#!/usr/bin/env bash
# wait-for-url.sh — curl with retry until success or attempts exhausted.
#
# Usage: wait-for-url.sh <url> [<max-attempts>] [<delay-seconds>]
# Env (optional): BASIC_AUTH_USER, BASIC_AUTH_PASS — if set, sent as basic auth.
set -euo pipefail

URL="${1:-}"
MAX_ATTEMPTS="${2:-30}"
DELAY="${3:-2}"

if [ -z "$URL" ]; then
  echo "usage: $0 <url> [<max-attempts>] [<delay-seconds>]" >&2
  exit 2
fi

# bash 3.2-safe: expand array only when non-empty.
AUTH_ARGS=()
if [ -n "${BASIC_AUTH_USER:-}" ] && [ -n "${BASIC_AUTH_PASS:-}" ]; then
  AUTH_ARGS=(--user "${BASIC_AUTH_USER}:${BASIC_AUTH_PASS}")
fi

attempt=1
while [ "$attempt" -le "$MAX_ATTEMPTS" ]; do
  if curl -fsS ${AUTH_ARGS[@]+"${AUTH_ARGS[@]}"} -o /dev/null "$URL"; then
    echo "ok: $URL ($attempt attempt(s))"
    exit 0
  fi
  if [ "$attempt" -lt "$MAX_ATTEMPTS" ]; then
    sleep "$DELAY"
  fi
  attempt=$((attempt + 1))
done

echo "fail: $URL did not return 2xx after $MAX_ATTEMPTS attempts" >&2
exit 1