"""
Custom pagination classes for the API.
"""
from rest_framework.pagination import PageNumberPagination
from rest_framework.response import Response


class StandardResultsSetPagination(PageNumberPagination):
    """
    Standard pagination for API responses.
    """
    page_size = 50
    page_size_query_param = 'page_size'
    max_page_size = 1000
    
    def get_paginated_response(self, data):
        return Response({
            'count': self.page.paginator.count,
            'next': self.get_next_link(),
            'previous': self.get_previous_link(),
            'results': data,
            'page': self.page.number,
            'pages': self.page.paginator.num_pages,
            'page_size': self.page_size,
        })


class LargeResultsSetPagination(PageNumberPagination):
    """
    Pagination for large datasets (e.g., transactions).
    """
    page_size = 100
    page_size_query_param = 'page_size'
    max_page_size = 5000
    
    def get_paginated_response(self, data):
        return Response({
            'count': self.page.paginator.count,
            'next': self.get_next_link(),
            'previous': self.get_previous_link(),
            'results': data,
            'page': self.page.number,
            'pages': self.page.paginator.num_pages,
            'page_size': self.page_size,
        })