#!/usr/bin/env bash
#
# Fails when frontend/wailsjs/ is stale against the bound Go structs.
#
# frontend/wailsjs/ is generated by `wails`, not by `go generate`, so the
# pre-commit codegen check does not cover it at all.  Without this, a
# renamed Go struct field or a changed method signature first shows up at
# runtime, inside a window, as a binding that never settles.
#
# `wails generate module` builds the app with the `bindings` tag and runs
# it to dump the bindings — about three seconds, so it is cheap enough to
# gate a commit on.

set -euo pipefail

cd "$(dirname "$0")/.."

TARGET="frontend/wailsjs"

if [ -n "$(git status --porcelain -- "$TARGET")" ]; then
	echo "bindings-check: $TARGET has uncommitted changes; stage or stash them first" >&2
	git status --short -- "$TARGET" >&2
	exit 1
fi

go tool wails generate module -tags webkit2_41 >/dev/null 2>&1

# `wails generate module` rewrites the three runtime files as 755 every
# time.  That is not drift, so compare content only.
if ! git -c core.fileMode=false diff --quiet -- "$TARGET"; then
	echo "bindings-check: $TARGET is out of date with the Go bindings." >&2
	echo "Run 'make bindings' and stage the result." >&2
	git -c core.fileMode=false diff --stat -- "$TARGET" >&2
	exit 1
fi

# Restore the modes the generator churned, so the tree is left clean.
chmod 644 \
	frontend/wailsjs/runtime/runtime.js \
	frontend/wailsjs/runtime/runtime.d.ts \
	frontend/wailsjs/runtime/package.json

echo "bindings-check: frontend/wailsjs is current"