from django.db.utils import OperationalError
from django.contrib.contenttypes.models import ContentType

from utils import models, setting_handler
from utils.logger import get_logger

logger = get_logger(__name__)

PLUGIN_NAME = "Popular Articles"
SHORT_NAME = "popular_articles"
DESCRIPTION = "This is a homepage element that renders popular articles."
AUTHOR = "Martin Paul Eve"
VERSION = "1.0"


def get_self():
    try:
        plugin = models.Plugin.objects.get(
            name=PLUGIN_NAME,
        )
        return plugin
    except models.Plugin.DoesNotExist:
        return None


def install():
    import core.models as core_models
    import journal.models as journal_models

    plugin, c = models.Plugin.objects.get_or_create(
        name=PLUGIN_NAME,
        version=VERSION,
        enabled=True,
        display_name="Popular Articles",
        homepage_element=True,
    )

    if c:
        logger.debug("Plugin {} created".format(PLUGIN_NAME))

    plugin_group_name = "plugin:{plugin_name}".format(plugin_name=PLUGIN_NAME)

    setting = setting_handler.create_setting(
        setting_group_name=plugin_group_name,
        setting_name="most_popular",
        type="boolean",
        pretty_name="Display Most Popular Articles",
        description="Displays the most popular articles.",
        is_translatable=False,
    )
    setting_handler.get_or_create_default_setting(
        setting=setting,
        default_value="",
    )
    setting = setting_handler.create_setting(
        setting_group_name=plugin_group_name,
        setting_name="num_most_popular",
        type="number",
        pretty_name="Number of Most Popular Articles to Display",
        description="Determines how many popular articles we should display.",
        is_translatable=False,
    )
    setting_handler.get_or_create_default_setting(
        setting=setting,
        default_value=3,
    )
    setting = setting_handler.create_setting(
        setting_group_name=plugin_group_name,
        setting_name="most_popular_time",
        type="text",
        pretty_name="Most Popular Timescale",
        description="Select from this week, this month or this year.",
        is_translatable=False,
    )
    setting_handler.get_or_create_default_setting(
        setting=setting,
        default_value="weekly",
    )

    # check whether this homepage element has already been installed for all journals
    journals = journal_models.Journal.objects.all()

    for journal in journals:
        content_type = ContentType.objects.get_for_model(journal)
        element, created = core_models.HomepageElement.objects.get_or_create(
            name=PLUGIN_NAME,
            configure_url="popular_articles_setup",
            template_path="journal/homepage_elements/popular.html",
            content_type=content_type,
            object_id=journal.pk,
            has_config=True,
        )

        element.save()


def hook_registry():
    try:
        install()
        return {
            "yield_homepage_element_context": {
                "module": "core.homepage_elements.popular.hooks",
                "function": "yield_homepage_element_context",
                "name": PLUGIN_NAME,
            }
        }
    except OperationalError:
        # if we get here the database hasn't yet been created
        return {}
    except BaseException:
        return {}