"""EmbeddingProvider port — 文本向量化能力契约。"""

from typing import Protocol, runtime_checkable


@runtime_checkable
class EmbeddingProvider(Protocol):
    def is_available(self) -> bool:
        """进程内 embedding 已配置且可发起调用（无 key / 未初始化 client 时为 False）。"""
        ...

    async def embed_text(self, text: str) -> list[float]:
        """Embed a single text into a vector."""
        ...

    async def embed_texts(self, texts: list[str]) -> list[list[float]]:
        """Embed multiple texts into vectors."""
        ...

    def embed_text_sync(self, text: str) -> list[float]:
        """同步嵌入单条文本（Celery / sync DB 会话）。"""
        ...

    def embed_texts_sync(self, texts: list[str]) -> list[list[float]]:
        """同步嵌入多条文本（Celery / sync DB 会话）。"""
        ...