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

OUT_PATH="${1:-}"

usage() {
  cat <<'EOF'
Usage: scripts/00_2_generate_ccr.sh OUT.ccr

Generate a small deterministic CCR snapshot for pre-check.
This script writes a fixed base64-encoded CCR fixture and does not require Python.
The generated snapshot contains:
  - VRP: 10.0.0.0/24 maxLen 24 AS65001
  - VRP: 10.0.1.0/24 maxLen 24 AS65003
  - VRP: 2001:db8:1::/48 maxLen 48 AS65002
  - ASPA: customer AS65010 providers AS65011, AS65012, AS65013
  - ASPA: customer AS65020 provider AS65021
EOF
}

die() {
  printf '[00_2_generate_ccr] ERROR: %s\n' "$*" >&2
  exit 1
}

if [ "${OUT_PATH}" = "-h" ] || [ "${OUT_PATH}" = "--help" ]; then
  usage
  exit 0
fi

[ -n "${OUT_PATH}" ] || die "missing OUT.ccr"
mkdir -p "$(dirname "${OUT_PATH}")"

decode_base64() {
  if command -v base64 >/dev/null 2>&1; then
    base64 -d
    return
  fi

  if command -v openssl >/dev/null 2>&1; then
    openssl base64 -d
    return
  fi

  die "base64 or openssl command is required to write CCR fixture"
}

cat <<'EOF' | decode_base64 >"${OUT_PATH}"
MIIBAwYLKoZIhvcNAQkQATaggfMwgfACAQAwDQYJYIZIAWUDBAIBBQAYDzIwMjYwNDAzMDAwMjAx
WqJ9MHswVzAaAgMA/ekwEzARBAIAATALMAkDBAAKAAACARgwGgIDAP3rMBMwEQQCAAEwCzAJAwQA
CgABAgEYMB0CAwD96jAWMBQEAgACMA4wDAMHACABDbgAAQIBMAQgsUgCHfy5AJcFp5RymOD0HuGO
wfhoWpll90ugYECGQPSjTDBKMCYwFgIDAP3yMA8CAwD98wIDAP30AgMA/fUwDAIDAP38MAUCAwD9
/QQgRPxVPOOUsUuuV4tZ8BG5PHNtKiaEr23Ird+yNxlWJ+w=
EOF