"""Nova Chat Schema

请求参数 Param、响应 Dto。
字段命名使用 camelCase alias，与前端 JSON 对齐。
"""

from typing import Literal, Optional

from pydantic import BaseModel, Field

ChatRole = Literal["user", "assistant"]


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


class NovaChatParam(BaseModel):
    message: str = Field(..., description="用户输入的消息")
    resume_id: int = Field(..., alias="resumeId", description="简历ID")
    job_id: Optional[int] = Field(default=None, alias="jobId", description="当前浏览岗位ID，不传则无岗位上下文")
    history: list[ChatMessage] = Field(default_factory=list, description="历史对话，前端维护")


class NovaChatDto(BaseModel):
    message: str = Field(..., description="AI回复，Markdown格式")