from boards.abstracts.settingsmanager import get_settings_manager, \
    SETTING_LAST_NOTIFICATION_ID, SETTING_IMAGE_VIEWER, SETTING_ONLY_FAVORITES
from boards.models import Banner
from boards.models.user import Notification
from boards import settings
from boards.models import Post, Tag, Thread
from boards.settings import SECTION_FORMS, SECTION_VIEW, SECTION_VERSION

THEME_CSS = 'css/{}/base_page.css'

CONTEXT_SITE_NAME = 'site_name'
CONTEXT_VERSION = 'version'
CONTEXT_THEME_CSS = 'theme_css'
CONTEXT_THEME = 'theme'
CONTEXT_PPD = 'posts_per_day'
CONTEXT_USER = 'user'
CONTEXT_NEW_NOTIFICATIONS_COUNT = 'new_notifications_count'
CONTEXT_USERNAMES = 'usernames'
CONTEXT_TAGS_STR = 'tags_str'
CONTEXT_IMAGE_VIEWER = 'image_viewer'
CONTEXT_HAS_FAV_THREADS = 'has_fav_threads'
CONTEXT_POW_DIFFICULTY = 'pow_difficulty'
CONTEXT_NEW_POST_COUNT = 'new_post_count'
CONTEXT_BANNERS = 'banners'
CONTEXT_ONLY_FAVORITES = 'only_favorites'


def get_notifications(context, settings_manager):
    usernames = settings_manager.get_notification_usernames()
    new_notifications_count = 0
    if usernames:
        last_notification_id = settings_manager.get_setting(
            SETTING_LAST_NOTIFICATION_ID)

        new_notifications_count = Notification.objects.get_notification_posts(
                usernames=usernames, last=last_notification_id).only('id').count()
    context[CONTEXT_NEW_NOTIFICATIONS_COUNT] = new_notifications_count
    context[CONTEXT_USERNAMES] = usernames


def get_new_post_count(context, settings_manager):
    fav_threads = settings_manager.get_fav_threads()
    if fav_threads:
        fav_thread_ops = Post.objects.filter(id__in=fav_threads.keys()) \
            .order_by('-pub_time').only('thread_id', 'pub_time')
        ops = [{'op': op, 'last_id': fav_threads[str(op.id)]} for op in fav_thread_ops]
        count = Thread.objects.get_new_post_count(ops)
        if count > 0:
            context[CONTEXT_NEW_POST_COUNT] = '(+{})'.format(count)


def user_and_ui_processor(request):
    context = dict()

    context[CONTEXT_PPD] = float(Post.objects.get_posts_per_day())

    settings_manager = get_settings_manager(request)
    fav_tags = settings_manager.get_fav_tags()

    context[CONTEXT_TAGS_STR] = Tag.objects.get_tag_url_list(fav_tags)
    theme = settings_manager.get_theme()
    context[CONTEXT_THEME] = theme

    # TODO Use static here
    context[CONTEXT_THEME_CSS] = THEME_CSS.format(theme)

    context[CONTEXT_VERSION] = settings.get(SECTION_VERSION, 'Version')
    context[CONTEXT_SITE_NAME] = settings.get(SECTION_VERSION, 'SiteName')

    if settings.get_bool(SECTION_FORMS, 'LimitFirstPosting'):
        context[CONTEXT_POW_DIFFICULTY] = settings.get_int(SECTION_FORMS, 'PowDifficulty')

    context[CONTEXT_IMAGE_VIEWER] = settings_manager.get_setting(
        SETTING_IMAGE_VIEWER,
        default=settings.get(SECTION_VIEW, 'DefaultImageViewer'))

    context[CONTEXT_HAS_FAV_THREADS] =\
        len(settings_manager.get_fav_threads()) > 0

    context[CONTEXT_BANNERS] = Banner.objects.order_by('-id')
    context[CONTEXT_ONLY_FAVORITES] = settings_manager.get_setting(
            SETTING_ONLY_FAVORITES, default=False)

    get_notifications(context, settings_manager)
    get_new_post_count(context, settings_manager)

    return context