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

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
cd "$ROOT"

REMOTE="upstream-oxi"
URL="https://github.com/c0h1b4/oxi.git"

if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
  echo "error: RustBox must be a Git checkout before configuring Oxi upstream." >&2
  echo "Initialize it first:" >&2
  echo "  git init" >&2
  echo "  git add ." >&2
  echo "  git commit -m 'RustBox 0.0.1 baseline'" >&2
  exit 1
fi

if git remote get-url "$REMOTE" >/dev/null 2>&1; then
  current="$(git remote get-url "$REMOTE")"
  if [ "$current" != "$URL" ]; then
    echo "error: remote '$REMOTE' already points to: $current" >&2
    echo "expected: $URL" >&2
    exit 1
  fi
else
  git remote add "$REMOTE" "$URL"
fi

git fetch "$REMOTE" --tags

BASE="$(tr -d '[:space:]' < UPSTREAM_BASE)"
if ! git cat-file -e "$BASE^{commit}" 2>/dev/null; then
  echo "error: recorded Oxi base commit is not available after fetch: $BASE" >&2
  exit 1
fi

printf 'Oxi upstream configured.\n'
printf 'Remote: %s -> %s\n' "$REMOTE" "$URL"
printf 'Consumed Oxi baseline: %s\n' "$BASE"
printf 'Latest upstream-oxi/main: %s\n' "$(git rev-parse upstream-oxi/main)"