"""X/Twitter search via ScrapeCreators API for /last30days.

Uses ScrapeCreators REST API to search Twitter/X by keyword.
Same API key as Reddit, TikTok, and Instagram - one key covers all social sources.

Requires SCRAPECREATORS_API_KEY in config.
API docs: https://scrapecreators.com/docs
"""

import sys
from datetime import datetime, timezone
from typing import Any, Dict, List, Optional

try:
    import requests as _requests
except ImportError:
    _requests = None

SCRAPECREATORS_BASE = "https://api.scrapecreators.com/v1/twitter"

DEPTH_CONFIG = {
    "quick":   {"results_per_page": 10},
    "default": {"results_per_page": 20},
    "deep":    {"results_per_page": 40},
}

from .relevance import token_overlap_relevance as _compute_relevance


def _extract_core_subject(topic: str) -> str:
    """Extract core subject from verbose query for Twitter search."""
    from .query import extract_core_subject
    _SC_X_NOISE = frozenset({
        'best', 'top', 'good', 'great', 'awesome',
        'latest', 'new', 'news', 'update', 'updates',
        'trending', 'hottest', 'popular', 'viral',
        'practices', 'features', 'recommendations', 'advice',
    })
    return extract_core_subject(topic, noise=_SC_X_NOISE)


def _log(msg: str):
    if sys.stderr.isatty():
        sys.stderr.write(f"[X/SC] {msg}\n")
        sys.stderr.flush()


def _sc_headers(token: str) -> Dict[str, str]:
    return {
        "x-api-key": token,
        "Content-Type": "application/json",
    }


def _parse_date(item: Dict[str, Any]) -> Optional[str]:
    """Parse date from ScrapeCreators Twitter item to YYYY-MM-DD."""
    # Try created_at string (e.g. "Wed Oct 10 20:19:24 +0000 2018")
    created_at = item.get("created_at")
    if created_at and isinstance(created_at, str):
        try:
            dt = datetime.strptime(created_at, "%a %b %d %H:%M:%S %z %Y")
            return dt.strftime("%Y-%m-%d")
        except (ValueError, TypeError):
            pass

    # Try unix timestamp
    ts = item.get("timestamp") or item.get("created_at_timestamp")
    if ts:
        try:
            dt = datetime.fromtimestamp(int(ts), tz=timezone.utc)
            return dt.strftime("%Y-%m-%d")
        except (ValueError, TypeError, OSError):
            pass

    # Try ISO format
    for key in ("created_at", "date"):
        val = item.get(key)
        if val and isinstance(val, str):
            try:
                dt = datetime.fromisoformat(val.replace("Z", "+00:00"))
                return dt.strftime("%Y-%m-%d")
            except (ValueError, TypeError):
                pass

    return None


def search_x(
    topic: str,
    from_date: str,
    to_date: str,
    depth: str = "default",
    token: str = None,
) -> Dict[str, Any]:
    """Search X/Twitter via ScrapeCreators API.

    Returns:
        Dict with 'items' list (in normalize_x_items format) and optional 'error'.
    """
    if not token:
        return {"items": [], "error": "No SCRAPECREATORS_API_KEY configured"}

    if not _requests:
        return {"items": [], "error": "requests library not installed"}

    config = DEPTH_CONFIG.get(depth, DEPTH_CONFIG["default"])
    core_topic = _extract_core_subject(topic)

    _log(f"Searching X for '{core_topic}' (depth={depth}, count={config['results_per_page']})")

    try:
        resp = _requests.get(
            f"{SCRAPECREATORS_BASE}/search/tweets",
            params={"query": core_topic, "sort_by": "relevance"},
            headers=_sc_headers(token),
            timeout=30,
        )
        resp.raise_for_status()
        data = resp.json()
    except Exception as e:
        _log(f"ScrapeCreators error: {e}")
        return {"items": [], "error": f"{type(e).__name__}: {e}"}

    raw_items = data.get("tweets") or data.get("data") or data.get("results") or []
    raw_items = raw_items[:config["results_per_page"]]

    items = []
    for i, raw in enumerate(raw_items):
        tweet_id = str(raw.get("id") or raw.get("tweet_id") or raw.get("id_str") or f"sc-x-{i}")
        text = raw.get("full_text") or raw.get("text") or ""
        user = raw.get("user") or raw.get("author") or {}
        author_handle = user.get("screen_name") or user.get("username") or ""

        # Engagement metrics
        likes = raw.get("favorite_count") or raw.get("likes") or 0
        retweets = raw.get("retweet_count") or raw.get("retweets") or 0
        replies = raw.get("reply_count") or raw.get("replies") or 0
        quotes = raw.get("quote_count") or raw.get("quotes") or 0

        date_str = _parse_date(raw)
        relevance = _compute_relevance(core_topic, text)

        url = ""
        if author_handle and tweet_id and not tweet_id.startswith("sc-x-"):
            url = f"https://x.com/{author_handle}/status/{tweet_id}"

        items.append({
            "id": tweet_id,
            "text": text,
            "url": url,
            "author_handle": author_handle,
            "date": date_str,
            "engagement": {
                "likes": likes,
                "reposts": retweets,
                "replies": replies,
                "quotes": quotes,
            },
            "relevance": relevance,
            "why_relevant": f"X: @{author_handle}: {text[:60]}" if text else f"X: {core_topic}",
        })

    # Date filter
    in_range = [i for i in items if i["date"] and from_date <= i["date"] <= to_date]
    out_of_range = len(items) - len(in_range)
    if in_range:
        items = in_range
        if out_of_range:
            _log(f"Filtered {out_of_range} tweets outside date range")
    else:
        _log(f"No tweets within date range, keeping all {len(items)}")

    # Sort by engagement (likes + retweets)
    items.sort(key=lambda x: (x["engagement"]["likes"] + x["engagement"]["reposts"]), reverse=True)

    _log(f"Found {len(items)} tweets")
    return {"items": items}


def parse_x_response(response: Dict[str, Any]) -> List[Dict[str, Any]]:
    """Parse search response to normalized format."""
    return response.get("items", [])