import { Buffer } from "node:buffer";

import { type UniDeskConfig } from "./config";
import { runSshCommandCapture } from "./ssh";

interface RemoteGcOptions {
  confirm: boolean;
  journal: boolean;
  journalTargetBytes: number;
  dockerLogs: boolean;
  dockerLogMaxBytes: number;
  buildCache: boolean;
  buildCacheUntil: string;
  tmp: boolean;
  tmpMinAgeHours: number;
  aptCache: boolean;
  coreDumps: boolean;
  coreDumpMinAgeHours: number;
  hwlabRegistry: boolean;
  registryGcOnly: boolean;
  registryKeepPerRepo: number;
  registryMinAgeHours: number;
  jobId?: string;
  limit: number;
  resultLimit: number;
  full: boolean;
}

const DEFAULT_REMOTE_OPTIONS: RemoteGcOptions = {
  confirm: false,
  journal: true,
  journalTargetBytes: 512 * 1024 * 1024,
  dockerLogs: true,
  dockerLogMaxBytes: 50 * 1024 * 1024,
  buildCache: true,
  buildCacheUntil: "24h",
  tmp: true,
  tmpMinAgeHours: 24,
  aptCache: true,
  coreDumps: true,
  coreDumpMinAgeHours: 1,
  hwlabRegistry: false,
  registryGcOnly: false,
  registryKeepPerRepo: 20,
  registryMinAgeHours: 48,
  limit: 50,
  resultLimit: 50,
  full: false,
};

export async function runRemoteGcCommand(config: UniDeskConfig, providerId: string | undefined, action: string | undefined, args: string[]): Promise<unknown> {
  if (providerId === undefined || providerId.length === 0) {
    return {
      ok: false,
      error: "gc-remote-provider-required",
      usage: "bun scripts/cli.ts gc remote <providerId> plan|run|status [--confirm]",
    };
  }
  const subaction = action ?? "plan";
  const options = parseRemoteGcOptions(args);
  if (subaction === "plan" || subaction === "dry-run") return await runRemoteGc(config, providerId, "plan", options);
  if (subaction === "status") return await runRemoteGc(config, providerId, "status", options);
  if (subaction === "run") {
    if (!options.confirm) {
      return {
        ok: false,
        error: "gc-remote-run-requires-confirm",
        dryRun: true,
        mutation: false,
        requiredFlag: "--confirm",
        planCommand: `bun scripts/cli.ts gc remote ${providerId} plan`,
        runCommand: `bun scripts/cli.ts gc remote ${providerId} run --confirm`,
      };
    }
    return await runRemoteGc(config, providerId, "run", options);
  }
  return {
    ok: false,
    error: "unsupported-gc-remote-action",
    action: subaction,
    supportedActions: ["plan", "run", "status"],
  };
}

function parseRemoteGcOptions(args: string[]): RemoteGcOptions {
  const options = { ...DEFAULT_REMOTE_OPTIONS };
  for (let index = 0; index < args.length; index += 1) {
    const arg = args[index] ?? "";
    if (arg === "--confirm") {
      options.confirm = true;
    } else if (arg === "--dry-run") {
      // accepted for plan compatibility
    } else if (arg === "--journal-target-size") {
      options.journalTargetBytes = parseSizeOption(arg, args[++index]);
    } else if (arg === "--docker-log-max-bytes") {
      options.dockerLogMaxBytes = parseSizeOption(arg, args[++index]);
    } else if (arg === "--build-cache-until") {
      const value = args[++index];
      if (!value || !/^\d+(s|m|h|d)$/u.test(value)) throw new Error(`${arg} must look like 24h, 7d, 30m or 60s`);
      options.buildCacheUntil = value;
    } else if (arg === "--tmp-min-age-hours") {
      options.tmpMinAgeHours = parseNonNegativeNumber(arg, args[++index]);
    } else if (arg === "--core-dump-min-age-hours") {
      options.coreDumpMinAgeHours = parseNonNegativeNumber(arg, args[++index]);
    } else if (arg === "--registry-keep-per-repo") {
      const value = parseNonNegativeNumber(arg, args[++index]);
      if (!Number.isInteger(value) || value < 1) throw new Error("--registry-keep-per-repo must be an integer >= 1");
      options.registryKeepPerRepo = Math.min(value, 50);
    } else if (arg === "--registry-min-age-hours") {
      const value = parseNonNegativeNumber(arg, args[++index]);
      options.registryMinAgeHours = value;
    } else if (arg === "--job-id") {
      const value = args[++index];
      if (!value || !/^[A-Za-z0-9._-]{1,128}$/u.test(value)) throw new Error("--job-id must be a safe job id");
      options.jobId = value;
    } else if (arg === "--limit") {
      const value = parseNonNegativeNumber(arg, args[++index]);
      if (!Number.isInteger(value) || value <= 0) throw new Error("--limit must be a positive integer");
      options.limit = Math.min(value, 5000);
    } else if (arg === "--result-limit") {
      const value = parseNonNegativeNumber(arg, args[++index]);
      if (!Number.isInteger(value) || value <= 0) throw new Error("--result-limit must be a positive integer");
      options.resultLimit = Math.min(value, 5000);
    } else if (arg === "--no-journal") {
      options.journal = false;
    } else if (arg === "--no-docker-logs") {
      options.dockerLogs = false;
    } else if (arg === "--no-build-cache") {
      options.buildCache = false;
    } else if (arg === "--no-tmp") {
      options.tmp = false;
    } else if (arg === "--no-apt-cache") {
      options.aptCache = false;
    } else if (arg === "--no-core-dumps") {
      options.coreDumps = false;
    } else if (arg === "--include-hwlab-registry") {
      options.hwlabRegistry = true;
    } else if (arg === "--registry-gc-only") {
      options.hwlabRegistry = true;
      options.registryGcOnly = true;
    } else if (arg === "--full" || arg === "--raw") {
      options.full = true;
    } else {
      throw new Error(`unknown gc remote option: ${arg}`);
    }
  }
  return options;
}

function parseNonNegativeNumber(name: string, raw: string | undefined): number {
  const value = Number(raw);
  if (!Number.isFinite(value) || value < 0) throw new Error(`${name} must be a non-negative number`);
  return value;
}

function parseSizeOption(name: string, raw: string | undefined): number {
  const value = parseSize(raw ?? "");
  if (value === null || value <= 0) throw new Error(`${name} must be a positive size such as 512M, 1GiB or 50000000`);
  return value;
}

function parseSize(raw: string): number | null {
  const match = raw.trim().match(/^(\d+(?:\.\d+)?)\s*(b|k|kb|kib|m|mb|mib|g|gb|gib)?$/iu);
  if (!match) return null;
  const value = Number(match[1]);
  const unit = (match[2] ?? "b").toLowerCase();
  const multiplier =
    unit === "g" || unit === "gb" || unit === "gib" ? 1024 ** 3
      : unit === "m" || unit === "mb" || unit === "mib" ? 1024 ** 2
        : unit === "k" || unit === "kb" || unit === "kib" ? 1024
          : 1;
  const bytes = Math.floor(value * multiplier);
  return Number.isFinite(bytes) ? bytes : null;
}

async function runRemoteGc(config: UniDeskConfig, providerId: string, action: "plan" | "run" | "status", options: RemoteGcOptions): Promise<unknown> {
  const scriptConfig = Buffer.from(JSON.stringify({ providerId, action, options }), "utf8").toString("base64");
  const result = await runSshCommandCapture(config, providerId, ["py"], remoteGcPython(scriptConfig));
  if (result.exitCode !== 0) {
    return {
      ok: false,
      error: "gc-remote-command-failed",
      providerId,
      action: `gc remote ${action}`,
      exitCode: result.exitCode,
      stdoutTail: result.stdout.slice(-4000),
      stderrTail: result.stderr.slice(-4000),
    };
  }
  try {
    return JSON.parse(result.stdout) as unknown;
  } catch (error) {
    return {
      ok: false,
      error: "gc-remote-invalid-json",
      providerId,
      action: `gc remote ${action}`,
      message: error instanceof Error ? error.message : String(error),
      stdoutTail: result.stdout.slice(-4000),
      stderrTail: result.stderr.slice(-4000),
    };
  }
}

function remoteGcPython(configBase64: string): string {
  return String.raw`
import base64
import json
import os
import re
import shutil
import subprocess
import sys
import time
import urllib.error
import urllib.parse
import urllib.request

CONFIG = json.loads(base64.b64decode("${configBase64}").decode("utf-8"))
PROVIDER_ID = str(CONFIG.get("providerId") or "")
ACTION = str(CONFIG.get("action") or "plan")
OPTIONS = CONFIG.get("options") or {}

TMP_PREFIX_ALLOWLIST = [
    "hwlab-agent-",
    "hwlab-cd-",
    "hwlab-cli-cicd-",
    "hwlab-codeagent-trace",
    "hwlab-desired-state-",
    "hwlab-g14-",
    "hwlab-main-",
    "hwlab-merge-",
    "hwlab-pr",
    "hwlab-refresh-",
    "hwlab-remote-",
    "hwlab-ts-check",
    "hwlab-bun-runtime-check-",
    "hwlab-v02-",
    "playwright-artifacts-",
    "playwright_chromiumdev_profile-",
    "unidesk-apply-patch-v2-perf-",
    "unidesk-clean-",
    "unidesk-code-queue",
    "unidesk-hwlab-cd-",
    "unidesk-pr",
    "unidesk-tran-runner",
    "bunx-",
    "codex-app-schema",
    "codex-app-ts",
    "marked-",
    "node-compile-cache",
]

TMP_EXACT_PROTECT = set([
    "/tmp/codex-apply-patch",
    "/tmp/codex-ipc",
    "/tmp/tmux-0",
    "/tmp/snap-private-tmp",
])

CORE_DUMP_DIR_ALLOWLIST = set([
    "/root/unidesk",
])

REGISTRY_REPOSITORY_ROOT = "/var/lib/hwlab/registry/docker/registry/v2/repositories"
REGISTRY_ROOT = "/var/lib/hwlab/registry"
REGISTRY_PROTECTED_TAGS = set([
    "latest",
    "16-alpine",
    "20-bookworm-slim",
    "node22-alpine-v1",
    "node22-alpine-bun-v1",
    "sidecar",
    "1b99888d3dae",
])

EXPECTED_G14_NODE = "ubuntu-rog-zephyrus-g14-ga401iv-ga401iv"
REMOTE_GC_JOB_DIR = "/tmp/unidesk-gc-remote/jobs"

def now_iso():
    return time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime())

def command(cmd, timeout=10):
    try:
        p = subprocess.run(cmd, text=True, capture_output=True, timeout=timeout)
        return {"exitCode": p.returncode, "stdout": p.stdout, "stderr": p.stderr, "timedOut": False}
    except subprocess.TimeoutExpired as exc:
        return {
            "exitCode": None,
            "stdout": exc.stdout or "",
            "stderr": exc.stderr or ("timed out after %ss" % timeout),
            "timedOut": True,
        }
    except Exception as exc:
        return {"exitCode": None, "stdout": "", "stderr": str(exc), "timedOut": False}

def bounded(result):
    return {
        "exitCode": result.get("exitCode"),
        "timedOut": bool(result.get("timedOut")),
        "stdoutTail": str(result.get("stdout") or "")[-2000:],
        "stderrTail": str(result.get("stderr") or "")[-2000:],
    }

def job_id_or_none():
    raw = str(OPTIONS.get("jobId") or "")
    if raw and re.match(r"^[A-Za-z0-9._-]{1,128}$", raw):
        return raw
    return None

def job_paths(job_id):
    os.makedirs(REMOTE_GC_JOB_DIR, exist_ok=True)
    return {
        "state": os.path.join(REMOTE_GC_JOB_DIR, "%s.json" % job_id),
        "log": os.path.join(REMOTE_GC_JOB_DIR, "%s.log" % job_id),
    }

def write_json_atomic(path, payload):
    tmp = "%s.tmp.%s" % (path, os.getpid())
    with open(tmp, "w", encoding="utf-8") as handle:
        json.dump(payload, handle, ensure_ascii=False, indent=2)
        handle.write("\n")
    os.replace(tmp, path)

def read_file_tail(path, limit=12000):
    try:
        size = os.path.getsize(path)
        with open(path, "rb") as handle:
            if size > limit:
                handle.seek(size - limit)
            data = handle.read()
        return data.decode("utf-8", errors="replace")
    except OSError:
        return ""

def remote_gc_job_status():
    job_id = job_id_or_none()
    if not job_id:
        return {
            "ok": False,
            "error": "gc-remote-status-requires-job-id",
            "requiredFlag": "--job-id",
        }
    paths = job_paths(job_id)
    if not os.path.isfile(paths["state"]):
        return {
            "ok": False,
            "error": "gc-remote-job-not-found",
            "jobId": job_id,
            "statePath": paths["state"],
            "logTail": read_file_tail(paths["log"]),
        }
    try:
        with open(paths["state"], "r", encoding="utf-8") as handle:
            payload = json.load(handle)
    except Exception as exc:
        return {
            "ok": False,
            "error": "gc-remote-job-state-invalid",
            "jobId": job_id,
            "message": str(exc),
            "statePath": paths["state"],
            "logTail": read_file_tail(paths["log"]),
        }
    payload["logTail"] = read_file_tail(paths["log"])
    return payload

def path_size(path):
    try:
        if os.path.islink(path) or os.path.isfile(path):
            return os.lstat(path).st_size
        if not os.path.isdir(path):
            return 0
        total = 0
        for root, dirs, files in os.walk(path):
            for name in files:
                child = os.path.join(root, name)
                try:
                    total += os.lstat(child).st_size
                except OSError:
                    pass
            for name in dirs:
                child = os.path.join(root, name)
                try:
                    if os.path.islink(child):
                        total += os.lstat(child).st_size
                except OSError:
                    pass
        return total
    except OSError:
        return 0

def du_size(path, timeout=20):
    if not os.path.exists(path):
        return None
    result = command(["du", "-sxB1", path], timeout)
    if result["exitCode"] != 0:
        return path_size(path)
    text = result["stdout"].strip()
    if not text:
        return 0
    try:
        return int(text.split()[0])
    except Exception:
        return path_size(path)

def allocated_file_size(path):
    try:
        stat = os.stat(path)
        blocks = getattr(stat, "st_blocks", 0)
        if blocks:
            return int(blocks) * 512
        return int(stat.st_size)
    except OSError:
        return 0

def df_snapshot():
    result = command(["df", "-B1", "-P", "/"], 5)
    if result["exitCode"] != 0:
        return None
    lines = result["stdout"].strip().splitlines()
    if len(lines) < 2:
        return None
    parts = lines[1].split()
    if len(parts) < 6:
        return None
    return {
        "filesystem": parts[0],
        "sizeBytes": int(parts[1]),
        "usedBytes": int(parts[2]),
        "availableBytes": int(parts[3]),
        "usePercent": int(parts[4].replace("%", "")),
        "mount": parts[5],
    }

def fmt_bytes(value):
    units = ["B", "KiB", "MiB", "GiB", "TiB"]
    size = float(max(0, int(value or 0)))
    idx = 0
    while size >= 1024 and idx < len(units) - 1:
        size /= 1024.0
        idx += 1
    return ("%0.0f %s" if size >= 10 or idx == 0 else "%0.1f %s") % (size, units[idx])

def parse_journal_usage(text):
    m = re.search(r"take up\s+([0-9.]+)\s*([KMGT]?)(?:i?B|B)?", text, re.I)
    if not m:
        return None
    mult = {"": 1, "K": 1024, "M": 1024**2, "G": 1024**3, "T": 1024**4}.get(m.group(2).upper(), 1)
    return int(float(m.group(1)) * mult)

def parse_docker_human_size(raw):
    raw = str(raw).split("(")[0].strip()
    m = re.match(r"^([0-9.]+)\s*([KMGT]?B)$", raw, re.I)
    if not m:
        return None
    mult = {"B": 1, "KB": 1000, "MB": 1000**2, "GB": 1000**3, "TB": 1000**4}.get(m.group(2).upper(), 1)
    return int(float(m.group(1)) * mult)

def parse_docker_build_cache(text):
    for line in text.splitlines():
        if not line.startswith("Build Cache"):
            continue
        match = re.match(r"^Build Cache\s+\S+\s+\S+\s+(\S+)\s+(\S+)", line.strip())
        if not match:
            continue
        size = parse_docker_human_size(match.group(1))
        reclaim = parse_docker_human_size(match.group(2))
        if size is None or reclaim is None:
            return None
        return {"sizeBytes": size, "reclaimableBytes": reclaim}
    return None

def docker_containers():
    ps = command(["docker", "ps", "-qa", "--no-trunc"], 5)
    if ps["exitCode"] != 0 or not ps["stdout"].strip():
        return []
    ids = ps["stdout"].split()
    inspect = command(["docker", "inspect"] + ids, 10)
    if inspect["exitCode"] != 0 or not inspect["stdout"].strip():
        return []
    try:
        data = json.loads(inspect["stdout"])
    except Exception:
        return []
    rows = []
    for item in data:
        cfg = item.get("Config") or {}
        rows.append({
            "id": str(item.get("Id") or ""),
            "name": str(item.get("Name") or "").lstrip("/"),
            "image": str(cfg.get("Image") or item.get("Image") or ""),
            "logPath": str(item.get("LogPath") or ""),
        })
    return [row for row in rows if row["id"]]

def cluster_preflight():
    node_cmd = command(["sh", "-lc", "KUBECONFIG=/etc/rancher/k3s/k3s.yaml kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{\"\\n\"}{end}' 2>/dev/null"], 10)
    pods_cmd = command(["sh", "-lc", "KUBECONFIG=/etc/rancher/k3s/k3s.yaml kubectl get pods -n hwlab-dev --no-headers 2>/dev/null | wc -l"], 10)
    nodes = [line.strip() for line in node_cmd["stdout"].splitlines() if line.strip()]
    expected = EXPECTED_G14_NODE if PROVIDER_ID.upper() == "G14" else None
    ok = True
    reason = "ok"
    if expected is not None and expected not in nodes:
        ok = False
        reason = "expected-g14-node-missing"
    return {
        "ok": ok,
        "reason": reason,
        "providerId": PROVIDER_ID,
        "hostname": command(["hostname"], 5)["stdout"].strip(),
        "expectedNode": expected,
        "nodes": nodes,
        "nodeCommand": bounded(node_cmd),
        "hwlabDevPodCount": int(pods_cmd["stdout"].strip() or "0") if pods_cmd["exitCode"] == 0 else None,
        "hwlabDevPodCommand": bounded(pods_cmd),
    }

def active_hwlab_ci_writes():
    result = command(["sh", "-lc", "KUBECONFIG=/etc/rancher/k3s/k3s.yaml kubectl get pipelinerun,taskrun -n hwlab-ci --no-headers 2>/dev/null | awk '$2 != \"True\" && $2 != \"False\" {print}' | head -40"], 15)
    lines = [line for line in (result.get("stdout") or "").splitlines() if line.strip()]
    return {"ok": result["exitCode"] == 0, "activeCount": len(lines), "activePreview": lines, "command": bounded(result)}

def active_hwlab_ci_jobs():
    result = command(["sh", "-lc", "KUBECONFIG=/etc/rancher/k3s/k3s.yaml kubectl get jobs -n hwlab-ci --no-headers 2>/dev/null | awk '$2 != \"Complete\" && $2 != \"Failed\" {print}' | head -40"], 15)
    lines = [line for line in (result.get("stdout") or "").splitlines() if line.strip()]
    return {"ok": result["exitCode"] == 0, "activeCount": len(lines), "activePreview": lines, "command": bounded(result)}

def wait_no_active_hwlab_ci(timeout=180):
    deadline = time.time() + timeout
    last = None
    while time.time() < deadline:
        writes = active_hwlab_ci_writes()
        jobs = active_hwlab_ci_jobs()
        last = {"writes": writes, "jobs": jobs}
        if writes.get("ok") and jobs.get("ok") and int(writes.get("activeCount") or 0) == 0 and int(jobs.get("activeCount") or 0) == 0:
            return {"ok": True, "last": last}
        time.sleep(5)
    return {"ok": False, "last": last}

def kubectl_json(args, timeout=20):
    result = command(["env", "KUBECONFIG=/etc/rancher/k3s/k3s.yaml", "kubectl"] + args + ["-o", "json"], timeout)
    if result["exitCode"] != 0:
        return None
    try:
        return json.loads(result["stdout"] or "{}")
    except Exception:
        return None

def kctl(args, timeout=30):
    return command(["env", "KUBECONFIG=/etc/rancher/k3s/k3s.yaml", "kubectl"] + args, timeout)

def workload_image_refs():
    result = command(["sh", "-lc", "KUBECONFIG=/etc/rancher/k3s/k3s.yaml kubectl get deploy,sts,ds,pod -A -o jsonpath='{range .items[*]}{range .spec.containers[*]}{.image}{\"\\n\"}{end}{range .spec.initContainers[*]}{.image}{\"\\n\"}{end}{range .spec.template.spec.containers[*]}{.image}{\"\\n\"}{end}{range .spec.template.spec.initContainers[*]}{.image}{\"\\n\"}{end}{end}' 2>/dev/null | sort -u"], 30)
    refs = set()
    digests = set()
    for image in (result.get("stdout") or "").splitlines():
        image = image.strip()
        if not image.startswith("127.0.0.1:5000/"):
            continue
        ref = image.split("127.0.0.1:5000/", 1)[1]
        if "@sha256:" in ref:
            repo, digest = ref.split("@", 1)
            refs.add((repo, "@" + digest))
            digests.add("sha256:" + digest.split(":", 1)[1])
        elif ":" in ref:
            repo, tag = ref.rsplit(":", 1)
            refs.add((repo, tag))
    return refs, digests, bounded(result)

def registry_request(method, path, headers=None, timeout=20):
    url = "http://127.0.0.1:5000" + path
    req = urllib.request.Request(url, method=method, headers=headers or {})
    with urllib.request.urlopen(req, timeout=timeout) as response:
        body = response.read()
        return {"status": response.status, "headers": dict(response.headers), "body": body.decode("utf-8", errors="replace")}

def registry_tag_rows():
    rows = []
    root = REGISTRY_REPOSITORY_ROOT
    if not os.path.isdir(root):
        return rows
    for repo_root, dirs, files in os.walk(root):
        if os.path.basename(repo_root) != "tags":
            continue
        rel = os.path.relpath(repo_root, root)
        suffix = "/_manifests/tags"
        if not rel.endswith(suffix):
            continue
        repo = rel[:-len(suffix)]
        try:
            tags = os.listdir(repo_root)
        except OSError:
            continue
        for tag in sorted(tags):
            link = os.path.join(repo_root, tag, "current", "link")
            if not os.path.isfile(link):
                continue
            try:
                with open(link, "r", encoding="utf-8") as handle:
                    digest = handle.read().strip()
                stat = os.stat(link)
            except OSError:
                continue
            rows.append({
                "repo": repo,
                "tag": tag,
                "digest": digest,
                "mtime": stat.st_mtime,
                "mtimeIso": time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime(stat.st_mtime)),
                "path": os.path.join(repo_root, tag),
            })
    return rows

def registry_revision_rows():
    rows = []
    root = REGISTRY_REPOSITORY_ROOT
    if not os.path.isdir(root):
        return rows
    for repo_root, dirs, files in os.walk(root):
        if os.path.basename(repo_root) != "sha256":
            continue
        rel = os.path.relpath(repo_root, root)
        suffix = "/_manifests/revisions/sha256"
        if not rel.endswith(suffix):
            continue
        repo = rel[:-len(suffix)]
        try:
            revisions = os.listdir(repo_root)
        except OSError:
            continue
        for digest_hex in sorted(revisions):
            path = os.path.join(repo_root, digest_hex)
            link = os.path.join(path, "link")
            if not os.path.isfile(link):
                continue
            try:
                with open(link, "r", encoding="utf-8") as handle:
                    digest = handle.read().strip()
                stat = os.stat(link)
            except OSError:
                continue
            rows.append({
                "repo": repo,
                "digest": digest,
                "mtime": stat.st_mtime,
                "mtimeIso": time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime(stat.st_mtime)),
                "path": path,
            })
    return rows

def registry_retention_repo(repo):
    return repo.startswith("hwlab/hwlab-") or repo.startswith("hwlab/cache/hwlab-")

def registry_digest_hex(digest):
    if not isinstance(digest, str) or not digest.startswith("sha256:"):
        return None
    value = digest.split(":", 1)[1]
    if re.match(r"^[0-9a-f]{64}$", value) is None:
        return None
    return value

def registry_blob_data_path(digest):
    value = registry_digest_hex(digest)
    if value is None:
        return None
    return os.path.join(REGISTRY_ROOT, "docker/registry/v2/blobs/sha256", value[:2], value, "data")

_manifest_cache = {}
def registry_manifest_json(digest):
    if digest in _manifest_cache:
        return _manifest_cache[digest]
    path = registry_blob_data_path(digest)
    if path is None or not os.path.isfile(path):
        _manifest_cache[digest] = None
        return None
    try:
        with open(path, "rb") as handle:
            data = handle.read(8 * 1024 * 1024)
        value = json.loads(data.decode("utf-8"))
    except Exception:
        value = None
    _manifest_cache[digest] = value
    return value

def registry_manifest_refs(digest):
    manifest = registry_manifest_json(digest)
    if not isinstance(manifest, dict):
        return set()
    refs = set()
    config = manifest.get("config") or {}
    config_digest = config.get("digest")
    if isinstance(config_digest, str) and registry_digest_hex(config_digest) is not None:
        refs.add(config_digest)
    for item in manifest.get("layers") or []:
        item_digest = (item or {}).get("digest")
        if isinstance(item_digest, str) and registry_digest_hex(item_digest) is not None:
            refs.add(item_digest)
    for item in manifest.get("manifests") or []:
        item_digest = (item or {}).get("digest")
        if isinstance(item_digest, str) and registry_digest_hex(item_digest) is not None:
            refs.add(item_digest)
    return refs

def registry_digest_closure(seed):
    seen = set()
    stack = list(seed)
    while stack:
        digest = stack.pop()
        if digest in seen or registry_digest_hex(digest) is None:
            continue
        seen.add(digest)
        for child in registry_manifest_refs(digest):
            if child not in seen:
                stack.append(child)
    return seen

def registry_blob_size(digest):
    path = registry_blob_data_path(digest)
    if path is None or not os.path.isfile(path):
        return 0
    try:
        return int(os.lstat(path).st_blocks) * 512
    except OSError:
        return 0

def estimate_registry_reclaim(delete_manifest_digests, kept_manifest_digests):
    deleted = registry_digest_closure(delete_manifest_digests)
    kept = registry_digest_closure(kept_manifest_digests)
    reclaim = deleted - kept
    return sum(registry_blob_size(digest) for digest in reclaim)

def plan_registry_retention():
    keep_per_repo = int(OPTIONS.get("registryKeepPerRepo") if OPTIONS.get("registryKeepPerRepo") is not None else 5)
    min_age_hours = float(OPTIONS.get("registryMinAgeHours") if OPTIONS.get("registryMinAgeHours") is not None else 48)
    cutoff = time.time() - min_age_hours * 3600
    refs, digests, refs_command = workload_image_refs()
    rows = registry_tag_rows()
    revision_rows = registry_revision_rows()
    by_repo = {}
    for row in rows:
        by_repo.setdefault(row["repo"], []).append(row)
    keep = set()
    keep_reasons = {}
    for repo, items in by_repo.items():
        items.sort(key=lambda item: item["mtime"], reverse=True)
        for row in items[:keep_per_repo]:
            key = (row["repo"], row["tag"])
            keep.add(key)
            keep_reasons[key] = "latest-per-repo"
        for row in items:
            key = (row["repo"], row["tag"])
            if row["tag"] in REGISTRY_PROTECTED_TAGS:
                keep.add(key)
                keep_reasons[key] = "protected-tag"
            if key in refs:
                keep.add(key)
                keep_reasons[key] = "workload-tag-ref"
            if row["digest"] in digests:
                keep.add(key)
                keep_reasons[key] = "workload-digest-ref"
            if row["repo"].startswith("hwlab/cache/"):
                keep.add(key)
                keep_reasons[key] = "cache-repo"
            if row["mtime"] >= cutoff:
                keep.add(key)
                keep_reasons[key] = "recent-tag"
    delete_rows = []
    kept_count = 0
    delete_by_repo = {}
    keep_by_repo = {}
    kept_digests = set()
    for row in rows:
        key = (row["repo"], row["tag"])
        should_delete = (
            key not in keep
            and row["repo"].startswith("hwlab/hwlab-")
            and re.match(r"^[0-9a-f]{7,40}$", row["tag"]) is not None
        )
        if should_delete:
            delete_rows.append(row)
            delete_by_repo[row["repo"]] = delete_by_repo.get(row["repo"], 0) + 1
        else:
            kept_count += 1
            kept_digests.add(row["digest"])
            keep_by_repo[row["repo"]] = keep_by_repo.get(row["repo"], 0) + 1
    protected_digests = kept_digests | digests
    protected_digests.update(row["digest"] for row in revision_rows if not registry_retention_repo(row["repo"]))
    protected_digests = registry_digest_closure(protected_digests)
    delete_revision_rows = []
    revision_delete_by_repo = {}
    for row in revision_rows:
        if not registry_retention_repo(row["repo"]):
            continue
        if row["digest"] in protected_digests:
            continue
        delete_revision_rows.append(row)
        revision_delete_by_repo[row["repo"]] = revision_delete_by_repo.get(row["repo"], 0) + 1
    kept_revision_digests = set(row["digest"] for row in revision_rows if row not in delete_revision_rows)
    delete_revision_digests = set(row["digest"] for row in delete_revision_rows)
    deletable_manifests = {}
    for row in delete_rows:
        if row["digest"] in kept_digests:
            continue
        deletable_manifests.setdefault(row["repo"], set()).add(row["digest"])
    for row in delete_revision_rows:
        deletable_manifests.setdefault(row["repo"], set()).add(row["digest"])
    deletable_manifest_count = sum(len(items) for items in deletable_manifests.values())
    registry_size = du_size(REGISTRY_ROOT, 30) or 0
    estimate = estimate_registry_reclaim(delete_revision_digests, kept_revision_digests)
    return {
        "tagRows": rows,
        "revisionRows": revision_rows,
        "deleteRows": delete_rows,
        "deleteRevisionRows": delete_revision_rows,
        "summary": {
            "totalTags": len(rows),
            "totalRevisions": len(revision_rows),
            "repoCount": len(by_repo),
            "keepPerRepo": keep_per_repo,
            "minAgeHours": min_age_hours,
            "protectedWorkloadRefs": len(refs),
            "protectedDigestRefs": len(digests),
            "protectedDigestClosure": len(protected_digests),
            "keptTags": kept_count,
            "deleteTags": len(delete_rows),
            "deleteManifests": deletable_manifest_count,
            "deleteRevisions": len(delete_revision_rows),
            "deleteByRepo": delete_by_repo,
            "revisionDeleteByRepo": revision_delete_by_repo,
            "keepByRepo": keep_by_repo,
            "registrySizeBytes": registry_size,
            "estimatedReclaimBytes": estimate,
        },
        "deleteManifestsByRepo": {repo: sorted(list(digests)) for repo, digests in deletable_manifests.items()},
        "refsCommand": refs_command,
    }

def registry_deployment_preflight():
    dep = kubectl_json(["-n", "hwlab-ci", "get", "deploy", "hwlab-registry"], 20)
    if not dep:
        return {"ok": False, "reason": "registry-deployment-missing"}
    spec = ((dep.get("spec") or {}).get("template") or {}).get("spec") or {}
    containers = spec.get("containers") or []
    volumes = spec.get("volumes") or []
    registry_container = next((item for item in containers if item.get("name") == "registry"), containers[0] if containers else {})
    mounts = registry_container.get("volumeMounts") or []
    has_host_path = any(((vol.get("hostPath") or {}).get("path") == REGISTRY_ROOT and vol.get("name") == "storage") for vol in volumes)
    has_mount = any((mount.get("name") == "storage" and mount.get("mountPath") == "/var/lib/registry") for mount in mounts)
    image = str(registry_container.get("image") or "")
    ok = bool(has_host_path and has_mount and image.startswith("registry:") and spec.get("hostNetwork") is True)
    return {
        "ok": ok,
        "reason": "ok" if ok else "unexpected-registry-deployment-shape",
        "image": image,
        "hostNetwork": spec.get("hostNetwork"),
        "hasExpectedHostPath": has_host_path,
        "hasExpectedMount": has_mount,
        "replicas": (dep.get("spec") or {}).get("replicas"),
        "readyReplicas": (dep.get("status") or {}).get("readyReplicas"),
    }

def cronjob_suspend_states(names):
    states = {}
    for name in names:
        data = kubectl_json(["-n", "hwlab-ci", "get", "cronjob", name], 15)
        if data:
            states[name] = bool(((data.get("spec") or {}).get("suspend")) is True)
    return states

def patch_cronjob_suspend(name, suspend):
    payload = json.dumps({"spec": {"suspend": bool(suspend)}})
    return kctl(["-n", "hwlab-ci", "patch", "cronjob", name, "--type=merge", "-p", payload], 30)

def wait_registry_pod_count(target, timeout=90):
    deadline = time.time() + timeout
    last = None
    while time.time() < deadline:
        result = kctl(["-n", "hwlab-ci", "get", "pods", "-l", "app.kubernetes.io/name=hwlab-registry", "--no-headers"], 20)
        last = bounded(result)
        lines = [line for line in (result.get("stdout") or "").splitlines() if line.strip()]
        active = []
        for line in lines:
            parts = line.split()
            status = parts[2] if len(parts) >= 3 else ""
            if status in set(["Completed", "Error", "Failed", "Succeeded"]):
                continue
            active.append(line)
        if len(active) == target:
            return {"ok": True, "lines": active, "allLines": lines, "last": last}
        time.sleep(2)
    return {"ok": False, "lines": [], "last": last}

def wait_pod_terminal(name, timeout=900):
    deadline = time.time() + timeout
    last = None
    while time.time() < deadline:
        data = kubectl_json(["-n", "hwlab-ci", "get", "pod", name], 20)
        if data:
            phase = ((data.get("status") or {}).get("phase")) or ""
            last = {"phase": phase}
            if phase == "Succeeded":
                return {"ok": True, "phase": phase}
            if phase == "Failed":
                return {"ok": False, "phase": phase}
        time.sleep(3)
    return {"ok": False, "phase": "Timeout", "last": last}

def execute_registry_retention():
    if PROVIDER_ID.upper() != "G14":
        raise RuntimeError("HWLAB registry retention is only supported on G14")
    deployment = registry_deployment_preflight()
    if not deployment.get("ok"):
        raise RuntimeError("registry deployment preflight failed: %s" % deployment.get("reason"))
    active = active_hwlab_ci_writes()
    if not active.get("ok") or int(active.get("activeCount") or 0) > 0:
        raise RuntimeError("refusing registry maintenance while hwlab-ci PipelineRun/TaskRun is active")
    plan = plan_registry_retention()
    delete_rows = plan.get("deleteRows") or []
    delete_revision_rows = plan.get("deleteRevisionRows") or []
    delete_manifests = plan.get("deleteManifestsByRepo") or {}
    if not delete_rows and not delete_revision_rows:
        return {"reclaimedBytes": 0, "commandOutput": {"message": "no registry tags or revisions matched conservative retention", "registryPlan": plan.get("summary")}}
    if not delete_manifests:
        return {"reclaimedBytes": 0, "commandOutput": {"message": "matched manifests are still referenced by retained manifests; registry GC would not reclaim blobs", "registryPlan": plan.get("summary")}}
    cronjobs = ["hwlab-g14-branch-poller", "hwlab-v02-branch-poller"]
    original_crons = cronjob_suspend_states(cronjobs)
    before = du_size(REGISTRY_ROOT, 60) or 0
    gc_name = "hwlab-registry-gc-%s" % int(time.time())
    steps = []
    try:
        for name in original_crons:
            result = patch_cronjob_suspend(name, True)
            steps.append({"step": "suspend-cronjob", "name": name, "result": bounded(result)})
            if result["exitCode"] != 0:
                raise RuntimeError("failed to suspend cronjob %s" % name)
        idle_after_suspend = wait_no_active_hwlab_ci(180)
        steps.append({"step": "idle-after-suspend", "result": idle_after_suspend})
        if not idle_after_suspend.get("ok"):
            raise RuntimeError("refusing registry maintenance because hwlab-ci did not become idle after suspend")

        deleted_manifests = []
        for repo, digests in delete_manifests.items():
            encoded_repo = "/".join(urllib.parse.quote(part, safe="") for part in repo.split("/"))
            for digest in digests:
                try:
                    result = registry_request("DELETE", "/v2/%s/manifests/%s" % (encoded_repo, urllib.parse.quote(digest, safe=":")), {"Accept": "application/vnd.docker.distribution.manifest.v2+json, application/vnd.oci.image.manifest.v1+json"})
                    deleted_manifests.append({"repo": repo, "digest": digest, "status": result.get("status")})
                except urllib.error.HTTPError as exc:
                    if exc.code == 404:
                        deleted_manifests.append({"repo": repo, "digest": digest, "status": 404})
                    else:
                        raise
        steps.append({"step": "registry-api-delete-manifests", "count": len(deleted_manifests), "preview": deleted_manifests[:20]})

        scale_down = kctl(["-n", "hwlab-ci", "scale", "deploy", "hwlab-registry", "--replicas=0"], 60)
        steps.append({"step": "scale-registry-down", "result": bounded(scale_down)})
        if scale_down["exitCode"] != 0:
            raise RuntimeError("failed to scale registry down")
        waited_down = wait_registry_pod_count(0, 120)
        steps.append({"step": "wait-registry-down", "result": waited_down})
        if not waited_down.get("ok"):
            raise RuntimeError("registry pod did not scale down")

        deleted = []
        for row in delete_rows:
            path = os.path.abspath(str(row.get("path") or ""))
            if not path.startswith(REGISTRY_REPOSITORY_ROOT + "/") or "/_manifests/tags/" not in path:
                raise RuntimeError("refusing unexpected registry tag path: %s" % path)
            if not re.match(r"^[0-9a-f]{7,40}$", str(row.get("tag") or "")):
                raise RuntimeError("refusing unexpected registry tag name: %s" % row.get("tag"))
            if os.path.isdir(path) and not os.path.islink(path):
                shutil.rmtree(path)
                deleted.append({"repo": row.get("repo"), "tag": row.get("tag"), "digest": row.get("digest")})
        steps.append({"step": "delete-tag-directories", "count": len(deleted)})

        deleted_revisions = []
        for row in delete_revision_rows:
            path = os.path.abspath(str(row.get("path") or ""))
            digest_hex = registry_digest_hex(str(row.get("digest") or ""))
            if digest_hex is None:
                raise RuntimeError("refusing unexpected registry revision digest: %s" % row.get("digest"))
            if not path.startswith(REGISTRY_REPOSITORY_ROOT + "/") or "/_manifests/revisions/sha256/" not in path:
                raise RuntimeError("refusing unexpected registry revision path: %s" % path)
            if os.path.basename(path) != digest_hex:
                raise RuntimeError("refusing registry revision path/digest mismatch: %s" % path)
            if os.path.isdir(path) and not os.path.islink(path):
                shutil.rmtree(path)
                deleted_revisions.append({"repo": row.get("repo"), "digest": row.get("digest")})
        steps.append({"step": "delete-revision-directories", "count": len(deleted_revisions)})

        overrides = {
            "apiVersion": "v1",
            "spec": {
                "restartPolicy": "Never",
                "containers": [{
                    "name": "registry-gc",
                    "image": "registry:2.8.3",
                    "command": ["registry", "garbage-collect", "/etc/docker/registry/config.yml"],
                    "volumeMounts": [{"name": "storage", "mountPath": "/var/lib/registry"}],
                }],
                "volumes": [{"name": "storage", "hostPath": {"path": REGISTRY_ROOT, "type": "DirectoryOrCreate"}}],
            },
        }
        run_gc = kctl(["-n", "hwlab-ci", "run", gc_name, "--restart=Never", "--image=registry:2.8.3", "--overrides=%s" % json.dumps(overrides)], 60)
        steps.append({"step": "start-registry-gc-pod", "result": bounded(run_gc), "pod": gc_name})
        if run_gc["exitCode"] != 0:
            raise RuntimeError("failed to start registry GC pod")
        waited_gc = wait_pod_terminal(gc_name, 900)
        steps.append({"step": "wait-registry-gc", "result": waited_gc})
        logs = kctl(["-n", "hwlab-ci", "logs", gc_name], 120)
        steps.append({"step": "registry-gc-logs", "result": bounded(logs)})
        if not waited_gc.get("ok"):
            raise RuntimeError("registry GC pod did not complete successfully")
    finally:
        cleanup_gc = kctl(["-n", "hwlab-ci", "delete", "pod", gc_name, "--ignore-not-found=true"], 60)
        steps.append({"step": "delete-registry-gc-pod", "result": bounded(cleanup_gc)})
        scale_up = kctl(["-n", "hwlab-ci", "scale", "deploy", "hwlab-registry", "--replicas=%s" % int(deployment.get("replicas") or 1)], 60)
        steps.append({"step": "scale-registry-up", "result": bounded(scale_up)})
        rollout = kctl(["-n", "hwlab-ci", "rollout", "status", "deploy/hwlab-registry", "--timeout=180s"], 200)
        steps.append({"step": "wait-registry-rollout", "result": bounded(rollout)})
        for name, was_suspended in original_crons.items():
            restore = patch_cronjob_suspend(name, was_suspended)
            steps.append({"step": "restore-cronjob", "name": name, "suspend": was_suspended, "result": bounded(restore)})
    after = du_size(REGISTRY_ROOT, 60) or 0
    return {
        "reclaimedBytes": max(0, before - after),
        "commandOutput": {
            "registryPlan": plan.get("summary"),
            "deletedTagCount": len(delete_rows),
            "deletedRevisionCount": len(delete_revision_rows),
            "deletedManifestCount": sum(len(items) for items in delete_manifests.values()),
            "diskBeforeBytes": before,
            "diskAfterBytes": after,
            "steps": steps[-12:],
        },
    }

def execute_registry_garbage_collect_only():
    if PROVIDER_ID.upper() != "G14":
        raise RuntimeError("HWLAB registry garbage-collect is only supported on G14")
    deployment = registry_deployment_preflight()
    if not deployment.get("ok"):
        raise RuntimeError("registry deployment preflight failed: %s" % deployment.get("reason"))
    active = active_hwlab_ci_writes()
    if not active.get("ok") or int(active.get("activeCount") or 0) > 0:
        raise RuntimeError("refusing registry maintenance while hwlab-ci PipelineRun/TaskRun is active")
    cronjobs = ["hwlab-g14-branch-poller", "hwlab-v02-branch-poller"]
    original_crons = cronjob_suspend_states(cronjobs)
    before = du_size(REGISTRY_ROOT, 60) or 0
    gc_name = "hwlab-registry-gc-%s" % int(time.time())
    steps = []
    try:
        for name in original_crons:
            result = patch_cronjob_suspend(name, True)
            steps.append({"step": "suspend-cronjob", "name": name, "result": bounded(result)})
            if result["exitCode"] != 0:
                raise RuntimeError("failed to suspend cronjob %s" % name)
        idle_after_suspend = wait_no_active_hwlab_ci(180)
        steps.append({"step": "idle-after-suspend", "result": idle_after_suspend})
        if not idle_after_suspend.get("ok"):
            raise RuntimeError("refusing registry maintenance because hwlab-ci did not become idle after suspend")

        scale_down = kctl(["-n", "hwlab-ci", "scale", "deploy", "hwlab-registry", "--replicas=0"], 60)
        steps.append({"step": "scale-registry-down", "result": bounded(scale_down)})
        if scale_down["exitCode"] != 0:
            raise RuntimeError("failed to scale registry down")
        waited_down = wait_registry_pod_count(0, 120)
        steps.append({"step": "wait-registry-down", "result": waited_down})
        if not waited_down.get("ok"):
            raise RuntimeError("registry pod did not scale down")

        overrides = {
            "apiVersion": "v1",
            "spec": {
                "restartPolicy": "Never",
                "containers": [{
                    "name": "registry-gc",
                    "image": "registry:2.8.3",
                    "command": ["registry", "garbage-collect", "/etc/docker/registry/config.yml"],
                    "volumeMounts": [{"name": "storage", "mountPath": "/var/lib/registry"}],
                }],
                "volumes": [{"name": "storage", "hostPath": {"path": REGISTRY_ROOT, "type": "DirectoryOrCreate"}}],
            },
        }
        run_gc = kctl(["-n", "hwlab-ci", "run", gc_name, "--restart=Never", "--image=registry:2.8.3", "--overrides=%s" % json.dumps(overrides)], 60)
        steps.append({"step": "start-registry-gc-pod", "result": bounded(run_gc), "pod": gc_name})
        if run_gc["exitCode"] != 0:
            raise RuntimeError("failed to start registry GC pod")
        waited_gc = wait_pod_terminal(gc_name, 900)
        steps.append({"step": "wait-registry-gc", "result": waited_gc})
        logs = kctl(["-n", "hwlab-ci", "logs", gc_name], 120)
        steps.append({"step": "registry-gc-logs", "result": bounded(logs)})
        if not waited_gc.get("ok"):
            raise RuntimeError("registry GC pod did not complete successfully")
    finally:
        cleanup_gc = kctl(["-n", "hwlab-ci", "delete", "pod", gc_name, "--ignore-not-found=true"], 60)
        steps.append({"step": "delete-registry-gc-pod", "result": bounded(cleanup_gc)})
        scale_up = kctl(["-n", "hwlab-ci", "scale", "deploy", "hwlab-registry", "--replicas=%s" % int(deployment.get("replicas") or 1)], 60)
        steps.append({"step": "scale-registry-up", "result": bounded(scale_up)})
        rollout = kctl(["-n", "hwlab-ci", "rollout", "status", "deploy/hwlab-registry", "--timeout=180s"], 200)
        steps.append({"step": "wait-registry-rollout", "result": bounded(rollout)})
        for name, was_suspended in original_crons.items():
            restore = patch_cronjob_suspend(name, was_suspended)
            steps.append({"step": "restore-cronjob", "name": name, "suspend": was_suspended, "result": bounded(restore)})
    after = du_size(REGISTRY_ROOT, 60) or 0
    return {
        "reclaimedBytes": max(0, before - after),
        "commandOutput": {
            "message": "official registry garbage-collect only; no additional tag deletion",
            "diskBeforeBytes": before,
            "diskAfterBytes": after,
            "steps": steps[-12:],
        },
    }

def start_registry_retention_job(mode):
    job_id = "g14-registry-%s-%s" % (int(time.time()), os.getpid())
    paths = job_paths(job_id)
    started_at = now_iso()
    initial = {
        "ok": True,
        "action": "gc remote status",
        "providerId": PROVIDER_ID,
        "jobId": job_id,
        "status": "running",
        "kind": "hwlab-registry-retention-gc" if mode == "retention" else "hwlab-registry-garbage-collect",
        "mode": mode,
        "startedAt": started_at,
        "statePath": paths["state"],
        "logPath": paths["log"],
        "options": OPTIONS,
    }
    write_json_atomic(paths["state"], initial)
    pid = os.fork()
    if pid != 0:
        return {
            "status": "started",
            "reclaimedBytes": None,
            "commandOutput": {
                "jobId": job_id,
                "pid": pid,
                "statePath": paths["state"],
                "logPath": paths["log"],
                "statusCommand": "bun scripts/cli.ts gc remote %s status --job-id %s" % (PROVIDER_ID, job_id),
                "message": "registry retention GC is running as a detached remote job",
            },
        }

    try:
        os.setsid()
    except Exception:
        pass
    try:
        devnull = os.open(os.devnull, os.O_RDONLY)
        os.dup2(devnull, 0)
        os.close(devnull)
    except Exception:
        pass
    try:
        log_handle = open(paths["log"], "a", encoding="utf-8", buffering=1)
        os.dup2(log_handle.fileno(), 1)
        os.dup2(log_handle.fileno(), 2)
    except Exception:
        log_handle = None
    try:
        print("[%s] starting HWLAB registry %s job %s" % (now_iso(), mode, job_id), flush=True)
        result = execute_registry_retention() if mode == "retention" else execute_registry_garbage_collect_only()
        payload = dict(initial)
        payload.update({
            "status": "succeeded",
            "finishedAt": now_iso(),
            "result": result,
            "diskAfter": df_snapshot(),
            "clusterAfter": cluster_preflight(),
        })
        write_json_atomic(paths["state"], payload)
        print("[%s] completed HWLAB registry %s job %s" % (now_iso(), mode, job_id), flush=True)
        os._exit(0)
    except Exception as exc:
        payload = dict(initial)
        payload.update({
            "ok": False,
            "status": "failed",
            "finishedAt": now_iso(),
            "error": str(exc),
            "diskAfter": df_snapshot(),
            "clusterAfter": cluster_preflight(),
        })
        try:
            write_json_atomic(paths["state"], payload)
        except Exception:
            pass
        print("[%s] failed HWLAB registry %s job %s: %s" % (now_iso(), mode, job_id, exc), flush=True)
        os._exit(1)
    finally:
        try:
            if log_handle:
                log_handle.close()
        except Exception:
            pass

def collect_protected():
    protected_paths = [
        ("hwlab-k3s-runtime", "/var/lib/rancher/k3s", "Native k3s runtime, containerd state, local-path storage and control-plane data are protected."),
        ("hwlab-k3s-storage", "/var/lib/rancher/k3s/storage", "Local-path PVC data is protected; cleanup must go through HWLAB/Tekton retention commands."),
        ("hwlab-kubelet", "/var/lib/kubelet", "Kubelet pod/runtime state is protected."),
        ("host-containerd", "/var/lib/containerd", "Host containerd state is protected; generic gc does not prune containerd images."),
        ("hwlab-host-data", "/var/lib/hwlab", "HWLAB host data/cache is protected from generic remote gc until a HWLAB-specific retention rule classifies it."),
        ("hwlab-source", "/root/hwlab", "G14 HWLAB fixed source workspace is protected."),
        ("hwlab-v02-source", "/root/hwlab-v02", "HWLAB v0.2 fixed source workspace is protected."),
        ("agentrun-source", "/root/agentrun", "AgentRun fixed source workspace is protected."),
        ("docker-images-and-volumes", "docker-images-volumes", "Remote gc does not remove Docker images, containers, volumes or Compose projects."),
        ("k8s-api-objects", "deployments-statefulsets-secrets-pvcs", "Remote gc does not mutate Kubernetes workloads, Secrets, PVCs, PVs, Argo CD or Tekton objects."),
    ]
    result = []
    for kind, ref, reason in protected_paths:
        item = {"kind": kind, "risk": "blocked", "ref": ref, "reason": reason}
        if ref.startswith("/") and os.path.exists(ref):
            item["sizeBytes"] = du_size(ref)
        result.append(item)
    return result

def collect_candidates(observed_at):
    candidates = []
    if OPTIONS.get("journal", True):
        usage = command(["journalctl", "--disk-usage"], 5)
        current = parse_journal_usage((usage["stdout"] or "") + (usage["stderr"] or ""))
        target = int(OPTIONS.get("journalTargetBytes") or 536870912)
        if current is not None and current > target:
            candidates.append({
                "id": "journalctl:vacuum",
                "kind": "journal-vacuum",
                "risk": "medium",
                "description": "Vacuum systemd journal to %s" % fmt_bytes(target),
                "sizeBytes": current,
                "estimatedReclaimBytes": max(0, current - target),
                "action": {"command": ["journalctl", "--vacuum-size=%s" % target]},
            })

    if OPTIONS.get("dockerLogs", True):
        max_bytes = int(OPTIONS.get("dockerLogMaxBytes") or 52428800)
        for container in docker_containers():
            path = container.get("logPath") or ""
            if not path or not os.path.exists(path):
                continue
            try:
                size = os.path.getsize(path)
            except OSError:
                continue
            if size <= max_bytes:
                continue
            candidates.append({
                "id": "docker-json-log:%s" % container["id"],
                "kind": "docker-json-log-truncate",
                "risk": "medium",
                "description": "Truncate Docker json-file log larger than %s" % fmt_bytes(max_bytes),
                "path": path,
                "container": {"id": container["id"][:12], "name": container["name"], "image": container["image"]},
                "sizeBytes": size,
                "estimatedReclaimBytes": size,
                "action": {"op": "truncate", "targetBytes": 0},
            })

    if OPTIONS.get("buildCache", True):
        system_df = command(["docker", "system", "df"], 8)
        if system_df["exitCode"] == 0:
            cache = parse_docker_build_cache(system_df["stdout"])
            if cache is not None and cache["reclaimableBytes"] > 0:
                until = str(OPTIONS.get("buildCacheUntil") or "24h")
                candidates.append({
                    "id": "docker-builder:prune",
                    "kind": "docker-build-cache-prune",
                    "risk": "low",
                    "description": "Prune Docker BuildKit cache unused for %s" % until,
                    "sizeBytes": cache["sizeBytes"],
                    "estimatedReclaimBytes": cache["reclaimableBytes"],
                    "action": {"command": ["docker", "builder", "prune", "--all", "--force", "--filter", "until=%s" % until], "estimate": "docker-system-df-reclaimable-upper-bound"},
                })

    if OPTIONS.get("aptCache", True):
        apt_path = "/var/cache/apt/archives"
        size = du_size(apt_path) or 0
        if size > 10 * 1024 * 1024:
            candidates.append({
                "id": "apt-cache:clean",
                "kind": "apt-cache-clean",
                "risk": "low",
                "description": "Clean downloaded apt package archives",
                "path": apt_path,
                "sizeBytes": size,
                "estimatedReclaimBytes": size,
                "action": {"command": ["apt-get", "clean"]},
            })

    if OPTIONS.get("coreDumps", True):
        cutoff = time.time() - float(OPTIONS.get("coreDumpMinAgeHours") or 1) * 3600
        for root in sorted(CORE_DUMP_DIR_ALLOWLIST):
            if not os.path.isdir(root):
                continue
            for name in os.listdir(root):
                if not re.match(r"^core\.\d+$", name):
                    continue
                path = os.path.join(root, name)
                try:
                    stat = os.lstat(path)
                except OSError:
                    continue
                if not os.path.isfile(path) or os.path.islink(path):
                    continue
                if stat.st_mtime >= cutoff:
                    continue
                disk_size = allocated_file_size(path)
                candidates.append({
                    "id": "core-dump:%s" % path,
                    "kind": "core-dump-delete",
                    "risk": "low",
                    "description": "Delete untracked process core dump older than %s hours" % OPTIONS.get("coreDumpMinAgeHours"),
                    "path": path,
                    "sizeBytes": int(disk_size),
                    "estimatedReclaimBytes": int(disk_size),
                    "apparentSizeBytes": int(stat.st_size),
                    "action": {"op": "unlink", "allowlist": "root-unidesk-core-dot-pid"},
                })

    if OPTIONS.get("tmp", True) and os.path.isdir("/tmp"):
        cutoff = time.time() - float(OPTIONS.get("tmpMinAgeHours") or 24) * 3600
        for name in os.listdir("/tmp"):
            path = os.path.join("/tmp", name)
            if path in TMP_EXACT_PROTECT:
                continue
            if not any(name.startswith(prefix) for prefix in TMP_PREFIX_ALLOWLIST):
                continue
            try:
                stat = os.lstat(path)
            except OSError:
                continue
            if stat.st_mtime >= cutoff:
                continue
            size = du_size(path, 8) or path_size(path)
            if size <= 0:
                continue
            candidates.append({
                "id": "tmp:%s" % path,
                "kind": "tmp-path-delete",
                "risk": "low",
                "description": "Delete allowlisted /tmp path older than %s hours" % OPTIONS.get("tmpMinAgeHours"),
                "path": path,
                "sizeBytes": size,
                "estimatedReclaimBytes": size,
                "action": {"op": "rm-recursive", "allowlist": "tmp-prefix"},
            })
    if OPTIONS.get("hwlabRegistry", False):
        registry = plan_registry_retention()
        summary = registry.get("summary") or {}
        delete_rows = registry.get("deleteRows") or []
        delete_revision_rows = registry.get("deleteRevisionRows") or []
        estimate = int(summary.get("estimatedReclaimBytes") or 0)
        if delete_rows or delete_revision_rows:
            candidates.append({
                "id": "hwlab-registry:retention-gc",
                "kind": "hwlab-registry-retention-gc",
                "risk": "medium",
                "description": "Conservative HWLAB registry retention: keep current workload refs, retained tags and protected repos, delete stale manifest revisions, then run official registry garbage-collect",
                "path": REGISTRY_ROOT,
                "sizeBytes": int(summary.get("registrySizeBytes") or 0),
                "estimatedReclaimBytes": estimate,
                "action": {
                    "op": "registry-retention-gc",
                    "requiresMaintenanceWindow": True,
                    "keepPerRepo": summary.get("keepPerRepo"),
                    "minAgeHours": summary.get("minAgeHours"),
                    "deleteTags": len(delete_rows),
                    "deleteManifests": summary.get("deleteManifests"),
                    "deleteRevisions": summary.get("deleteRevisions"),
                    "deleteByRepo": summary.get("deleteByRepo"),
                    "revisionDeleteByRepo": summary.get("revisionDeleteByRepo"),
                    "protectedWorkloadRefs": summary.get("protectedWorkloadRefs"),
                    "protectedDigestRefs": summary.get("protectedDigestRefs"),
                    "protectedDigestClosure": summary.get("protectedDigestClosure"),
                },
            })
        elif bool(OPTIONS.get("registryGcOnly")) and int(summary.get("totalTags") or 0) > 0 and int(summary.get("deleteTags") or 0) == 0:
            candidates.append({
                "id": "hwlab-registry:garbage-collect-only",
                "kind": "hwlab-registry-garbage-collect",
                "risk": "medium",
                "description": "Run official HWLAB registry garbage-collect without deleting additional tags; useful after a previously interrupted retention run",
                "path": REGISTRY_ROOT,
                "sizeBytes": int(summary.get("registrySizeBytes") or 0),
                "estimatedReclaimBytes": 0,
                "action": {
                    "op": "registry-garbage-collect-only",
                    "requiresMaintenanceWindow": True,
                    "deleteTags": 0,
                    "registryPlan": summary,
                },
            })
    return sorted(candidates, key=lambda item: item.get("estimatedReclaimBytes") or 0, reverse=True)

def summarize(candidates, returned):
    by_kind = {}
    total = 0
    for item in candidates:
        size = int(item.get("estimatedReclaimBytes") or 0)
        total += size
        kind = item.get("kind") or "unknown"
        current = by_kind.setdefault(kind, {"count": 0, "estimatedReclaimBytes": 0, "estimatedReclaim": "0 B"})
        current["count"] += 1
        current["estimatedReclaimBytes"] += size
        current["estimatedReclaim"] = fmt_bytes(current["estimatedReclaimBytes"])
    returned_total = sum(int(item.get("estimatedReclaimBytes") or 0) for item in returned)
    return {
        "candidateCount": len(candidates),
        "returnedCandidateCount": len(returned),
        "estimatedReclaimBytes": total,
        "estimatedReclaim": fmt_bytes(total),
        "returnedEstimatedReclaimBytes": returned_total,
        "returnedEstimatedReclaim": fmt_bytes(returned_total),
        "byKind": by_kind,
    }

def assert_tmp_candidate(path):
    resolved = os.path.abspath(path)
    if not resolved.startswith("/tmp/"):
        raise RuntimeError("refusing to remove non-/tmp path: %s" % path)
    if resolved in TMP_EXACT_PROTECT:
        raise RuntimeError("refusing to remove protected tmp path: %s" % path)
    name = os.path.basename(resolved)
    if not any(name.startswith(prefix) for prefix in TMP_PREFIX_ALLOWLIST):
        raise RuntimeError("refusing to remove tmp path outside allowlist: %s" % path)

def assert_core_dump_candidate(path):
    resolved = os.path.abspath(path)
    parent = os.path.dirname(resolved)
    name = os.path.basename(resolved)
    if parent not in CORE_DUMP_DIR_ALLOWLIST:
        raise RuntimeError("refusing to remove core dump outside allowlisted directory: %s" % path)
    if not re.match(r"^core\.\d+$", name):
        raise RuntimeError("refusing to remove non core.<pid> file: %s" % path)
    if not os.path.isfile(resolved) or os.path.islink(resolved):
        raise RuntimeError("refusing to remove non-regular core dump: %s" % path)
    git = command(["git", "-C", parent, "ls-files", "--error-unmatch", name], 10)
    if git["exitCode"] == 0:
        raise RuntimeError("refusing to remove git-tracked file: %s" % path)
    if git["exitCode"] != 1:
        raise RuntimeError("refusing to remove core dump because git tracking check failed: %s" % path)
    fuser = command(["fuser", resolved], 5)
    if fuser["exitCode"] is None:
        raise RuntimeError("refusing to remove core dump because fuser check was unavailable: %s" % path)
    if fuser["exitCode"] == 0:
        raise RuntimeError("refusing to remove core dump with active process reference: %s" % path)

def execute(candidate):
    kind = candidate.get("kind")
    if kind == "journal-vacuum":
        result = command(["journalctl", "--vacuum-size=%s" % int(OPTIONS.get("journalTargetBytes") or 536870912)], 30)
        if result["exitCode"] != 0:
            raise RuntimeError((result["stderr"] or "journalctl vacuum failed").strip())
        return {"reclaimedBytes": None, "commandOutput": bounded(result)}
    if kind == "docker-json-log-truncate":
        path = candidate.get("path") or ""
        if not path.startswith("/var/lib/docker/containers/"):
            raise RuntimeError("refusing to truncate Docker log outside /var/lib/docker/containers")
        before = os.path.getsize(path) if os.path.exists(path) else 0
        with open(path, "r+b") as handle:
            handle.truncate(0)
        return {"reclaimedBytes": before}
    if kind == "docker-build-cache-prune":
        until = str(OPTIONS.get("buildCacheUntil") or "24h")
        result = command(["docker", "builder", "prune", "--all", "--force", "--filter", "until=%s" % until], 45)
        if result["exitCode"] != 0:
            raise RuntimeError((result["stderr"] or "docker builder prune failed").strip())
        return {"reclaimedBytes": None, "commandOutput": bounded(result)}
    if kind == "apt-cache-clean":
        before = du_size("/var/cache/apt/archives") or 0
        result = command(["apt-get", "clean"], 30)
        if result["exitCode"] != 0:
            raise RuntimeError((result["stderr"] or "apt-get clean failed").strip())
        after = du_size("/var/cache/apt/archives") or 0
        return {"reclaimedBytes": max(0, before - after), "commandOutput": bounded(result)}
    if kind == "tmp-path-delete":
        path = candidate.get("path") or ""
        assert_tmp_candidate(path)
        before = du_size(path, 8) or path_size(path)
        if os.path.isdir(path) and not os.path.islink(path):
            shutil.rmtree(path, ignore_errors=True)
        else:
            try:
                os.unlink(path)
            except FileNotFoundError:
                pass
        return {"reclaimedBytes": before}
    if kind == "core-dump-delete":
        path = candidate.get("path") or ""
        assert_core_dump_candidate(path)
        before = allocated_file_size(path)
        os.unlink(path)
        return {"reclaimedBytes": before}
    if kind == "hwlab-registry-retention-gc":
        return start_registry_retention_job("retention")
    if kind == "hwlab-registry-garbage-collect":
        return start_registry_retention_job("garbage-collect")
    raise RuntimeError("unsupported remote gc candidate kind: %s" % kind)

def visible_items(items):
    if bool(OPTIONS.get("full")):
        return items
    return items[:int(OPTIONS.get("limit") or 50)]

def returned_results(results):
    if bool(OPTIONS.get("full")):
        return results
    failed = [item for item in results if item.get("status") == "failed"]
    started = [item for item in results if item.get("status") == "started"]
    succeeded = [item for item in results if item.get("status") == "succeeded"]
    return (failed + started + succeeded)[:int(OPTIONS.get("resultLimit") or 50)]

def plan_payload(observed_at, preflight, protected, candidates, visible):
    return {
        "ok": True,
        "action": "gc remote plan",
        "providerId": PROVIDER_ID,
        "dryRun": True,
        "mutation": False,
        "observedAt": observed_at,
        "options": OPTIONS,
        "diskBefore": df_snapshot(),
        "clusterPreflight": preflight,
        "summary": summarize(candidates, visible),
        "candidates": visible,
        "protected": protected,
        "policy": {
            "requiresRunConfirm": True,
            "runCommand": "bun scripts/cli.ts gc remote %s run --confirm" % PROVIDER_ID,
            "neverTouches": [
                "/var/lib/rancher/k3s",
                "/var/lib/rancher/k3s/storage",
                "/var/lib/kubelet",
                "/var/lib/containerd",
                "/var/lib/hwlab unless --include-hwlab-registry is explicitly supplied",
                "Kubernetes Deployments/StatefulSets/Secrets/PVCs/PVs",
                "HWLAB fixed source workspaces",
                "Docker images, containers and volumes",
            ],
            "notes": [
                "Remote gc only executes the returned candidate page unless --full or a larger --limit is supplied.",
                "G14 run requires the expected native k3s node preflight before mutation.",
                "HWLAB DEV runtime and local-path PVC data are protected and require HWLAB-specific retention commands.",
                "Core dump cleanup only removes untracked /root/unidesk/core.<pid> regular files with no active fuser reference.",
                "HWLAB registry retention is opt-in: it keeps workload tag/digest refs, all tags newer than the retention age and the newest N tags per repo before official registry garbage-collect.",
            ],
        },
    }

def main():
    observed_at = now_iso()
    preflight = cluster_preflight()
    protected = collect_protected()
    candidates = collect_candidates(observed_at)
    visible = visible_items(candidates)
    if ACTION == "plan":
        print(json.dumps(plan_payload(observed_at, preflight, protected, candidates, visible), ensure_ascii=False, indent=2))
        return 0
    if ACTION == "status":
        print(json.dumps(remote_gc_job_status(), ensure_ascii=False, indent=2))
        return 0
    if ACTION != "run":
        print(json.dumps({"ok": False, "error": "unsupported-remote-gc-action", "action": ACTION}, ensure_ascii=False, indent=2))
        return 0
    if PROVIDER_ID.upper() == "G14" and not preflight.get("ok"):
        print(json.dumps({
            "ok": False,
            "error": "gc-remote-g14-preflight-failed",
            "action": "gc remote run",
            "providerId": PROVIDER_ID,
            "dryRun": True,
            "mutation": False,
            "clusterPreflight": preflight,
            "plan": plan_payload(observed_at, preflight, protected, candidates, visible),
        }, ensure_ascii=False, indent=2))
        return 0
    disk_before = df_snapshot()
    results = []
    for candidate in visible:
        try:
            execution = execute(candidate)
            item = dict(candidate)
            item.update({"status": execution.get("status") or "succeeded", "reclaimedBytes": execution.get("reclaimedBytes")})
            if "commandOutput" in execution:
                item["commandOutput"] = execution["commandOutput"]
            results.append(item)
        except Exception as exc:
            item = dict(candidate)
            item.update({"status": "failed", "reclaimedBytes": None, "error": str(exc)})
            results.append(item)
    disk_after = df_snapshot()
    failed = [item for item in results if item.get("status") == "failed"]
    returned = returned_results(results)
    payload = {
        "ok": len(failed) == 0,
        "action": "gc remote run",
        "providerId": PROVIDER_ID,
        "dryRun": False,
        "mutation": True,
        "observedAt": now_iso(),
        "options": OPTIONS,
        "diskBefore": disk_before,
        "diskAfter": disk_after,
        "clusterPreflight": preflight,
        "clusterAfter": cluster_preflight(),
        "summary": {
            "plannedCandidateCount": len(visible),
            "attemptedCount": len(results),
            "startedCount": len([item for item in results if item.get("status") == "started"]),
            "succeededCount": len([item for item in results if item.get("status") == "succeeded"]),
            "failedCount": len(failed),
            "estimatedReclaimBytes": sum(int(item.get("estimatedReclaimBytes") or 0) for item in visible),
            "actualDiskReclaimBytes": (disk_after["availableBytes"] - disk_before["availableBytes"]) if disk_before and disk_after else None,
            "resultCount": len(results),
            "returnedResultCount": len(returned),
            "omittedResultCount": max(0, len(results) - len(returned)),
        },
        "results": returned,
        "protected": protected,
    }
    print(json.dumps(payload, ensure_ascii=False, indent=2))
    return 0

if __name__ == "__main__":
    raise SystemExit(main())
`;
}