"""Step 10 – News collection.

Collects two categories of news data:

  Part A: Per-ticker news & press releases via YFinance (FREE, recent only).
  Part B: Per-scenario event-specific news via Firecrawl (date-targeted)
          with Tavily fallback.

Output
------
  data/news/tickers/{TICKER}.json   -- per-ticker yfinance news + press
  data/news/scenarios/{scenario_id}.json -- per-scenario Firecrawl/Tavily

Resume: skips if output file already exists.
"""

from __future__ import annotations

import asyncio
import json
import logging
import os
import time
from concurrent.futures import ThreadPoolExecutor
from pathlib import Path

import pandas as pd
from dotenv import load_dotenv

from projects.agent_builder.scripts.whatif_bench import config

load_dotenv()

logger = logging.getLogger(__name__)

# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------

def _ensure_dirs() -> tuple[Path, Path]:
    """Create news output directories and return (tickers_dir, scenarios_dir)."""
    tickers_dir = config.NEWS_DIR / "tickers"
    scenarios_dir = config.NEWS_DIR / "scenarios"
    tickers_dir.mkdir(parents=True, exist_ok=True)
    scenarios_dir.mkdir(parents=True, exist_ok=True)
    return tickers_dir, scenarios_dir


# ---------------------------------------------------------------------------
# Part A – Per-ticker news + press releases (yfinance, FREE)
# ---------------------------------------------------------------------------

def _collect_single_ticker_news(ticker: str, tickers_dir: Path, client) -> int:
    """Fetch news + press releases for a single ticker. Returns article count."""
    out_path = tickers_dir / f"{ticker}.json"
    if out_path.exists():
        return 0  # resume: already collected

    articles: list[dict] = []
    any_success = False

    for tab in ("news", "press releases"):
        for attempt in range(3):
            try:
                result = client.fetch_news_from_single_ticker(
                    ticker, tab=tab, count=config.NEWS_PER_TICKER_COUNT,
                )
                articles.extend([item.model_dump(mode="json") for item in result.root])
                any_success = True
                break
            except Exception:
                if attempt == 2:
                    logger.warning("Failed to fetch %s tab=%s after 3 attempts", ticker, tab)
                else:
                    time.sleep(2 ** attempt)

    # Fallback: if yfinance returned nothing, try Tavily for per-ticker news.
    # Tavily is a paid API but handles obscure small-caps better than yfinance.
    if not articles:
        tavily_key = os.environ.get("TAVILY_API_KEY", "")
        if tavily_key:
            try:
                from tavily import TavilyClient
                tv = TavilyClient(api_key=tavily_key)
                tv_results = tv.search(
                    query=f"{ticker} stock news financial",
                    search_depth="basic",
                    max_results=config.NEWS_PER_TICKER_COUNT,
                    topic="news",
                )
                for item in tv_results.get("results", []):
                    articles.append({
                        "source": "tavily",
                        "title": item.get("title", ""),
                        "url": item.get("url", ""),
                        "snippet": item.get("content", ""),
                        "date": item.get("published_date", ""),
                    })
                if articles:
                    any_success = True
                    logger.info("Tavily fallback for %s: %d articles", ticker, len(articles))
            except Exception as exc:
                logger.debug("Tavily fallback failed for %s: %s", ticker, exc)

    # Only write the file if at least one tab succeeded.
    # If ALL tabs failed, do NOT write — leave the file missing so it's retried next run.
    if any_success:
        tmp_path = out_path.with_suffix(".json.tmp")
        tmp_path.write_text(json.dumps(articles, default=str), encoding="utf-8")
        tmp_path.replace(out_path)  # atomic rename
    else:
        logger.warning("All tabs failed for %s — NOT writing file (will retry next run)", ticker)

    return len(articles)


# Shared lock to enforce actual rate limiting across threads
import threading
_rate_lock = threading.Lock()
_last_request_time = 0.0


def _rate_limited_worker(ticker: str, tickers_dir: Path, client) -> int:
    """Worker that enforces sequential rate limiting via a shared lock."""
    global _last_request_time
    with _rate_lock:
        elapsed = time.time() - _last_request_time
        if elapsed < config.NEWS_RATE_LIMIT_SEC:
            time.sleep(config.NEWS_RATE_LIMIT_SEC - elapsed)
        _last_request_time = time.time()
    return _collect_single_ticker_news(ticker, tickers_dir, client)


def _run_part_a(tickers: list[str], tickers_dir: Path) -> None:
    """Parallel per-ticker news collection with proper rate limiting."""
    logger.info("Part A: collecting per-ticker news for %d tickers …", len(tickers))

    from concurrent.futures import as_completed
    from projects.tools.finance.yahoo import YFinanceClient

    # Single shared client for connection reuse
    client = YFinanceClient()
    total_articles = 0
    done = 0

    with ThreadPoolExecutor(max_workers=config.NEWS_WORKERS) as pool:
        futures = {pool.submit(_rate_limited_worker, t, tickers_dir, client): t for t in tickers}
        for future in as_completed(futures):
            ticker = futures[future]
            try:
                n = future.result()
                total_articles += n
            except Exception:
                logger.exception("Error collecting news for %s", ticker)
            done += 1
            if done % 200 == 0:
                logger.info("  Part A progress: %d / %d tickers", done, len(tickers))

    logger.info("Part A complete: %d articles across %d tickers", total_articles, len(tickers))


# ---------------------------------------------------------------------------
# Part B – Scenario-event news (Firecrawl + Tavily fallback)
# ---------------------------------------------------------------------------

async def _collect_single_scenario_news(
    scenario: dict,
    scenarios_dir: Path,
    firecrawl_client,
    tavily_client,
) -> int:
    """Fetch news for a single scenario event. Returns article count."""
    sc_id = scenario["scenario_id"]
    out_path = scenarios_dir / f"{sc_id}.json"
    if out_path.exists():
        return 0

    event_date = pd.Timestamp(scenario["event_date"])
    # Wider window (±30 days) — narrow windows return empty from news APIs
    start = (event_date - pd.Timedelta(days=30)).strftime("%-m/%-d/%Y")
    end = (event_date + pd.Timedelta(days=30)).strftime("%-m/%-d/%Y")
    tbs = f"cdr:1,cd_min:{start},cd_max:{end}"
    # Simplify query: use event_type keywords + date, not full description
    event_type = scenario.get("event_type", "").replace("_", " ")
    year_month = event_date.strftime("%B %Y")
    query = f"{event_type} {year_month} financial markets impact"

    articles: list[dict] = []

    # Try Firecrawl first
    try:
        fc_results = await firecrawl_client._search(
            query=query,
            limit=config.NEWS_SCENARIO_LIMIT,
            sources=["news"],
            categories=[],
            tbs=tbs,
        )
        if fc_results and hasattr(fc_results, "news") and fc_results.news:
            for item in fc_results.news:
                articles.append({
                    "source": "firecrawl",
                    "title": getattr(item, "title", ""),
                    "url": getattr(item, "url", ""),
                    "snippet": getattr(item, "snippet", getattr(item, "description", "")),
                    "date": getattr(item, "date", ""),
                })
    except Exception:
        logger.warning("Firecrawl failed for scenario %s, trying Tavily", sc_id)

    # Tavily fallback if Firecrawl returned nothing
    if not articles and tavily_client is not None:
        try:
            tv_results = await tavily_client._search(
                query=query,
                search_depth="advanced",
                include_raw_content=True,
                max_results=config.NEWS_SCENARIO_LIMIT,
            )
            for item in tv_results.get("results", []):
                articles.append({
                    "source": "tavily",
                    "title": item.get("title", ""),
                    "url": item.get("url", ""),
                    "snippet": item.get("content", ""),
                    "date": item.get("published_date", ""),
                    "raw_content": item.get("raw_content", ""),
                })
        except Exception:
            logger.warning("Tavily also failed for scenario %s", sc_id)

    out_path.write_text(json.dumps(articles, default=str), encoding="utf-8")
    return len(articles)


async def _run_part_b(scenarios_dir: Path) -> None:
    """Async per-scenario news collection."""
    # Load scenarios
    benchmark_dir = config.get_benchmark_dir()
    scenarios_path = benchmark_dir / "scenarios.parquet"
    if not scenarios_path.exists():
        logger.warning("scenarios.parquet not found at %s — skipping Part B", scenarios_path)
        return

    scenarios_df = pd.read_parquet(scenarios_path)
    scenarios = scenarios_df.to_dict("records")
    logger.info("Part B: collecting scenario news for %d events …", len(scenarios))

    # Init clients
    firecrawl_api_key = os.environ.get("FIRECRAWL_API_KEY", "")
    tavily_api_key = os.environ.get("TAVILY_API_KEY", "")

    from projects.tools.web.firecrawl_search import FirecrawlClient
    from projects.tools.web.tavily_search import TavilyClient

    fc_client = FirecrawlClient(api_key=firecrawl_api_key) if firecrawl_api_key else None
    tv_client = TavilyClient(api_key=tavily_api_key) if tavily_api_key else None

    if fc_client is None and tv_client is None:
        logger.error("Neither FIRECRAWL_API_KEY nor TAVILY_API_KEY set — skipping Part B")
        return

    total = 0
    for i, sc in enumerate(scenarios):
        if fc_client is not None:
            n = await _collect_single_scenario_news(sc, scenarios_dir, fc_client, tv_client)
        elif tv_client is not None:
            n = await _collect_single_scenario_news(sc, scenarios_dir, None, tv_client)
        else:
            n = 0
        total += n
        await asyncio.sleep(config.NEWS_RATE_LIMIT_SEC)
        if (i + 1) % 10 == 0:
            logger.info("  Part B progress: %d / %d scenarios", i + 1, len(scenarios))

    logger.info("Part B complete: %d articles across %d scenarios", total, len(scenarios))


# ---------------------------------------------------------------------------
# Public entry points
# ---------------------------------------------------------------------------

async def run_async(tickers: list[str] | None = None) -> None:
    """Run both Part A and Part B news collection.

    Parameters
    ----------
    tickers : list[str] | None
        Ticker symbols for Part A. If None, reads from universe CSV.
    """
    tickers_dir, scenarios_dir = _ensure_dirs()

    # Resolve tickers
    if tickers is None:
        universe_path = config.UNIVERSE_DIR / "benchmark_universe.csv"
        if universe_path.exists():
            tickers = pd.read_csv(universe_path)["ticker"].tolist()
        else:
            logger.error("No tickers provided and universe CSV not found")
            return

    # Part A: synchronous (uses ThreadPoolExecutor internally)
    _run_part_a(tickers, tickers_dir)

    # Part B: async
    await _run_part_b(scenarios_dir)

    logger.info("News collection complete.")