import json
from pathlib import Path
from typing import Any

import httpx

from app.config import get_settings
from app.services.mock_data_service import mock_ai_cleaning_result
from app.services.qa_parser import normalize_ai_item
from app.utils.json_validator import validate_ai_qa_items


PROMPT_PATH = Path(__file__).resolve().parents[1] / "prompts" / "qa_cleaning_prompt.md"


class AICleaner:
    def __init__(self) -> None:
        self.settings = get_settings()

    def _prompt(self) -> str:
        return PROMPT_PATH.read_text(encoding="utf-8")

    async def clean_transcript(self, session_id: int, transcript: str) -> list[dict[str, Any]]:
        if not self.settings.openai_configured:
            return [normalize_ai_item(item) for item in mock_ai_cleaning_result(session_id)]

        payload = {
            "model": self.settings.model_name,
            "messages": [
                {"role": "system", "content": self._prompt()},
                {
                    "role": "user",
                    "content": f"场次 ID: {session_id}\n\n以下是转写稿：\n{transcript}",
                },
            ],
            "temperature": 0.1,
        }
        base_url = (self.settings.openai_base_url or "https://api.openai.com/v1").rstrip("/")
        headers = {"Authorization": f"Bearer {self.settings.openai_api_key}"}
        async with httpx.AsyncClient(timeout=60) as client:
            response = await client.post(f"{base_url}/chat/completions", headers=headers, json=payload)
            response.raise_for_status()
        content = response.json()["choices"][0]["message"]["content"]
        try:
            parsed = json.loads(content)
        except json.JSONDecodeError as exc:
            raise ValueError(f"AI 返回非法 JSON: {exc}") from exc
        return [normalize_ai_item(item) for item in validate_ai_qa_items(parsed)]