#!/usr/bin/env bash
# infra/bin/wait-for-health URL TIMEOUT_SECONDS
#
# Poll a health endpoint until it returns 2xx, or exit 1 after
# TIMEOUT_SECONDS. Used as flystage's ExecStartPre against flysim's
# http://127.0.0.1:7401/healthz (docs/control-api.md: "200 when the loop
# advanced in the last 2 seconds, else 503").
set -euo pipefail

usage() { echo "usage: $0 URL TIMEOUT_SECONDS" >&2; exit 2; }

[ $# -eq 2 ] || usage
url="$1"
timeout="$2"

case "$timeout" in
    ''|*[!0-9]*) usage ;;
esac

deadline=$(( $(date +%s) + timeout ))
while true; do
    code="$(curl -fsS -o /dev/null -w '%{http_code}' "$url" 2>/dev/null || true)"
    case "$code" in
        2??) exit 0 ;;
    esac
    if [ "$(date +%s)" -ge "$deadline" ]; then
        echo "wait-for-health: $url not healthy after ${timeout}s (last code: ${code:-none})" >&2
        exit 1
    fi
    sleep 0.5
done