from django.core.validators import MinValueValidator
from django.utils.translation import ugettext as _
from django.utils.translation import ugettext_lazy

from openslides.core.config import ConfigVariable
from openslides.poll.models import PERCENT_BASE_CHOICES


def get_config_variables():
    """
    Generator which yields all config variables of this app.

    They are grouped in 'Ballot and ballot papers' and 'PDF'. The generator has
    to be evaluated during app loading (see apps.py).
    """
    # Ballot and ballot papers
    yield ConfigVariable(
        name='assignments_poll_vote_values',
        default_value='auto',
        input_type='choice',
        label=ugettext_lazy('Election method'),
        choices=(
            {'value': 'auto', 'display_name': ugettext_lazy('Automatic assign of method')},
            {'value': 'votes', 'display_name': ugettext_lazy('Always one option per candidate')},
            {'value': 'yesnoabstain', 'display_name': ugettext_lazy('Always Yes-No-Abstain per candidate')}),
        weight=410,
        group=ugettext_lazy('Elections'),
        subgroup=ugettext_lazy('Ballot and ballot papers'))

    yield ConfigVariable(
        name='assignments_poll_100_percent_base',
        default_value='WITHOUT_INVALID',
        input_type='choice',
        label=ugettext_lazy('The 100 % base of an election result consists of'),
        choices=PERCENT_BASE_CHOICES,
        weight=420,
        group=ugettext_lazy('Elections'),
        subgroup=ugettext_lazy('Ballot and ballot papers'))

    yield ConfigVariable(
        name='assignments_pdf_ballot_papers_selection',
        default_value='CUSTOM_NUMBER',
        input_type='choice',
        label=ugettext_lazy('Number of ballot papers (selection)'),
        choices=(
            {'value': 'NUMBER_OF_DELEGATES', 'display_name': ugettext_lazy('Number of all delegates')},
            {'value': 'NUMBER_OF_ALL_PARTICIPANTS', 'display_name': ugettext_lazy('Number of all participants')},
            {'value': 'CUSTOM_NUMBER', 'display_name': ugettext_lazy('Use the following custom number')}),
        weight=430,
        group=ugettext_lazy('Elections'),
        subgroup=ugettext_lazy('Ballot and ballot papers'))

    yield ConfigVariable(
        name='assignments_pdf_ballot_papers_number',
        default_value=8,
        input_type='integer',
        label=ugettext_lazy('Custom number of ballot papers'),
        weight=440,
        group=ugettext_lazy('Elections'),
        subgroup=ugettext_lazy('Ballot and ballot papers'),
        validators=(MinValueValidator(1),))

    yield ConfigVariable(
        name='assignments_publish_winner_results_only',
        default_value=False,
        input_type='boolean',
        label=ugettext_lazy('Publish election result for elected candidates only '
                            '(projector view)'),
        weight=450,
        group=ugettext_lazy('Elections'),
        subgroup=ugettext_lazy('Ballot and ballot papers'))

    # PDF

    yield ConfigVariable(
        name='assignments_pdf_title',
        default_value=_('Elections'),
        label=ugettext_lazy('Title for PDF document (all elections)'),
        weight=460,
        group=ugettext_lazy('Elections'),
        subgroup=ugettext_lazy('PDF'),
        translatable=True)

    yield ConfigVariable(
        name='assignments_pdf_preamble',
        default_value='',
        label=ugettext_lazy('Preamble text for PDF document (all elections)'),
        weight=470,
        group=ugettext_lazy('Elections'),
        subgroup=ugettext_lazy('PDF'))