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

workspace_root="${1:-$PWD}"
workspace_root="$(cd "$workspace_root" && pwd)"
cd "$workspace_root"

if [[ ! -f .gitmodules ]]; then
  echo "Workspace .gitmodules was not found: $workspace_root" >&2
  exit 1
fi

mapfile -t declared_paths < <(
  git config --file .gitmodules --get-regexp '^submodule\..*\.path$' |
    awk '{ print $2 }'
)

if [[ "${#declared_paths[@]}" -eq 0 ]]; then
  echo "No submodules are declared in .gitmodules." >&2
  exit 1
fi

mapfile -t top_level_status < <(git submodule status)
if [[ "${#top_level_status[@]}" -ne "${#declared_paths[@]}" ]]; then
  echo "Submodule count mismatch: declared=${#declared_paths[@]} status=${#top_level_status[@]}" >&2
  exit 1
fi

for relative_path in "${declared_paths[@]}"; do
  if [[ ! -e "$relative_path/.git" ]]; then
    echo "Declared submodule is not initialized: $relative_path" >&2
    exit 1
  fi
done

recursive_status="$(git submodule status --recursive)"
if grep -Eq '^[+-U]' <<<"$recursive_status"; then
  echo "One or more submodules are missing, conflicted, or not at the recorded revision:" >&2
  grep -E '^[+-U]' <<<"$recursive_status" >&2
  exit 1
fi

printf '%s\n' "$recursive_status"
echo "Submodule validation passed: declared=${#declared_paths[@]}"