Utils and Configuration

def get_language():
    """
    Get active language code guaranteed to be in AVAILABLE_LANGUAGES.
    
    Returns:
    - str: Active language code, falls back to DEFAULT_LANGUAGE
    """

def get_language_bidi(lang):
    """
    Check if a language uses bidirectional text layout.
    
    Parameters:
    - lang: Language code (e.g., 'ar', 'he', 'en')
    
    Returns:
    - bool: True if language is bidirectional (RTL)
    """

from modeltranslation.utils import get_language, get_language_bidi

# Get current active language
current_lang = get_language()  # Returns 'en', 'fr', etc.

# Check text direction for UI layout
is_rtl = get_language_bidi('ar')  # True for Arabic
is_rtl = get_language_bidi('en')  # False for English

def build_localized_fieldname(field_name, lang):
    """
    Build localized field name by appending language code.
    
    Parameters:
    - field_name: Base field name (e.g., 'title')
    - lang: Language code (e.g., 'en', 'fr')
    
    Returns:
    - str: Localized field name (e.g., 'title_en')
    """

def get_translation_fields(*fields):
    """
    Get localized field names for given base field names.
    
    Parameters:
    - *fields: Base field names
    
    Returns:
    - list: All localized field names for all languages
    """

def parse_field(field_name, model):
    """
    Parse field name and return field information.
    
    Parameters:
    - field_name: Field name to parse
    - model: Model class containing the field
    
    Returns:
    - tuple: (field_object, field_info)
    """

from modeltranslation.utils import build_localized_fieldname, get_translation_fields

# Build individual localized field names
title_en = build_localized_fieldname('title', 'en')  # 'title_en'
title_fr = build_localized_fieldname('title', 'fr')  # 'title_fr'

# Get all translation fields for base fields
all_fields = get_translation_fields('title', 'content')
# Returns: ['title_en', 'title_fr', 'title_de', 'content_en', 'content_fr', 'content_de']

def get_field_from_path(model, path):
    """
    Get field object from dotted field path.
    
    Parameters:
    - model: Starting model class
    - path: Dotted field path (e.g., 'category__name')
    
    Returns:
    - Field: Django field object at end of path
    """

def build_localized_verbose_name(verbose_name, lang):
    """
    Build localized verbose name for field.
    
    Parameters:
    - verbose_name: Base verbose name
    - lang: Language code
    
    Returns:
    - str: Localized verbose name
    """

def build_localized_intermediary_model(field, lang):
    """
    Build localized intermediary model for M2M field.
    
    Parameters:
    - field: ManyToManyField instance
    - lang: Language code
    
    Returns:
    - Model: Localized intermediary model class
    """

def resolution_order(lang, fallback_languages):
    """
    Get language resolution order including fallbacks.
    
    Parameters:
    - lang: Primary language code
    - fallback_languages: Fallback language configuration
    
    Returns:
    - list: Ordered list of languages to try
    """

def unique(seq):
    """
    Remove duplicates from sequence while preserving order.
    
    Parameters:
    - seq: Sequence with potential duplicates
    
    Returns:
    - list: Sequence with duplicates removed
    """

from modeltranslation.utils import resolution_order

# Get language resolution order with fallbacks
order = resolution_order('fr', {'fr': ('en', 'de'), 'default': ('en',)})
# Returns: ['fr', 'en', 'de']

# For language not in fallback config
order = resolution_order('es', {'fr': ('en', 'de'), 'default': ('en',)})
# Returns: ['es', 'en']  # Uses default fallback

def auto_populate(sender, instance, **kwargs):
    """
    Signal handler for auto-populating translation fields.
    
    Parameters:
    - sender: Model class sending the signal
    - instance: Model instance being saved
    - **kwargs: Additional signal arguments
    """

def auto_populate_mode(mode):
    """
    Context manager for temporarily changing auto-populate mode.
    
    Parameters:
    - mode: Auto-populate mode ('required', 'all', False, or callable)
    
    Yields:
    - Context with specified auto-populate mode
    """

def fallbacks_disabled():
    """
    Context manager for temporarily disabling fallback languages.
    
    Yields:
    - Context with fallbacks disabled
    """

from modeltranslation.utils import auto_populate_mode, fallbacks_disabled

# Temporarily change auto-populate behavior
with auto_populate_mode('all'):
    # All translation fields will be auto-populated
    article = Article.objects.create(title='Test Title')
    # Creates title_en, title_fr, title_de all with 'Test Title'

# Temporarily disable fallbacks
with fallbacks_disabled():
    # No fallback values will be used
    articles = Article.objects.filter(title__icontains='test')
    # Only searches title field for current language, no fallbacks

def build_css_class(field_name, lang):
    """
    Build CSS class name for translation field.
    
    Parameters:
    - field_name: Base field name
    - lang: Language code
    
    Returns:
    - str: CSS class name for styling
    """

from modeltranslation.utils import build_css_class

# Build CSS classes for styling
css_class = build_css_class('title', 'en')  # 'modeltranslation-title-en'
css_class = build_css_class('content', 'fr')  # 'modeltranslation-content-fr'

def set_auto_populate(value):
    """
    Set auto-populate mode for current thread.
    
    Parameters:
    - value: Auto-populate mode (bool, str, or callable)
    """

def set_enable_fallbacks(value):
    """
    Set fallback enablement for current thread.
    
    Parameters:
    - value: Whether to enable fallbacks (bool)
    """

def auto_populate_mode():
    """
    Get current auto-populate mode for thread.
    
    Returns:
    - AutoPopulate mode for current context
    """

def fallbacks_enabled():
    """
    Check if fallbacks are enabled for current thread.
    
    Returns:
    - bool: True if fallbacks are enabled
    """

AVAILABLE_LANGUAGES: list
"""List of available language codes for translation."""

DEFAULT_LANGUAGE: str  
"""Default language code used as fallback."""

REQUIRED_LANGUAGES: tuple
"""Tuple of language codes that are required for translation fields."""

FALLBACK_LANGUAGES: dict
"""
Dictionary mapping language codes to fallback language lists.
Format: {'default': ('en',), 'fr': ('en', 'de')}
"""

ENABLE_FALLBACKS: bool
"""Whether fallback language functionality is enabled globally."""

# In Django settings.py
MODELTRANSLATION_LANGUAGES = ('en', 'fr', 'de', 'es')
MODELTRANSLATION_DEFAULT_LANGUAGE = 'en'
MODELTRANSLATION_REQUIRED_LANGUAGES = ('en', 'fr')
MODELTRANSLATION_FALLBACK_LANGUAGES = {
    'default': ('en',),
    'fr': ('en',),
    'de': ('en', 'fr'),
    'es': ('en', 'fr')
}
MODELTRANSLATION_ENABLE_FALLBACKS = True

CUSTOM_FIELDS: tuple
"""Tuple of custom field class names that can be translated."""

AUTO_POPULATE: bool | str | callable
"""
Auto-populate mode for translation fields:
- False: No auto-population
- 'required': Auto-populate required languages only  
- 'all': Auto-populate all languages
- callable: Custom auto-populate function
"""

PREPOPULATE_LANGUAGE: str | None
"""Fixed language for prepopulated fields like slugs."""

ENABLE_REGISTRATIONS: bool
"""Whether automatic translation registration discovery is enabled."""

DEBUG: bool
"""Enable debug mode for translation operations."""

# Custom field support
MODELTRANSLATION_CUSTOM_FIELDS = ('MyCustomField', 'SpecialTextField')

# Auto-population behavior
MODELTRANSLATION_AUTO_POPULATE = 'required'  # or False, 'all', or callable

# Prepopulated fields always use English
MODELTRANSLATION_PREPOPULATE_LANGUAGE = 'en'

# Debug mode (shows registered models on runserver)
MODELTRANSLATION_DEBUG = True

TRANSLATION_FILES: tuple
"""Tuple of module paths to explicitly import for translations."""

# Explicitly load translation modules
MODELTRANSLATION_TRANSLATION_FILES = (
    'myapp.custom_translations',
    'anotherapp.special_translations',
)

LOADDATA_RETAIN_LOCALE: bool
"""Whether loaddata command retains locale during fixture loading."""

BUILD_LOCALIZED_VERBOSE_NAME: callable
"""Function for building localized verbose names."""

def custom_auto_populate(field, model, language):
    """Custom auto-populate function."""
    # Get base field value
    base_value = getattr(model, field.original_field.name, None)
    
    if base_value and language != 'en':
        # Custom logic: append language code to base value
        return f"{base_value} ({language.upper()})"
    
    return base_value

# Use in settings
MODELTRANSLATION_AUTO_POPULATE = custom_auto_populate

from modeltranslation.utils import get_language
from django.utils import translation

class TranslationMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response
    
    def __call__(self, request):
        # Custom language detection logic
        detected_lang = self.detect_language(request)
        
        # Activate language for modeltranslation
        translation.activate(detected_lang)
        
        response = self.get_response(request)
        return response
    
    def detect_language(self, request):
        # Custom detection logic (headers, user preferences, etc.)
        return get_language()  # Fallback to default detection

from functools import lru_cache
from modeltranslation.utils import build_localized_fieldname

@lru_cache(maxsize=1000)
def cached_localized_fieldname(field_name, lang):
    """Cached version of build_localized_fieldname for performance."""
    return build_localized_fieldname(field_name, lang)

class OptimizedTranslationMixin:
    """Mixin for models with optimized translation field access."""
    
    def get_translated_field(self, field_name, language=None):
        """Get translated field value with caching."""
        lang = language or get_language()
        localized_name = cached_localized_fieldname(field_name, lang)
        return getattr(self, localized_name, None)