import json
import random
from functools import lru_cache

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

# Unfold Imports
from unfold.sites import UnfoldAdminSite

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

def is_dovoodi_panel(request):
    """
    Returns True if the user is accessing the Dovoodi admin panel.
    Checks if '/dovoodi/' exists anywhere in the path to handle i18n prefixes 
    (e.g., /en/dovoodi/admin, /fa/dovoodi/admin).
    """
    return '/dovoodi/' in request.path

def is_main_panel(request):
    """Returns True if the user is accessing the Main (Imam Javad) admin panel."""
    return not is_dovoodi_panel(request)

def admin_url_generator(request, url_name):
    """
    Dynamically generates admin URLs based on the current active panel.
    Usage in settings.py: lambda request: admin_url_generator(request, "app_model_changelist")
    """
    # Ensure admin sites are created and URLs are registered
    _ = project_admin_site.urls  # Access URLs to ensure site is created
    _ = dovoodi_admin_site.urls  # Access URLs to ensure site is created

    # 1. Determine the current namespace
    if is_dovoodi_panel(request):
        namespace = 'dovoodi_admin'
    else:
        namespace = 'imam_javad_admin'

    # 2. Construct the view name
    full_view_name = f"{namespace}:{url_name}"

    # 3. Try Django URL reversal
    try:
        return reverse(full_view_name)
    except Exception:
        return "#"

def dashboard_callback(request, context):
    context.update(random_data())
    return context

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

# Toggle sidebar view for Unfold compatibility
@require_POST
def toggle_sidebar(request):
    """Toggle sidebar state for Unfold admin interface"""
    # This is a simple view that just returns success
    # The actual sidebar state is handled client-side
    return JsonResponse({'status': 'success'})

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

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

    @staticmethod
    def get_form():
        # Import AuthenticationForm only when needed
        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)
                # Change the label of the username field to "Email"
                self.fields["username"].label = "Email"

        return CustomLoginForm

# ---------------------------------------------------------
#  3. Admin Site Definitions
# ---------------------------------------------------------

class FormulaAdminSite(UnfoldAdminSite):
    """Main Admin for Imam Jawad"""
    site_header = "Imam Jawad Admin"
    site_title = "Imam Jawad Admin"
    index_title = "System Administration"
    site_subheader = "Imam Jawad School"

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        # Set login form after initialization to avoid circular import
        self.login_form = LoginForm.get_form()

    def get_form(self, request, obj=None, **kwargs):
        """Override to ensure form is properly initialized"""
        form = super().get_form(request, obj, **kwargs)
        return 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):
        """Override colors for Imam Javad admin panel with green theme"""
        from unfold.utils import hex_to_rgb
        
        if key != "COLORS":
            return super()._get_colors(key, *args)
        
        # پالت رنگی سبز برای امام جواد
        imam_javad_colors = {
            "base": {
                "50": "249 250 251",
                "100": "243 244 246",
                "200": "229 231 235",
                "300": "209 213 219",
                "400": "156 163 175",
                "500": "107 114 128",
                "600": "75 85 99",
                "700": "55 65 81",
                "800": "31 41 55",
                "900": "17 24 39",
                "950": "3 7 18",
            },
            "primary": {
                "50": "234 253 243",
                "100": "208 251 232",
                "200": "167 247 216",
                "300": "110 240 189",
                "400": "37 213 152",
                "500": "37 208 118",  # #25D076 - سبز اصلی
                "600": "29 166 94",
                "700": "25 136 80",
                "800": "22 108 66",
                "900": "20 89 57",
                "950": "10 53 34",
            },
            "secondary": {
                "50": "240 253 250",
                "100": "204 251 241",
                "200": "153 246 228",
                "300": "94 234 212",
                "400": "45 212 191",
                "500": "1 53 59",  # #01353B - پس‌زمینه تیره
                "600": "1 43 48",
                "700": "1 36 40",
                "800": "1 30 34",
                "900": "0 26 29",
                "950": "0 13 15",
            },
            "font": {
                "subtle-light": "var(--color-base-500)",
                "subtle-dark": "var(--color-base-400)",
                "default-light": "var(--color-secondary-500)",
                "default-dark": "var(--color-base-300)",
                "important-light": "var(--color-base-900)",
                "important-dark": "255 255 255",
            },
        }
        
        return imam_javad_colors

class DovoodiAdminSite(UnfoldAdminSite):
    """Secondary Admin for Dovoodi"""
    site_header = "Dovoodi Admin"
    site_title = "Dovoodi Admin"
    index_title = "System Administration"
    site_subheader = "Dovodbi Application"

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        # Set login form after initialization to avoid circular import
        self.login_form = LoginForm.get_form()

    def get_form(self, request, obj=None, **kwargs):
        """Override to ensure form is properly initialized"""
        form = super().get_form(request, obj, **kwargs)
        return 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):
        """Override colors for Dovoodi admin panel with blue/teal theme matching frontend"""
        from unfold.utils import hex_to_rgb
        
        if key != "COLORS":
            return super()._get_colors(key, *args)
        
        # پالت رنگی آبی-تیره برای داوودی (مطابق با فرانت)
        dovoodi_colors = {
            "base": {
                # استفاده از Wormy scale برای base
                "50": "252 251 250",   # #FCFBFA
                "100": "246 245 244",  # #F6F5F4
                "200": "240 236 233",  # #F0ECE9
                "300": "229 220 211",  # #E5DCD3
                "400": "191 174 157",  # #BFAE9D
                "500": "107 114 128",
                "600": "75 85 99",
                "700": "55 65 81",
                "800": "31 41 55",
                "900": "17 24 39",     # #111827
                "950": "3 7 18",
            },
            "primary": {
                # استفاده از رنگ آبی اصلی فرانت
                "50": "240 244 255",   # #F0F4FF
                "100": "224 231 255",  # #E0E7FF
                "200": "199 210 254",  # #C7D2FE
                "300": "165 180 252",  # #A5B4FC
                "400": "129 140 248",  # #818CF8
                "500": "99 102 241",   # #6366F1
                "600": "81 114 225",   # #5172E1 - رنگ اصلی فرانت
                "700": "59 89 196",    # #3B59C4
                "800": "45 68 145",    # #2D4491
                "900": "30 41 91",
                "950": "15 20 45",
            },
            "secondary": {
                # استفاده از Second scale فرانت (تیره سبز-آبی)
                "50": "210 215 215",   # #D2D7D7
                "100": "151 163 164",  # #97A3A4
                "200": "108 125 127",  # #6C7D7F
                "300": "44 69 72",     # #2C4548
                "400": "1 31 34",      # #011F22
                "500": "1 22 24",      # #011618 - پس‌زمینه اصلی
                "600": "1 19 21",      # #011315
                "700": "0 15 17",
                "800": "0 12 14",
                "900": "0 8 10",
                "950": "0 4 5",
            },
            "font": {
                "subtle-light": "var(--color-base-500)",
                "subtle-dark": "var(--color-base-400)",
                "default-light": "var(--color-secondary-400)",
                "default-dark": "var(--color-base-200)",
                "important-light": "var(--color-base-900)",
                "important-dark": "255 255 255",
            },
        }
        
        return dovoodi_colors

# Simple admin site placeholders that will be replaced after Django setup
class AdminSitePlaceholder(UnfoldAdminSite):
    """Placeholder that behaves like an admin site until Django is fully loaded"""

    def __init__(self, site_class, name):
        # 1. Store config for lazy loading
        self._site_class = site_class
        self._name = name
        self._real_instance = None
        self._registry = {}  # Store registrations until real instance is created

        # 2. THE FIX: Copy visual attributes immediately so Templates see them!
        self.site_header = getattr(site_class, 'site_header', 'Django Admin')
        self.site_title = getattr(site_class, 'site_title', 'Django Site')
        self.index_title = getattr(site_class, 'index_title', 'Site Administration')
        self.site_subheader = getattr(site_class, 'site_subheader', '')

    def _get_real_instance(self):
        if self._real_instance is None:
            # Force creation of real admin site instance for proper CSS loading
            self._real_instance = self._site_class(name=self._name)
            # Copy critical attributes immediately for template access
            self.login_form = self._real_instance.login_form
            self.login_template = self._real_instance.login_template
            # Copy any other attributes that templates might need
            for attr in ['site_header', 'site_title', 'index_title', 'site_subheader']:
                if hasattr(self._real_instance, attr):
                    setattr(self, attr, getattr(self._real_instance, attr))

            # Copy any existing registrations from the placeholder to the real instance
            if hasattr(self, '_registry'):
                for model, admin_class in self._registry.items():
                    self._real_instance.register(model, admin_class)

            # Replace the global reference with the real instance
            import sys
            current_module = sys.modules[__name__]
            if hasattr(current_module, self._name):
                setattr(current_module, self._name, self._real_instance)

        return self._real_instance

    def __getattr__(self, name):
        # Delegate all attribute access to the real instance for proper CSS and template loading
        return getattr(self._get_real_instance(), name)

    def get_form(self, request, obj=None, **kwargs):
        """Delegate get_form to the real admin site instance"""
        return self._get_real_instance().get_form(request, obj, **kwargs)

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

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

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

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

    def register(self, model_or_iterable, admin_class=None, **options):
        """Store registrations in placeholder until real instance is created"""
        if isinstance(model_or_iterable, (list, tuple)):
            for model in model_or_iterable:
                self.register(model, admin_class, **options)
        else:
            model = model_or_iterable
            if model in self._registry:
                # If already registered, update the admin class
                self._registry[model] = admin_class
            else:
                self._registry[model] = admin_class

            # Also register with the real instance if it exists
            if self._real_instance is not None:
                self._real_instance.register(model, admin_class, **options)

# Create lazy-loading admin site instances that properly inherit from AdminSite
class LazyAdminSite(UnfoldAdminSite):
    def __init__(self, site_class, name):
        # Don't call super().__init__() to avoid creating the real instance yet
        self._site_class = site_class
        self._name = name
        self._instance = None
        # Set basic attributes that Django expects for isinstance checks
        self.name = name

    def _force_init(self):
        """Force initialization immediately"""
        if self._instance is None:
            self._instance = self._site_class(name=self._name)
            # Copy all attributes to this instance
            for attr in dir(self._instance):
                if not attr.startswith('_') and attr not in ('register', 'unregister', 'is_registered'):
                    try:
                        setattr(self, attr, getattr(self._instance, attr))
                    except (AttributeError, TypeError):
                        pass
    def _ensure_instance(self):
        """Ensure the real instance exists"""
        if self._instance is None:
            self._instance = self._site_class(name=self._name)
            # Copy essential attributes to this lazy wrapper for compatibility
            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):
        """Ensure URLs are accessed to create the instance"""
        return self._get_instance().urls

    def get_urls(self):
        """Delegate get_urls to ensure proper URL registration"""
        return self._get_instance().get_urls()

    def register(self, model_or_iterable, admin_class=None, **options):
        """Register models with the real admin site instance"""
        self._ensure_instance()
        return self._instance.register(model_or_iterable, admin_class, **options)

# Create lazy admin site instances
project_admin_site = LazyAdminSite(FormulaAdminSite, 'imam_javad_admin')
dovoodi_admin_site = LazyAdminSite(DovoodiAdminSite, 'dovoodi_admin')

# from django.contrib.admin.sites import AdminSite

# class LazyAdminSite(AdminSite):
#     """Lazy wrapper that initializes the real admin site on first access"""
    
#     def __init__(self, site_class, name):
#         # Don't call super().__init__() - avoid app registry checks at import time
#         self._site_class = site_class
#         self._name = name
#         self._instance = None
    
#     def _get_instance(self):
#         """Initialize the real site on first access (after Django is ready)"""
#         if self._instance is None:
#             self._instance = self._site_class(name=self._name)
#         return self._instance
    
#     def __getattr__(self, name):
#         """Delegate all attribute access to the real instance"""
#         if name.startswith('_'):
#             raise AttributeError(f"'{type(self).__name__}' object has no attribute '{name}'")
#         return getattr(self._get_instance(), name)
    
#     @property
#     def urls(self):
#         """Required for Django URL routing"""
#         return self._get_instance().urls
    
#     @property
#     def media(self):
#         """Expose the media from the real admin instance"""
#         return self._get_instance().media
    
#     @property
#     def form_class(self):
#         """Expose form class"""
#         return self._get_instance().form_class
    
#     def has_permission(self, request):
#         """Check if user has admin permission"""
#         return self._get_instance().has_permission(request)
    
#     def each_context(self, request):
#         """Return context for admin templates"""
#         return self._get_instance().each_context(request)
    
#     def get_urls(self):
#         """Get admin URLs"""
#         return self._get_instance().get_urls()
    
#     def register(self, model, admin_class=None, **options):
#         """Register a model with the admin site"""
#         return self._get_instance().register(model, admin_class, **options)


# # Create lazy instances (NO initialization at import time!)
# project_admin_site = LazyAdminSite(FormulaAdminSite, 'imam_javad_admin')
# dovoodi_admin_site = LazyAdminSite(DovoodiAdminSite, 'dovoodi_admin')

# Function to replace placeholders with real instances when Django is ready
def replace_placeholders_with_real_sites():
    global project_admin_site, dovoodi_admin_site
    if isinstance(project_admin_site, AdminSitePlaceholder):
        project_admin_site = FormulaAdminSite(name='imam_javad_admin')
    if isinstance(dovoodi_admin_site, AdminSitePlaceholder):
        dovoodi_admin_site = DovoodiAdminSite(name='dovoodi_admin')

# The placeholders will be replaced with real instances when first accessed
# This ensures proper CSS loading for admin templates

class HomeView(RedirectView):
    def get_redirect_url(self, *args, **kwargs):
        host = self.request.get_host()
        
        # دریافت زبان فعلی (پیش‌فرض: en)
        language = get_language() or 'en'
        
        # دامنه‌های داوودی
        dovoodi_domains = ['dovodi.newhorizonco.uk', 'dovoodi.newhorizonco.uk']
        
        # تصمیم‌گیری بر اساس دامنه و برگرداندن URL با prefix زبانی
        if any(domain in host for domain in dovoodi_domains):
            return f'/{language}/dovoodi/admin/'
        else:
            return f'/{language}/imam-javad/admin/'

# ---------------------------------------------------------
#  4. Dummy Data for Dashboard Charts
# ---------------------------------------------------------

@lru_cache
def random_data():
    WEEKDAYS = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]
    
    # Generate some fake data
    positive = [[1, random.randrange(8, 28)] for i in range(1, 28)]
    negative = [[-1, -random.randrange(8, 28)] for i in range(1, 28)]
    average = [r[1] - random.randint(3, 5) for r in positive]
    performance_positive = [[1, random.randrange(8, 28)] for i in range(1, 28)]
    performance_negative = [[-1, -random.randrange(8, 28)] for i in range(1, 28)]

    return {
        "navigation": [
            {"title": _("Dashboard"), "link": "/", "active": True},
            {"title": _("Analytics"), "link": "#"},
            {"title": _("Settings"), "link": "#"},
        ],
        "kpi": [
            {
                "title": "Total Revenue",
                "metric": f"${intcomma(f'{random.uniform(1000, 9999):.02f}')}",
                "footer": mark_safe(f'<strong class="text-green-700 font-semibold dark:text-green-400">+{intcomma(f"{random.uniform(1, 9):.02f}")}%</strong>&nbsp;progress'),
                "chart": json.dumps({"labels": [WEEKDAYS[day % 7] for day in range(1, 28)], "datasets": [{"data": average, "borderColor": "#9333ea"}]}),
            },
        ],
        "chart": json.dumps({
            "labels": [WEEKDAYS[day % 7] for day in range(1, 28)],
            "datasets": [
                {"label": "Revenue", "data": positive, "backgroundColor": "var(--color-primary-700)"},
            ],
        }),
    }