#!/usr/bin/env bash
set -euo pipefail

repo_root="$(git rev-parse --show-toplevel)"
cd "$repo_root"

echo "pre-push: checking for a clean working tree"
if [[ -n "$(git status --porcelain)" ]]; then
	echo "pre-push: refuse to push — working tree is not clean. Commit, stash, or remove changes first:" >&2
	git status --short >&2
	exit 1
fi

zero_sha="0000000000000000000000000000000000000000"
gd_changed_files=()

collect_gd_changes_in_range() {
	local range="$1"
	while IFS= read -r -d '' path; do
		gd_changed_files+=("$path")
	done < <(
		git diff --name-only -z --diff-filter=ACMR "$range" -- \
			'client/scripts/*.gd' 'client/test/*.gd' 2>/dev/null || true
	)
}

read_any_ref=false
while read -r local_ref local_sha remote_ref remote_sha; do
	read_any_ref=true
	if [[ "$local_sha" == "$zero_sha" ]]; then
		continue
	fi

	local range=""
	if [[ "$remote_sha" == "$zero_sha" ]]; then
		local base=""
		if git show-ref --verify --quiet refs/remotes/origin/main; then
			base="$(git merge-base origin/main "$local_sha" 2>/dev/null || true)"
		fi
		if [[ -z "$base" ]] && git show-ref --verify --quiet refs/heads/main; then
			base="$(git merge-base main "$local_sha" 2>/dev/null || true)"
		fi
		if [[ -n "$base" ]]; then
			range="${base}..${local_sha}"
		else
			range="$local_sha"
		fi
	else
		range="${remote_sha}..${local_sha}"
	fi

	collect_gd_changes_in_range "$range"
done

# Fallback when stdin is empty (non-standard invocations).
if [[ "$read_any_ref" == false ]]; then
	local head_sha
	head_sha="$(git rev-parse HEAD)"
	local base=""
	if git show-ref --verify --quiet refs/remotes/origin/main; then
		base="$(git merge-base origin/main "$head_sha" 2>/dev/null || true)"
	fi
	if [[ -z "$base" ]] && git show-ref --verify --quiet refs/heads/main; then
		base="$(git merge-base main "$head_sha" 2>/dev/null || true)"
	fi
	if [[ -n "$base" ]]; then
		collect_gd_changes_in_range "${base}..${head_sha}"
	else
		collect_gd_changes_in_range "$head_sha"
	fi
fi

if [[ ${#gd_changed_files[@]} -eq 0 ]]; then
	echo "pre-push: no client/scripts or client/test .gd changes in push — skipping gdlint/gdformat"
	exit 0
fi

gdlint_bin=""
gdformat_bin=""

if [[ -x "$repo_root/.venv-gd/bin/gdlint" ]]; then
	gdlint_bin="$repo_root/.venv-gd/bin/gdlint"
elif [[ -x "$repo_root/.venv-gd/Scripts/gdlint.exe" ]]; then
	gdlint_bin="$repo_root/.venv-gd/Scripts/gdlint.exe"
elif command -v gdlint >/dev/null 2>&1; then
	gdlint_bin="$(command -v gdlint)"
fi

if [[ -x "$repo_root/.venv-gd/bin/gdformat" ]]; then
	gdformat_bin="$repo_root/.venv-gd/bin/gdformat"
elif [[ -x "$repo_root/.venv-gd/Scripts/gdformat.exe" ]]; then
	gdformat_bin="$repo_root/.venv-gd/Scripts/gdformat.exe"
elif command -v gdformat >/dev/null 2>&1; then
	gdformat_bin="$(command -v gdformat)"
fi

if [[ -z "$gdlint_bin" || -z "$gdformat_bin" ]]; then
	echo "pre-push: missing gdtoolkit commands (gdlint/gdformat)." >&2
	echo "Install locally with:" >&2
	echo "  python3 -m venv .venv-gd" >&2
	echo "  .venv-gd/bin/pip install \"gdtoolkit==4.5.0\"" >&2
	exit 1
fi

echo "pre-push: client .gd changes detected — running gdlint and gdformat --check"
printf '  %s\n' "${gd_changed_files[@]}"

echo "pre-push: running gdlint on client/scripts and client/test"
"$gdlint_bin" client/scripts client/test

echo "pre-push: running gdformat --check on client/scripts and client/test"
"$gdformat_bin" --check client/scripts client/test