#!/usr/bin/env bash
set -euo pipefail

repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
apps_dir="${repo_root}/nextcloud/custom_apps"
nextcloud_image="${NEXTCLOUD_IMAGE:-}"
list_blocking_apps="0"
filter_mode="all"

usage() {
  cat <<'USAGE'
Usage: ./scripts/check-nextcloud-custom-app-compat.sh [options]

Checks custom app appinfo/info.xml Nextcloud dependency ranges against the
target Nextcloud Docker image major.

Options:
  --image <image>       Target Nextcloud image, for example nextcloud:34.0.1-apache
  --apps-dir <path>     Custom apps directory (default: ./nextcloud/custom_apps)
  --list-blocking-apps  Print only incompatible app IDs, one per line
  --tracked-only        Check only app manifests tracked by this git repo
  --untracked-only      Check only app manifests not tracked by this git repo
  -h, --help            Show this help
USAGE
}

while [[ $# -gt 0 ]]; do
  case "$1" in
    --image)
      nextcloud_image="${2:-}"
      shift 2
      ;;
    --image=*)
      nextcloud_image="${1#*=}"
      shift
      ;;
    --apps-dir)
      apps_dir="${2:-}"
      shift 2
      ;;
    --apps-dir=*)
      apps_dir="${1#*=}"
      shift
      ;;
    --list-blocking-apps)
      list_blocking_apps="1"
      shift
      ;;
    --tracked-only)
      filter_mode="tracked"
      shift
      ;;
    --untracked-only)
      filter_mode="untracked"
      shift
      ;;
    -h|--help)
      usage
      exit 0
      ;;
    *)
      echo "Unknown option: $1"
      usage
      exit 1
      ;;
  esac
done

if [[ -z "${nextcloud_image}" ]]; then
  echo "[nextcloud-app-compat] Skipped: --image or NEXTCLOUD_IMAGE is required."
  exit 0
fi

if [[ ! -d "${apps_dir}" ]]; then
  echo "[nextcloud-app-compat] Skipped: custom apps directory not found: ${apps_dir}"
  exit 0
fi

if ! command -v python3 >/dev/null 2>&1; then
  echo "[nextcloud-app-compat] Skipped: python3 is required for app compatibility checks."
  exit 0
fi

python3 - "${nextcloud_image}" "${apps_dir}" "${list_blocking_apps}" "${repo_root}" "${filter_mode}" <<'PY'
import os
import re
import subprocess
import sys
import xml.etree.ElementTree as ET

image = sys.argv[1].strip()
apps_dir = sys.argv[2]
list_blocking_apps = sys.argv[3] == "1"
repo_root = sys.argv[4]
filter_mode = sys.argv[5]
prefix = "[nextcloud-app-compat]"


def log(message):
    if list_blocking_apps:
        return
    print(f"{prefix} {message}")


def parse_major_from_image(value):
    tag = "latest"
    last_slash = value.rfind("/")
    last_colon = value.rfind(":")
    if last_colon > last_slash:
        tag = value[last_colon + 1 :]
    match = re.match(r"^(\d+)(?:[.-]|$)", tag)
    if not match:
        return None
    return int(match.group(1))


def is_tracked_manifest(manifest):
    try:
        rel_path = os.path.relpath(manifest, repo_root)
        result = subprocess.run(
            ["git", "-C", repo_root, "ls-files", "--error-unmatch", "--", rel_path],
            stdout=subprocess.DEVNULL,
            stderr=subprocess.DEVNULL,
            check=False,
        )
        return result.returncode == 0
    except Exception:
        return False


target_major = parse_major_from_image(image)
if target_major is None:
    log(f"Skipped: cannot determine target Nextcloud major from image tag: {image}")
    sys.exit(0)

manifests = []
for root, _dirs, files in os.walk(apps_dir):
    if "info.xml" in files and os.path.basename(root) == "appinfo":
        manifest = os.path.join(root, "info.xml")
        tracked = is_tracked_manifest(manifest)
        if filter_mode == "tracked" and not tracked:
            continue
        if filter_mode == "untracked" and tracked:
            continue
        manifests.append(manifest)

if not manifests:
    log(f"Skipped: no appinfo/info.xml files found under {apps_dir}")
    sys.exit(0)

failures = []
checked = 0
for manifest in sorted(manifests):
    try:
        tree = ET.parse(manifest)
    except ET.ParseError as exc:
        failures.append((os.path.basename(os.path.dirname(os.path.dirname(manifest))), f"{manifest}: invalid XML ({exc})"))
        continue

    root = tree.getroot()
    app_id = root.findtext("id") or os.path.basename(os.path.dirname(os.path.dirname(manifest)))
    dependency = root.find("./dependencies/nextcloud")
    if dependency is None:
        failures.append((app_id, f"{app_id}: missing <dependencies><nextcloud .../></dependencies>"))
        continue

    checked += 1
    min_version = dependency.attrib.get("min-version", "").strip()
    max_version = dependency.attrib.get("max-version", "").strip()
    try:
        min_major = int(min_version.split(".", 1)[0]) if min_version else None
        max_major = int(max_version.split(".", 1)[0]) if max_version else None
    except ValueError:
        failures.append((app_id, f"{app_id}: invalid Nextcloud dependency range min={min_version!r} max={max_version!r}"))
        continue

    if min_major is not None and target_major < min_major:
        failures.append((app_id, f"{app_id}: target major {target_major} is below min-version {min_version}"))
    if max_major is not None and target_major > max_major:
        failures.append((app_id, f"{app_id}: target major {target_major} exceeds max-version {max_version}"))

if failures:
    if list_blocking_apps:
        for app_id in sorted({app_id for app_id, _message in failures if app_id}):
            print(app_id)
        sys.exit(1)
    log(f"FAILED for target Nextcloud major {target_major} ({image})")
    for _app_id, failure in failures:
        log(f"  - {failure}")
    sys.exit(1)

log(f"OK: {checked} custom app manifest(s) declare compatibility with Nextcloud major {target_major}.")
PY