#!/usr/bin/env bash
# Stamp landing footers with version + last content change + linkified commit.
#
# Usage (from koopa-admin-log root):
#   ./scripts/taler-landing/stamp-landing-version.sh           # re-stamp with HEAD + current version
#   ./scripts/taler-landing/stamp-landing-version.sh --bump    # version += 1, then stamp HEAD
#   ./scripts/taler-landing/stamp-landing-version.sh --set 42  # force version
#
# Typical flow after editing landing HTML/CSS/JS:
#   1) edit landings
#   2) ./scripts/taler-landing/stamp-landing-version.sh --bump
#   3) git add configs/ && git commit
#   4) ./scripts/taler-landing/stamp-landing-version.sh && git add configs/ && git commit --amend --no-edit
#
# Or one-shot (commits for you if GIT_STAMP_COMMIT=1).
set -euo pipefail

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

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

bump=0
set_ver=""
while [ $# -gt 0 ]; do
  case "$1" in
    --bump) bump=1; shift ;;
    --set) set_ver="${2:-}"; shift 2 ;;
    -h|--help)
      sed -n '2,20p' "$0"
      exit 0
      ;;
    *) echo "unknown arg: $1" >&2; exit 2 ;;
  esac
done

if [ ! -f "$VER_FILE" ]; then
  echo '{"version":42,"updated_iso":"","updated_human":"","commit":"","commit_short":""}' >"$VER_FILE"
fi

version=$(python3 -c 'import json,sys; print(json.load(open(sys.argv[1])).get("version",42))' "$VER_FILE")
if [ -n "$set_ver" ]; then
  version="$set_ver"
elif [ "$bump" = 1 ]; then
  version=$((version + 1))
fi

# Prefer staged/index commit identity after commit; allow OVERRIDE_COMMIT
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}"

python3 - "$VER_FILE" "$version" "$iso" "$human" "$full" "$short" "$url" <<'PY'
import json, sys
path, version, iso, human, full, short, url = sys.argv[1:]
data = {
    "version": int(version),
    "updated_iso": iso,
    "updated_human": human,
    "commit": full,
    "commit_short": short,
    "repo_commit_url": url,
    "note": "Bump with scripts/taler-landing/stamp-landing-version.sh --bump after each landing content change.",
}
open(path, "w", encoding="utf-8").write(json.dumps(data, indent=2, ensure_ascii=False) + "\n")
print(f"version={version} commit={short} at={human}")
PY

# HTML block injected into each footer (idempotent via markers)
block=$(cat <<EOF
      <!-- landing-rev -->
      <p class="landing-rev" data-landing-version="${version}" data-landing-commit="${short}">
        Landing <strong>v${version}</strong>
        · content <time datetime="${iso}">${human}</time>
        · <a href="${url}" title="koopa-admin-log ${full}">${short}</a>
      </p>
      <!-- /landing-rev -->
EOF
)

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 f in "${LANDINGS[@]}"; do
  [ -f "$f" ] || { echo "missing $f" >&2; exit 1; }
  # ensure CSS once
  if ! grep -q '\.landing-rev' "$f"; then
    # insert before </style> of first style block
    python3 - "$f" "$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:
    sys.exit(0)
idx = t.find("</style>")
if idx < 0:
    raise SystemExit(f"no </style> in {path}")
t = t[:idx] + snip + "\n" + t[idx:]
open(path, "w", encoding="utf-8").write(t)
print(f"css → {path}")
PY
  fi
  # replace or insert rev block before </footer>
  python3 - "$f" "$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:
    # before closing footer
    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 landing v${version} → ${short} (${human})"