#!/usr/bin/env bash
#
# v1.4.31 — Pre-commit hook: OpenAPI spec drift check.
#
# v1.4.30 PR push failed CI on first attempt because the two new
# MeasurementType enums (WALKING_STEADINESS, AUDIO_EXPOSURE_EVENT)
# weren't reflected in `docs/api/openapi.yaml`. A separate
# `chore(openapi): regenerate the public spec` commit was needed
# before the checks turned green. This hook catches that drift
# locally so a contributor sees the regeneration prompt at commit
# time instead of after a CI round-trip.
#
# Behaviour:
#   - Runs only when the staged diff touches a file that is likely
#     to invalidate the OpenAPI spec (Zod schemas under
#     src/lib/openapi/ or src/lib/validations/, or API route
#     handlers under src/app/api/).
#   - Reruns `pnpm openapi:generate` quietly and re-stages the
#     regenerated spec if the file diverged.
#   - Exits non-zero only if regeneration fails entirely.
#
# Install via `bash scripts/install-hooks.sh` (idempotent) or
# `git config core.hooksPath .githooks` from the repo root.

set -euo pipefail

# Skip in non-interactive contexts (CI doesn't commit through this
# path anyway — the security.yml workflow runs `pnpm openapi:check`
# server-side). The check still fires under `git commit` from a
# terminal.
if [ -n "${CI:-}" ]; then
  exit 0
fi

# Only run when relevant files are staged. The spec is generated
# from Zod schemas + route registrations; nothing else can
# legitimately move it.
staged_files="$(git diff --cached --name-only --diff-filter=ACMRT)"
if ! echo "$staged_files" | grep -qE '^(src/(lib/openapi|lib/validations|app/api)/|scripts/generate-openapi\.ts$)'; then
  exit 0
fi

echo "[openapi pre-commit] Checking the spec against the staged schema changes…"

# Quick path: run the comparison-only `check-openapi.ts`. If the
# generated and committed forms match, exit fast.
if pnpm --silent openapi:check >/dev/null 2>&1; then
  exit 0
fi

echo "[openapi pre-commit] Drift detected — regenerating docs/api/openapi.yaml."
if ! pnpm --silent openapi:generate; then
  echo "::error::pnpm openapi:generate failed. Fix the underlying error before committing."
  exit 1
fi

# Re-stage the regenerated spec so the commit-in-flight carries it.
git add docs/api/openapi.yaml
echo "[openapi pre-commit] Spec regenerated and re-staged. Continuing the commit."
exit 0