#!/usr/bin/env python3
"""Backfill seen_articles table from existing clusters.

Run once after deploying the seen_articles feature:
  docker exec -it news-mcp python3 /app/scripts/backfill_seen_articles.py

Or locally against the repo DB:
  python3 scripts/backfill_seen_articles.py
"""
import json
import sqlite3
import sys
from datetime import datetime, timezone
from urllib.parse import urlparse


def _article_key(article: dict) -> str:
    url = str(article.get("url") or "").strip()
    if not url:
        return str(article.get("title") or "")
    try:
        parsed = urlparse(url)
        parts = [p for p in parsed.path.split("/") if p]
        if parts:
            return parts[-1]
    except Exception:
        pass
    return url


def main(db_path: str = "./data/news.sqlite"):
    conn = sqlite3.connect(db_path)

    # Ensure the table exists
    conn.execute("""
        CREATE TABLE IF NOT EXISTS seen_articles (
            article_key TEXT PRIMARY KEY,
            cluster_id  TEXT NOT NULL,
            first_seen  TEXT NOT NULL,
            url         TEXT NOT NULL DEFAULT ''
        )
    """)

    rows = conn.execute("SELECT cluster_id, payload FROM clusters").fetchall()
    now = datetime.now(timezone.utc).isoformat()
    added = 0
    skipped = 0

    for cluster_id, payload_json in rows:
        try:
            payload = json.loads(payload_json)
        except json.JSONDecodeError:
            skipped += 1
            continue
        for art in payload.get("articles", []):
            akey = _article_key(art)
            if not akey:
                continue
            art_url = str(art.get("url") or "").strip()
            try:
                conn.execute(
                    "INSERT OR IGNORE INTO seen_articles(article_key, cluster_id, first_seen, url) VALUES(?,?,?,?)",
                    (akey, cluster_id, now, art_url),
                )
                if conn.execute("SELECT changes()").fetchone()[0] > 0:
                    added += 1
            except Exception as e:
                print(f"  ERROR: {e}", file=sys.stderr)
                skipped += 1

    conn.commit()
    total = conn.execute("SELECT count(*) FROM seen_articles").fetchone()[0]
    conn.close()
    print(f"Backfill complete: added={added} skipped={skipped} total_seen={total}")


if __name__ == "__main__":
    db = sys.argv[1] if len(sys.argv) > 1 else "./data/news.sqlite"
    main(db)