#!/usr/bin/env bash
# Stamp landing footers per site: version + last content change + linkified commit.
#
# Sites: bank | exchange | merchant
#
# Usage (from koopa-admin-log root):
#   ./scripts/taler-landing/stamp-landing-version.sh bank
#       re-stamp bank with current version + HEAD
#   ./scripts/taler-landing/stamp-landing-version.sh --bump bank
#       bank version += 1, then stamp HEAD
#   ./scripts/taler-landing/stamp-landing-version.sh --set 42 exchange
#       force exchange version to 42
#   ./scripts/taler-landing/stamp-landing-version.sh --all
#       re-stamp all sites (no bump)
#   ./scripts/taler-landing/stamp-landing-version.sh --bump --all
#       bump every site by 1 (rare)
#
# Typical flow after editing one site:
#   1) edit configs/bank-landing/…
#   2) ./scripts/taler-landing/stamp-landing-version.sh --bump bank
#   3) git add configs/ && git commit -m "landing(bank): …"
#   4) ./scripts/taler-landing/stamp-landing-version.sh bank
#      git add configs/ && git commit --amend --no-edit   # optional pin
set -euo pipefail

ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
VER_FILE="$ROOT/configs/shared/landing-version.json"
REPO_WEB="${LANDING_REPO_WEB:-https://git.hacktivism.ch/hernani/koopa-admin-log}"

declare -A SITE_HTML=(
  [bank]="$ROOT/configs/bank-landing/index.html"
  [exchange]="$ROOT/configs/exchange-landing/index.html"
  [merchant]="$ROOT/configs/merchant-landing/index.html"
)
declare -A SITE_LABEL=(
  [bank]="Bank landing"
  [exchange]="Exchange landing"
  [merchant]="Merchant landing"
)
declare -A SITE_PATH=(
  [bank]="configs/bank-landing"
  [exchange]="configs/exchange-landing"
  [merchant]="configs/merchant-landing"
)

export TZ="${TZ:-Europe/Zurich}"

bump=0
set_ver=""
do_all=0
sites=()

while [ $# -gt 0 ]; do
  case "$1" in
    --bump) bump=1; shift ;;
    --set) set_ver="${2:-}"; shift 2 ;;
    --all) do_all=1; shift ;;
    bank|exchange|merchant) sites+=("$1"); shift ;;
    -h|--help)
      sed -n '2,28p' "$0"
      exit 0
      ;;
    *) echo "unknown arg: $1 (sites: bank exchange merchant)" >&2; exit 2 ;;
  esac
done

if [ "$do_all" = 1 ]; then
  sites=(bank exchange merchant)
fi
if [ "${#sites[@]}" -eq 0 ]; then
  echo "usage: $0 [--bump|--set N] bank|exchange|merchant|--all" >&2
  exit 2
fi

if [ ! -f "$VER_FILE" ]; then
  cat >"$VER_FILE" <<'EOF'
{"note":"per-site","sites":{"bank":{"version":42},"exchange":{"version":42},"merchant":{"version":42}}}
EOF
fi

if [ -n "${OVERRIDE_COMMIT:-}" ]; then
  full="$OVERRIDE_COMMIT"
else
  full=$(git -C "$ROOT" rev-parse HEAD 2>/dev/null || echo "unknown")
fi
short=$(git -C "$ROOT" rev-parse --short=7 "$full" 2>/dev/null || echo "${full:0:7}")
iso=$(date +%Y-%m-%dT%H:%M:%S%z | sed -E 's/([+-][0-9]{2})([0-9]{2})$/\1:\2/')
human=$(date +"%Y-%m-%d %H:%M %Z")
url="${REPO_WEB}/commit/${full}"

css_snip='    .landing-rev {
      margin: 0.75rem 0 0;
      font-size: 0.72rem;
      color: var(--muted, #9a8fb0);
      line-height: 1.45;
      text-align: center;
    }
    .landing-rev a { color: inherit; text-decoration: underline; text-underline-offset: 2px; opacity: 0.95; }
    .landing-rev strong { font-weight: 750; }
'

for site in "${sites[@]}"; do
  html="${SITE_HTML[$site]:-}"
  label="${SITE_LABEL[$site]:-}"
  relpath="${SITE_PATH[$site]:-}"
  [ -n "$html" ] && [ -f "$html" ] || { echo "missing site/html: $site" >&2; exit 1; }

  # resolve version for this site
  version=$(python3 - "$VER_FILE" "$site" "$bump" "$set_ver" <<'PY'
import json, sys
path, site, bump, set_ver = sys.argv[1:5]
data = json.load(open(path, encoding="utf-8"))
sites = data.setdefault("sites", {})
entry = sites.setdefault(site, {"version": 42})
v = int(entry.get("version", 42))
if set_ver:
    v = int(set_ver)
elif bump == "1":
    v += 1
print(v)
PY
)

  # update JSON entry for this site (preserve others)
  python3 - "$VER_FILE" "$site" "$version" "$label" "$relpath" "$iso" "$human" "$full" "$short" "$url" <<'PY'
import json, sys
path, site, version, label, relpath, iso, human, full, short, url = sys.argv[1:]
data = json.load(open(path, encoding="utf-8"))
data["note"] = (
    "Per-site landing content versions (start 42). "
    "Bump: scripts/taler-landing/stamp-landing-version.sh --bump bank|exchange|merchant"
)
sites = data.setdefault("sites", {})
sites[site] = {
    "version": int(version),
    "label": label,
    "path": relpath,
    "updated_iso": iso,
    "updated_human": human,
    "commit": full,
    "commit_short": short,
    "repo_commit_url": url,
}
open(path, "w", encoding="utf-8").write(json.dumps(data, indent=2, ensure_ascii=False) + "\n")
print(f"{site}: v{version} commit={short} at={human}")
PY

  block=$(cat <<EOF
      <!-- landing-rev -->
      <p class="landing-rev" data-landing-site="${site}" data-landing-version="${version}" data-landing-commit="${short}">
        ${label} <strong>v${version}</strong>
        · content <time datetime="${iso}">${human}</time>
        · <a href="${url}" title="koopa-admin-log ${full}">${short}</a>
      </p>
      <!-- /landing-rev -->
EOF
)

  # ensure CSS once
  if ! grep -q '\.landing-rev' "$html"; then
    python3 - "$html" "$css_snip" <<'PY'
import sys
path, snip = sys.argv[1], sys.argv[2]
t = open(path, encoding="utf-8").read()
if ".landing-rev" in t:
    raise SystemExit(0)
idx = t.find("</style>")
if idx < 0:
    raise SystemExit(f"no </style> in {path}")
open(path, "w", encoding="utf-8").write(t[:idx] + snip + "\n" + t[idx:])
print(f"css → {path}")
PY
  fi

  python3 - "$html" "$block" <<'PY'
import sys, re
path, block = sys.argv[1], sys.argv[2]
t = open(path, encoding="utf-8").read()
block = block.rstrip() + "\n"
pat = re.compile(r"[ \t]*<!-- landing-rev -->.*?<!-- /landing-rev -->\n?", re.S)
if pat.search(t):
    t = pat.sub(block, t, count=1)
else:
    t2, n = re.subn(r"(\n)([ \t]*</footer>)", r"\1" + block + r"\2", t, count=1)
    if n != 1:
        raise SystemExit(f"could not insert landing-rev in {path}")
    t = t2
open(path, "w", encoding="utf-8").write(t)
print(f"stamp → {path}")
PY
done

echo "OK stamped: ${sites[*]}"