#!/usr/bin/env bash
# Fast, local sanity checks before a commit is allowed to happen.
#
# Deliberately dependency-free (plain bash + git + godot), matching the rest
# of tools/*.sh -- no pip install, no pre-commit framework, so `tools/install-hooks.sh`
# is the entire setup cost for a fresh clone.
#
# Scope: things that are cheap enough to run on every commit (a few seconds).
# The full end-to-end smoke test lives in pre-push instead, where 35s is a
# reasonable price to pay less often.
set -uo pipefail
cd "$(git rev-parse --show-toplevel)"

fail=0
staged=$(git diff --cached --name-only --diff-filter=ACMR)

if [[ -z "$staged" ]]; then
  exit 0
fi

echo "pre-commit checks..."

# --- Hygiene, on every commit, regardless of file type -----------------

if git diff --cached --check --diff-filter=ACMR | grep -q .; then
  echo "FAIL: unresolved merge conflict markers"
  git diff --cached --check --diff-filter=ACMR
  fail=1
fi

big=$(git diff --cached --diff-filter=ACMR --name-only -z | \
  xargs -0 -I{} du -k "{}" 2>/dev/null | awk '$1 > 5120 {print}')
if [[ -n "$big" ]]; then
  echo "FAIL: file(s) over 5MB staged -- game assets belong outside git history,"
  echo "      or need Git LFS if they truly must be tracked:"
  echo "$big" | sed 's/^/  /'
  fail=1
fi

if grep -qE '^\.godot/$' <(git diff --cached --name-only) 2>/dev/null || \
   git diff --cached --name-only | grep -qE '^\.godot/'; then
  echo "FAIL: .godot/ is generated (import cache + class cache) and must stay gitignored"
  fail=1
fi

# --- GDScript-specific, only when a .gd file is staged ------------------

# addons/ is vendored (GUT) -- not ours to hold to our own style or to parse-
# check on every commit; it never changes except on a deliberate upgrade.
gd_files=$(echo "$staged" | grep -E '\.gd$' | grep -vE '^addons/' || true)

if [[ -n "$gd_files" ]]; then
  # The Godot style guide (and every file in this repo) indents with tabs.
  # A stray space-indented line is almost always a paste from somewhere else
  # and silently breaks nothing today but fights every future diff.
  space_indented=""
  while IFS= read -r f; do
    [[ -f "$f" ]] || continue
    if grep -nP '^\t*  ' "$f" | grep -qv '^\s*#'; then
      space_indented+="$f"$'\n'
    fi
  done <<< "$gd_files"
  if [[ -n "$space_indented" ]]; then
    echo "FAIL: space-indented line(s) in (Godot style is tabs):"
    echo "$space_indented" | sed 's/^/  /'
    fail=1
  fi

  echo "  running tools/check.sh (parse check)..."
  if ! tools/check.sh; then
    fail=1
  fi

  echo "  running tools/test.sh (GUT suite)..."
  if ! tools/test.sh; then
    fail=1
  fi
fi

if [[ $fail -ne 0 ]]; then
  echo
  echo "pre-commit FAILED. Fix the above, or skip deliberately with --no-verify."
  exit 1
fi

echo "pre-commit OK"