import json
import time
from pathlib import Path
from typing import Optional

from fastapi import APIRouter
from pydantic import BaseModel, field_validator

from src.config import get_settings

router = APIRouter()


class FeedbackRequest(BaseModel):
    question: str
    feedback: str
    answer_excerpt: Optional[str] = ""

    @field_validator("feedback")
    @classmethod
    def valid_feedback(cls, v: str) -> str:
        if v not in {"up", "down"}:
            raise ValueError("feedback must be up or down")
        return v


@router.post("")
async def save_feedback(req: FeedbackRequest):
    settings = get_settings()
    payload = {
        "timestamp": time.time(),
        "question": req.question[:1000],
        "feedback": req.feedback,
        "answer_excerpt": (req.answer_excerpt or "")[:1500],
    }
    settings.feedback_path.parent.mkdir(parents=True, exist_ok=True)
    with settings.feedback_path.open("a", encoding="utf-8") as handle:
        handle.write(json.dumps(payload, ensure_ascii=False) + "\n")
    try:
        from app import metrics_service
        metrics_service.incr("feedback_total")
        metrics_service.incr_bucket("feedback_breakdown", req.feedback)
    except Exception:
        pass
    return {"status": "ok"}