Django Import Export

from import_export import resources, fields, widgets
from import_export.admin import ImportExportModelAdmin, ExportActionModelAdmin
from import_export import results, exceptions

from import_export.formats.base_formats import CSV, XLSX, JSON, YAML, TSV

from import_export.instance_loaders import CachedInstanceLoader
from import_export.signals import post_import, post_export
from import_export.forms import ImportForm, ExportForm

from django.db import models
from import_export import resources, fields, widgets
from import_export.admin import ImportExportModelAdmin

# Define a model
class Book(models.Model):
    title = models.CharField(max_length=200)
    author = models.CharField(max_length=100)
    published_date = models.DateField()
    isbn = models.CharField(max_length=13)

# Define a resource for the model
class BookResource(resources.ModelResource):
    title = fields.Field(attribute='title', column_name='Book Title')
    author = fields.Field(attribute='author', column_name='Author Name')
    published_date = fields.Field(
        attribute='published_date',
        column_name='Publication Date',
        widget=widgets.DateWidget(format='%Y-%m-%d')
    )
    isbn = fields.Field(attribute='isbn', column_name='ISBN')

    class Meta:
        model = Book
        fields = ('title', 'author', 'published_date', 'isbn')
        export_order = ('title', 'author', 'published_date', 'isbn')

# Use in Django admin
class BookAdmin(ImportExportModelAdmin):
    resource_class = BookResource
    list_display = ['title', 'author', 'published_date']

# Programmatic usage
resource = BookResource()

# Export data
dataset = resource.export()
csv_data = dataset.csv

# Import data from CSV
from tablib import Dataset
dataset = Dataset()
dataset.csv = csv_data
result = resource.import_data(dataset, dry_run=True)

if not result.has_errors():
    resource.import_data(dataset, dry_run=False)

class Resource(metaclass=DeclarativeMetaclass):
    def __init__(self, **kwargs): ...
    def import_data(self, dataset, dry_run=False, raise_errors=False, use_transactions=None, collect_failed_rows=False, rollback_on_validation_errors=False, **kwargs) -> Result: ...
    def export(self, queryset=None, **kwargs) -> Dataset: ...
    def import_row(self, row, instance_loader, **kwargs) -> RowResult: ...
    def get_or_init_instance(self, instance_loader, row) -> tuple: ...
    def validate_instance(self, instance, import_validation_errors=None, validate_unique=True): ...
    def save_instance(self, instance, is_create, row, **kwargs): ...
    def bulk_create(self, using_transactions, dry_run, raise_errors, batch_size=None, result=None): ...
    def bulk_update(self, using_transactions, dry_run, raise_errors, batch_size=None, result=None): ...
    def bulk_delete(self, using_transactions, dry_run, raise_errors, result=None): ...
    # Hook methods for customization
    def before_import(self, dataset, **kwargs): ...
    def after_import(self, dataset, result, **kwargs): ...
    def before_import_row(self, row, **kwargs): ...
    def after_import_row(self, row, row_result, **kwargs): ...

class ModelResource(Resource, metaclass=ModelDeclarativeMetaclass):
    def get_queryset(self) -> QuerySet: ...
    def field_from_django_field(self, field_name, django_field, readonly) -> Field: ...

class Field:
    def __init__(self, attribute=None, column_name=None, widget=None, default=NOT_PROVIDED, readonly=False, saves_null_values=True, dehydrate_method=None, m2m_add=False): ...
    def clean(self, row, **kwargs): ...
    def export(self, instance, **kwargs): ...
    def save(self, instance, row, is_m2m=False, **kwargs): ...

class ImportMixin(BaseImportMixin, ImportExportMixinBase):
    def import_action(self, request, **kwargs): ...
    def process_import(self, request, **kwargs): ...
    def has_import_permission(self, request): ...

class ExportMixin(BaseExportMixin, ImportExportMixinBase):
    def export_action(self, request): ...
    def get_export_data(self, file_format, request, queryset, **kwargs): ...
    def has_export_permission(self, request): ...

class ImportExportModelAdmin(ImportExportMixin, admin.ModelAdmin): ...
class ExportActionModelAdmin(ExportActionMixin, admin.ModelAdmin): ...

class Widget:
    def clean(self, value, row=None, **kwargs): ...
    def render(self, value, obj=None, **kwargs): ...

class ForeignKeyWidget(Widget):
    def __init__(self, model, field="pk", use_natural_foreign_keys=False, key_is_id=False, **kwargs): ...
    def get_queryset(self, value, row, *args, **kwargs): ...

class ManyToManyWidget(Widget):
    def __init__(self, model, separator=None, field=None, **kwargs): ...

# Data type widgets
class DateWidget(Widget): ...
class DateTimeWidget(Widget): ...
class BooleanWidget(Widget): ...
class JSONWidget(Widget): ...

class Format:
    def create_dataset(self, in_stream): ...
    def export_data(self, dataset, **kwargs): ...
    def is_binary(self): ...
    def get_extension(self): ...

class CSV(TextFormat): ...
class XLSX(TablibFormat): ...
class JSON(TextFormat): ...
class YAML(TextFormat): ...

# Format utilities
def get_format_class(format_name, file_name, encoding=None): ...
def get_default_format_names(): ...

class ImportForm(ImportExportFormBase):
    def __init__(self, import_formats, **kwargs): ...

class ConfirmImportForm(forms.Form):
    def __init__(self, confirm_form_class, import_form_data, **kwargs): ...

class ExportForm(ImportExportFormBase): ...
class SelectableFieldsExportForm(ExportForm): ...

# Export command
python manage.py export <format> <resource> [--encoding=<encoding>]

# Import command  
python manage.py import <format> <resource> <file> [--encoding=<encoding>] [--dry-run]

class ImportExportError(Exception): ...
class FieldError(ImportExportError): ...
class ImportError(ImportExportError):
    def __init__(self, error, number=None, row=None): ...

class Result:
    def has_errors(self): ...
    def has_validation_errors(self): ...
    def valid_rows(self): ...

class RowResult:
    IMPORT_TYPE_UPDATE = 'update'
    IMPORT_TYPE_NEW = 'new'
    IMPORT_TYPE_DELETE = 'delete'
    IMPORT_TYPE_SKIP = 'skip'
    IMPORT_TYPE_ERROR = 'error'
    IMPORT_TYPE_INVALID = 'invalid'
    
    def is_update(self): ...
    def is_new(self): ...
    def is_error(self): ...

from import_export.signals import post_import, post_export

# Django signals
post_import = Signal()  # Args: model
post_export = Signal()  # Args: model

class BaseInstanceLoader:
    def get_instance(self, row): ...

class ModelInstanceLoader(BaseInstanceLoader):
    def __init__(self, resource_class, dataset=None): ...

class CachedInstanceLoader(ModelInstanceLoader):
    # Pre-loads instances for performance
    def __init__(self, resource_class, dataset=None): ...

class Meta:
    model = None  # Django model class
    fields = None  # Field whitelist
    exclude = None  # Field blacklist
    import_id_fields = ('id',)  # Instance identification fields
    import_order = ()  # Import field order
    export_order = ()  # Export field order
    use_transactions = None  # Transaction usage
    skip_unchanged = False  # Skip unchanged records
    clean_model_instances = False  # Call full_clean()
    use_bulk = False  # Enable bulk operations
    batch_size = 1000  # Bulk operation batch size

from typing import Dict, List, Optional, Union, Any, Tuple
from django.db.models import Model, QuerySet
from django.core.exceptions import ValidationError
from tablib import Dataset

# Core types
ResourceOptions = Dict[str, Any]
WidgetKwargs = Dict[str, Any]
RowData = Dict[str, Any]
ImportResult = Result
ExportDataset = Dataset
InstanceTuple = Tuple[Model, bool]  # (instance, created)
ErrorList = List[Union[Exception, ValidationError]]

# Metaclasses and constants
DeclarativeMetaclass = type  # Metaclass for declarative resource definition
ModelDeclarativeMetaclass = type  # Metaclass for model-based resources
NOT_PROVIDED = object()  # Sentinel value for unset field defaults

# Result classes
class Result:
    rows: List[RowResult]
    invalid_rows: List[dict]
    error_rows: List[dict]
    totals: Dict[str, int]
    
class RowResult:
    IMPORT_TYPE_NEW = 'new'
    IMPORT_TYPE_UPDATE = 'update'
    IMPORT_TYPE_DELETE = 'delete' 
    IMPORT_TYPE_SKIP = 'skip'
    IMPORT_TYPE_ERROR = 'error'
    IMPORT_TYPE_INVALID = 'invalid'