#!/usr/bin/env bash
# Branch and PR title naming-standard checker.
# Always exits 0 — warn-only until the Bugs system is live and STRICT=1 is set.
set -euo pipefail

BRANCH="${HEAD_BRANCH:-}"
TITLE="${PR_TITLE:-}"
AUTHOR="${PR_AUTHOR:-}"

# Break-glass: dfritz is exempt from all naming checks.
if [ "${AUTHOR}" = "dfritz" ]; then
  echo "check-naming: dfritz break-glass — exempt"
  exit 0
fi

WARN=0
BRANCH_KIND="invalid"
BRANCH_BUG=""

# ---- branch form ----
# <role>/bug-<id>/<kebab>
if echo "${BRANCH}" | grep -qE "^(dev|ux|ops|security|perf|architect|support)/bug-[a-z0-9]+/[a-z0-9][a-z0-9-]*$"; then
  BRANCH_KIND="role-bug"
  BRANCH_BUG=$(echo "${BRANCH}" | sed -E 's|^[^/]+/(bug-[a-z0-9]+)/.*|\1|')
# chore/<kebab>
elif echo "${BRANCH}" | grep -qE "^chore/[a-z0-9][a-z0-9-]*$"; then
  BRANCH_KIND="chore"
else
  echo "WARN[check-naming]: branch '${BRANCH}' does not match convention"
  echo "  expected: <role>/bug-<id>/<kebab>  (role: dev|ux|ops|security|perf|architect|support)"
  echo "         or: chore/<kebab>"
  WARN=1
fi

# ---- title form ----
TITLE_BUG=""
if echo "${TITLE}" | grep -qE "^\[bug-[a-z0-9]+\] ."; then
  TITLE_BUG=$(echo "${TITLE}" | sed -E 's|^\[(bug-[a-z0-9]+)\].*|\1|')
fi

if [ "${BRANCH_KIND}" = "role-bug" ]; then
  if [ -z "${TITLE_BUG}" ]; then
    echo "WARN[check-naming]: title missing [${BRANCH_BUG}] prefix for branch '${BRANCH}'"
    WARN=1
  elif [ "${TITLE_BUG}" != "${BRANCH_BUG}" ]; then
    echo "WARN[check-naming]: bug-id mismatch — branch carries '${BRANCH_BUG}' but title carries '${TITLE_BUG}'"
    WARN=1
  fi
elif [ "${BRANCH_KIND}" = "chore" ] && [ -n "${TITLE_BUG}" ]; then
  echo "WARN[check-naming]: chore branch should not carry a [bug-id] title prefix"
  WARN=1
fi

if [ "${WARN}" -eq 0 ]; then
  echo "check-naming: ok"
fi

exit 0