from operator import attrgetter
import random

from bs4 import BeautifulSoup
from django.utils.translation import ugettext as _
from natsort import natsorted
from reportlab.lib import colors
from reportlab.lib.units import cm
from reportlab.platypus import PageBreak, Paragraph, Spacer, Table, TableStyle

from openslides.config.api import config
from openslides.participant.models import Group, User
from openslides.utils.pdf import stylesheet

from .models import Category, Motion

# Needed to count the delegates
# TODO: find another way to do this.


def motions_to_pdf(pdf):
    """
    Create a PDF with all motions.
    """
    motions = Motion.objects.all()
    motions = natsorted(motions, key=attrgetter('identifier'))
    all_motion_cover(pdf, motions)
    for motion in motions:
        pdf.append(PageBreak())
        motion_to_pdf(pdf, motion)


def motion_to_pdf(pdf, motion):
    """
    Create a PDF for one motion.
    """
    identifier = ''
    if motion.identifier:
        identifier = ' %s' % motion.identifier
    pdf.append(Paragraph('%s%s: %s' % (_('Motion'), identifier, motion.title), stylesheet['Heading1']))

    motion_data = []

    # submitter
    cell1a = []
    cell1a.append(Spacer(0, 0.2 * cm))
    cell1a.append(Paragraph("<font name='Ubuntu-Bold'>%s:</font>" % _("Submitter"),
                            stylesheet['Heading4']))
    cell1b = []
    cell1b.append(Spacer(0, 0.2 * cm))
    for submitter in motion.submitter.all():
        cell1b.append(Paragraph(str(submitter), stylesheet['Normal']))
    motion_data.append([cell1a, cell1b])

    # TODO: choose this in workflow
    if motion.state.allow_submitter_edit:
        # Cell for the signature
        cell2a = []
        cell2b = []
        cell2a.append(Paragraph("<font name='Ubuntu-Bold'>%s:</font>" %
                                _("Signature"), stylesheet['Heading4']))
        cell2b.append(Paragraph(42 * "_", stylesheet['Signaturefield']))
        cell2b.append(Spacer(0, 0.1 * cm))
        cell2b.append(Spacer(0, 0.2 * cm))
        motion_data.append([cell2a, cell2b])

    # supporters
    if config['motion_min_supporters']:
        cell3a = []
        cell3b = []
        cell3a.append(Paragraph("<font name='Ubuntu-Bold'>%s:</font><seqreset id='counter'>"
                                % _("Supporters"), stylesheet['Heading4']))
        supporters = motion.supporter.all()
        for supporter in supporters:
            cell3b.append(Paragraph("<seq id='counter'/>.&nbsp; %s" % str(supporter),
                                    stylesheet['Normal']))
        cell3b.append(Spacer(0, 0.2 * cm))
        motion_data.append([cell3a, cell3b])

    # Motion state
    cell4a = []
    cell4b = []
    cell4a.append(Paragraph("<font name='Ubuntu-Bold'>%s:</font>" % _("State"),
                            stylesheet['Heading4']))
    cell4b.append(Paragraph(_(motion.state.name), stylesheet['Normal']))
    motion_data.append([cell4a, cell4b])

    # Version number
    if motion.versions.count() > 1:
        version = motion.get_active_version()
        cell5a = []
        cell5b = []
        cell5a.append(Paragraph("<font name='Ubuntu-Bold'>%s:</font>" % _("Version"),
                                stylesheet['Heading4']))
        cell5b.append(Paragraph("%s" % version.version_number, stylesheet['Normal']))
        motion_data.append([cell5a, cell5b])

    # voting result
    polls = []
    for poll in motion.polls.all():
        if not poll.has_votes():
            continue
        polls.append(poll)

    if polls:
        cell6a = []
        cell6b = []
        cell6a.append(Paragraph("<font name='Ubuntu-Bold'>%s:</font>" %
                                _("Vote result"), stylesheet['Heading4']))
        ballotcounter = 0
        for poll in polls:
            ballotcounter += 1
            option = poll.get_options()[0]
            yes, no, abstain = (option['Yes'], option['No'], option['Abstain'])
            valid, invalid, votescast = ('', '', '')
            if poll.votesvalid is not None:
                valid = "<br/>%s: %s" % (_("Valid votes"), poll.print_votesvalid())
            if poll.votesinvalid is not None:
                invalid = "<br/>%s: %s" % (_("Invalid votes"), poll.print_votesinvalid())
            if poll.votescast is not None:
                votescast = "<br/>%s: %s" % (_("Votes cast"), poll.print_votescast())
            if len(polls) > 1:
                cell6b.append(Paragraph("%s. %s" % (ballotcounter, _("Vote")),
                                        stylesheet['Bold']))
            cell6b.append(Paragraph(
                "%s: %s <br/> %s: %s <br/> %s: %s <br/> %s %s %s" %
                (_("Yes"), yes, _("No"), no, _("Abstention"), abstain, valid, invalid, votescast),
                stylesheet['Normal']))
            cell6b.append(Spacer(0, 0.2 * cm))
        motion_data.append([cell6a, cell6b])

    # Creating Table
    table = Table(motion_data)
    table._argW[0] = 4.5 * cm
    table._argW[1] = 11 * cm
    table.setStyle(TableStyle([('BOX', (0, 0), (-1, -1), 1, colors.black),
                               ('VALIGN', (0, 0), (-1, -1), 'TOP')]))
    pdf.append(table)
    pdf.append(Spacer(0, 1 * cm))

    # motion title
    pdf.append(Paragraph(motion.title, stylesheet['Heading3']))

    # motion text
    convert_html_to_reportlab(pdf, motion.text)
    pdf.append(Spacer(0, 1 * cm))

    # motion reason
    if motion.reason:
        pdf.append(Paragraph(_("Reason") + ":", stylesheet['Heading3']))
        convert_html_to_reportlab(pdf, motion.reason)
    return pdf


def convert_html_to_reportlab(pdf, text):
    # parsing and replacing not supported html tags for reportlab...
    soup = BeautifulSoup(text)
    # read all list elements...
    for element in soup.find_all('li'):
        # ... and replace ul list elements with <para><bullet>&bull;</bullet>...<para>
        if element.parent.name == "ul":
            # nested lists
            if element.ul or element.ol:
                for i in element.find_all('li'):
                    element.insert_before(i)
                element.clear()
            else:
                element.name = "para"
                bullet_tag = soup.new_tag("bullet")
                bullet_tag.string = u"•"
                element.insert(0, bullet_tag)
        # ... and replace ol list elements with <para><bullet><seq id="%id"></seq>.</bullet>...</para>
        if element.parent.name == "ol":
            # set list id if element is the first of numbered list
            if not element.find_previous_sibling():
                id = random.randrange(0, 101)
            # nested lists
            if element.ul or element.ol:
                for i in element.find_all('li'):
                    element.insert_before(i)
                element.clear()
            else:
                element.name = "para"
                element.insert(0, soup.new_tag("bullet"))
                element.bullet.insert(0, soup.new_tag("seq"))
                element.bullet.seq['id'] = id
                element.bullet.insert(1, ".")
    # remove tags which are not supported by reportlab (replace tags with their children tags)
    for tag in soup.find_all('ul'):
        tag.unwrap()
    for tag in soup.find_all('ol'):
        tag.unwrap()
    for tag in soup.find_all('li'):
        tag.unwrap()
    for tag in soup.find_all('span'):
        tag.unwrap()
    # print paragraphs with numbers
    text = soup.body.contents
    paragraph_number = 1
    for paragraph in text:
        paragraph = str(paragraph)
        # ignore empty paragraphs (created by newlines/tabs of ckeditor)
        if paragraph == '\n' or paragraph == '\n\n' or paragraph == '\n\t':
            continue
        if "<pre>" in paragraph:
            txt = paragraph.replace('\n', '<br/>').replace(' ', '&nbsp;')
            if config["motion_pdf_paragraph_numbering"]:
                pdf.append(Paragraph(txt, stylesheet['InnerMonotypeParagraph'], str(paragraph_number)))
                paragraph_number += 1
            else:
                pdf.append(Paragraph(txt, stylesheet['InnerMonotypeParagraph']))
        elif "<para>" in paragraph:
            pdf.append(Paragraph(paragraph, stylesheet['InnerListParagraph']))
        elif "<seqreset" in paragraph:
            pass
        elif "<h1>" in paragraph:
            pdf.append(Paragraph(paragraph, stylesheet['InnerH1Paragraph']))
        elif "<h2>" in paragraph:
            pdf.append(Paragraph(paragraph, stylesheet['InnerH2Paragraph']))
        elif "<h3>" in paragraph:
            pdf.append(Paragraph(paragraph, stylesheet['InnerH3Paragraph']))
        else:
            if config["motion_pdf_paragraph_numbering"]:
                pdf.append(Paragraph(paragraph, stylesheet['InnerParagraph'], str(paragraph_number)))
                paragraph_number += 1
            else:
                pdf.append(Paragraph(paragraph, stylesheet['InnerParagraph']))


def all_motion_cover(pdf, motions):
    """
    Create a coverpage for all motions.
    """
    pdf.append(Paragraph(config["motion_pdf_title"], stylesheet['Heading1']))

    preamble = config["motion_pdf_preamble"]
    if preamble:
        pdf.append(Paragraph("%s" % preamble.replace('\r\n', '<br/>'), stylesheet['Paragraph']))

    pdf.append(Spacer(0, 0.75 * cm))

    # list of categories
    categories = False
    for i, category in enumerate(Category.objects.all()):
        categories = True
        if i == 0:
            pdf.append(Paragraph(_("Categories"), stylesheet['Heading2']))
        pdf.append(Paragraph("%s &nbsp;&nbsp; %s" % (category.prefix, category.name), stylesheet['Paragraph']))
    if categories:
        pdf.append(PageBreak())

    # list of motions
    if not motions:
        pdf.append(Paragraph(_("No motions available."), stylesheet['Heading3']))
    else:
        for motion in motions:
            identifier = ''
            if motion.identifier:
                identifier = ' %s' % motion.identifier
            pdf.append(Paragraph('%s%s: %s' % (_('Motion'), identifier, motion.title), stylesheet['Heading3']))


def motion_poll_to_pdf(pdf, poll):
    circle = "*"  # = Unicode Character 'HEAVY LARGE CIRCLE' (U+2B55)
    cell = []
    cell.append(Spacer(0, 0.8 * cm))
    cell.append(Paragraph(_("Motion No. %s") % poll.motion.identifier, stylesheet['Ballot_title']))
    cell.append(Paragraph(poll.motion.title, stylesheet['Ballot_subtitle']))
    cell.append(Paragraph(_("%d. Vote") % poll.poll_number, stylesheet['Ballot_description']))
    cell.append(Spacer(0, 0.5 * cm))
    cell.append(Paragraph("<font name='circlefont' size='15'>%s</font> <font name='Ubuntu'>%s</font>"
                % (circle, _("Yes")), stylesheet['Ballot_option']))
    cell.append(Paragraph("<font name='circlefont' size='15'>%s</font> <font name='Ubuntu'>%s</font>"
                % (circle, _("No")), stylesheet['Ballot_option']))
    cell.append(Paragraph("<font name='circlefont' size='15'>%s</font> <font name='Ubuntu'>%s</font>"
                % (circle, _("Abstention")), stylesheet['Ballot_option']))
    data = []
    # get ballot papers config values
    ballot_papers_selection = config["motion_pdf_ballot_papers_selection"]
    ballot_papers_number = config["motion_pdf_ballot_papers_number"]

    # set number of ballot papers
    if ballot_papers_selection == "NUMBER_OF_DELEGATES":
        # TODO: get this number from persons
        try:
            if Group.objects.get(pk=3):
                number = User.objects.filter(groups__pk=3).count()
        except Group.DoesNotExist:
            number = 0
    elif ballot_papers_selection == "NUMBER_OF_ALL_PARTICIPANTS":
        # TODO: get the number from the persons
        number = int(User.objects.count())
    else:  # ballot_papers_selection == "CUSTOM_NUMBER"
        number = int(ballot_papers_number)
    number = max(1, number)

    # print ballot papers
    if number > 0:
        # TODO: try [cell, cell] * (number / 2)
        for user in range(number / 2):
            data.append([cell, cell])
        rest = number % 2
        if rest:
            data.append([cell, ''])
        t = Table(data, 10.5 * cm, 7.42 * cm)
        t.setStyle(TableStyle(
            [('GRID', (0, 0), (-1, -1), 0.25, colors.grey),
             ('VALIGN', (0, 0), (-1, -1), 'TOP')]))
        pdf.append(t)