"""Finnhub news service — company news with sentiment."""
import os
import time
import requests
import streamlit as st
from dotenv import load_dotenv

load_dotenv()

BASE_URL = "https://finnhub.io/api/v1"


def _api_key() -> str:
    return os.getenv("FINNHUB_API_KEY", "")


def _get(endpoint: str, params: dict = None) -> dict | list | None:
    params = params or {}
    params["token"] = _api_key()
    try:
        resp = requests.get(f"{BASE_URL}{endpoint}", params=params, timeout=10)
        resp.raise_for_status()
        return resp.json()
    except Exception:
        return None


@st.cache_data(ttl=600)
def get_company_news(ticker: str, days_back: int = 7) -> list[dict]:
    """Return recent news articles with sentiment for a ticker."""
    end = int(time.time())
    start = end - days_back * 86400
    from datetime import datetime
    date_from = datetime.utcfromtimestamp(start).strftime("%Y-%m-%d")
    date_to = datetime.utcfromtimestamp(end).strftime("%Y-%m-%d")

    data = _get("/company-news", params={
        "symbol": ticker.upper(),
        "from": date_from,
        "to": date_to,
    })
    if not data or not isinstance(data, list):
        return []
    return data[:30]


@st.cache_data(ttl=600)
def get_news_sentiment(ticker: str) -> dict:
    """Return sentiment scores for a ticker."""
    data = _get("/news-sentiment", params={"symbol": ticker.upper()})
    if data and isinstance(data, dict):
        return data
    return {}