#!/usr/bin/env bash

set -euo pipefail

max_attempts="${GENARRATIVE_CI_NPM_CI_ATTEMPTS:-3}"
base_delay_seconds="${GENARRATIVE_CI_NPM_CI_RETRY_DELAY_SECONDS:-5}"

if [[ ! "${max_attempts}" =~ ^[1-9][0-9]*$ ]]; then
  echo 'GENARRATIVE_CI_NPM_CI_ATTEMPTS must be a positive integer.' >&2
  exit 2
fi
if [[ ! "${base_delay_seconds}" =~ ^[0-9]+$ ]]; then
  echo 'GENARRATIVE_CI_NPM_CI_RETRY_DELAY_SECONDS must be a non-negative integer.' >&2
  exit 2
fi

for attempt in $(seq 1 "${max_attempts}"); do
  if npm ci "$@"; then
    exit 0
  fi
  if [[ "${attempt}" -eq "${max_attempts}" ]]; then
    echo "npm ci failed after ${max_attempts} attempts." >&2
    exit 1
  fi
  sleep "$((attempt * base_delay_seconds))"
done