#!/usr/bin/env bash
# Retarget this checkout's origin to the Hermit repo (canonical name).
# Safe to rerun. Does not rewrite history.
#
#   ./scripts/migrate_remote_to_hermit.sh
#   HERMIT_REMOTE_URL=… ./scripts/migrate_remote_to_hermit.sh
set -euo pipefail
ROOT="$(cd "$(dirname "$0")/.." && pwd)"
cd "$ROOT"

NEW_URL="${HERMIT_REMOTE_URL:-https://git.whcself.xyz/WHC/Hermit.git}"
OLD_HINT="CST-agent"

if [[ ! -d .git ]]; then
  echo "not a git checkout: $ROOT" >&2
  exit 1
fi

cur="$(git remote get-url origin 2>/dev/null || true)"
echo "==> current origin: ${cur:-"(none)"}"
echo "==> target origin:  $NEW_URL"

if [[ -n "$cur" && "$cur" == "$NEW_URL" ]]; then
  echo "already on Hermit remote"
else
  if git remote get-url origin >/dev/null 2>&1; then
    git remote set-url origin "$NEW_URL"
  else
    git remote add origin "$NEW_URL"
  fi
  # Keep a pointer at the old name for a while.
  if ! git remote get-url cst-agent >/dev/null 2>&1; then
    if [[ -n "$cur" && "$cur" == *"$OLD_HINT"* ]]; then
      git remote add cst-agent "$cur" || true
      echo "==> saved previous URL as remote 'cst-agent'"
    else
      git remote add cst-agent "https://git.whcself.xyz/WHC/CST-agent.git" || true
    fi
  fi
fi

git fetch origin
branch="$(git rev-parse --abbrev-ref HEAD)"
if git show-ref --verify --quiet "refs/remotes/origin/$branch"; then
  git branch --set-upstream-to="origin/$branch" "$branch" 2>/dev/null || true
fi

echo
echo "OK. Canonical repo: $NEW_URL"
echo "  git remote -v"
echo "  See MIGRATION.md for config / binary / env notes."
git remote -v