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


class ChatMessage(BaseModel):
    role: str  # "user" or "assistant"
    content: str


class ChatRequest(BaseModel):
    messages: List[ChatMessage]
    model: str = "sam-x-nano"
    max_tokens: Optional[int] = 512
    temperature: Optional[float] = 0.8
    top_k: Optional[int] = 40
    top_p: Optional[float] = 0.9
    repetition_penalty: Optional[float] = 1.1
    stream: Optional[bool] = False


class ChatResponse(BaseModel):
    id: str
    object: str = "chat.completion"
    created: int
    model: str
    choices: List[Dict[str, Any]]
    usage: Dict[str, int]


class WorkerStatus(BaseModel):
    model_name: str
    is_active: bool
    load: float
    last_heartbeat: int