import os
import re
import nntplib
from dotenv import load_dotenv
from db import get_conn

# ================= CONFIG =================
GROUP = "alt.binaries.e-book.magazines"
SUBJECT_KEY = "PC Pro 2011-07.pdf"
RAW_DIR = r"downloads/raw"
# ==========================================

load_dotenv()
EWEKA_USER = os.getenv("EWEKA_USER")
EWEKA_PASS = os.getenv("EWEKA_PASS")

os.makedirs(RAW_DIR, exist_ok=True)

# --- DB: najdi články ---
conn = get_conn()
cur = conn.cursor()

cur.execute("""
    SELECT article_number, metadata->>'subject'
    FROM articles
    WHERE newsgroup = %s
      AND metadata->>'subject' LIKE %s
    ORDER BY article_number
""", (GROUP, f"%{SUBJECT_KEY}%"))

rows = cur.fetchall()

# --- parse part number from subject ---
part_re = re.compile(r"\((\d+)\s*/\s*\d+\)")
parts = []

for art_num, subject in rows:
    m = part_re.search(subject or "")
    if not m:
        raise RuntimeError(f"Cannot parse part number from subject: {subject}")
    part_no = int(m.group(1))
    parts.append((part_no, art_num))

parts.sort(key=lambda x: x[0])

print(f"📦 Parts to download: {len(parts)}")

# --- NNTP download ---
with nntplib.NNTP_SSL(
    "news.eweka.nl",
    563,
    EWEKA_USER,
    EWEKA_PASS,
    readermode=True
) as nntp:

    nntp.group(GROUP)

    for part_no, art_num in parts:
        out_path = os.path.join(RAW_DIR, f"part_{part_no:03d}.raw")

        if os.path.exists(out_path):
            continue

        print(f"⬇️  Downloading RAW part {part_no} (article {art_num})")

        _, info = nntp.body(art_num)

        with open(out_path, "wb") as f:
            for line in info.lines:
                f.write(line)
                f.write(b"\n")

print("🎉 DONE – RAW NNTP data stored")