#!/bin/sh
# Oikos watchdog — cron job running every 2 minutes on mac-mini.
# Pages the operator via Matrix if the API is down.
# Register: crontab -e → */2 * * * * /opt/oikos/scripts/watchdog.sh

set -e

API_URL="${API_URL:-http://localhost:8090/healthz}"
MATRIX_HOMESERVER="${MATRIX_HOMESERVER:-https://matrix.hubris.network}"
MATRIX_ROOM="${MATRIX_ROOM:-!alerts:hubris.network}"
MATRIX_TOKEN="${MATRIX_TOKEN:-}"
MAX_FAILS=${MAX_FAILS:-3}
FAIL_FILE="/tmp/oikos-watchdog-failures"

health() {
    curl -sf --max-time 5 "$API_URL" > /dev/null 2>&1
}

if health; then
    # Reset failure count
    echo "0" > "$FAIL_FILE" 2>/dev/null || true
    exit 0
fi

# Increment failure count
fails=$(cat "$FAIL_FILE" 2>/dev/null || echo 0)
fails=$((fails + 1))
echo "$fails" > "$FAIL_FILE"

if [ "$fails" -ge "$MAX_FAILS" ]; then
    # Page the operator via Matrix
    msg="ALERT: oikos API is DOWN ($MAX_FAILS consecutive failures at $(date))"
    if [ -n "$MATRIX_TOKEN" ]; then
        curl -sf -X POST "$MATRIX_HOMESERVER/_matrix/client/v3/rooms/$MATRIX_ROOM/send/m.room.message" \
            -H "Authorization: Bearer $MATRIX_TOKEN" \
            -H "Content-Type: application/json" \
            -d "{\"msgtype\":\"m.text\",\"body\":\"$msg\"}" > /dev/null 2>&1
    fi
    echo "$msg" | logger -t oikos-watchdog
fi