"""Base class for Yahoo search engines."""

from __future__ import annotations

from secrets import token_urlsafe
from typing import Generic, TypeVar

from ...base import BaseSearchEngine

T = TypeVar("T")

class YahooSearchEngine(BaseSearchEngine[T], Generic[T]):
    """Base class for Yahoo search engines.

    Yahoo search is powered by Bing but has its own interface.
    All Yahoo searches use dynamic URLs with tokens for tracking.
    """

    provider = "yahoo"
    _base_url = "https://search.yahoo.com"

    def generate_ylt_token(self) -> str:
        """Generate Yahoo _ylt tracking token."""
        return token_urlsafe(24 * 3 // 4)

    def generate_ylu_token(self) -> str:
        """Generate Yahoo _ylu tracking token."""
        return token_urlsafe(47 * 3 // 4)

    def build_search_url(self, base_path: str) -> str:
        """Build search URL with tracking tokens."""
        ylt = self.generate_ylt_token()
        ylu = self.generate_ylu_token()
        return f"{self._base_url}/{base_path};_ylt={ylt};_ylu={ylu}"
