Admin Integration

class TranslationAdmin(admin.ModelAdmin):
    """
    ModelAdmin subclass with automatic translation support.
    
    Automatically handles:
    - Language-specific field grouping
    - Translation field widgets
    - Prepopulated fields for translations
    - Required field validation per language
    """

class TranslationBaseModelAdmin:
    """
    Base admin mixin providing translation functionality.
    Can be used with custom admin classes.
    """

from django.contrib import admin
from modeltranslation.admin import TranslationAdmin
from .models import Article

@admin.register(Article)
class ArticleAdmin(TranslationAdmin):
    list_display = ('title', 'author', 'created_at')
    list_filter = ('author', 'created_at')
    search_fields = ('title', 'content')
    prepopulated_fields = {'slug': ('title',)}  # Works with translations

class TranslationTabularInline(admin.TabularInline):
    """
    TabularInline with translation support.
    Displays related translations in tabular format.
    """

class TranslationStackedInline(admin.StackedInline):
    """
    StackedInline with translation support.
    Displays related translations in stacked format.
    """

from modeltranslation.admin import TranslationAdmin, TranslationTabularInline

class CommentInline(TranslationTabularInline):
    model = Comment
    extra = 1
    fields = ('content', 'author')

@admin.register(Article)
class ArticleAdmin(TranslationAdmin):
    inlines = [CommentInline]

class TranslationGenericTabularInline(GenericTabularInline):
    """GenericTabularInline with translation support."""

class TranslationGenericStackedInline(GenericStackedInline):
    """GenericStackedInline with translation support."""

from django.contrib.contenttypes.admin import GenericTabularInline
from modeltranslation.admin import TranslationGenericTabularInline

class TagInline(TranslationGenericTabularInline):
    model = Tag
    extra = 1

# Model with translations
@register(News)
class NewsTranslationOptions(TranslationOptions):
    fields = ('title', 'content', 'summary')

# Admin automatically creates language-specific fieldsets:
# - English: title_en, content_en, summary_en
# - French: title_fr, content_fr, summary_fr  
# - German: title_de, content_de, summary_de

@admin.register(News)
class NewsAdmin(TranslationAdmin):
    # No special configuration needed for basic translation support
    pass

@admin.register(Article)
class ArticleAdmin(TranslationAdmin):
    fieldsets = (
        (None, {
            'fields': ('title', 'slug', 'author')
        }),
        ('Content', {
            'fields': ('content', 'summary'),
            'classes': ('collapse',)
        }),
        ('Metadata', {
            'fields': ('published', 'created_at'),
            'classes': ('collapse',)
        })
    )
    # Translation fields are automatically added to appropriate fieldsets

class ClearableWidgetWrapper:
    """
    Widget wrapper that adds clear functionality for nullable translation fields.
    
    Parameters:
    - widget: Base widget to wrap
    - empty_value: Value to use when field is cleared (default: None)
    """

from modeltranslation.widgets import ClearableWidgetWrapper
from django import forms

class ArticleAdmin(TranslationAdmin):
    def formfield_for_dbfield(self, db_field, request, **kwargs):
        if db_field.name == 'optional_field':
            kwargs['widget'] = ClearableWidgetWrapper(forms.Textarea())
        return super().formfield_for_dbfield(db_field, request, **kwargs)

@admin.register(Article)
class ArticleAdmin(TranslationAdmin):
    prepopulated_fields = {'slug': ('title',)}
    # Automatically creates:
    # - slug_en from title_en
    # - slug_fr from title_fr
    # - slug_de from title_de

@register(Product)
class ProductTranslationOptions(TranslationOptions):
    fields = ('name', 'description')
    required_languages = ('en', 'fr')  # English and French are required

@admin.register(Product)  
class ProductAdmin(TranslationAdmin):
    # Admin automatically enforces required language validation
    pass

@admin.register(Article)
class ArticleAdmin(TranslationAdmin):
    list_display = ('title', 'author', 'created_at')
    list_filter = ('author', 'created_at', 'category')
    search_fields = ('title', 'content')  # Searches across all language versions
    
    def get_search_results(self, request, queryset, search_term):
        # Custom search logic can access all translation fields
        return super().get_search_results(request, queryset, search_term)

# Assets are automatically included, but can be customized:
class CustomTranslationAdmin(TranslationAdmin):
    class Media:
        js = TranslationAdmin.Media.js + ('custom_translation.js',)
        css = {
            'all': TranslationAdmin.Media.css['all'] + ('custom_translation.css',)
        }

from django.contrib.admin import ModelAdmin
from modeltranslation.admin import TranslationBaseModelAdmin
from some_package.admin import SomeAdminMixin

class CustomArticleAdmin(SomeAdminMixin, TranslationBaseModelAdmin, ModelAdmin):
    # Combines functionality from multiple admin classes
    pass

class ConditionalTranslationAdmin(TranslationAdmin):
    def get_fieldsets(self, request, obj=None):
        fieldsets = super().get_fieldsets(request, obj)
        
        # Modify fieldsets based on user permissions or object state
        if not request.user.has_perm('myapp.change_advanced_fields'):
            # Remove advanced translation fields
            pass
            
        return fieldsets

def copy_translation(modeladmin, request, queryset):
    """Copy content from default language to other languages."""
    for obj in queryset:
        # Bulk translation logic
        pass

copy_translation.short_description = "Copy to all languages"

class ArticleAdmin(TranslationAdmin):
    actions = [copy_translation]

from django import forms
from modeltranslation.forms import TranslationModelForm

class ArticleTranslationForm(TranslationModelForm):
    class Meta:
        model = Article
        fields = '__all__'
    
    def clean(self):
        cleaned_data = super().clean()
        
        # Custom validation across translation fields
        title_en = cleaned_data.get('title_en')
        title_fr = cleaned_data.get('title_fr')
        
        if title_en and not title_fr:
            raise forms.ValidationError(
                "French title is required when English title is provided"
            )
        
        return cleaned_data

class ArticleAdmin(TranslationAdmin):
    form = ArticleTranslationForm