#!/usr/bin/env sh
set -eu

FAILED_UNIT="${1:-qsfera-rpi-production-check.service}"
JOURNAL_LINES="${QSFERA_ALERT_JOURNAL_LINES:-80}"
HOSTNAME_VALUE="$(hostname -f 2>/dev/null || hostname)"
TIMESTAMP_UTC="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
SUMMARY="QSfera Raspberry Pi production check failed on ${HOSTNAME_VALUE}: ${FAILED_UNIT} at ${TIMESTAMP_UTC}"

if command -v journalctl >/dev/null 2>&1; then
    JOURNAL_OUTPUT="$(journalctl -u "$FAILED_UNIT" -n "$JOURNAL_LINES" --no-pager 2>/dev/null || true)"
else
    JOURNAL_OUTPUT=""
fi

{
    echo "$SUMMARY"
    if [ -n "$JOURNAL_OUTPUT" ]; then
        echo
        echo "$JOURNAL_OUTPUT"
    fi
} | if command -v systemd-cat >/dev/null 2>&1; then
    systemd-cat -t qsfera-rpi-production-alert -p err
else
    cat >&2
fi

if [ -n "${QSFERA_ALERT_WEBHOOK_URL:-}" ]; then
    if ! command -v python3 >/dev/null 2>&1; then
        echo "ERROR: python3 is required to format the alert webhook payload." >&2
        exit 1
    fi
    if ! command -v curl >/dev/null 2>&1; then
        echo "ERROR: curl is required to send the alert webhook." >&2
        exit 1
    fi

    python3 - "$SUMMARY" "$FAILED_UNIT" "$HOSTNAME_VALUE" "$TIMESTAMP_UTC" "$JOURNAL_OUTPUT" <<'PY' |
import json
import sys

summary, failed_unit, hostname, timestamp_utc, journal = sys.argv[1:]
print(json.dumps({
    "summary": summary,
    "failedUnit": failed_unit,
    "host": hostname,
    "timestampUtc": timestamp_utc,
    "journal": journal,
}, ensure_ascii=False))
PY
    curl -fsS \
        -X POST \
        -H "Content-Type: application/json" \
        --data-binary @- \
        "$QSFERA_ALERT_WEBHOOK_URL" >/dev/null
fi