"""
News correlation service.

- NewsAPI.org: structured news articles per bill (100 req/day limit)
- Google News RSS: volume signal for zeitgeist scoring (no limit)
"""
import logging
import time
import urllib.parse
from datetime import datetime, timedelta, timezone
from typing import Optional

import feedparser
import requests
from tenacity import retry, stop_after_attempt, wait_exponential

from app.config import settings

logger = logging.getLogger(__name__)

NEWSAPI_BASE = "https://newsapi.org/v2"
GOOGLE_NEWS_RSS = "https://news.google.com/rss/search"
NEWSAPI_DAILY_LIMIT = 95  # Leave 5 as buffer


@retry(stop=stop_after_attempt(2), wait=wait_exponential(min=1, max=5))
def _newsapi_get(endpoint: str, params: dict) -> dict:
    params["apiKey"] = settings.NEWSAPI_KEY
    response = requests.get(f"{NEWSAPI_BASE}/{endpoint}", params=params, timeout=30)
    response.raise_for_status()
    return response.json()


def build_news_query(bill_title: str, short_title: Optional[str], sponsor_name: Optional[str],
                     bill_type: str, bill_number: int) -> str:
    """Build a NewsAPI search query for a bill."""
    terms = []
    if short_title:
        terms.append(f'"{short_title}"')
    elif bill_title:
        # Use first 6 words of title as phrase
        words = bill_title.split()[:6]
        if len(words) >= 3:
            terms.append(f'"{" ".join(words)}"')
    # Add bill number as fallback
    terms.append(f'"{bill_type.upper()} {bill_number}"')
    return " OR ".join(terms[:2])  # Keep queries short for relevance


def fetch_newsapi_articles(query: str, days: int = 30) -> list[dict]:
    """Fetch articles from NewsAPI.org. Returns empty list if quota is exhausted or key not set."""
    if not settings.NEWSAPI_KEY:
        return []
    try:
        from_date = (datetime.now(timezone.utc) - timedelta(days=days)).strftime("%Y-%m-%d")
        data = _newsapi_get("everything", {
            "q": query,
            "language": "en",
            "sortBy": "relevancy",
            "pageSize": 10,
            "from": from_date,
        })
        articles = data.get("articles", [])
        return [
            {
                "source": a.get("source", {}).get("name", ""),
                "headline": a.get("title", ""),
                "url": a.get("url", ""),
                "published_at": a.get("publishedAt"),
            }
            for a in articles
            if a.get("url") and a.get("title")
        ]
    except Exception as e:
        logger.error(f"NewsAPI fetch failed: {e}")
        return []


def fetch_gnews_count(query: str, days: int = 30) -> int:
    """Count articles in Google News RSS for the past N days. Used as volume signal."""
    try:
        encoded = urllib.parse.quote(f"{query} when:{days}d")
        url = f"{GOOGLE_NEWS_RSS}?q={encoded}&hl=en-US&gl=US&ceid=US:en"
        time.sleep(1)  # Polite delay
        feed = feedparser.parse(url)
        return len(feed.entries)
    except Exception as e:
        logger.error(f"Google News RSS fetch failed: {e}")
        return 0


def fetch_gnews_articles(query: str, days: int = 30) -> list[dict]:
    """Fetch articles from Google News RSS. No rate limit — unlimited source."""
    import time as time_mod
    try:
        encoded = urllib.parse.quote(f"{query} when:{days}d")
        url = f"{GOOGLE_NEWS_RSS}?q={encoded}&hl=en-US&gl=US&ceid=US:en"
        time.sleep(1)  # Polite delay
        feed = feedparser.parse(url)
        articles = []
        for entry in feed.entries[:20]:
            pub_at = None
            if entry.get("published_parsed"):
                try:
                    pub_at = datetime.fromtimestamp(
                        time_mod.mktime(entry.published_parsed), tz=timezone.utc
                    ).isoformat()
                except Exception:
                    pass
            source = ""
            if hasattr(entry, "source") and isinstance(entry.source, dict):
                source = entry.source.get("title", "")
            elif entry.get("tags"):
                source = entry.tags[0].get("term", "") if entry.tags else ""
            articles.append({
                "source": source or "Google News",
                "headline": entry.get("title", ""),
                "url": entry.get("link", ""),
                "published_at": pub_at,
            })
        return [a for a in articles if a["url"] and a["headline"]]
    except Exception as e:
        logger.error(f"Google News RSS article fetch failed: {e}")
        return []


def build_member_query(first_name: str, last_name: str, chamber: Optional[str] = None) -> str:
    """Build a news search query for a member of Congress."""
    full_name = f"{first_name} {last_name}".strip()
    title = ""
    if chamber:
        if "senate" in chamber.lower():
            title = "Senator"
        else:
            title = "Rep."
    if title:
        return f'"{full_name}" OR "{title} {last_name}"'
    return f'"{full_name}"'