#!/usr/bin/env bash
#
# Pre-commit hook that runs CI-equivalent checks locally.
# Classifies staged files by type and only runs relevant make
# targets. Falls back to the full `make pre-commit` when the
# Makefile changed or CODER_HOOK_RUN_ALL=1 is set.
#
# Installation (worktree-compatible):
#
#   git config core.hooksPath scripts/githooks
#
# Bypass: git commit --no-verify

set -euo pipefail

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

# Unset all repo-local Git env vars, not just GIT_DIR. In linked
# worktrees the hook inherits variables like GIT_COMMON_DIR and
# GIT_INDEX_FILE that confuse child processes (notably Go's VCS
# stamping, which shells out to git and gets exit status 128).
# Process substitution (not a pipe) so unset runs in the current shell.
while IFS= read -r var; do
	unset "$var"
done < <(git rev-parse --local-env-vars)

# In linked worktrees, set worktree-scoped hooksPath to override shared config.
if [[ "$(git rev-parse --git-dir)" != "$(git rev-parse --git-common-dir)" ]]; then
	git config --worktree core.hooksPath scripts/githooks
fi

if [[ ${CODER_HOOK_RUN_ALL:-} == 1 ]]; then
	exec make pre-commit
fi

staged=$(git diff --cached --name-only --diff-filter=d)
if [[ -z $staged ]]; then
	echo "pre-commit: no staged changes, skipping"
	exit 0
fi

# If Go, TS, or build-system files changed, run the full
# pre-commit. Otherwise run the lightweight target that
# covers everything except gen, Go/TS fmt+lint, and binary build.
if echo "$staged" | grep -qE '\.(go|ts|tsx|sql|proto)$|^go\.(mod|sum)$|^site/|^Makefile$'; then
	exec make pre-commit
fi
exec make pre-commit-light