#!/bin/sh
# Keep the committed OpenAPI spec in sync with the API router: regenerate it
# and abort the push when the regenerated file would change, so the spec can
# never go stale. Only runs when API source files changed, to avoid slowing
# down pushes that don't touch the API. Compare against both the working tree
# and the index so the check passes only after the file is actually committed.

# Determine which commits are being pushed: read from stdin (format: <local-ref> <local-sha> <remote-ref> <remote-sha>)
# For initial push or when remote is behind, check all reachable commits.
while read -r local_ref local_sha remote_ref remote_sha; do
  if [ "$remote_sha" = "0000000000000000000000000000000000000000" ]; then
    # New branch: check all commits reachable from HEAD
    RANGE="$(git rev-list --max-parents=0 HEAD)..HEAD"
  else
    # Existing branch: check commits between remote and local
    RANGE="$remote_sha..$local_sha"
  fi
done

if git diff --name-only "$RANGE" -- src/server/api/ | grep -q .; then
  pnpm gen:openapi
  if [ -n "$(git status --porcelain -- src/server/api/openapi.generated.json)" ]; then
    echo "✖ src/server/api/openapi.generated.json is out of date."
    echo "  Run: pnpm gen:openapi && git add src/server/api/openapi.generated.json && git commit"
    exit 1
  fi
fi