from django import forms
from django.contrib import admin
from django.contrib.auth.admin import UserAdmin as BaseUserAdmin
from django.contrib.auth.admin import GroupAdmin as BaseGroupAdmin
from django.contrib.auth.models import Group
from django.db import models
from django.utils.html import format_html
from django.utils.translation import gettext_lazy as _, ngettext
from django.templatetags.static import static

from rest_framework.authtoken.models import TokenProxy
from unfold.admin import ModelAdmin, StackedInline
from unfold.contrib.forms.widgets import WysiwygWidget
from unfold.decorators import display
from unfold.forms import AdminPasswordChangeForm, UserChangeForm, UserCreationForm
from unfold.sections import TableSection
from unfold.contrib.filters.admin import RangeDateTimeFilter

# Import Models
from apps.account.models import User, ClientUser, StudentUser, ProfessorUser, LocationHistory

# Import Admin Sites from utils
from utils.admin import project_admin_site, dovoodi_admin_site , is_dovoodi_panel
from apps.account.admin.location import LocationHistoryInline
from unfold.widgets import UnfoldAdminSelectWidget

# =========================================================
#  1. Base User Admin (Logic Shared by all User types)
# =========================================================

class UserAdminCreationForm(UserCreationForm):
    class Meta(UserCreationForm.Meta):
        model = User
        fields = ("fullname", "email")

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        if 'fullname' in self.fields:
            self.fields['fullname'].required = True
        if 'email' in self.fields:
            self.fields['email'].required = True

    def clean_email(self):
        email = self.cleaned_data.get('email')
        if User.objects.filter(email=email).exists():
            raise forms.ValidationError(_("A user with this email already exists."))
        return email

class UserAdminChangeForm(UserChangeForm):
    class Meta(UserChangeForm.Meta):
        model = User

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        if 'fullname' in self.fields:
            self.fields['fullname'].required = True
        if 'email' in self.fields:
            self.fields['email'].required = True

class UserAdmin(ModelAdmin, BaseUserAdmin):
    form = UserAdminChangeForm
    add_form = UserAdminCreationForm
    change_password_form = AdminPasswordChangeForm
    compressed_fields = False
    list_before_template = "account/user_list_section.html"
    list_display = ('fullname', 'email', 'is_active', 'display_date_joined',)
    ordering = ("-id",)
    search_fields = ('email', 'fullname', 'username',)
    list_filter = [
        "is_active",
        "is_staff",
        ("last_login", RangeDateTimeFilter),
        ("date_joined", RangeDateTimeFilter),
    ]
    inlines = [LocationHistoryInline]
    
    add_fieldsets = (
        (None, {
            'classes': ('wide',),
            'fields': (('fullname', 'email'), 'phone_number', 'birthdate', 'gender', 'avatar', 'skill', 'info'),
        }),
        (_('Location'), {
            'fields': ('city', 'country'),
            'classes': ('collapse',),
        }),
        (_('Password'), {
            'fields': ('password1', 'password2'),
            'classes': ('collapse',),
        }),
        (_('Permissions'), {
            'fields': ('is_active', 'is_staff', 'is_superuser', 'groups'),
            'classes': ('collapse',),
        }),
    )

    fieldsets = (
        (None, {"fields": ("email", "fullname")}),
        (_("Basic Information"), {
            "fields": ("gender", "avatar", "phone_number", "birthdate", 'info', 'skill', "password"),
            "classes": ["tab"],
        }),
        (_('Country & City'), {
            'fields': ('city', 'country'),
            "classes": ["tab"],
        }),
        (_('Device Information'), {
            'fields': ('device_id', 'device_os', 'fcm', 'language',),
            "classes": ["tab"],
        }),
        (_('Authentication'), {
            'fields': ('display_auth_token',),
            "classes": ["tab"],
        }),
        (_('Permissions'), {
            'fields': ('user_type', 'is_active', 'is_staff', 'groups'),
            "classes": ["tab"],
        }),
        (_('Important dates'), {
            'fields': ('last_login', 'date_joined', 'deleted_at'),
            "classes": ["tab"],
        }),
    )

    formfield_overrides = {
        models.TextField: {"widget": WysiwygWidget}
    }
    radio_fields = {"gender": admin.HORIZONTAL}
    readonly_fields = ["last_login", "date_joined", "display_auth_token"]

    def get_fieldsets(self, request, obj=None):
        # UserAdmin.get_fieldsets returns add_fieldsets when obj is None
        fieldsets = super().get_fieldsets(request, obj)
        if is_dovoodi_panel(request):
            new_fieldsets = []
            for name, options in fieldsets:
                # Hide entire Permissions section
                if name == _('Permissions'):
                    continue
                
                new_options = options.copy()
                # Hide skill field inside "Basic Information" (Edit) or the titleless section (Add)
                if name == _("Basic Information") or name is None:
                    fields = list(new_options.get("fields", []))
                    new_fields = []
                    for f in fields:
                        if isinstance(f, (list, tuple)):
                            inner_f = [inner for inner in f if inner != 'skill']
                            if inner_f:
                                new_fields.append(tuple(inner_f))
                        elif f != 'skill':
                            new_fields.append(f)
                    new_options["fields"] = tuple(new_fields)
                
                new_fieldsets.append((name, new_options))
            return tuple(new_fieldsets)
        return fieldsets

    @display(description=_("Date Joined"))
    def display_date_joined(self, instance: User):
        return instance.date_joined.strftime("%Y-%m-%d %H:%M") if instance.date_joined else "-"

    @display(description=_("Last Login"))
    def display_last_login(self, instance: User):
        return instance.last_login.strftime("%Y-%m-%d %H:%M") if instance.last_login else "-"
        
    @display(description=_("Authentication Token"))
    def display_auth_token(self, instance: User):
        from rest_framework.authtoken.models import Token
        try:
            token, created = Token.objects.get_or_create(user=instance)
            return format_html('<code style="word-break: break-all;">{}</code>', token.key)
        except Exception as e:
            return format_html('<span class="error">{}</span>', str(e))
            
    def get_queryset(self, request):
        qs = super().get_queryset(request)
        return qs.filter(email__isnull=False)

# =========================================================
#  2. Specific User Type Admins
# =========================================================

class GuestUserAdmin(UserAdmin):
    list_display = ('device_id', 'device_os', 'is_active', 'display_date_joined',)
    
    def has_add_permission(self, request):
        if '_popup' in request.GET and request.GET['_popup'] == '1':  
            return True
        return False

    def get_queryset(self, request):
        qs = super().get_queryset(request)
        return qs.filter(email__isnull=True)
    
    @display(description=_("Date Joined"))
    def display_date_joined(self, instance: User):
        return instance.date_joined.strftime("%Y-%m-%d %H:%M") if instance.date_joined else "-"



class GroupAdmin(BaseGroupAdmin, ModelAdmin):
    list_display = ('name', 'permissions_count')
    search_fields = ('name',)
    ordering = ('name',)
    filter_horizontal = ('permissions',)

    fieldsets = (
        (None, {'fields': ('name',)}),
        (_('Permissions'), {'fields': ('permissions',), 'classes': ['tab']}),
    )

    @display(description=_("Permissions"))
    def permissions_count(self, obj):
        count = obj.permissions.count()
        return ngettext("{count} permission", "{count} permissions", count).format(count=count) if count > 0 else "-"


# =========================================================
#  3. Registrations (SAFE METHOD)
# =========================================================

# A. DEFAULT DJANGO ADMIN (SAFE REGISTRATION)
# This is required because plugins like 'django-filer' expect User to be registered here.
try:
    admin.site.unregister(User)
except admin.sites.NotRegistered:
    pass

try:
    admin.site.register(User, UserAdmin)
except admin.sites.AlreadyRegistered:
    pass

# B. PROJECT ADMIN SITE (Imam Javad)
project_admin_site.register(User, UserAdmin)
project_admin_site.register(ClientUser, GuestUserAdmin)
project_admin_site.register(Group, GroupAdmin)

# C. DOVOODI ADMIN SITE
dovoodi_admin_site.register(User, UserAdmin)
dovoodi_admin_site.register(ClientUser, GuestUserAdmin)
dovoodi_admin_site.register(Group, GroupAdmin)

# D. Unregister TokenProxy safely (Cleaner UI)
try:
    admin.site.unregister(TokenProxy)
except admin.sites.NotRegistered:
    pass