"""ETERNAL pub.dev firehose: /api/packages page-walk + latest archive scan.

Anonymous. Cursor = page number (next_url), walks a slice of pages per cycle,
resets to 1 when list exhausted (new packages appear at head). tar.gz scan
via key_patterns.scan_text. mark_seen ONLY on success.
"""
import os
KF_BASE = os.path.dirname(os.path.abspath(__file__))
os.makedirs(os.path.join(KF_BASE, "data"), exist_ok=True)
import hashlib

import io
import sqlite3

import sys
import tarfile
import threading
import time

import requests

DB = os.environ.get("KF_DB") or os.path.join(KF_BASE, "data/keys.db")
LOG = os.path.join(KF_BASE, "data/pubdev_eternal.log")
CURSOR_FILE = os.path.join(KF_BASE, "data/pubdev_cursor.txt")
SEEN_FILE = os.path.join(KF_BASE, "data/pubdev_seen.txt")
N_THREADS = 4
PAGES_PER_CYCLE = 5
TAR_CAP = 8 * 1024 * 1024
FILE_CAP = 500_000
SLEEP = 90

from key_patterns import scan_text

GARBAGE = ("xxxx", "your", "YOUR", "EXAMPLE", "example", "n0tr3al",
           "placeholder", "CHANGEME", "changeme", "dummy", "DUMMY",
           "abcdefghijklmnopqrst", "1234567890abcdef")

SCAN_EXT = (".dart", ".json", ".yaml", ".yml", ".env", ".sh", ".py", ".js",
            ".ts", ".cfg", ".ini", ".md", ".txt", ".gradle", ".lock")

UA = {"User-Agent": "keyfarm-research/1.0 (package security scan)"}


def log(msg):
    line = f"[{time.strftime('%Y-%m-%d %H:%M:%S')}] {msg}\n"
    with open(LOG, "a", encoding="utf-8") as f:
        f.write(line)


conn = sqlite3.connect(DB, timeout=120, check_same_thread=False,
                       isolation_level=None)
lock = threading.Lock()
total = 0


def db_add(key, prov, repo):
    global total
    with lock:
        conn.execute(
            "INSERT INTO keys (hash, val, prov, status, found, repo) "
            "VALUES (?,?,?,?,?,?) "
            "ON CONFLICT(hash) DO UPDATE SET status='NEW', "
            "found=excluded.found, repo=excluded.repo "
            "WHERE keys.status IN ('DEAD','ERR')",
            (hashlib.sha1(key.encode()).hexdigest()[:16],
             key, prov, "NEW", "pubdev", repo))
        total += 1


def load_cursor():
    try:
        with open(CURSOR_FILE, encoding="utf-8") as f:
            return int(f.read().strip() or 1)
    except Exception:
        return 1


def save_cursor(c):
    with open(CURSOR_FILE, "w", encoding="utf-8") as f:
        f.write(str(c))


def load_seen():
    s = set()
    try:
        with open(SEEN_FILE, encoding="utf-8") as f:
            for line in f:
                s.add(line.strip())
    except Exception:
        pass
    return s


seen = load_seen()


def mark_seen(p):
    seen.add(p)
    with open(SEEN_FILE, "a", encoding="utf-8") as f:
        f.write(p + "\n")


def work(name):
    """Fetch package meta -> latest tar.gz, scan. -1 on final fail."""
    n = 0
    for attempt in (1, 2):
        try:
            r = requests.get(f"https://pub.dev/api/packages/{name}",
                             headers=UA, timeout=20)
            if r.status_code == 404:
                return 0
            if r.status_code != 200:
                raise RuntimeError(f"http {r.status_code}")
            au = r.json().get("latest", {}).get("archive_url")
            if not au:
                return 0
            if not au.startswith("https"):
                au = "https://pub.dev" + au
            r2 = requests.get(au, headers=UA, timeout=30)
            if r2.status_code != 200:
                raise RuntimeError(f"arch http {r2.status_code}")
            if len(r2.content) > TAR_CAP:
                return 0
            tf = tarfile.open(fileobj=io.BytesIO(r2.content), mode="r:gz")
            for m in tf.getmembers():
                if not m.isfile() or m.size > FILE_CAP:
                    continue
                fn = m.name.lower()
                if not any(fn.endswith(e) for e in SCAN_EXT):
                    continue
                ef = tf.extractfile(m)
                if ef is None:
                    continue
                data = ef.read()
                text = data.decode("utf-8", errors="ignore")
                for prov, key in scan_text(text):
                    if isinstance(key, tuple):
                        key = key[0]
                    if any(g in key for g in GARBAGE) or len(key) < 30:
                        continue
                    db_add(key, prov, f"pub:{name}")
                    n += 1
            return n
        except Exception:
            if attempt == 2:
                log(f"  pkg-err {name}")
                return -1
            time.sleep(3)
    return -1


def cycle():
    global total
    total = 0
    page = load_cursor()
    names = []
    exhausted = False
    for _ in range(PAGES_PER_CYCLE):
        url = f"https://pub.dev/api/packages?page={page}"
        for attempt in (1, 2):
            try:
                r = requests.get(url, headers=UA, timeout=25)
                if r.status_code != 200:
                    raise RuntimeError(f"http {r.status_code}")
                d = r.json()
                pkgs = d.get("packages") or []
                for pk in pkgs:
                    nm = pk.get("name")
                    if nm and nm not in seen:
                        names.append(nm)
                nxt = d.get("next_url")
                if not nxt:
                    exhausted = True
                break
            except Exception as e:
                if attempt == 2:
                    log(f"list-err page={page} {type(e).__name__}")
                    return
                time.sleep(5)
        if exhausted:
            break
        page += 1

    if exhausted:
        save_cursor(1)
    else:
        save_cursor(page)

    ok = fail = 0
    from concurrent.futures import ThreadPoolExecutor, as_completed
    with ThreadPoolExecutor(max_workers=N_THREADS) as ex:
        futs = {ex.submit(work, nm): nm for nm in names}
        for fut in as_completed(futs):
            nm = futs[fut]
            try:
                res = fut.result()
            except Exception:
                res = -1
            if res == -1:
                fail += 1
            else:
                ok += 1
                mark_seen(nm)

    log(f"cycle: page_next={load_cursor()} pkgs={len(names)} ok={ok} "
        f"fail={fail} +{total} keys")


def main():
    log("pubdev_eternal started")
    if "--once" in sys.argv:
        cycle()
        return
    while True:
        try:
            cycle()
        except Exception as e:
            log(f"cycle-err {type(e).__name__}: {e}")
        time.sleep(SLEEP)


if __name__ == "__main__":
    main()