_keys_or_404, get_text_by_keys_or_404, redirect
from cm.views.export import content_export2, content_export
from cm.views.user import AnonUserRoleForm, cm_login
from difflib import unified_diff
from django import forms
from django.conf import settings
from django.contrib.auth import login as django_login
from django.contrib.auth.forms import AuthenticationForm
from django.contrib.auth.models import User
from django.core.urlresolvers import reverse
from django.db.models import Q
from django.forms import ModelForm
from django.forms.models import BaseModelFormSet, modelformset_factory
from django.http import HttpResponse, HttpResponseRedirect, Http404
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.views.generic.list_detail import object_list
from tagging.models import Tag
import difflib
import logging
import mimetypes
import simplejson
import sys
from django.db.models.sql.datastructures import EmptyResultSet

def get_text_and_admin(key, adminkey, assert_admin = False):
    """
    assert_admin => redirect to unauthorized if not admin 
    """
    admin = False
    if adminkey:
        text = Text.objects.get(key = key, adminkey = adminkey)
        if text:
            admin = True
    else:
        text = Text.objects.get(key=key)
    if assert_admin and not admin:
        raise UnauthorizedException('Is not admin')        
    return text, admin



ACTIVITY_PAGINATION = 10
RECENT_TEXT_NB = 5
RECENT_COMMENT_NB = RECENT_TEXT_NB

MODERATE_NB = 5

def dashboard(request):
    request.session.set_test_cookie()
    if request.user.is_authenticated():
        act_view = {
                    'view_texts' : get_int(request.GET,'view_texts',1),
                    'view_comments' : get_int(request.GET,'view_comments',1),
                    'view_users' : get_int(request.GET,'view_users',1),
                    }
            
        paginate_by = get_int(request.GET,'paginate',ACTIVITY_PAGINATION)
                
        # texts with can_view_unapproved_comment perms
        moderator_texts = get_texts_with_perm(request, 'can_view_unapproved_comment')
        viewer_texts = get_texts_with_perm(request, 'can_view_approved_comment')
        all_texts_ids = [t.id for t in moderator_texts] + [t.id for t in viewer_texts]
                    
        span = get_among(request.GET,'span',('day','month','week',),'week')        
        template_dict = { 
                         'span' : span,
                         'last_texts' : get_texts_with_perm(request, 'can_view_text').order_by('-modified')[:RECENT_TEXT_NB],
                         'last_comments' : Comment.objects.filter(text_version__text__in=all_texts_ids).order_by('-created')[:RECENT_COMMENT_NB],# TODO: useful?
                         #'last_users' : User.objects.all().order_by('-date_joined')[:5],
                         }
        template_dict.update(act_view)
        
        all_activities = {
                               'view_comments' : ['comment_created','comment_removed'],
                               'view_users' : ['user_created', 'user_activated', 'user_suspended','user_enabled',],
                               'view_texts' : ['text_created','text_removed', 'text_edited', 'text_edited_new_version'],
                               }
        
        selected_activities = []
        [selected_activities.extend(all_activities[k]) for k in act_view.keys() if act_view[k]]
        
        activities = Activity.objects.filter(type__in = selected_activities)
        if not has_perm(request,'can_manage_workspace'):
            texts = get_texts_with_perm(request, 'can_view_text')
            activities = activities.filter(Q(text__in=texts))
            
            comments = [] 
            [comments.extend(get_viewable_comments(request, t.last_text_version.comment_set.all(), t)) for t in texts]

            activities = activities.filter(Q(comment__in=comments) | Q(comment=None) )
            template_dict['to_mod_profiles'] = []
        else:
            template_dict['to_mod_profiles'] = UserProfile.objects.filter(user__is_active=False).filter(is_suspended=True).order_by('-user__date_joined')[:MODERATE_NB]
        template_dict['to_mod_comments'] = Comment.objects.filter(state='pending').filter(text_version__text__in=moderator_texts).order_by('-modified')[:MODERATE_NB-len(template_dict['to_mod_profiles'])]

        activities = activities.order_by('-created')
        return object_list(request, activities,
                           template_name = 'site/dashboard.html',
                           paginate_by = paginate_by,
                           extra_context = template_dict,
                           )
        
    else:
        if request.method == 'POST':
            form = AuthenticationForm(request, request.POST)
            if form.is_valid():
                user = form.get_user()
                user.backend = 'django.contrib.auth.backends.ModelBackend'
                cm_login(request, user)            
                display_message(request, _(u"You're logged in!"))
                return HttpResponseRedirect(reverse('index'))
        else:
            form = AuthenticationForm()        


        public_texts = get_texts_with_perm(request, 'can_view_text').order_by('-modified')

        template_dict = {
                         'form' : form,
                         'texts' : public_texts,
                         }
        return render_to_response('site/non_authenticated_index.html', template_dict, context_instance=RequestContext(request))
        
TEXT_PAGINATION = 10
# security check inside view
# TODO: set global access perm
def text_list(request):
    paginate_by = get_int(request.GET,'paginate',TEXT_PAGINATION)
    tag_selected = request.GET.get('tag_selected', 0)
        
    order_by = get_among(request.GET,'order',('title','author','modified','-title','-author','-modified'),'-modified')

    if request.method == 'POST':
        action = request.POST.get('action',None)
        text_keys = get_keys_from_dict(request.POST, 'check-').keys()        
        if action == 'delete':
            for text_key in text_keys:
                text = Text.objects.get(key=text_key)
                if has_perm(request, 'can_delete_text', text=text):
                    text.delete()
                else:
                    raise UnauthorizedException('No perm can_delete_text on comment') 
            display_message(request, _(u'%(nb_texts)i text(s) deleted') %{'nb_texts':len(text_keys)})
            return HttpResponseRedirect(reverse('text'))

    texts = get_texts_with_perm(request, 'can_view_text').order_by(order_by)

    try:
        tag_list = Tag.objects.usage_for_queryset(TextVersion.objects.filter(id__in = [t.last_text_version_id for t in get_texts_with_perm(request, 'can_view_text')]))
    except EmptyResultSet:
        tag_list = []
    context = {    
               'tag_list' : tag_list,
               'tag_selected': tag_selected,
               }

    if tag_selected:     
        tag_ids = Tag.objects.filter(name=tag_selected)
        if tag_ids:   
            content_type_id = ContentType.objects.get_for_model(TextVersion).pk
            # table cm_userprofile is not present if display_suspended_users: fix this 
            texts = texts.extra(where=['tagging_taggeditem.object_id = cm_text.last_text_version_id', 
                                       'tagging_taggeditem.content_type_id = %i' %content_type_id,
                                       'tagging_taggeditem.tag_id = %i' %tag_ids[0].id],
                                tables=['tagging_taggeditem'],
                                )
    
    return object_list(request, texts,
                       template_name = 'site/text_list.html',
                       paginate_by = paginate_by,
                       extra_context=context,
                       )
    
@has_perm_on_text('can_view_text')
def text_view(request, key, adminkey=None):
    text = get_text_by_keys_or_404(key)
    register_activity(request, "text_view", text=text)    
    text_version = text.get_latest_version()
    embed_code = embed_html(key, 'id="text_view_frame" name="text_view_frame"', None, request.META.get('QUERY_STRING'))
    template_dict = { 'embed_code':embed_code, 'text' : text, 'text_version' : text_version, 'title' : text_version.title, 'content' : text_version.get_content()}
    return render_to_response('site/text_view.html', template_dict, context_instance=RequestContext(request))

@has_perm_on_text('can_delete_text')
def text_delete(request, key):
    text = Text.objects.get(key=key)
    if request.method != 'POST':
        raise UnauthorizedException('Unauthorized')
    display_message(request, _(u'Text %(text_title)s deleted') %{'text_title':text.title})
    register_activity(request, "text_removed", text=text)    
    text.delete()
    return HttpResponse('') # no redirect because this is called by js

@has_perm_on_text('can_delete_text')
def text_version_delete(request, key, text_version_key):
    text_version = TextVersion.objects.get(key=text_version_key)
    text=text_version.text
    if request.method != 'POST':
        raise UnauthorizedException('Unauthorized')
    display_message(request, _(u'Text version %(text_version_title)s deleted') %{'text_version_title':text_version.title})
    register_activity(request, "text_version_removed", text=text)
    text_version.delete()
    return HttpResponse('') # no redirect because this is called by js


@has_perm_on_text('can_view_text') # only protected by text_view / comment filtering done in view
def text_view_comments(request, key, version_key=None, adminkey=None):
    text = get_text_by_keys_or_404(key)
    
    read_only = False
    if version_key :
        text_version = get_textversion_by_keys_or_404(version_key, adminkey, key)
        if settings.ALLOW_CLIENT_MODIF_ON_LAST_VERSION_ONLY :
            read_only = (text.last_text_version_id != text_version.id) 
    else :
        text_version = text.get_latest_version()
    
    comments = get_viewable_comments(request, text_version.comment_set.filter(reply_to__isnull=True),text)
    filter_datas = get_filter_datas(request, text_version, text)
    
    get_params = simplejson.dumps(request.GET)
    wrapped_text_version, _ , _ = spannify(text_version.get_content())
    template_dict = {'text' : text,
                               'text_version' : text_version,
                               'title' : text_version.title, # TODO use it ...
                               'get_params' : get_params,
                               'json_comments':jsonize(comments, request),
                               'json_filter_datas':jsonize(filter_datas, request),
                               'content' : wrapped_text_version,
                               'client_date_fmt' : settings.CLIENT_DATE_FMT,
                               'read_only' : read_only,
                               }
    return render_to_response('site/text_view_comments.html',
                              template_dict,
                              context_instance=RequestContext(request))
def client_exchange(request):
    ret = None
    if request.method == 'POST' :
        function_name = request.POST['fun']# function called from client
        user = request.user
        if function_name == 'experiment' :
            ret = experiment()
        elif function_name == 'warn' :
            # TODO: (RBE to RBA) send mail withinfos
            ret = "warn test"
            #print request.POST
        else :
            key = request.POST['key']
            version_key = request.POST['version_key']
    
            text = Text.objects.get(key=key) ;
            #TODO: stupid why restrict to latest ? 
            text_version = text.get_latest_version()
            
            if (text != None) :
                if function_name == 'ownNotify' : 
                    ret = own_notify(request=request, key=key)
                if function_name in ('editComment', 'addComment', 'removeComment',) :
                    if function_name == 'editComment' :
                        ret = edit_comment(request=request, key=key, comment_key=request.POST['comment_key'])
                    elif function_name == 'addComment' :
                        ret = add_comment(request=request, key=key, version_key=version_key)
                    elif function_name == 'removeComment' :
                        ret = remove_comment(request=request, key=key, comment_key=request.POST['comment_key'])
                        
                    ret['filterData'] = get_filter_datas(request, text_version, text)
                    #ret['tagCloud'] = get_tagcloud(key)
    if ret :
        if type(ret) != HttpResponseRedirect and type(ret) != HttpResponse:
            ret = HttpResponse(simplejson.dumps(ret, cls=RequestComplexEncoder, request=request))        
    else :
        ret = HttpResponse()
        ret.status_code = 403 
    return ret 


#NOTE : some arguments like : withcolor = "yes" + format = "markdown" are incompatible
#http://localhost:8000/text/text_key_1/export/pdf/1/all/1
def text_export(request, key, format, download, whichcomments, withcolor, adminkey=None):
    text, admin = get_text_and_admin(key, adminkey)
    text_version = text.get_latest_version()
    original_content = text_version.content
    original_format = text_version.format # BD : html or markdown for  now ...

    download_response = download == "1"
    with_color = withcolor == "1"
    
    comments = [] # whichcomments=="none"
    
    if whichcomments == "filtered" or whichcomments == "all":
        #comments = text_version.comment_set.filter(reply_to__isnull=True)# whichcomments=="all"
        #comments = get_viewable_comments(request, text_version.comment_set.filter(reply_to__isnull=True), text, order_by=('start_wrapper','start_offset','end_wrapper','end_offset'))# whichcomments=="all"
        
        _comments = text_version.comment_set.all()
        if whichcomments == "filtered" :
            filteredIds = []
            if request.method == 'POST' :
                ll = request.POST.get('filteredIds',[]).split(",")
                filteredIds = [ int(l) for l in ll if l]
            _comments = text_version.comment_set.filter(id__in=filteredIds) # security ! TODO CROSS PERMISSIONS WITH POST CONTENT
            
        comments = get_viewable_comments(request, _comments, text, order_by=('start_wrapper','start_offset','end_wrapper','end_offset'))# whichcomments=="all"
        
    # decide to use pandoc or not
    if with_color :
        use_pandoc = False  # pandoc wouldn't preserve comments scope background colors
    else :
        if format in ('markdown', 'latex') : 
            use_pandoc = True
        elif format in ('pdf', 'odt') : 
            use_pandoc = (original_format == "markdown")
        elif format in ('doc', 'html') : 
            use_pandoc = False
    if len(comments) == 0 : #want to bypass html conversion in this case
        return content_export2(request, original_content, text_version.title, original_format, format, use_pandoc, download_response)
    else : # case comments to be added  
        #comments = comments.order_by('start_wrapper','start_offset','end_wrapper','end_offset')
        html = text_version.get_content()
        wrapped_text_version, _ , _ = spannify(html)
        with_markers = True
        marked_content = insert_comment_markers(wrapped_text_version, comments, with_markers, with_color)
    
        viewable_comments = comments_thread(request, text_version, text) 
    #        viewable_commentsnoreply = get_viewable_comments(request, commentsnoreply, text, order_by = ('start_wrapper','start_offset','end_wrapper','end_offset'))
    #        viewable_comments = []
    #        for cc in viewable_commentsnoreply :
    #            viewable_comments += list_viewable_comments(request, [cc], text)
            
        # numerotation{  id --> numbered as a child}
        extended_comments = {}
        nb_children = {}
        for cc in viewable_comments :
            id = 0 #<-- all top comments are children of comment with id 0
            if cc.is_reply() :
                id = cc.reply_to_id
                
            nb_children[id] = nb_children.get(id, 0) + 1
            
            cc.num = "%d"%nb_children[id]
            
            extended_comments[cc.id] = cc
        
            if cc.is_reply() :
                cc.num = "%s.%s"%(extended_comments[cc.reply_to_id].num, cc.num)
        
    #        viewable_comments += list_viewable_comments(request, viewable_commentsnoreply, text)
        html_comments=render_to_string('site/macros/text_comments.html',{'comments':viewable_comments }, context_instance=RequestContext(request))
        
        content = "%s%s"%(marked_content, html_comments)
        content_format = "html" 
        # impossible to satisfy because of color then no colors instead:
        if with_color and format in ('markdown', 'tex') : #TODO : add S5
            with_color = False  
        
        return content_export2(request, content, text_version.title, content_format, format, use_pandoc, download_response)

def text_print(request, key, adminkey=None):
    text, admin = get_text_and_admin(key, adminkey)
    
    text_version = text.get_latest_version()

#    chosen default url behaviour is export all comments + bckcolor + pdf  
    comments = Comment.objects.filter(text_version=text_version, reply_to__isnull=True)

    with_markers = True
    with_colors = True 
    download_requested = True   
    action = 'export' # client origine dialog
    requested_format = 'pdf' # requested output format

    if request.method == 'POST':
        # colors or not ?
        with_colors = (u'yes' == request.POST.get('p_color', u'no'))

        # restrict comments to ones that should be exported / printed          
        p_comments = request.POST.get('p_comments')
        if p_comments == "filtered" or p_comments == "none" : 
            filteredIds = [] # "none" case  
            if p_comments == "filtered" : 
                ll = request.POST.get('filteredIds').split(",")
                filteredIds = [ int(l) for l in ll if l]
  
            comments = comments.filter(id__in=filteredIds)

        # print or export ?
        action = request.POST.get('print_export_action')
        requested_format = request.POST.get('p_method')

    comments = comments.order_by('start_wrapper','start_offset','end_wrapper','end_offset')

    download_requested = (action == 'export') or (action == 'print' and requested_format != 'html')   

    ori_format = text_version.format # BD : html or markdown for  now ...
    src_format = ori_format # as expected by convert functions ...
    src = text_version.content
    
    if len(comments) > 0 and (with_markers or with_colors) :
        html = text_version.get_content()
        wrapped_text_version, _ , _ = spannify(html)
        marked_text_version = insert_comment_markers(wrapped_text_version, comments, with_markers, with_colors)

        src_format = 'html'
        src = marked_text_version
        html_comments=render_to_string('site/macros/text_comments.html',{'comments':comments}, context_instance=RequestContext(request))
        src += html_comments
        
    if download_requested :
        use_pandoc = (requested_format == 'html' or requested_format == 'markdown')
        return content_export(request, src, text_version.title, src_format, requested_format, use_pandoc)
    else : # action == 'print' and requested_format == 'html' (no colors)
        template_dict = {'text' : text,
                       'text_version' : text_version,
                       'title' : text_version.title, # TODO use it ...
                       'comments': comments,
                       'content' : marked_text_version,
                       'client_date_fmt' : settings.CLIENT_DATE_FMT
                       }
        if admin:
             template_dict['adminkey'] = text.adminkey   
             template_dict['admin'] = True       
        return render_to_response('site/text_print.html',
                                  template_dict,
                                  context_instance=RequestContext(request))

@has_perm_on_text('can_view_text')
def text_view_frame(request, key, version_key=None, adminkey=None):
    text = get_text_by_keys_or_404(key)
    
    if version_key :
        text_version = get_textversion_by_keys_or_404(version_key, adminkey, key)
    else :
        text_version = text.get_latest_version()
    template_dict = {'text' : text, 'text_version' : text_version}
    return render_to_response('site/text_view_frame.html',
                              template_dict,
                              context_instance=RequestContext(request))


@has_perm_on_text('can_view_text')
def text_history_version(request, key, version_key):
    text = get_text_by_keys_or_404(key)
    text_version = get_textversion_by_keys_or_404(version_key, key=key)
    template_dict = {'text' : text,
                     'text_version' : text_version,
                     'embed_code' : embed_html(key, 'id="text_view_frame" name="text_view_frame"', version_key),
                      }
    return render_to_response('site/text_history_version.html',
                              template_dict,
                              context_instance=RequestContext(request))

@has_perm_on_text('can_view_text')
def text_history_compare(request, key, v1_version_key, v2_version_key, mode=''):
    text = get_text_by_keys_or_404(key)
    v1 = get_textversion_by_keys_or_404(v1_version_key, key=key)
    v2 = get_textversion_by_keys_or_404(v2_version_key, key=key)

    content = get_uniffied_inner_diff_table(v1.title,
                                            v2.title, 
                                            _("by %(author)s") %{'author' : v1.get_name()},
                                            _("by %(author)s") %{'author' : v2.get_name()},
                                            v1.content,
                                            v2.content)
    if mode=='1':
        # alternate diff
        from cm.utils.diff import text_diff
        content = text_diff(v1.get_content(), v2.get_content())

    template_dict = {
                     'text' : text,
                     'v1': v1,
                     'v2': v2,
                     'content' : content.strip(),
                     'empty' : '<table class="diff"><tbody></tbody></table>'==content,
                     }
    return render_to_response('site/text_history_compare.html',
                              template_dict,
                              context_instance=RequestContext(request))
    
@has_perm_on_text('can_view_text')
def text_history(request, key):
    text = get_text_by_keys_or_404(key)
    
    if request.method == 'POST':
        v1_key = request.POST.get('newkey',None)
        v2_key = request.POST.get('oldkey',None)
        if v1_key and v2_key:  
            return redirect(request, 'text-history-compare', args=[text.key, v2_key, v1_key ])
        
    text_versions = text.get_versions()
    paginate_by = get_int(request.GET,'paginate',TEXT_PAGINATION)

    last_last_version = text_versions[1] if len(text_versions)>1 else None 
    context = {'text':text, 'last_version':text.last_text_version, 'last_last_version':last_last_version}
    return object_list(request, text_versions,
                       template_name = 'site/text_history.html',
                       paginate_by = paginate_by,
                       extra_context=context,
                       )
    

# taken from trac
def _get_change_extent(str1, str2):
    """
    Determines the extent of differences between two strings. Returns a tuple
    containing the offset at which the changes start, and the negative offset
    at which the changes end. If the two strings have neither a common prefix
    nor a common suffix, (0, 0) is returned.
    """
    start = 0
    limit = min(len(str1), len(str2))
    while start < limit and str1[start] == str2[start]:
        start += 1
    end = -1
    limit = limit - start
    while - end <= limit and str1[end] == str2[end]:
        end -= 1
    return (start, end + 1)

def diff_decorate(minus, plus):
    return minus, plus

def get_uniffied_inner_diff_table(title1, title2, author1, author2, text1, text2):
    """
    Return the inner of the html table for text1 vs text2 diff
    """
    gen = unified_diff(text1.split('\n'), text2.split('\n'), n=3)
    index = 0
    res = ['<table class="diff"><tbody>']
    res.append('<tr><td></td><td class="diff-title">%s</td><td></td><td></td><td class="diff-title">%s</td></tr>' %(title1, title2))
    res.append('<tr><td></td><td class="diff-author">%s</td><td></td><td></td><td class="diff-author">%s</td></tr>' %(author1, author2))
    res.append('<tr><td colspan="5"></td></tr>')
    #res.append('<tr><td width="50%" colspan="2"></td><td width="50%" colspan="2"></td></tr>')
    
    for g in gen:
        if index > 1:
            col_in = None
            if g.startswith('@@'):
                line_number = g.split(' ')[1][1:].split(',')[0]
                if index != 2:
                    res.append('<tr><td></td>&nbsp;<td></td><td></td><td>&nbsp;</td></tr>')                    
                res.append('<tr><td class="diff-lineno" colspan="2">Line %s</td><td class="diff-separator"></td><td class="diff-lineno" colspan="2">Line %s</td></tr>' % (line_number, line_number))
            if g.startswith(' '):
                res.append('<tr><td class="diff-marker"></td><td class="diff-context">%s</td><td class="diff-separator"></td><td class="diff-marker"></td><td class="diff-context">%s</td></tr>' % (g, g))
            if g.startswith('-') or g.startswith('+'):
                plus = []
                minus = []
                while g.startswith('-') or g.startswith('+'):
                    if g.startswith('-'):
                        minus.append(g[1:])
                    else:
                        plus.append(g[1:])
                    try:
                        g = gen.next()
                    except StopIteration:
                        break
                minus, plus = diff_decorate(minus, plus)
                res.append('<tr><td class="diff-marker">-</td><td class="diff-deletedline">%s</td><td class="diff-separator"></td><td class="diff-marker">+</td><td class="diff-addedline">%s</td></tr>' % ('<br />'.join(minus), '<br />'.join(plus)))
             
        index += 1
    res.append('</tbody></table>')
    return ''.join(res)

#def text_history_version(request, key):
#    text = get_text_by_keys_or_404(key=key)
#    return _text_history_version(request, text)
#
#def text_history_version_admin(request, key, adminkey):
#    text = get_text_by_keys_or_404(key=key, adminkey=adminkey)
#    return _text_history_version(request, text, True)
#    if admin:
#         template_dict['adminkey'] = text.adminkey
#         template_dict['admin'] = True          
#    return render_to_response('site/text_history.html', template_dict, context_instance=RequestContext(request))
#
class TextVersionForm(ModelForm):
    class Meta:
        model = TextVersion
        fields = ('title', 'content', 'format')

class EditTextForm(ModelForm):
    title = forms.CharField(label=_("Title"), widget=forms.TextInput)
    #format = forms.CharField(label=_("Format"))
    #content = forms.TextField(label=_("Content"))

    note = forms.CharField(label=_("Note (optional)"),
                           widget=forms.TextInput,
                           required=False,
                           help_text=_("Add a note to explain the modifications made to the text")
                           )

    #tags = forms.CharField(label=_("Tags (optional)"),
    #                       widget=forms.TextInput,
    #                       required=False,
    #                       #help_text=_("Add a note to explain the modifications made to the text")
    #                       )


    new_version = forms.BooleanField(label=_("New version (optional)"),
                           required=False,
                           initial=True,
                           help_text=_("Create a new version of this text (recommended)")
                           )

    keep_comments = forms.BooleanField(label=_("Keep comments (optional)"),
                           required=False,
                           initial=True,
                           help_text=_("Keep comments (if not affected by the edit)")
                           )
    
    class Meta:
        model = TextVersion
        fields = ('title', 'format', 'content', 'new_version', 'tags', 'note')
        
    def save_into_text(self, text, request):
        new_content = request.POST.get('content')
        new_title = request.POST.get('title')
        new_format = request.POST.get('format', text.last_text_version.format)
        new_note = request.POST.get('note',None)
        new_tags = request.POST.get('tags',None)
        cancel_modified_scopes = (request.POST.get('cancel_modified_scopes',u'1') == u'1')
        version = text.get_latest_version()
        version.edit(new_title, new_format, new_content, new_tags, new_note, True, cancel_modified_scopes)

        return version

    def save_new_version(self, text, request):
        new_content = request.POST.get('content')
        new_title = request.POST.get('title')
        new_format = request.POST.get('format', text.last_text_version.format)        
        new_note = request.POST.get('note',None)
        new_tags = request.POST.get('tags',None)
        cancel_modified_scopes = (request.POST.get('cancel_modified_scopes',u'1') == u'1')
        
        new_text_version = text.edit(new_title, new_format, new_content, new_tags, new_note, keep_comments=True, cancel_modified_scopes=cancel_modified_scopes, new_version=True)
        
        new_text_version.edit(new_title, new_format, new_content, new_tags, new_note, True, cancel_modified_scopes)
        new_text_version.user = request.user if request.user.is_authenticated() else None
        new_text_version.note = request.POST.get('note','')
        new_text_version.email = request.POST.get('email','')
        new_text_version.name = request.POST.get('name','')
        new_text_version.save()
        
        return new_text_version

    def __init__(self, data=None, files=None, auto_id='id_%s', prefix=None,
                 initial=None, error_class=ErrorList, label_suffix=':',
                 empty_permitted=False, instance=None):
        ModelForm.__init__(self, data, files, auto_id, prefix, initial, error_class, label_suffix, empty_permitted, instance)

        # override manually to disabled
        format_field = self.fields['format']
        format_field.widget.attrs = attrs={'disabled':'disabled'}
        format_field.required = False

        self.fields['format'] = format_field

@has_perm_on_text('can_edit_text')
def text_pre_edit(request, key, adminkey=None):
    text = get_text_by_keys_or_404(key)
    
    text_version = text.get_latest_version()
    comments = text_version.get_comments() ;
    new_format = request.POST['new_format']
    new_content = on_content_receive(request.POST['new_content'], new_format)

    # TODO: RBE : si commentaire mal forme : (position non existante : boom par key error)
    _tomodify_comments, toremove_comments = compute_new_comment_positions(text_version.content, text_version.format, new_content, new_format, comments)
    return HttpResponse(simplejson.dumps({'nb_removed' : len(toremove_comments) }))

class EditTextFormAnon(EditTextForm):
    name = forms.CharField(label=ugettext_lazy("Name (optional)"), widget=forms.TextInput, required=False)
    email = forms.EmailField(label=ugettext_lazy("Email (optional)"), required=False)
    content = forms.CharField(label=ugettext_lazy("Content"), required=True, widget=forms.Textarea(attrs={'rows':'30', 'cols': '70'}))
    
    class Meta:
        model = TextVersion
        fields = ('title', 'format', 'content', 'tags', 'note', 'name', 'email')

@has_perm_on_text('can_edit_text')
def text_edit(request, key, adminkey=None):
    text = get_text_by_keys_or_404(key)
    text_version = text.get_latest_version()
    if request.method == 'POST':
        if request.user.is_authenticated():
            form = EditTextForm(request.POST)
        else:
            form = EditTextFormAnon(request.POST)

        if form.is_valid():
            if request.POST.get('new_version'):
                new_version = form.save_new_version(text, request)
                register_activity(request, "text_edited_new_version", text=text, text_version=new_version)
            else:
                form.save_into_text(text, request)
                register_activity(request, "text_edited", text=text)    
            return redirect(request, 'text-view', args=[text.key]) 
    else:
        default_data = {
                        'content': text_version.content,
                        'title': text_version.title,
                        'format': text_version.format,
                        'tags': text_version.tags,
                        'new_version': NEW_TEXT_VERSION_ON_EDIT,
                        'note' : text_version.note,
                        'keep_comments' : True,
                       }        
        if request.user.is_authenticated():
            form = EditTextForm(default_data)
        else:
            form = EditTextFormAnon(default_data)

    template_dict = {'text' : text, 'form' : form}

    return render_to_response('site/text_edit.html', template_dict , context_instance=RequestContext(request))

@has_perm_on_text('can_edit_text')
def text_revert(request, key, text_version_key):
    if request.method != 'POST':
        raise UnauthorizedException('Unauthorized')
        
    text = get_text_by_keys_or_404(key)

    text_version = text.revert_to_version(text_version_key)
    display_message(request, _(u'A new version (copied from version %(version_title)s) has been created') % {'version_title':text_version.title})

    return HttpResponse('') # no redirect because this is called by js
    
@has_perm_on_text('can_view_text')
def text_attach(request, key, attach_key):
    attach = Attachment.objects.get(key=attach_key, text_version__text__key=key)
    content = file(attach.data.path).read()
    mimetype, _encoding = mimetypes.guess_type(attach.data.path)
    response = HttpResponse(content, mimetype)
    return response

    


def fix_anon_in_formset(formset):
    # fix role choice in formset for anon (not all role are allowed)
    role_field = [f.fields['role'] for f in formset.forms if f.instance.user == None][0]
    role_field.choices = [(u'', u'---------')] + [(r.id, str(r)) for r in Role.objects.filter(anon = True)] # limit anon choices

class BaseUserRoleFormSet(BaseModelFormSet):
    def clean(self):
        """Checks that anon users are given roles with anon=True."""
        for i in range(0, self.total_form_count()):
            form = self.forms[i]
            print form.cleaned_data
            user_role = form.cleaned_data['id']
            if user_role.user == None:
                role = form.cleaned_data['role']
                if not role.anon:
                    # nasty stuff: cannot happen so not dealt with in tempate
                    logging.warn('Cannot give such role to anon user.')
                    raise forms.ValidationError, "Cannot give such role to anon user."

#@has_perm_on_text('can_manage_text')
#def xtext_share(request, key):
#    text = get_text_by_keys_or_404(key)
#    order_by = get_among(request.GET,'order',('user__username','-user__username','role__name','-role__name'),'user__username')
#        
#    UserRole.objects.create_userroles_text(text)
#    UserRoleFormSet = modelformset_factory(UserRole, fields=('role', ), extra=0, formset = BaseUserRoleFormSet)
#    
#    # put anon users on top no matter what the order says (TODO: ?)
#    userrole_queryset = UserRole.objects.filter(text=text).extra(select={'anon':'"cm_userrole"."user_id">-1'}).order_by('-anon',order_by)
#    if request.method == 'POST':
#        formset = UserRoleFormSet(request.POST, queryset = userrole_queryset)
#
#        if formset.is_valid():
#            formset.save()
#            display_message(request, "Sharing updated.")
#            return HttpResponseRedirect(reverse('text-share',args=[text.key]))
#
#    else:
#        formset = UserRoleFormSet(queryset = userrole_queryset)
#        fix_anon_in_formset(formset)
#         
#    global_anon_userrole = UserRole.objects.get(text=None, user=None)
#    return render_to_response('site/text_share.html', {'text' : text, 
#                                                       'formset' : formset,
#                                                       'global_anon_userrole' : global_anon_userrole,
#                                                       } , context_instance=RequestContext(request))

# TODO: permission protection ? format value check ?
def text_wysiwyg_preview(request, format):
    html_content = ""
    if request.POST : # if satisfied in the no html case, in html case : no POST (cf. markitup) previewTemplatePath and previewParserPath
        html_content = pandoc_convert(request.POST['data'], format, "html", full=False)
        
    return render_to_response('site/wysiwyg_preview.html', {'content':html_content} , context_instance=RequestContext(request))
        #return HttpResponse(pandoc_convert(content, format, "html", full=False))

USER_PAGINATION = 10

@has_perm_on_text('can_manage_text')
def text_share(request, key):
    display_suspended_users = get_int(request.GET, 'display', 0)
    tag_selected = request.GET.get('tag_selected', 0)
    paginate_by = get_int(request.GET, 'paginate', USER_PAGINATION)    
    
    text = get_text_by_keys_or_404(key)
    order_by = get_among(request.GET,'order',('user__username',
                                              'user__email',
                                              '-user__username',
                                              '-user__email',
                                              'role__name',
                                              '-role__name',
                                              ),
                          'user__username')
    
    UserRole.objects.create_userroles_text(text)
    
    if request.method == 'POST':
        if 'save' in request.POST:
            user_profile_keys_roles = get_keys_from_dict(request.POST, 'user-role-')
            count = 0
            for user_profile_key in user_profile_keys_roles:
                role_id = user_profile_keys_roles[user_profile_key]
                if not user_profile_key:
                    user_role = UserRole.objects.get(user = None, text = text)
                else:                    
                    user_role = UserRole.objects.get(user__userprofile__key = user_profile_key, text = text)
                if (role_id != u'' or user_role.role_id!=None) and role_id!=unicode(user_role.role_id):
                    if role_id:
                        user_role.role_id = int(role_id)
                    else:
                        user_role.role_id = None
                    user_role.save()
                    count += 1
            display_message(request, _(u'%(count)i user(s) role modified') %{'count':count})                
            return HttpResponseRedirect(reverse('text-share', args=[text.key]))    
    
    anon_role = UserRole.objects.get(user = None, text = text).role
    global_anon_role = UserRole.objects.get(user = None, text = None).role
        
    context = {
               'anon_role' : anon_role,
               'global_anon_role' : global_anon_role,
               'all_roles' : Role.objects.all(),
               'anon_roles' : Role.objects.filter(anon = True),
               'text' : text,
               'display_suspended_users' : display_suspended_users,
               'tag_list' : Tag.objects.usage_for_model(UserProfile),
               'tag_selected': tag_selected,               
               }

    query = UserRole.objects.filter(text=text).filter(~Q(user=None)).order_by(order_by)
    if not display_suspended_users:
        query = query.exclude(Q(user__userprofile__is_suspended=True) & Q(user__is_active=True))
    else:
        # trick to include userprofile table anyway (to filter by tags)
        query = query.filter(Q(user__userprofile__is_suspended=True) | Q(user__userprofile__is_suspended=False))

    if tag_selected:     
        tag_ids = Tag.objects.filter(name=tag_selected)
        if tag_ids:   
            content_type_id = ContentType.objects.get_for_model(UserProfile).pk
            query = query.extra(where=['tagging_taggeditem.object_id = cm_userprofile.id', 
                                       'tagging_taggeditem.content_type_id = %i' %content_type_id,
                                       'tagging_taggeditem.tag_id = %i' %tag_ids[0].id],
                                tables=['tagging_taggeditem'],
                                )

    return object_list(request, query,
                       template_name = 'site/text_share.html',
                       paginate_by = paginate_by,
                       extra_context = context,
                       )
    
    
class SettingsTextForm(ModelForm):
    # example name = forms.CharField(label=_("Name (optional)"), widget=forms.TextInput, required=False)
    
    class Meta:
        model = TextVersion
        fields = ('mod_posteriori',)

@has_perm_on_text('can_manage_text')
def text_settings(request, key):
    text = get_text_by_keys_or_404(key)
        
    text_version = text.get_latest_version()
    if request.method == 'POST':
        form = SettingsTextForm(request.POST, instance = text_version)
        
        if form.is_valid():
            form.save()
            display_message(request, _(u'Text settings updated'))                            
            return redirect(request, 'text-view', args=[text.key])
    else:
        form = SettingsTextForm(instance = text_version)

    template_dict = {'text' : text, 'form' : form}

    return render_to_response('site/text_settings.html', template_dict , context_instance=RequestContext(request))

