import datetime
import re
from urllib.parse import urljoin

from django import template
from django.conf import settings
from django.contrib.admin.utils import quote
from django.contrib.humanize.templatetags.humanize import intcomma, naturaltime
from django.contrib.messages.constants import DEFAULT_TAGS as MESSAGE_TAGS
from django.forms.utils import flatatt
from django.http.request import HttpHeaders
from django.middleware.csrf import get_token
from django.shortcuts import resolve_url as resolve_url_func
from django.template import Context
from django.template.base import token_kwargs
from django.template.defaultfilters import stringfilter
from django.urls import reverse
from django.urls.exceptions import NoReverseMatch
from django.utils import timezone
from django.utils.encoding import force_str
from django.utils.formats import get_format
from django.utils.html import avoid_wrapping, json_script
from django.utils.safestring import mark_safe
from django.utils.timesince import timesince
from django.utils.translation import gettext_lazy as _
from laces.templatetags.laces import component

from wagtail import hooks
from wagtail.admin.admin_url_finder import AdminURLFinder
from wagtail.admin.icons import get_icon_sprite_url
from wagtail.admin.localization import get_js_translation_strings
from wagtail.admin.menu import admin_menu
from wagtail.admin.search import admin_search_areas
from wagtail.admin.staticfiles import versioned_static as versioned_static_func
from wagtail.admin.telepath import JSContext
from wagtail.admin.ui import sidebar
from wagtail.admin.ui.menus import MenuItem
from wagtail.admin.utils import (
    get_admin_base_url,
    get_keyboard_key_labels_from_request,
    get_latest_str,
    get_user_display_name,
)
from wagtail.admin.views.bulk_action.registry import bulk_action_registry
from wagtail.admin.views.pages.utils import get_breadcrumbs_items_for_page
from wagtail.admin.widgets import Button, ButtonWithDropdown
from wagtail.admin.widgets.button import ListingButton
from wagtail.coreutils import (
    camelcase_to_underscore,
    get_content_type_label,
    get_locales_display_names,
)
from wagtail.coreutils import cautious_slugify as _cautious_slugify
from wagtail.models import (
    Locale,
    Page,
    PageViewRestriction,
)
from wagtail.users.utils import get_gravatar_url

register = template.Library()

register.filter("intcomma", intcomma)
register.filter("naturaltime", naturaltime)


@register.inclusion_tag("wagtailadmin/shared/breadcrumbs.html")
def breadcrumbs(items, is_expanded=False, classname=None, icon_name=None):
    return {
        "items": items,
        "is_expanded": is_expanded or len(items) == 1,
        "classname": classname,
        "icon_name": icon_name,
    }


@register.inclusion_tag("wagtailadmin/shared/breadcrumbs.html", takes_context=True)
def page_breadcrumbs(
    context,
    page,
    url_name,
    url_root_name=None,
    include_self=True,
    is_expanded=False,
    querystring_value="",
    trailing_breadcrumb_title=None,
    classname=None,
    icon_name=None,
):
    user = context["request"].user

    items = get_breadcrumbs_items_for_page(
        page,
        user,
        url_name,
        url_root_name,
        include_self,
        querystring_value,
    )

    if trailing_breadcrumb_title:
        items.append({"label": trailing_breadcrumb_title})

    if len(items) == 1:
        is_expanded = True

    return {
        "items": items,
        "is_expanded": is_expanded,
        "classname": classname,
        "icon_name": icon_name,
    }


@register.inclusion_tag("wagtailadmin/shared/search_other.html", takes_context=True)
def search_other(context, current=None):
    request = context["request"]

    return {
        "options_html": admin_search_areas.render_html(request, current),
        "request": request,
    }


@register.filter("ellipsistrim")
def ellipsistrim(value, max_length):
    if len(value) > max_length:
        truncd_val = value[:max_length]
        if not len(value) == (max_length + 1) and value[max_length + 1] != " ":
            truncd_val = truncd_val[: truncd_val.rfind(" ")]
        return truncd_val + "…"
    return value


@register.filter
def fieldtype(bound_field):
    try:
        return camelcase_to_underscore(bound_field.field.__class__.__name__)
    except AttributeError:
        try:
            return camelcase_to_underscore(bound_field.__class__.__name__)
        except AttributeError:
            return ""


@register.filter
def widgettype(bound_field):
    try:
        return camelcase_to_underscore(bound_field.field.widget.__class__.__name__)
    except AttributeError:
        try:
            return camelcase_to_underscore(bound_field.widget.__class__.__name__)
        except AttributeError:
            return ""


@register.simple_tag(takes_context=True)
def page_permissions(context, page):
    """
    Usage: {% page_permissions page as page_perms %}
    Sets the variable 'page_perms' to a PagePermissionTester object that can be queried to find out
    what actions the current logged-in user can perform on the given page.
    """
    return page.permissions_for_user(context["request"].user)


@register.simple_tag
def is_page(obj):
    """
    Usage: {% is_page obj as is_page %}
    Sets the variable 'is_page' to True if the given object is a Page instance,
    False otherwise. Useful in shared templates that accept both Page and
    non-Page objects (e.g. snippets with the optional features enabled).
    """
    return isinstance(obj, Page)


@register.simple_tag(takes_context=True)
def admin_edit_url(context, obj, user=None):
    """
    Usage: {% admin_edit_url obj user %}
    Returns the URL of the edit view for the given object and user using the
    registered AdminURLFinder for the object. The AdminURLFinder instance is
    cached in the context for the duration of the page request.
    The user argument is optional and defaults to request.user if request is
    available in the context.
    """
    if not user and "request" in context:
        user = context["request"].user
    if "admin_url_finder" not in context:
        context["admin_url_finder"] = AdminURLFinder(user)
    return context["admin_url_finder"].get_edit_url(obj)


@register.simple_tag
def admin_url_name(obj, action):
    """
    Usage: {% admin_url_name obj action %}
    Returns the URL name of the given action for the given object, e.g.
    'wagtailadmin_pages:edit' for a Page object and 'edit' action.
    Works with pages and snippets only.
    """
    if isinstance(obj, Page):
        return f"wagtailadmin_pages:{action}"
    return obj.snippet_viewset.get_url_name(action)


@register.simple_tag(takes_context=True)
def build_absolute_url(context, url):
    """
    Usage: {% build_absolute_url url %}
    Returns the absolute URL of the given URL based on the request's host.
    If the request doesn't exist in the context, falls back to
    WAGTAILADMIN_BASE_URL as the base URL.
    If the given URL is already absolute, or the request is a dummy preview
    request, returns it unchanged.
    """
    request = context.get("request")
    # If request is not found in the context, e.g. in notification emails,
    # fall back to WAGTAILADMIN_BASE_URL.
    if not request:
        return urljoin(get_admin_base_url(), url)
    # With a dummy preview request, the host has been overwritten to be the page
    # Site's host, which may not have been configured correctly. We don't want
    # to fall back to WAGTAILADMIN_BASE_URL either, as that may be different
    # from the original request's host in multi-site instances and may result in
    # users having to log in again. So we just return the URL unchanged.
    if getattr(request, "is_dummy", False):
        return url
    # Rewrite relative URLs to absolute URLs based on the request's host, but
    # leave absolute URLs unchanged.
    return request.build_absolute_uri(url)


@register.simple_tag
def latest_str(obj):
    """
    Usage: {% latest_str obj %}
    Returns the latest string representation of an object, making use of the
    latest revision where available to reflect draft changes.
    """
    return get_latest_str(obj)


@register.simple_tag
def classnames(*classes):
    """
    Usage <div class="{% classnames "w-base" classname active|yesno:"w-base--active," any_other_var %}"></div>
    Returns any args as a space-separated joined string for using in HTML class names.
    """

    flattened = []
    for classname in classes:
        if isinstance(classname, str):
            flattened.append(classname)
        elif hasattr(classname, "__iter__"):
            flattened.extend(classname)

    return " ".join([classname.strip() for classname in flattened if classname])


@register.simple_tag()
def test_collection_is_public(collection):
    """
    Usage: {% test_collection_is_public collection as is_public %}
    Sets 'is_public' to True if there are no collection view restrictions in place
    on this collection.
    """
    is_private = collection.get_view_restrictions().exists()
    return not is_private


@register.simple_tag(takes_context=True)
def test_page_is_public(context, page):
    """
    Usage: {% test_page_is_public page as is_public %}
    Sets 'is_public' to True iff there are no page view restrictions in place on
    this page.
    Caches the list of page view restrictions on the request, to avoid repeated
    DB queries on repeated calls.
    """
    if not hasattr(context["request"], "all_page_view_restriction_paths"):
        context[
            "request"
        ].all_page_view_restriction_paths = PageViewRestriction.objects.select_related(
            "page"
        ).values_list("page__path", flat=True)

    is_private = any(
        page.path.startswith(restricted_path)
        for restricted_path in context["request"].all_page_view_restriction_paths
    )

    return not is_private


@register.simple_tag
def hook_output(hook_name):
    """
    Example: {% hook_output 'insert_global_admin_css' %}
    Whenever we have a hook whose functions take no parameters and return a string, this tag can be used
    to output the concatenation of all of those return values onto the page.
    Note that the output is not escaped - it is the hook function's responsibility to escape unsafe content.
    """
    snippets = [fn() for fn in hooks.get_hooks(hook_name)]

    return mark_safe("".join(snippets))


@register.simple_tag
def base_url_setting(default=None):
    return get_admin_base_url() or default


@register.simple_tag
def allow_unicode_slugs():
    return getattr(settings, "WAGTAIL_ALLOW_UNICODE_SLUGS", True)


# Helpers for Widget.render_with_errors, our extension to the Django widget API that allows widgets to
# take on the responsibility of rendering their own error messages
@register.filter
def render_with_errors(bound_field):
    """
    Usage: {{ field|render_with_errors }} as opposed to {{ field }}.
    If the field (a BoundField instance) has errors on it, and the associated widget implements
    a render_with_errors method, call that; otherwise, call the regular widget rendering mechanism.
    """
    widget = bound_field.field.widget
    if bound_field.errors and hasattr(widget, "render_with_errors"):
        return widget.render_with_errors(
            bound_field.html_name,
            bound_field.value(),
            attrs={"id": bound_field.auto_id},
            errors=bound_field.errors,
        )
    else:
        attrs = {}
        # If the widget doesn't have an aria-describedby attribute,
        # and the field has help text, and the field has an id,
        # add an aria-describedby attribute pointing to the help text.
        # In this case, the corresponding help text element's id is set in the
        # wagtailadmin/shared/field.html template.

        # In Django 5.0 and up, this is done automatically, but we want to keep
        # this code because we use a different convention for the help text id
        # (we use -helptext suffix instead of Django's _helptext).
        if (
            not bound_field.field.widget.attrs.get("aria-describedby")
            and bound_field.field.help_text
            and bound_field.id_for_label
        ):
            attrs["aria-describedby"] = f"{bound_field.id_for_label}-helptext"
        return bound_field.as_widget(attrs=attrs)


@register.filter
def has_unrendered_errors(bound_field):
    """
    Return true if this field has errors that were not accounted for by render_with_errors, because
    the widget does not support the render_with_errors method
    """
    return bound_field.errors and not hasattr(
        bound_field.field.widget, "render_with_errors"
    )


@register.filter(is_safe=True)
@stringfilter
def cautious_slugify(value):
    return _cautious_slugify(value)


@register.simple_tag(takes_context=True)
def querystring(context, **kwargs):
    """
    Print out the current querystring. Any keyword arguments to this template
    tag will be added to the querystring before it is printed out.

        <a href="/page/{% querystring key='value' %}">

    Will result in something like:

        <a href="/page/?foo=bar&key=value">
    """
    request = context["request"]
    querydict = request.GET.copy()
    # Can't do querydict.update(kwargs), because QueryDict.update() appends to
    # the list of values, instead of replacing the values.
    for key, value in kwargs.items():
        if value is None:
            # Remove the key if the value is None
            querydict.pop(key, None)
        else:
            # Set the key otherwise
            querydict[key] = str(value)

    return "?" + querydict.urlencode()


@register.simple_tag(takes_context=True)
def pagination_querystring(context, page_number, page_key="p"):
    """
    Print out a querystring with an updated page number:

        {% if page.has_next_page %}
            <a href="{% pagination_link page.next_page_number %}">Next page</a>
        {% endif %}
    """
    return querystring(context, **{page_key: page_number})


@register.inclusion_tag(
    "wagtailadmin/pages/listing/_pagination.html", takes_context=True
)
def paginate(context, page, base_url="", page_key="p", classname=""):
    """
    Print pagination previous/next links, and the page count. Take the
    following arguments:

    page
        The current page of results. This should be a Django pagination `Page`
        instance

    base_url
        The base URL of the next/previous page, with no querystring.
        This is optional, and defaults to the current page by just printing the
        querystring for the next/previous page.

    page_key
        The name of the page variable in the query string. Defaults to 'p'.

    classname
        Extra classes to add to the next/previous links.
    """
    request = context["request"]
    return {
        "base_url": base_url,
        "classname": classname,
        "request": request,
        "page": page,
        "page_key": page_key,
        "paginator": page.paginator,
    }


@register.inclusion_tag("wagtailadmin/shared/buttons.html", takes_context=True)
def page_listing_buttons(context, page, user, next_url=None):
    next_url = next_url or context["request"].path
    button_hooks = hooks.get_hooks("register_page_listing_buttons")

    hook_buttons = []
    for hook in button_hooks:
        hook_buttons.extend(hook(page=page, next_url=next_url, user=user))

    buttons = []
    for button in hook_buttons:
        # Allow hooks to return either Button or MenuItem instances
        if isinstance(button, MenuItem):
            if button.is_shown(user):
                buttons.append(ListingButton.from_menu_item(button))
        elif button.show:
            buttons.append(button)

    buttons.sort()

    for hook in hooks.get_hooks("construct_page_listing_buttons"):
        hook(buttons, page=page, user=user, context=context)

    return {"page": page, "buttons": buttons}


@register.inclusion_tag(
    "wagtailadmin/pages/listing/_page_header_buttons.html", takes_context=True
)
def page_header_buttons(context, page, user, view_name):
    next_url = context["request"].path
    button_hooks = hooks.get_hooks("register_page_header_buttons")

    hook_buttons = []
    for hook in button_hooks:
        hook_buttons.extend(
            hook(page=page, user=user, next_url=next_url, view_name=view_name)
        )

    buttons = []
    for button in hook_buttons:
        # Allow hooks to return either Button or MenuItem instances
        if isinstance(button, MenuItem):
            if button.is_shown(user):
                buttons.append(Button.from_menu_item(button))
        elif button.show:
            buttons.append(button)

    buttons.sort()
    attrs = {
        # Hide the dropdown when the breadcrumbs are opened or closed, which
        # would make the dropdown's position off from the toggle button.
        "data-action": (
            "w-breadcrumbs:opened@document->w-dropdown#hide "
            "w-breadcrumbs:closed@document->w-dropdown#hide"
        ),
    }
    return {
        "buttons": buttons,
        "attrs": flatatt(attrs),
    }


@register.inclusion_tag("wagtailadmin/shared/buttons.html", takes_context=True)
def bulk_action_choices(context, app_label, model_name):
    bulk_actions_list = list(
        bulk_action_registry.get_bulk_actions_for_model(app_label, model_name)
    )
    bulk_actions_list.sort(key=lambda x: x.action_priority)

    bulk_action_more_list = bulk_actions_list[4:]
    bulk_actions_list = bulk_actions_list[:4]

    # These buttons are not re-rendered after AJAX search and filters are applied,
    # so don't include a 'next' parameter and let the JS construct it later.
    bulk_action_buttons = [
        ListingButton(
            action.display_name,
            reverse(
                "wagtail_bulk_action", args=[app_label, model_name, action.action_type]
            ),
            attrs={"aria-label": action.aria_label, "data-bulk-action-button": ""},
            priority=action.action_priority,
            classname=" ".join(action.classes | {"bulk-action-btn"}),
        )
        for action in bulk_actions_list
    ]

    if bulk_action_more_list:
        more_button = ButtonWithDropdown(
            label=_("More"),
            attrs={"title": _("More bulk actions")},
            classname="button button-secondary button-small",
            buttons=[
                Button(
                    label=action.display_name,
                    url=reverse(
                        "wagtail_bulk_action",
                        args=[app_label, model_name, action.action_type],
                    ),
                    attrs={
                        "aria-label": action.aria_label,
                        "data-bulk-action-button": "",
                    },
                    priority=action.action_priority,
                )
                for action in bulk_action_more_list
            ],
        )
        bulk_action_buttons.append(more_button)

    return {"buttons": bulk_action_buttons}


@register.inclusion_tag("wagtailadmin/shared/avatar.html")
def avatar(
    user=None,
    classname=None,
    size=None,
    tooltip=None,
    tooltip_html=None,
    edit_link=False,
):
    """
    Displays a user avatar using the avatar template
    Usage:
    {% load wagtailadmin_tags %}
    ...
    {% avatar user=request.user size='small' tooltip='JaneDoe' %}
    :param user: the user to get avatar information from (User)
    :param size: default None (None|'small'|'large'|'square')
    :param tooltip: Optional tooltip to display under the avatar (string)
    :param tooltip_html: Optional tooltip as an HTML element for rich content (string)
    :param edit_link: Optional edit link to display underneath the avatar (boolean)
    :return: Rendered template snippet
    """
    return {
        "user": user,
        "classname": classname,
        "size": size,
        "tooltip": tooltip,
        "tooltip_html": tooltip_html,
        "edit_link": edit_link,
    }


@register.simple_tag
def message_level_tag(message):
    """
    Return the tag for this message's level as defined in
    django.contrib.messages.constants.DEFAULT_TAGS, ignoring the project-level
    MESSAGE_TAGS setting (which end-users might customise).
    """
    return MESSAGE_TAGS.get(message.level)


@register.simple_tag
def message_tags(message):
    level_tag = message_level_tag(message)
    if message.extra_tags and level_tag:
        return message.extra_tags + " " + level_tag
    elif message.extra_tags:
        return message.extra_tags
    elif level_tag:
        return level_tag
    else:
        return ""


@register.filter("abs")
def _abs(val):
    return abs(val)


@register.filter
def admin_urlquote(value):
    return quote(value)


@register.simple_tag
def avatar_url(user, size=50, gravatar_only=False):
    """
    A template tag that receives a user and size and return
    the appropriate avatar url for that user.

    If the 'get_avatar_url' hook is defined, then that will intercept this
    logic and point to whatever resource that function returns. In this way,
    users can swap out the Wagtail UserProfile avatar for some other image or
    field of their own choosing without needing to alter anything on the
    existing models.

    Example usage: {% avatar_url request.user 50 %}

    """
    for hook_fn in hooks.get_hooks("get_avatar_url"):
        if url := hook_fn(user, size):
            return url

    if (
        not gravatar_only
        and hasattr(user, "wagtail_userprofile")
        and user.wagtail_userprofile.avatar
    ):
        return user.wagtail_userprofile.avatar.url

    if hasattr(user, "email"):
        gravatar_url = get_gravatar_url(user.email, size=size)
        if gravatar_url is not None:
            return gravatar_url

    return versioned_static_func("wagtailadmin/images/default-user-avatar.png")


@register.simple_tag(takes_context=True)
def admin_theme_classname(context):
    """
    Retrieves the theme name for the current user.
    """
    user = getattr(context.get("request"), "user", None)
    theme_name = (
        user.wagtail_userprofile.theme
        if hasattr(user, "wagtail_userprofile")
        else "system"
    )
    contrast_name = (
        user.wagtail_userprofile.contrast
        if hasattr(user, "wagtail_userprofile")
        else "system"
    )
    density_name = (
        user.wagtail_userprofile.density
        if hasattr(user, "wagtail_userprofile")
        else "default"
    )
    contrast_name = contrast_name.split("_")[0]
    return f"w-theme-{theme_name} w-density-{density_name} w-contrast-{contrast_name}"


@register.simple_tag(takes_context=True)
def admin_theme_color_scheme(context):
    """
    Retrieves the color-scheme of the active theme for current user.
    """
    user = context["request"].user
    profile = getattr(user, "wagtail_userprofile", None)
    theme_name = profile.theme if profile else "system"
    if theme_name == "system":
        return "dark light"
    return theme_name


@register.simple_tag
def absolute_static(path):
    """
    Variant of the {% versioned_static %}` tag for use in external systems, such as
    notification emails. Tries to form a full URL using WAGTAILADMIN_BASE_URL
    if the static URL isn't already a full URL.
    """
    return urljoin(base_url_setting(), versioned_static_func(path))


@register.simple_tag
def versioned_static(path):
    """
    Wrapper for Django's static file finder to append a cache-busting query parameter
    that updates on each Wagtail version
    """
    return versioned_static_func(path)


@register.inclusion_tag("wagtailadmin/shared/icon.html", takes_context=False)
def icon(name=None, classname=None, title=None, wrapped=False):
    """
    Abstracts away the actual icon implementation.

    Usage:
        {% load wagtailadmin_tags %}
        ...
        {% icon name="cogs" classname="icon--red" title="Settings" %}

    :param name: the icon name/id, required (string)
    :param classname: defaults to 'icon' if not provided (string)
    :param title: accessible label intended for screen readers (string)
    :return: Rendered template snippet (string)
    """
    if not name:
        raise ValueError("You must supply an icon name")

    return {
        "name": name,
        "classname": classname or "icon",
        "title": title,
        "wrapped": wrapped,
    }


@register.inclusion_tag("wagtailadmin/shared/status_tag.html")
def status(
    label=None,
    classname=None,
    url=None,
    title=None,
    hidden_label=None,
    attrs=None,
):
    """
    Generates a status-tag css with <span></span> or <a><a/> implementation.

    Usage:

        {% status label="live" url="/test/" title="title" hidden_label="current status:" classname="w-status--primary" %}

    :param label: the status test, (string)
    :param classname: defaults to 'status-tag' if not provided (string)
    :param url: the status url(to specify the use of anchor tag instead of default span), (string)
    :param title: accessible label intended for screen readers (string)
    :param hidden_label : the to specify the additional visually hidden span text, (string)
    :param attrs: any additional HTML attributes (as a string) to append to the root element
    :return: Rendered template snippet (string)

    """
    return {
        "label": label,
        "attrs": attrs,
        "classname": classname,
        "hidden_label": hidden_label,
        "title": title,
        "url": url,
    }


@register.filter()
def timesince_simple(d):
    """
    Returns a simplified timesince:
    19 hours, 48 minutes ago -> 19 hours ago
    1 week, 1 day ago -> 1 week ago
    0 minutes ago -> just now
    """
    time_period = timesince(d).split(",")[0]
    if time_period == avoid_wrapping(_("0 minutes")):
        return _("just now")
    return _("%(time_period)s ago") % {"time_period": time_period}


@register.simple_tag
def timesince_last_update(
    last_update, show_time_prefix=False, user_display_name="", use_shorthand=True
):
    """
    Returns:
         - the time of update if last_update is today, if show_time_prefix=True, the output will be prefixed with "at "
         - time since last update otherwise. Defaults to the simplified timesince,
           but can return the full string if needed
    """
    # translation usage below is intentionally verbose to be easier to work with translations

    current_datetime = timezone.now()
    if timezone.is_aware(current_datetime):
        # timezone support is enabled - make last_update timezone-aware and set to the user's
        # timezone
        current_datetime = timezone.localtime(current_datetime)
        if timezone.is_aware(last_update):
            local_datetime = timezone.localtime(last_update)
        else:
            local_datetime = timezone.make_aware(last_update)
    else:
        # timezone support is disabled - use naive datetimes
        if timezone.is_aware(last_update):
            local_datetime = timezone.make_naive(last_update)
        else:
            local_datetime = last_update

    # Use an explicit timestamp if last_update is today as seen in the current user's time zone
    if local_datetime.date() == current_datetime.date():
        time_str = local_datetime.strftime("%H:%M")

        if show_time_prefix:
            if user_display_name:
                return _("at %(time)s by %(user_display_name)s") % {
                    "time": time_str,
                    "user_display_name": user_display_name,
                }
            else:
                return _("at %(time)s") % {"time": time_str}
        else:
            if user_display_name:
                return _("%(time)s by %(user_display_name)s") % {
                    "time": time_str,
                    "user_display_name": user_display_name,
                }
            else:
                return time_str
    else:
        if use_shorthand:
            time_period = timesince(local_datetime, now=current_datetime).split(",")[0]
        else:
            time_period = timesince(local_datetime, now=current_datetime)

        if user_display_name:
            return _("%(time_period)s ago by %(user_display_name)s") % {
                "time_period": time_period,
                "user_display_name": user_display_name,
            }
        else:
            return _("%(time_period)s ago") % {"time_period": time_period}


@register.filter
def user_display_name(user):
    return get_user_display_name(user)


@register.filter
def format_content_type(content_type):
    return get_content_type_label(content_type)


@register.simple_tag
def i18n_enabled():
    return getattr(settings, "WAGTAIL_I18N_ENABLED", False)


@register.simple_tag
def locale_label_from_id(locale_id):
    """
    Returns the Locale display name given its id.
    """
    return get_locales_display_names().get(locale_id)


@register.simple_tag(takes_context=True)
def sidebar_collapsed(context):
    request = context.get("request")
    collapsed = request.COOKIES.get("wagtail_sidebar_collapsed", "0")
    if collapsed == "0":
        return False
    return True


@register.simple_tag(takes_context=True)
def sidebar_props(context):
    request = context["request"]
    search_areas = admin_search_areas.search_items_for_request(request)
    if search_areas:
        search_area = search_areas[0]
    else:
        search_area = None

    account_menu = [
        sidebar.LinkMenuItem(
            "account", _("Account"), reverse("wagtailadmin_account"), icon_name="user"
        ),
        sidebar.ActionMenuItem(
            "logout", _("Log out"), reverse("wagtailadmin_logout"), icon_name="logout"
        ),
    ]

    modules = [
        sidebar.WagtailBrandingModule(),
        sidebar.SearchModule(search_area) if search_area else None,
        sidebar.MainMenuModule(
            admin_menu.render_component(request), account_menu, request.user
        ),
    ]
    modules = [module for module in modules if module is not None]

    return json_script(
        {
            "modules": JSContext().pack(modules),
        },
        element_id="wagtail-sidebar-props",
    )


@register.simple_tag
def get_comments_enabled():
    return getattr(settings, "WAGTAILADMIN_COMMENTS_ENABLED", True)


@register.simple_tag(takes_context=True)
def wagtail_config(context):
    request = context["request"]
    config = {
        "CSRF_TOKEN": get_token(request),
        "CSRF_HEADER_NAME": HttpHeaders.parse_header_name(settings.CSRF_HEADER_NAME),
        "ADMIN_API": {
            "PAGES": reverse("wagtailadmin_api:pages:listing"),
            "DOCUMENTS": reverse("wagtailadmin_api:documents:listing"),
            "IMAGES": reverse("wagtailadmin_api:images:listing"),
            # Used to add an extra query string on all API requests. Example value: '&order=-id'
            "EXTRA_CHILDREN_PARAMETERS": "",
        },
        "ADMIN_URLS": {
            "DISMISSIBLES": reverse("wagtailadmin_dismissibles"),
            "PAGES": reverse("wagtailadmin_explore_root"),
            "BLOCK_PREVIEW": reverse("wagtailadmin_block_preview"),
        },
        "I18N_ENABLED": i18n_enabled(),
        "LOCALES": [
            {
                "code": locale.language_code,
                "display_name": force_str(locale.get_display_name()),
            }
            for locale in Locale.objects.all()
        ],
        "STRINGS": get_js_translation_strings(),
    }

    if locale := context.get("locale"):
        config["ACTIVE_CONTENT_LOCALE"] = locale.language_code

    user = getattr(context.get("request"), "user", None)

    config["KEYBOARD_SHORTCUTS_ENABLED"] = (
        user.wagtail_userprofile.keyboard_shortcuts
        if hasattr(user, "wagtail_userprofile")
        else True
    )

    return config


@register.simple_tag
def resolve_url(url):
    # Used by wagtailadmin/shared/pagination_nav.html - given an input that may be a URL route
    # name, or a direct URL path, return it as a direct URL path. On failure (or being passed
    # an empty / None value), return empty string
    if not url:
        return ""

    try:
        return resolve_url_func(url)
    except NoReverseMatch:
        return ""


class FragmentNode(template.Node):
    def __init__(self, nodelist, target_var, stripped=False):
        self.nodelist = nodelist
        self.target_var = target_var
        self.stripped = stripped

    def render(self, context):
        fragment = self.nodelist.render(context) if self.nodelist else ""
        # Only strip the leading and trailing spaces, unlike
        # {% blocktrans trimmed %} that also does line-by-line stripping.
        # Then, use mark_safe because the SafeString returned by
        # NodeList.render() is lost after stripping.
        if self.stripped:
            fragment = mark_safe(fragment.strip())
        context[self.target_var] = fragment
        return ""


@register.tag(name="fragment")
def fragment(parser, token):
    """
    Store a template fragment as a variable.

    Usage:

    .. code-block:: html+django

        {% fragment as header_title %}
            {% blocktrans trimmed %}Welcome to the {{ site_name }} Wagtail CMS{% endblocktrans %}
        {% endfragment %}
        {% include "my/custom/header.html" with title=header_title %}

    Adopted from `slippers' fragment template tag <https://mitchel.me/slippers/docs/template-tags-filters/#fragment>`_ with a few tweaks.

    To strip leading and trailing whitespace produced in the fragment, use the
    ``stripped`` option. This is useful if you need to check if the resulting
    fragment is empty (after leading and trailing spaces are removed):

    .. code-block:: html+django

        {% fragment stripped as recipient %}
            {{ title }} {{ first_name }} {{ last_name }}
        {% endfragment %}
        {% if recipient %}
            Recipient: {{ recipient }}
        {% endif %}

    Note that the stripped option only strips leading and trailing spaces, unlike
    ``{% blocktrans trimmed %}`` that also does line-by-line stripping. This is because
    the fragment may contain HTML tags that are sensitive to whitespace, such as
    ``<pre>`` and ``<code>``.
    """
    error_message = "The syntax for fragment is {% fragment as variable_name %}"

    try:
        tag_name, *options, target_var = token.split_contents()
        nodelist = parser.parse(("endfragment",))
        parser.delete_first_token()
    except ValueError as e:
        if settings.DEBUG:
            raise template.TemplateSyntaxError(error_message) from e
        return ""

    stripped = "stripped" in options

    return FragmentNode(nodelist, target_var, stripped=stripped)


class BlockInclusionNode(template.Node):
    """
    Create template-driven tags like Django’s inclusion_tag / InclusionNode, but for block-level tags.

    Usage:
        {% my_tag status="test" label="Alert" %}
            Proceed with caution.
        {% endmy_tag %}

    Within `my_tag`’s template, the template fragment will be accessible as the {{ children }} context variable
    (or other variable as specified by `content_var`).

    The output can also be stored as a variable in the parent context:

        {% my_tag status="test" label="Alert" as my_variable %}
            Proceed with caution.
        {% endmy_tag %}

    Inspired by slippers’ Component Node.
    See https://github.com/mixxorz/slippers/blob/254c720e6bb02eb46ae07d104863fce41d4d3164/slippers/templatetags/slippers.py#L47.
    """

    # Context variable into which the tag's rendered content will be placed
    content_var = "children"

    def __init__(self, nodelist, template, extra_context, target_var=None):
        self.nodelist = nodelist
        self.template = template
        self.extra_context = extra_context
        self.target_var = target_var

    def get_context_data(self, parent_context):
        return parent_context

    def render(self, context):
        children = self.nodelist.render(context) if self.nodelist else ""

        values = {
            # Resolve the tag’s parameters within the current context.
            key: value.resolve(context)
            for key, value in self.extra_context.items()
        }

        t = context.template.engine.get_template(self.template)
        # Add the `children` variable in the rendered template’s context.
        context_data = self.get_context_data({**values, self.content_var: children})
        output = t.render(Context(context_data, autoescape=context.autoescape))

        if self.target_var:
            context[self.target_var] = output
            return ""

        return output

    @classmethod
    def handle(cls, parser, token):
        tag_name, *remaining_bits = token.split_contents()

        nodelist = parser.parse((f"end{tag_name}",))
        parser.delete_first_token()

        extra_context = token_kwargs(remaining_bits, parser)

        # Allow component fragment to be assigned to a variable
        target_var = None
        if len(remaining_bits) >= 2 and remaining_bits[-2] == "as":
            target_var = remaining_bits[-1]

        return cls(nodelist, cls.template, extra_context, target_var)


class DialogNode(BlockInclusionNode):
    template = "wagtailadmin/shared/dialog/dialog.html"

    def get_context_data(self, parent_context):
        context = super().get_context_data(parent_context)

        if "title" not in context:
            raise TypeError("You must supply a title")
        if "id" not in context:
            raise TypeError("You must supply an id")

        # Used for determining which icon the message will use
        message_icon_name = {
            "info": "info-circle",
            "warning": "warning",
            "critical": "warning",
            "success": "circle-check",
        }

        message_status = context.get("message_status")

        # If there is a message status then determine which icon to use.
        if message_status:
            context["message_icon_name"] = message_icon_name[message_status]

        return context


register.tag("dialog", DialogNode.handle)


class HelpBlockNode(BlockInclusionNode):
    template = "wagtailadmin/shared/help_block.html"


register.tag("help_block", HelpBlockNode.handle)


class DropdownNode(BlockInclusionNode):
    template = "wagtailadmin/shared/dropdown/dropdown.html"


register.tag("dropdown", DropdownNode.handle)


class DropdownButtonNode(BlockInclusionNode):
    template = "wagtailadmin/shared/dropdown/dropdown_button.html"


register.tag("dropdown_button", DropdownButtonNode.handle)


class PanelNode(BlockInclusionNode):
    template = "wagtailadmin/shared/panel.html"


register.tag("panel", PanelNode.handle)


class RawFormattedFieldNode(BlockInclusionNode):
    content_var = "rendered_field"
    template = "wagtailadmin/shared/field.html"


register.tag("rawformattedfield", RawFormattedFieldNode.handle)


@register.inclusion_tag("wagtailadmin/shared/formatted_field.html")
def formattedfield(
    field=None,
    rendered_field=None,
    classname="",
    show_label=True,
    id_for_label=None,
    sr_only_label=False,
    icon=None,
    help_text=None,
    help_text_id=None,
    show_add_comment_button=False,
    label_text=None,
    error_message_id=None,
    wrapper_id=None,
    attrs=None,
):
    """
    Renders a form field in standard Wagtail admin layout.
    - `field` - The Django form field to render.
    - `rendered_field` - The rendered HTML of the field, to be used in preference to `field`.
    - `classname` - For legacy patterns requiring field-specific classes. Avoid if possible.
    - `show_label` - Hide the label if it is rendered outside of the field.
    - `id_for_label` - Manually set this this if the field’s HTML isn’t rendered by Django (for example hard-coded in HTML).
        We add an id to the label so we can use it as a descriptor for the "Add comment" button.
    - `sr_only_label` - Make the label invisible for all but screen reader users. Use this if the field is displayed without a label.
    - `icon` - Some fields have an icon, though this is generally a legacy pattern.
    - `help_text` - Manually set this if the field’s HTML is hard-coded.
    - `help_text_id` - The help text’s id, necessary so it can be attached to the field with `aria-describedby`.
    - `show_add_comment_button` - Display a comment control within Wagtail forms.
    - `label_text` - Manually set this if the field’s HTML is hard-coded.
    - `error_message_id` - ID of the error message container element.
    - `wrapper_id` - ID of the overall wrapper element.
    - `attrs` - Dict of additional HTML attributes to add to the field wrapper element, `data-field-wrapper` will be included by default.
    """

    label_for = id_for_label or (field and field.id_for_label) or ""

    context = {
        "classname": classname,
        # Ensure data-field-wrapper is always present
        "attrs": {**(attrs or {}), "data-field-wrapper": True},
        "show_label": show_label,
        "sr_only_label": sr_only_label,
        "icon": icon,
        "show_add_comment_button": show_add_comment_button,
        "error_message_id": error_message_id,
        "wrapper_id": wrapper_id,
        "label_for": label_for,
        "label_id": f"{label_for}-label" if label_for else "",
        "label_text": label_text or (field and field.label) or "",
        "required": field and field.field.required,
        "contentpath": field.name if field else "",
        "help_text": help_text or (field and field.help_text) or "",
    }

    if help_text_id:
        context["help_text_id"] = help_text_id
    elif field and field.help_text and field.id_for_label:
        context["help_text_id"] = f"{field.id_for_label}-helptext"
    else:
        context["help_text_id"] = ""

    if field:
        context["rendered_field"] = rendered_field or render_with_errors(field)
        context["field_classname"] = (
            f"w-field--{fieldtype(field)} w-field--{widgettype(field)}"
        )

        errors = field.errors
        has_errors = bool(errors)
        if has_errors and hasattr(field.field.widget, "render_with_errors"):
            # field handles its own error rendering, so don't output them here
            # (but still keep has_errors=True to keep the error styling)
            errors = []

        context["has_errors"] = has_errors
        context["errors"] = errors
    else:
        context["rendered_field"] = rendered_field
        context["field_classname"] = ""
        context["has_errors"] = False
        context["errors"] = []

    return context


@register.inclusion_tag("wagtailadmin/shared/formatted_field.html", takes_context=True)
def formattedfieldfromcontext(context):
    """
    Variant of formattedfield that takes its arguments from the template context. Used by the
    wagtailadmin/shared/field.html template.
    """
    kwargs = {}
    for arg in (
        "field",
        "rendered_field",
        "classname",
        "show_label",
        "id_for_label",
        "sr_only_label",
        "icon",
        "help_text",
        "help_text_id",
        "show_add_comment_button",
        "label_text",
        "error_message_id",
        "wrapper_id",
    ):
        if arg in context:
            kwargs[arg] = context[arg]
    return formattedfield(**kwargs)


class FieldRowNode(BlockInclusionNode):
    template = "wagtailadmin/shared/forms/field_row.html"


register.tag("field_row", FieldRowNode.handle)


# Button used to open dialogs
@register.inclusion_tag("wagtailadmin/shared/dialog/dialog_toggle.html")
def dialog_toggle(dialog_id, classname="", text=None):
    if not dialog_id:
        raise ValueError("You must supply the dialog ID")

    return {
        "classname": classname,
        "text": text,
        # dialog_id must match the ID of the dialog you are toggling
        "dialog_id": dialog_id,
    }


@register.simple_tag()
def workflow_status_with_date(workflow_state):
    translation_context = {
        "finished_at": naturaltime(workflow_state.current_task_state.finished_at),
        "started_at": naturaltime(workflow_state.current_task_state.started_at),
        "task_name": workflow_state.current_task_state.task.name,
        "status_display": workflow_state.get_status_display,
    }

    if workflow_state.status == "needs_changes":
        return _("Changes requested %(finished_at)s") % translation_context

    if workflow_state.status == "in_progress":
        return _("Sent to %(task_name)s %(started_at)s") % translation_context

    return _("%(status_display)s %(task_name)s %(started_at)s") % translation_context


@register.inclusion_tag(
    "wagtailadmin/shared/keyboard_shortcuts_dialog.html",
    takes_context=True,
)
def keyboard_shortcuts_dialog(context):
    """
    Renders the keyboard shortcuts dialog content with the
    appropriate shortcuts for the user's platform.
    Note: Shortcut keys are intentionally not translated.
    """
    request = context.get("request")
    keyboard_shortcuts_enabled = True

    if request and getattr(request, "user", None):
        profile = getattr(request.user, "wagtail_userprofile", None)
        if profile is not None:
            keyboard_shortcuts_enabled = bool(
                getattr(profile, "keyboard_shortcuts", True)
            )

    comments_enabled = get_comments_enabled()
    user_agent = request.headers.get("User-Agent", "") if request else ""
    is_mac = re.search(r"Mac|iPod|iPhone|iPad", user_agent)
    KEYS = get_keyboard_key_labels_from_request(request) if request else {}

    return {
        "keyboard_shortcuts_enabled": keyboard_shortcuts_enabled,
        "shortcuts": {
            # Translators: Shortcuts for admin common shortcuts that are available across the admin
            ("admin-common", _("Application")): [
                (_("Show keyboard shortcuts"), "?"),
                (_("Search"), "/"),
                (_("Toggle sidebar"), "["),
                (_("Toggle minimap"), "]"),
                (_("Close modal dialogs (like this one)"), f"{KEYS.ESC}"),
            ],
            # Translators: Shortcuts for admin actions that can be taken while working on core models
            ("admin-core-models", _("Actions")): [
                (_("Save changes"), f"{KEYS.MOD} + s"),
                (_("Preview"), f"{KEYS.MOD} + p"),
                (_("Add or show comments"), f"{KEYS.CTRL} + {KEYS.ALT} + m")
                if comments_enabled
                else None,
            ],
            # Translators: Shortcuts for common text editing features available in all fields (even if not a rich text field)
            ("text-editing-basic", _("Text editing")): [
                (_("Copy"), f"{KEYS.MOD} + c"),
                (_("Cut"), f"{KEYS.MOD} + x"),
                (_("Paste"), f"{KEYS.MOD} + v"),
                (
                    _("Paste and match style")
                    if is_mac
                    else _("Paste without formatting"),
                    f"{KEYS.MOD} + {KEYS.SHIFT} + v",
                ),
                (_("Undo"), f"{KEYS.MOD} + z"),
                (
                    _("Redo"),
                    f"{KEYS.MOD} + {KEYS.SHIFT} + z" if is_mac else f"{KEYS.MOD} + y",
                ),
            ],
            # Translators: Shortcuts for formatting & editing features available in rich text fields
            ("text-editing-rich-text", _("Text formatting")): [
                (_("Insert or edit a link"), f"{KEYS.MOD} + k"),
                (_("Bold"), f"{KEYS.MOD} + b"),
                (_("Italic"), f"{KEYS.MOD} + i"),
                (_("Monospace (code)"), f"{KEYS.MOD} + j"),
                (_("Strike-through"), f"{KEYS.MOD} + {KEYS.SHIFT} + x"),
                (_("Superscript"), f"{KEYS.MOD} + ."),
                (_("Subscript"), f"{KEYS.MOD} + ,"),
            ],
        },
    }


@register.inclusion_tag("wagtailadmin/shared/human_readable_date.html")
def human_readable_date(date, description=None, placement="top"):
    if isinstance(date, datetime.datetime):
        tooltip_format = get_format("DATETIME_FORMAT") or "N j, Y, P"
    elif isinstance(date, datetime.date):
        tooltip_format = get_format("DATE_FORMAT") or "N j, Y"
    return {
        "date": date,
        "description": description,
        "placement": placement,
        "tooltip_format": tooltip_format,
    }


# Shadow the laces `component` tag which was extracted from Wagtail. The shadowing
# is useful to avoid having to update all the templates that use the `component` tag.
register.tag("component", component)


register.simple_tag(get_icon_sprite_url, name="icon_sprite_url")
