#!/usr/bin/env sh
set -eu

failed=0
cr=$(printf '\r')

staged_shell_files=$(git diff --cached --name-only --diff-filter=ACMR | grep -E '\.sh$' || true)
staged_markdown_files=$(git diff --cached --name-only --diff-filter=ACMR | grep -E '\.md$' || true)

for file in $staged_shell_files; do
  mode=$(git ls-files --stage -- "$file" | awk '{print $1}')
  if [ "$mode" != "100755" ]; then
    echo "ERROR: $file is not executable in Git index. Run: git add --chmod=+x $file" >&2
    failed=1
  fi

  if git show ":$file" | grep -q "$cr"; then
    echo "ERROR: $file contains CRLF in staged content. Use LF line endings." >&2
    failed=1
  fi
done

if [ -n "$staged_markdown_files" ]; then
  if ! command -v markdownlint >/dev/null 2>&1; then
    echo "ERROR: markdownlint is required to validate staged Markdown files (.md)." >&2
    echo "Install with npm: npm install --global markdownlint-cli" >&2
    failed=1
  else
    # Validate the staged markdown files currently present in the working tree.
    # This keeps the hook simple and fast for standard project usage.
    if ! markdownlint $staged_markdown_files; then
      failed=1
    fi
  fi
fi

if [ "$failed" -ne 0 ]; then
  echo "Pre-commit check failed." >&2
  exit 1
fi