#!/bin/bash
# wisp-vpn-keepalive.sh — Check VPN status and reconnect if down
# Designed to run as a systemd timer every 5 minutes

VPN_SCRIPT="/root/.hermes/scripts/wisp-backup/home-router-vpn.sh"
STATUS_FILE="/tmp/wisp-vpn-status"

# Check if VPN is up
if "$VPN_SCRIPT" status >/dev/null 2>&1; then
    # VPN is up — write OK timestamp
    date +%s > "$STATUS_FILE"
    exit 0
else
    # VPN is down — attempt reconnect
    LAST_OK=$(cat "$STATUS_FILE" 2>/dev/null || echo "0")
    NOW=$(date +%s)
    ELAPSED=$((NOW - LAST_OK))

    echo "[-] WISP VPN is DOWN (was up ${ELAPSED}s ago). Attempting reconnect..."
    "$VPN_SCRIPT" up 2>&1

    if "$VPN_SCRIPT" status >/dev/null 2>&1; then
        echo "[+] WISP VPN reconnected successfully"
        date +%s > "$STATUS_FILE"
        exit 0
    else
        echo "[-] WISP VPN reconnect failed"
        exit 1
    fi
fi