#!/bin/sh

# Configuration
PING_HOST="1.1.1.1"
PING_WAIT=2
MAX_TRIES=4

# Function to log messages
wan_monitor() {
    echo "WAN Monitor: $@" | /usr/bin/logger -s
}

# Function to restart the WAN interface
restart_wan_interface() {
    wan_monitor "Force restarting WAN interface now..."
    service "restart_wan_if 0"  # Bring down the interface
    sleep 10                       # Wait for 10 seconds
    service "restart_wan_if 1"    # Bring up the interface
    wan_monitor "WAN interface is restarted."
}

# Function to perform a ping test
ping_test() {
    local count_tries=0
    local ping_test_passed=0
    wan_monitor "Running ping test..."

    while [ $count_tries -lt $MAX_TRIES ]; do
        if /bin/ping -c 1 -W $PING_WAIT $PING_HOST >/tmp/wan_check.log 2>&1; then
            ping_test_passed=1
            wan_monitor "Ping test succeeded within $PING_WAIT secs."
            return 0  # Return success
        else
            sleep 1
            count_tries=$((count_tries + 1))
            wan_monitor "Ping failed [$count_tries]"
        fi
    done

    return 1  # Return failure
}

# Main script execution
if ping_test; then
    wan_monitor "Internet was reachable. No need to restart WAN."
else
    wan_monitor "Pings failed. Internet must be down."
    restart_wan_interface
fi