#!/usr/bin/env bash
# scripts/health-check.sh — poll /health/ready until 200 or timeout. Used as
# the post-start gate by deploy.sh. Returns non-zero on any failure.

set -euo pipefail
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
. "$SCRIPT_DIR/_lib.sh"

usage() {
    cat <<'EOF'
Usage: ./scripts/health-check.sh [--help]

Reads from the environment:
  DEPLOY_HOST_PORT      port the container is published on (default 4000)
  HEALTH_BASE_URL       full URL override; defaults to http://127.0.0.1:$DEPLOY_HOST_PORT
  HEALTH_TIMEOUT        seconds total to wait (default 60)
  HEALTH_INTERVAL       seconds between attempts (default 2)
EOF
}

[[ "${1:-}" == "--help" || "${1:-}" == "-h" ]] && { usage; exit 0; }

require_cmd curl
PORT="${DEPLOY_HOST_PORT:-4000}"
BASE_URL="${HEALTH_BASE_URL:-http://127.0.0.1:$PORT}"
TIMEOUT="${HEALTH_TIMEOUT:-60}"
INTERVAL="${HEALTH_INTERVAL:-2}"

# Liveness first (cheap; fails only if the process is wedged).
log_info "Probing $BASE_URL/health/live"
if ! curl --fail --silent --show-error --max-time 3 "$BASE_URL/health/live" >/dev/null; then
    die "/health/live did not return 200 — container is not responsive"
fi

log_info "Polling $BASE_URL/health/ready (timeout=${TIMEOUT}s, interval=${INTERVAL}s)"
DEADLINE=$(( $(date +%s) + TIMEOUT ))
ATTEMPT=0
while :; do
    ATTEMPT=$((ATTEMPT + 1))
    if BODY="$(curl --fail --silent --show-error --max-time 3 "$BASE_URL/health/ready" 2>/dev/null)"; then
        log_info "/health/ready returned 200 on attempt $ATTEMPT: $BODY"
        exit 0
    fi
    NOW=$(date +%s)
    if (( NOW >= DEADLINE )); then
        die "/health/ready did not return 200 within ${TIMEOUT}s (gave up after $ATTEMPT attempts)"
    fi
    sleep "$INTERVAL"
done