from typing import List, Optional

from pydantic import BaseModel, Field, validator


class ChatRequest(BaseModel):
    message: str = Field(..., min_length=1, max_length=10000)
    provider: Optional[str] = None

    @validator("message")
    def message_not_empty(cls, v):
        if not v.strip():
            raise ValueError("Message cannot be empty or whitespace")
        return v.strip()


class ChatResponse(BaseModel):
    message: str
    provider: str


class ProviderListResponse(BaseModel):
    providers: List[str]
    default: str