import json
from django import forms
from django.conf import settings
from django.contrib.humanize.templatetags.humanize import intcomma
from django.urls import reverse, path
from django.utils.safestring import mark_safe
from django.utils.translation import gettext_lazy as _
from django.views.generic import RedirectView
from django.utils.translation import get_language
from django.http import JsonResponse
from django.views.decorators.http import require_POST

# --- Unicode slugify override for Unfold tabs ---
import django.utils.text
from django.template.defaultfilters import register

_original_slugify = django.utils.text.slugify

def _unicode_slugify(value, allow_unicode=True):
    return _original_slugify(value, allow_unicode=True)

django.utils.text.slugify = _unicode_slugify

@register.filter(is_safe=True)
def slugify(value):
    return _unicode_slugify(value)

# Unfold Imports
from unfold.sites import UnfoldAdminSite


# ---------------------------------------------------------
#  1. Helper Functions
# ---------------------------------------------------------

def admin_url_generator(request, url_name):
    """
    Dynamically generates admin URLs for the active admin site namespace.
    """
    namespace = 'admin'
    full_view_name = f"{namespace}:{url_name}"
    try:
        return reverse(full_view_name)
    except Exception:
        return "#"

def variables(request):
    return {"plausible_domain": getattr(settings, 'PLAUSIBLE_DOMAIN', '')}

@require_POST
def toggle_sidebar(request):
    """Toggle sidebar state for Unfold admin interface"""
    return JsonResponse({'status': 'success'})


# ---------------------------------------------------------
#  2. Custom Login Form
# ---------------------------------------------------------

class LoginForm:
    """Lazy login form to avoid circular imports during settings loading"""

    @staticmethod
    def get_form():
        from unfold.forms import AuthenticationForm

        class CustomLoginForm(AuthenticationForm):
            password = forms.CharField(widget=forms.PasswordInput(render_value=True))

            def __init__(self, request=None, *args, **kwargs):
                super().__init__(request, *args, **kwargs)
                self.fields["username"].label = _("Email")

        return CustomLoginForm


# ---------------------------------------------------------
#  3. Unified Admin Site Definition
# ---------------------------------------------------------

class AppAdminSite(UnfoldAdminSite):
    """Unified Modern Admin Site with Unfold Theme"""
    site_header = _("Management Dashboard")
    site_title = _("Admin Portal")
    index_title = _("System Administration")
    site_subheader = _("Application Console")

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.login_form = LoginForm.get_form()

    def get_urls(self):
        urls = super().get_urls()
        custom_urls = [
            path('toggle_sidebar/', toggle_sidebar, name='toggle_sidebar'),
        ]
        return custom_urls + urls
    
    def _get_colors(self, key, *args):
        if key != "COLORS":
            return super()._get_colors(key, *args)
        
        # Modern, sleek slate-indigo color palette
        return {
            "base": {
                "50": "248 250 252",
                "100": "241 245 249",
                "200": "226 232 240",
                "300": "203 213 225",
                "400": "148 163 184",
                "500": "100 116 139",
                "600": "71 85 105",
                "700": "51 65 85",
                "800": "30 41 59",
                "900": "15 23 42",
                "950": "2 6 23",
            },
            "primary": {
                "50": "238 242 255",
                "100": "224 231 255",
                "200": "199 210 254",
                "300": "165 180 252",
                "400": "129 140 248",
                "500": "99 102 241",
                "600": "79 70 229",
                "700": "67 56 202",
                "800": "55 48 163",
                "900": "49 46 129",
                "950": "30 27 75",
            },
            "font": {
                "subtle-light": "var(--color-base-500)",
                "subtle-dark": "var(--color-base-400)",
                "default-light": "var(--color-base-700)",
                "default-dark": "var(--color-base-200)",
                "important-light": "var(--color-base-900)",
                "important-dark": "255 255 255",
            },
        }


class LazyAdminSite(UnfoldAdminSite):
    def __init__(self, site_class, name):
        self._site_class = site_class
        self._name = name
        self._instance = None
        self.name = name

    def _ensure_instance(self):
        if self._instance is None:
            self._instance = self._site_class(name=self._name)
            essential_attrs = ['site_header', 'site_title', 'index_title', 'site_url', 'login_template']
            for attr in essential_attrs:
                if hasattr(self._instance, attr):
                    setattr(self, attr, getattr(self._instance, attr))

    def _get_instance(self):
        self._ensure_instance()
        return self._instance

    def __getattr__(self, name):
        self._ensure_instance()
        return getattr(self._instance, name)

    def __call__(self, *args, **kwargs):
        return self._get_instance()(*args, **kwargs)

    @property
    def urls(self):
        return self._get_instance().urls

    def get_urls(self):
        return self._get_instance().get_urls()

    def each_context(self, request):
        return self._get_instance().each_context(request)

    def register(self, model_or_iterable, admin_class=None, **options):
        self._ensure_instance()
        return self._instance.register(model_or_iterable, admin_class, **options)


# Singleton instances
project_admin_site = LazyAdminSite(AppAdminSite, 'admin')
# Compatibility alias
dovoodi_admin_site = project_admin_site


class HomeView(RedirectView):
    def get_redirect_url(self, *args, **kwargs):
        language = get_language() or 'en'
        return f'/{language}/admin/'


# ---------------------------------------------------------
#  4. Dynamic Custom Dashboard
# ---------------------------------------------------------

def dashboard_callback(request, context):
    """Generic Dashboard KPI statistics"""
    from django.apps import apps

    if context is None:
        context = {}

    context.update({
        "navigation": [{"title": _("Dashboard"), "link": "/admin/", "active": True}],
        "kpi": [],
    })

    if not hasattr(request, "user") or not request.user.is_authenticated:
        return context

    try:
        User = apps.get_model('account', 'User')
        LoginHistory = apps.get_model('account', 'LoginHistory')

        total_users = User.objects.count()
        active_users = User.objects.filter(is_active=True).count()
        staff_users = User.objects.filter(is_staff=True).count()
        total_logins = LoginHistory.objects.count()

        context["kpi"] = [
            {"title": _("Total Users"), "metric": f"{total_users:,}"},
            {"title": _("Active Users"), "metric": f"{active_users:,}"},
            {"title": _("Staff Members"), "metric": f"{staff_users:,}"},
            {"title": _("Total Logins"), "metric": f"{total_logins:,}"},
        ]
    except Exception as e:
        pass

    return context