#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
    openslides.assignment.views
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~

    Views for the assignment app.

    :copyright: 2011 by the OpenSlides team, see AUTHORS.
    :license: GNU GPL, see LICENSE for more details.
"""

from django.shortcuts import redirect
from django.core.urlresolvers import reverse
from django.contrib import messages
from django.contrib.auth.decorators import login_required
from django.utils.translation import ugettext as _

from reportlab.lib import colors
from reportlab.lib.units import cm
from reportlab.platypus import PageBreak, Paragraph, Spacer, Table, TableStyle

from config.models import config

from utils.utils import template, permission_required, gen_confirm_form, del_confirm_form, ajax_request
from utils.pdf import print_assignment_poll
from utils.pdf import stylesheet
from utils.views import FormView, DeleteView, PDFView
from utils.template import Tab

from poll.views import PollFormView

from assignment.models import Assignment, AssignmentPoll, AssignmentOption
from assignment.forms import AssignmentForm, AssignmentRunForm, ConfigForm

from participant.models import Profile


@permission_required('assignment.can_see_assignment')
@template('assignment/overview.html')
def get_overview(request):
    query = Assignment.objects
    if 'status' in request.GET and '---' not in request.GET['status']:
        query = query.filter(status__iexact=request.GET['status'])
    try:
        sort = request.GET['sort']
        if sort in ['name','status']:
            query = query.order_by(sort)
    except KeyError:
        query = query.order_by('name')
    if 'reverse' in request.GET:
        query = query.reverse()

    assignments = query.all()
    return {
        'assignments': assignments,
    }


@permission_required('assignment.can_see_assignment')
@template('assignment/view.html')
def view(request, assignment_id=None):
    form = None
    assignment = Assignment.objects.get(pk=assignment_id)
    if request.method == 'POST':
        if request.user.has_perm('assignment.can_nominate_other'):
            form = AssignmentRunForm(request.POST)
            if form.is_valid():
                user = form.cleaned_data['candidate']
                try:
                    assignment.run(user)
                    messages.success(request, _("Candidate <b>%s</b> was nominated successfully.") % (user))
                except NameError, e:
                    messages.error(request, e)
    else:
        if request.user.has_perm('assignment.can_nominate_other'):
            form = AssignmentRunForm()

    votes = []
    for candidate in assignment.candidates:
        tmplist = [[candidate, assignment.is_elected(candidate)], []]
        for poll in assignment.poll_set.all():
            if (poll.published and not request.user.has_perm('assignment.can_manage_assignment')) or request.user.has_perm('assignment.can_manage_assignment'):
            	# candidate exists in poll
            	if poll.get_options().filter(candidate=candidate).exists():
                    option = AssignmentOption.objects.filter(poll=poll).get(candidate=candidate)
                    try:
                        tmplist[1].append(option.get_votes()[0])
                    except IndexError:
                        tmplist[1].append('–')
                else:
                    tmplist[1].append("-")
            votes.append(tmplist)

    polls = assignment.poll_set.all()

    return {
        'assignment': assignment,
        'form': form,
        'votes': votes,
        'polls': polls,
    }


@permission_required('assignment.can_manage_assignment')
@template('assignment/edit.html')
def edit(request, assignment_id=None):
    """
    View zum editieren und neuanlegen von Wahlen
    """
    if assignment_id is not None:
        assignment = Assignment.objects.get(id=assignment_id)
    else:
        assignment = None

    if request.method == 'POST':
        form = AssignmentForm(request.POST, instance=assignment)
        if form.is_valid():
            assignment = form.save()
            if assignment_id is None:
                messages.success(request, _('New election was successfully created.'))
            else:
                messages.success(request, _('Election was successfully modified.'))
            if not 'apply' in request.POST:
                return redirect(reverse("assignment_overview"))
            if assignment_id is None:
                return redirect(reverse('assignment_edit', args=[assignment.id]))
        else:
            messages.error(request, _('Please check the form for errors.'))
    else:
        form = AssignmentForm(instance=assignment)
    return {
        'form': form,
        'assignment': assignment,
    }


@permission_required('assignment.can_manage_assignment')
def delete(request, assignment_id):
    assignment = Assignment.objects.get(pk=assignment_id)
    if request.method == 'POST':
        assignment.delete()
        messages.success(request, _('Election <b>%s</b> was successfully deleted.') % assignment)
    else:
        del_confirm_form(request, assignment)
    return redirect(reverse('assignment_overview'))


@permission_required('assignment.can_manage_assignment')
@template('assignment/view.html')
def set_status(request, assignment_id=None, status=None):
    try:
        if status is not None:
            assignment = Assignment.objects.get(pk=assignment_id)
            assignment.set_status(status)
            messages.success(request, _('Election status was set to: <b>%s</b>.') % assignment.get_status_display())
    except Assignment.DoesNotExist:
        pass
    return redirect(reverse('assignment_view', args=[assignment_id]))


@permission_required('assignment.can_nominate_self')
def run(request, assignment_id):
    assignment = Assignment.objects.get(pk=assignment_id)
    try:
        assignment.run(request.user.profile)
        messages.success(request, _('You have set your candidature successfully.') )
    except NameError, e:
        messages.error(request, e)
    except Profile.DoesNotExist:
        messages.error(request,
                       _("You can't candidate. Your user account is only for administration."))
    return redirect(reverse('assignment_view', args=assignment_id))


@login_required
def delrun(request, assignment_id):
    assignment = Assignment.objects.get(pk=assignment_id)
    assignment.delrun(request.user.profile)
    messages.success(request, _("You have withdrawn your candidature successfully.") )
    return redirect(reverse('assignment_view', args=assignment_id))


@permission_required('assignment.can_manage_assignment')
def delother(request, assignment_id, profile_id):
    assignment = Assignment.objects.get(pk=assignment_id)
    profile = Profile.objects.get(pk=profile_id)

    if request.method == 'POST':
        assignment.delrun(profile)
        messages.success(request, _("Candidate <b>%s</b> was withdrawn successfully.") % (profile))
    else:
        gen_confirm_form(request,
                       _("Do you really want to withdraw <b>%s</b> from the election?") \
                        % profile, reverse('assignment_delother', args=[assignment_id, profile_id]))
    return redirect(reverse('assignment_view', args=assignment_id))


@permission_required('assignment.can_manage_application')
def set_active(request, assignment_id):
    assignment = Assignment.objects.get(pk=assignment_id)
    assignment.set_active()
    return redirect(reverse('assignment_view', args=[assignment_id]))


@permission_required('assignment.can_manage_assignment')
def gen_poll(request, assignment_id):
    poll = Assignment.objects.get(pk=assignment_id).gen_poll()
    messages.success(request, _("New ballot was successfully created.") )
    return redirect(reverse('assignment_poll_view', args=[poll.id]))


class ViewPoll(PollFormView):
    poll_class = AssignmentPoll
    template_name = 'assignment/poll_view.html'

    def get_context_data(self, **kwargs):
        context = super(ViewPoll, self).get_context_data(**kwargs)
        self.assignment = self.poll.get_assignment()
        context['application'] = self.assignment
        return context

    def get_success_url(self):
        if not 'apply' in self.request.POST:
            return reverse('assignment_view', args=[self.poll.assignment.id])
        return ''


@permission_required('assignment.can_manage_assignment')
def set_published(request, poll_id, published=True):
    try:
        poll = AssignmentPoll.objects.get(pk=poll_id)
        poll.set_published(published)
        if poll.published:
            messages.success(request, _("Poll successfully set to published.") )
        else:
            messages.success(request, _("Poll successfully set to unpublished.") )
    except AssignmentPoll.DoesNotExist:
        messages.error(request, _('Poll ID %d does not exist.') % int(poll_id))
    return redirect(reverse('assignment_view', args=[poll.assignment.id]))



@permission_required('assignment.can_manage_assignment')
def set_elected(request, assignment_id, profile_id, elected=True):
    assignment = Assignment.objects.get(pk=assignment_id)
    profile = Profile.objects.get(pk=profile_id)
    assignment.set_elected(profile, elected)

    if request.is_ajax():
        if elected:
            link = reverse('assignment_user_not_elected', args=[assignment.id, profile.id])
            text = _('not elected')
        else:
            link = reverse('assignment_user_elected', args=[assignment.id, profile.id])
            text = _('elected')
        return ajax_request({'elected': elected,
                             'link': link,
                             'text': text})

    return redirect(reverse('assignment_view', args=[assignment_id]))


class AssignmentPollDelete(DeleteView):
    """
    Delete an assignment poll object.
    """
    permission_required = 'assignment.can_manage_assignment'
    model = AssignmentPoll

    def pre_redirect(self, request, *args, **kwargs):
        self.set_assignment()
        super(AssignmentPollDelete, self).pre_redirect(request, *args, **kwargs)

    def pre_post_redirect(self, request, *args, **kwargs):
        self.set_assignment()
        super(AssignmentPollDelete, self).pre_post_redirect(request, *args, **kwargs)

    def set_assignment(self):
        self.assignment = self.object.assignment

    def get_redirect_url(self, **kwargs):
        return reverse('assignment_view', args=[self.assignment.id])


class AssignmentPDF(PDFView):
    permission_required = 'assignment.can_manage_assignment'
    filename = u'filename=%s.pdf;' % _("Elections")
    top_space = 0

    def append_to_pdf(self, story):
        try:
            assignment_id = self.kwargs['assignment_id']
        except KeyError:
            assignment_id = None
        if assignment_id is None:  #print all applications
            title = config["assignment_pdf_title"]
            story.append(Paragraph(title, stylesheet['Heading1']))
            preamble = config["assignment_pdf_preamble"]
            if preamble:
                story.append(Paragraph("%s" % preamble.replace('\r\n','<br/>'), stylesheet['Paragraph']))
            story.append(Spacer(0,0.75*cm))
            # List of assignments
            for assignment in Assignment.objects.order_by('name'):
                story.append(Paragraph(assignment.name, stylesheet['Heading3']))
            # Assignment details (each assignment on single page)
            for assignment in Assignment.objects.order_by('name'):
                story.append(PageBreak())
                story = self.get_assignment(assignment, story)
        else:  # print selected assignment
            assignment = Assignment.objects.get(id=assignment_id)
            filename = u'filename=%s-%s.pdf;' % (_("Assignment"), assignment.name.replace(' ','_'))
            story = self.get_assignment(assignment, story)

    def get_assignment(self, assignment, story):
        # title
        story.append(Paragraph(_("Election")+": %s" % assignment.name, stylesheet['Heading1']))
        story.append(Spacer(0,0.5*cm))
        # posts
        cell1a = []
        cell1a.append(Paragraph("<font name='Ubuntu-Bold'>%s:</font>" % _("Number of available posts"), stylesheet['Bold']))
        cell1b = []
        cell1b.append(Paragraph(str(assignment.posts), stylesheet['Paragraph']))
        # candidates
        cell2a = []
        cell2a.append(Paragraph("<font name='Ubuntu-Bold'>%s:</font><seqreset id='counter'>" % _("Candidates"), stylesheet['Heading4']))
        cell2b = []
        for c in assignment.profile.all():
            cell2b.append(Paragraph("<seq id='counter'/>.&nbsp; %s" % unicode(c), stylesheet['Signaturefield']))
        if assignment.status == "sea":
            for x in range(0,2*assignment.posts):
                cell2b.append(Paragraph("<seq id='counter'/>.&nbsp; __________________________________________",stylesheet['Signaturefield']))
        cell2b.append(Spacer(0,0.2*cm))
        # vote results
        table_votes = []
        results = self.get_assignment_votes(assignment)
        cell3a = []
        cell3a.append(Paragraph("%s:" % (_("Vote results")), stylesheet['Heading4']))
        if len(results) > 0:
            if len(results[0]) >= 1:
                cell3a.append(Paragraph("%s %s" % (len(results[0][1]), _("ballots")), stylesheet['Normal']))
            if len(results[0][1]) > 0:
                data_votes = []
                # add table head row
                headrow = []
                headrow.append(_("Candidates"))
                for i in range (0,len(results[0][1])):
                    headrow.append("%s." %(str(i+1)))
                data_votes.append(headrow)
                # add result rows
                for candidate in results:
                    row = []
                    if candidate[0][1]:
                        elected = "* "
                    else:
                        elected = ""
                    c = str(candidate[0][0]).split("(",1)
                    if len(c) > 1:
                        row.append(elected+c[0]+"\n"+"("+c[1])
                    else:
                        row.append(elected+str(candidate[0][0]))
                    for votes in candidate[1]:
                        if type(votes) == type(list()):
                            tmp = _("Y")+": "+str(votes[0])+"\n"
                            tmp += _("N")+": "+str(votes[1])+"\n"
                            tmp += _("A")+": "+str(votes[2])
                            row.append(tmp)
                        else:
                            row.append(str(votes))

                    data_votes.append(row)
                polls = []
                for poll in assignment.poll_set.filter(assignment=assignment):
                    polls.append(poll)
                # votes invalid
                row = []
                row.append(_("Invalid votes"))
                for p in polls:
                    if p.published:
                        row.append(p.votesinvalid)
                data_votes.append(row)

                # votes cast
                row = []
                row.append(_("Votes cast"))
                for p in polls:
                    if p.published:
                        row.append(p.votescast)
                data_votes.append(row)

                table_votes=Table(data_votes)
                table_votes.setStyle( TableStyle([
                                ('GRID', (0,0), (-1,-1), 0.5, colors.grey),
                                ('VALIGN',(0,0),(-1,-1), 'TOP'),
                                ('LINEABOVE',(0,0),(-1,0),2,colors.black),
                                ('LINEABOVE',(0,1),(-1,1),1,colors.black),
                                ('LINEBELOW',(0,-1),(-1,-1),2,colors.black),
                                ('ROWBACKGROUNDS', (0, 1), (-1, -1), (colors.white, (.9, .9, .9))),
                                  ]))

        # table
        data = []
        data.append([cell1a,cell1b])
        if table_votes:
            data.append([cell3a,table_votes])
            data.append(['','* = '+_('elected')])
        else:
            data.append([cell2a,cell2b])
        data.append([Spacer(0,0.2*cm),''])
        t=Table(data)
        t._argW[0]=4.5*cm
        t._argW[1]=11*cm
        t.setStyle(TableStyle([ ('BOX', (0,0), (-1,-1), 1, colors.black),
                                ('VALIGN', (0,0), (-1,-1), 'TOP'),
                              ]))
        story.append(t)
        story.append(Spacer(0,1*cm))
        # text
        story.append(Paragraph("%s" % assignment.description.replace('\r\n','<br/>'), stylesheet['Paragraph']))
        return story

    def get_assignment_votes(self, assignment):
        votes = []
        for candidate in assignment.candidates:
            tmplist = [[candidate, assignment.is_elected(candidate)], []]
            for poll in assignment.poll_set.all():
                if poll.published:
            	    if poll.get_options().filter(candidate=candidate).exists():
                        option = AssignmentOption.objects.filter(poll=poll).get(candidate=candidate)
                        try:
                            tmplist[1].append(option.get_votes()[0])
                        except IndexError:
                            tmplist[1].append('–')
                    else:
                        tmplist[1].append("-")
                votes.append(tmplist)
        return votes


class Config(FormView):
    permission_required = 'config.can_manage_config'
    form_class = ConfigForm
    template_name = 'assignment/config.html'

    def get_initial(self):
        return {
            'assignment_publish_winner_results_only': config['assignment_publish_winner_results_only'],
            'assignment_pdf_ballot_papers_selection': config['assignment_pdf_ballot_papers_selection'],
            'assignment_pdf_ballot_papers_number': config['assignment_pdf_ballot_papers_number'],
            'assignment_pdf_title': config['assignment_pdf_title'],
            'assignment_pdf_preamble': config['assignment_pdf_preamble'],
        }

    def form_valid(self, form):
        if form.cleaned_data['assignment_publish_winner_results_only']:
            config['assignment_publish_winner_results_only'] = True
        else:
            config['assignment_publish_winner_results_only'] = False
        config['assignment_pdf_ballot_papers_selection'] = form.cleaned_data['assignment_pdf_ballot_papers_selection']
        config['assignment_pdf_ballot_papers_number'] = form.cleaned_data['assignment_pdf_ballot_papers_number']
        config['assignment_pdf_title'] = form.cleaned_data['assignment_pdf_title']
        config['assignment_pdf_preamble'] = form.cleaned_data['assignment_pdf_preamble']
        messages.success(self.request, _('Election settings successfully saved.'))
        return super(Config, self).form_valid(form)


def register_tab(request):
    selected = True if request.path.startswith('/assignment/') else False
    return Tab(
        title=_('Elections'),
        url=reverse('assignment_overview'),
        permission=request.user.has_perm('assignment.can_see_assignment') or request.user.has_perm('assignment.can_nominate_other') or request.user.has_perm('assignment.can_nominate_self') or request.user.has_perm('assignment.can_manage_assignment'),
        selected=selected,
    )