#!/usr/bin/env python3
"""check-infra-pins.py — the MONTHLY re-test's infrastructure half (R-838, 2026-10-04).

The box's three built-in containers (traefik, cloudflared, filebrowser) are pinned in internal/infra/infra.go and are
NOT catalog templates, so retest-floating.py never sees them. Before R-838 cloudflared sat four months behind and
nothing noticed. This script prints, for each pin, the newest upstream release in the SAME channel (traefik v3.x,
cloudflared YYYY.M.P, filebrowser N.N.N-stable — never a beta) and says BEHIND when the pin is older.

It REPORTS; it changes nothing. A raise is a controller release (edit the constant, read the release notes between the
two versions for breaking changes, prove it on 9202 then both demo boxes: the runbook's "Infrastructure pins" section).
Network: Docker Hub's public tag API only. Exit 0 = all current, 1 = at least one BEHIND, 2 = could not check.

Run: python3 scripts/check-infra-pins.py
"""
import json
import os
import re
import sys
import urllib.request

HERE = os.path.dirname(os.path.abspath(__file__))
INFRA = os.path.join(HERE, "..", "internal", "infra", "infra.go")

CHANNELS = {
    "TraefikImage": ("library/traefik", re.compile(r"^v3\.(\d+)\.(\d+)$")),
    "CloudflaredImage": ("cloudflare/cloudflared", re.compile(r"^(\d{4})\.(\d+)\.(\d+)$")),
    "FileBrowserImage": ("gtstef/filebrowser", re.compile(r"^(\d+)\.(\d+)\.(\d+)-stable$")),
}


def pins():
    src = open(INFRA).read()
    out = {}
    for const in CHANNELS:
        m = re.search(r'\b%s\s*=\s*"([^"]+)"' % const, src)
        if not m:
            raise SystemExit(f"check-infra-pins: {const} not found in {INFRA}")
        out[const] = m.group(1)
    return out


def tags(repo):
    url = f"https://hub.docker.com/v2/repositories/{repo}/tags?page_size=100&ordering=last_updated"
    names = []
    for _ in range(3):  # three pages are plenty for "the newest in a channel"
        with urllib.request.urlopen(url, timeout=30) as r:
            d = json.load(r)
        names += [t["name"] for t in d.get("results", [])]
        url = d.get("next")
        if not url:
            break
    return names


def key(m):
    return tuple(int(x) for x in m.groups())


def main():
    rc = 0
    for const, image in pins().items():
        repo, rx = CHANNELS[const]
        tag = image.split(":", 1)[1]
        cur = rx.match(tag)
        try:
            cands = [m for m in (rx.match(t) for t in tags(repo)) if m]
        except Exception as e:  # noqa: BLE001 — a report, not a gate
            print(f"{const:17} {image:40} could not check: {e}")
            rc = max(rc, 2)
            continue
        if not cands or not cur:
            print(f"{const:17} {image:40} no comparable tag found")
            rc = max(rc, 2)
            continue
        newest = max(cands, key=key)
        state = "current" if key(newest) <= key(cur) else "BEHIND"
        if state == "BEHIND":
            rc = max(rc, 1)
        print(f"{const:17} {image:40} newest {newest.string:16} {state}")
    return rc


if __name__ == "__main__":
    sys.exit(main())