from typing import List, Dict, Any, Optional
from pydantic import BaseModel

class RAGDocument(BaseModel):
    text: str
    metadata: Dict[str, Any] = {}
    similarity: Optional[float] = None

class RAGSearchResult(BaseModel):
    id: str
    text: str
    similarity: float
    metadata: Dict[str, Any]

class ChatMessage(BaseModel):
    role: str
    content: str

class TTSRequest(BaseModel):
    text: str
    language: str = 'vi'
    provider: str = 'auto'