"""Sentiment provider for any OpenAI-compatible Chat Completions endpoint.

Covers DeepSeek, OpenRouter, Together, Groq, Mistral, local Ollama, etc. — any
service exposing the OpenAI Chat Completions API at a custom base_url.

NOTE: Unlike the OpenAI Responses provider and Gemini, this path has NO web
search grounding. Sentiment reflects the model's training knowledge, not live
news. Cheap, but not real-time.
"""

from __future__ import annotations

import json
import logging
import os
from datetime import datetime, timezone
from pathlib import Path

import httpx
from openai import AsyncOpenAI

from app.exceptions import ProviderError, RateLimitError
from app.providers.protocol import SentimentData

logger = logging.getLogger(__name__)

_CA_BUNDLE = os.environ.get("SSL_CERT_FILE", "")

_SENTIMENT_PROMPT = """\
Assess the CURRENT market sentiment for the stock ticker {ticker} based on your \
knowledge of the company, its sector, and recent developments you are aware of, \
and whether BUYING here looks advisable.

Respond ONLY with a JSON object (no markdown, no extra text):
{{"classification": "<bullish|bearish|neutral>", "confidence": <0-100>, "recommendation": "<buy|hold|avoid>", "reasoning": "<a thorough explanation of the drivers>"}}

Rules:
- classification must be exactly one of: bullish, bearish, neutral
- recommendation must be exactly one of: buy, hold, avoid
- confidence must be an integer from 0 to 100
- reasoning should be several sentences
"""

VALID_CLASSIFICATIONS = {"bullish", "bearish", "neutral"}
VALID_RECOMMENDATIONS = {"buy", "hold", "avoid"}


def _parse_recommendation(value: object) -> str | None:
    v = str(value or "").strip().lower()
    return v if v in VALID_RECOMMENDATIONS else None


def _clean_json_text(raw: str) -> str:
    clean = raw.strip()
    if clean.startswith("```"):
        clean = clean.split("\n", 1)[1] if "\n" in clean else clean[3:]
    if clean.endswith("```"):
        clean = clean[:-3]
    return clean.strip()


class OpenAICompatibleSentimentProvider:
    """Sentiment via the OpenAI Chat Completions API at a configurable base_url."""

    def __init__(
        self,
        api_key: str,
        model: str,
        base_url: str,
        source: str = "openai_compatible",
    ) -> None:
        if not api_key:
            raise ProviderError("API key is required")
        if not base_url:
            raise ProviderError("base_url is required for an OpenAI-compatible provider")
        if not model:
            raise ProviderError("model is required")

        http_kwargs: dict = {}
        if _CA_BUNDLE and Path(_CA_BUNDLE).exists():
            http_kwargs["verify"] = _CA_BUNDLE
        http_client = httpx.AsyncClient(**http_kwargs)
        self._client = AsyncOpenAI(api_key=api_key, base_url=base_url, http_client=http_client)
        self._model = model
        self._source = source

    async def fetch_sentiment(self, ticker: str) -> SentimentData:
        try:
            response = await self._client.chat.completions.create(
                model=self._model,
                messages=[
                    {
                        "role": "system",
                        "content": "You are a financial sentiment analyst. Always respond with valid JSON only, no markdown fences.",
                    },
                    {"role": "user", "content": _SENTIMENT_PROMPT.format(ticker=ticker)},
                ],
                temperature=0.3,
            )
            raw_text = (response.choices[0].message.content or "").strip()
            if not raw_text:
                raise ProviderError(f"Empty response from {self._source} for {ticker}")

            parsed = json.loads(_clean_json_text(raw_text))

            classification = str(parsed.get("classification", "")).lower()
            if classification not in VALID_CLASSIFICATIONS:
                raise ProviderError(
                    f"Invalid classification '{classification}' from {self._source} for {ticker}"
                )

            confidence = max(0, min(100, int(parsed.get("confidence", 50))))
            reasoning = str(parsed.get("reasoning", ""))
            if reasoning:
                logger.info(
                    "%s sentiment for %s: %s (confidence=%d) — %s",
                    self._source, ticker, classification, confidence, reasoning,
                )

            return SentimentData(
                ticker=ticker,
                classification=classification,
                confidence=confidence,
                source=self._source,
                timestamp=datetime.now(timezone.utc),
                reasoning=reasoning,
                recommendation=_parse_recommendation(parsed.get("recommendation")),
            )

        except json.JSONDecodeError as exc:
            logger.error("Failed to parse %s JSON for %s: %s", self._source, ticker, exc)
            raise ProviderError(f"Invalid JSON from {self._source} for {ticker}") from exc
        except ProviderError:
            raise
        except Exception as exc:
            msg = str(exc).lower()
            if "429" in msg or "rate" in msg or "quota" in msg or "insufficient" in msg:
                raise RateLimitError(f"{self._source} rate limit hit for {ticker}") from exc
            logger.error("%s provider error for %s: %s", self._source, ticker, exc)
            raise ProviderError(f"{self._source} provider error for {ticker}: {exc}") from exc