#!/usr/bin/env bash
# Recursive submodule init for the rexglue SDK with self-healing for broken
# upstream pins.
#
# The rexglue fork pins several nested third-party submodules (imgui, ...) to
# commits their upstreams no longer carry, so a plain
# `git submodule update --init --recursive` aborts at the first broken pin
# and leaves every later nested submodule empty (a fresh clone cannot build).
# For each nested submodule still left empty, this script fetches its origin
# and checks out the default-branch tip, which is enough to build.
#
# Run from the repository root after `git submodule update --init` (top
# level). No-op when everything initialized fine.

set -uo pipefail

SDK="third_party/rexglue-sdk"
if [ ! -e "$SDK/.git" ]; then
  echo "init-submodules: $SDK is not initialized (run git submodule update --init first)"
  exit 1
fi

(
  cd "$SDK"
  git submodule update --init --recursive --jobs 4 >/tmp/ghost_sub_init.log 2>&1 || true

  while IFS= read -r path; do
    # A submodule needs self-healing when it has no .git, or its worktree
    # has no files other than the .git pointer (ls -A counts .git and would
    # wrongly treat an un-checked-out submodule as initialized).
    if [ ! -e "$path/.git" ] ||
       [ -z "$(find "$path" -mindepth 1 -maxdepth 1 ! -name '.git' -print -quit 2>/dev/null)" ]; then
      echo "init-submodules: self-healing empty submodule $path"
      if (cd "$path" && git fetch --depth 1 origin >/dev/null 2>&1 &&
          git checkout -q FETCH_HEAD >/dev/null 2>&1); then
        echo "  ok: $path -> $(git -C "$path" rev-parse --short HEAD)"
      else
        echo "  WARN: could not self-heal $path (build may fail on this dependency)"
      fi
    fi
  done < <(git config --file .gitmodules --get-regexp '^submodule\..*\.path$' | awk '{print $2}')
)

exit 0