__copyright__ = "Copyright 2017 Birkbeck, University of London"
__author__ = "Martin Paul Eve & Andy Byers"
__license__ = "AGPL v3"
__maintainer__ = "Birkbeck Centre for Technology and Publishing"

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 = "About"
DESCRIPTION = "This is a homepage element that renders About this Journal section."
AUTHOR = "Martin Paul Eve & Andy Byers"
VERSION = "1.1"


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,
        defaults={
            "homepage_element": True,
            "enabled": True,
            "version": VERSION,
            "display_name": "About",
        },
    )

    if not c:
        plugin.version = VERSION
        plugin.save()

    if c:
        logger.debug("Plugin installed.")

    plugin_group_name = "plugin:{plugin_name}".format(plugin_name=plugin.name)
    setting_group, c = core_models.SettingGroup.objects.get_or_create(
        name=plugin_group_name,
    )
    setting, c = core_models.Setting.objects.get_or_create(
        name="about_title",
        group=setting_group,
        defaults={
            "pretty_name": "About Block Title",
            "types": "text",
            "description": "Sets the title of the About Block",
            "is_translatable": True,
        },
    )

    if c:
        logger.debug("Setting created")

    setting_handler.get_or_create_default_setting(
        setting,
        default_value="About this Journal",
    )

    # 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="journal_description",
            template_path="journal/homepage_elements/about.html",
            content_type=content_type,
            object_id=journal.pk,
            has_config=True,
        )

        element.save()


def hook_registry():
    try:
        return {
            "yield_homepage_element_context": {
                "module": "core.homepage_elements.about.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 {}