from django.conf import settings
from django.template.response import TemplateResponse
from django.urls import include, path, reverse, reverse_lazy
from django.utils.cache import add_never_cache_headers
from django.utils.translation import gettext_lazy as _
from django.utils.translation import ngettext

import wagtail.admin.rich_text.editors.draftail.features as draftail_features
from wagtail import hooks
from wagtail.admin.admin_url_finder import (
    ModelAdminURLFinder,
    register_admin_url_finder,
)
from wagtail.admin.menu import MenuItem
from wagtail.admin.navigation import get_site_for_user
from wagtail.admin.search import SearchArea
from wagtail.admin.site_summary import SummaryItem
from wagtail.documents import admin_urls, get_document_model
from wagtail.documents.api.admin.views import DocumentsAdminAPIViewSet
from wagtail.documents.forms import GroupDocumentPermissionFormSet
from wagtail.documents.permissions import permission_policy
from wagtail.documents.rich_text import DocumentLinkHandler
from wagtail.documents.rich_text.contentstate import (
    ContentstateDocumentLinkConversionRule,
)
from wagtail.documents.rich_text.editor_html import EditorHTMLDocumentLinkConversionRule
from wagtail.documents.views.bulk_actions import (
    AddTagsBulkAction,
    AddToCollectionBulkAction,
    DeleteBulkAction,
)
from wagtail.documents.views.chooser import viewset as chooser_viewset
from wagtail.models import BaseViewRestriction
from wagtail.wagtail_hooks import require_wagtail_login


@hooks.register("register_admin_urls")
def register_admin_urls():
    return [
        path("documents/", include(admin_urls, namespace="wagtaildocs")),
    ]


@hooks.register("construct_admin_api")
def construct_admin_api(router):
    router.register_endpoint("documents", DocumentsAdminAPIViewSet)


class DocumentsMenuItem(MenuItem):
    def is_shown(self, request):
        return permission_policy.user_has_any_permission(
            request.user, ["add", "change", "delete"]
        )


@hooks.register("register_admin_menu_item")
def register_documents_menu_item():
    return DocumentsMenuItem(
        _("Documents"),
        reverse("wagtaildocs:index"),
        name="documents",
        icon_name="doc-full-inverse",
        order=400,
    )


@hooks.register("register_rich_text_features")
def register_document_feature(features):
    features.register_link_type(DocumentLinkHandler)

    features.register_editor_plugin(
        "draftail",
        "document-link",
        draftail_features.EntityFeature(
            {
                "type": "DOCUMENT",
                "icon": "doc-full-inverse",
                "description": _("Document"),
                "chooserUrls": {
                    "documentChooser": reverse_lazy("wagtaildocs_chooser:choose")
                },
            },
            js=["wagtaildocs/js/document-chooser-modal.js"],
        ),
    )

    features.register_converter_rule(
        "editorhtml", "document-link", EditorHTMLDocumentLinkConversionRule
    )
    features.register_converter_rule(
        "contentstate", "document-link", ContentstateDocumentLinkConversionRule
    )

    features.default_features.append("document-link")


class DocumentsSummaryItem(SummaryItem):
    order = 300
    template_name = "wagtaildocs/homepage/site_summary_documents.html"

    def get_context_data(self, parent_context):
        site_name = get_site_for_user(self.request.user)["site_name"]

        return {
            "total_docs": permission_policy.instances_user_has_any_permission_for(
                self.request.user, {"add", "change", "delete", "choose"}
            ).count(),
            "site_name": site_name,
        }

    def is_shown(self):
        return permission_policy.user_has_any_permission(
            self.request.user, ["add", "change", "delete"]
        )


@hooks.register("construct_homepage_summary_items")
def add_documents_summary_item(request, items):
    items.append(DocumentsSummaryItem(request))


class DocsSearchArea(SearchArea):
    def is_shown(self, request):
        return permission_policy.user_has_any_permission(
            request.user, ["add", "change", "delete"]
        )


@hooks.register("register_admin_search_area")
def register_documents_search_area():
    return DocsSearchArea(
        _("Documents"),
        reverse("wagtaildocs:index"),
        name="documents",
        icon_name="doc-full-inverse",
        order=400,
    )


@hooks.register("register_group_permission_panel")
def register_document_permissions_panel():
    return GroupDocumentPermissionFormSet


@hooks.register("describe_collection_contents")
def describe_collection_docs(collection):
    docs_count = get_document_model().objects.filter(collection=collection).count()
    if docs_count:
        url = reverse("wagtaildocs:index") + ("?collection_id=%d" % collection.id)
        return {
            "count": docs_count,
            "count_text": ngettext(
                "%(count)s document", "%(count)s documents", docs_count
            )
            % {"count": docs_count},
            "url": url,
        }


@hooks.register("before_serve_document")
def check_view_restrictions(document, request):
    """
    Check whether there are any view restrictions on this document which are
    not fulfilled by the given request object. If there are, return an
    HttpResponse that will notify the user of that restriction (and possibly
    include a password / login form that will allow them to proceed). If
    there are no such restrictions, return None
    """
    for restriction in document.collection.get_view_restrictions():
        if not restriction.accept_request(request):
            if restriction.restriction_type == BaseViewRestriction.PASSWORD:
                from wagtail.forms import PasswordViewRestrictionForm

                form = PasswordViewRestrictionForm(
                    instance=restriction,
                    initial={"return_url": request.get_full_path()},
                )
                action_url = reverse(
                    "wagtaildocs_authenticate_with_password", args=[restriction.id]
                )

                password_required_template = getattr(
                    settings,
                    "WAGTAILDOCS_PASSWORD_REQUIRED_TEMPLATE",
                    "wagtaildocs/password_required.html",
                )

                context = {"form": form, "action_url": action_url}
                response = TemplateResponse(
                    request, password_required_template, context
                )
                add_never_cache_headers(response)
                return response

            elif restriction.restriction_type in [
                BaseViewRestriction.LOGIN,
                BaseViewRestriction.GROUPS,
            ]:
                return require_wagtail_login(next=request.get_full_path())


class DocumentAdminURLFinder(ModelAdminURLFinder):
    edit_url_name = "wagtaildocs:edit"
    permission_policy = permission_policy


register_admin_url_finder(get_document_model(), DocumentAdminURLFinder)


for action_class in [AddTagsBulkAction, AddToCollectionBulkAction, DeleteBulkAction]:
    hooks.register("register_bulk_action", action_class)


@hooks.register("register_admin_viewset")
def register_document_chooser_viewset():
    return chooser_viewset
