"""Nova Chat AI 引擎

构造 prompt + 调 LLM，直接返回 Markdown 文本。
依赖：LLM 枚举、nova_chat/prompts
"""

from app.ai.models import LLM
from app.ai.nova_chat.prompts import SYSTEM_PROMPT
from app.core.logger import log


async def nova_chat(resume_text: str, message: str, history: list[dict],
                    job_context: str) -> str:
    """Nova 对话：拼 prompt → 拼历史 → 调 LLM → 返回 Markdown 文本"""

    system_content = SYSTEM_PROMPT.format(
        resume_text=resume_text,
        job_context=job_context,
    )

    messages = [("system", system_content)]
    for msg in history:
        messages.append((msg["role"], msg["content"]))
    messages.append(("human", message))

    try:
        llm = LLM.JIAYU_CLAUDE_SONNET_4_5.create(temperature=0.7)
        result = await llm.ainvoke(messages)
        return result.content.strip()
    except Exception as e:
        log.error(f"Nova Chat AI 调用失败: {e}")
        return "抱歉，我暂时无法回复，请稍后再试。"