#!/bin/sh
# SecuBox LED Pulse - Tri-Color Status with Critical Alert Mode
# Original from OpenWrt secubox-openwrt (overlay filesystem)
# Reference only - Debian uses 3-tier LED system instead
#
# Matches control panel (port 8511) + SPUNK ALERT for critical failures

LED_GREEN1='/sys/class/leds/green:led1'
LED_RED1='/sys/class/leds/red:led1'
LED_BLUE1='/sys/class/leds/blue:led1'

CACHE_FILE="/tmp/secubox/health-status.json"

led_set() {
    local led="$1" val="$2"
    echo "${val:-0}" > "$led/brightness" 2>/dev/null
}

set_color() {
    local r="$1" g="$2" b="$3"
    led_set "$LED_RED1" "$r"
    led_set "$LED_GREEN1" "$g"
    led_set "$LED_BLUE1" "$b"
}

all_off() { set_color 0 0 0; }

get_json_val() {
    local key="$1"
    jsonfilter -i "$CACHE_FILE" -e "@.$key" 2>/dev/null
}

# Check for CRITICAL services - these trigger SPUNK ALERT
check_critical_services() {
    local critical=0

    # HAProxy must be running (PERMANENT priority)
    if ! pgrep haproxy >/dev/null 2>&1; then
        critical=1
    fi

    # CrowdSec must be running (URGENT priority)
    if ! pgrep crowdsec >/dev/null 2>&1; then
        critical=1
    fi

    # Check if services are down from cache
    local haproxy_ok=$(get_json_val "services.haproxy")
    local crowdsec_ok=$(get_json_val "services.crowdsec")

    [ "$haproxy_ok" = "0" ] && critical=1
    [ "$crowdsec_ok" = "0" ] && critical=1

    return $critical
}

# SPUNK ALERT - Rapid red flashing for critical failures
spunk_alert() {
    echo "SPUNK ALERT - Critical service down!" >&2
    echo "CRITICAL" > /tmp/secubox/led-status

    local i
    for i in 1 2 3 4 5; do
        # Rapid red flash
        set_color 255 0 0
        local x=0; while [ $x -lt 25000 ]; do x=$((x+1)); done
        all_off
        x=0; while [ $x -lt 25000 ]; do x=$((x+1)); done
    done

    # Brief pause before next check
    sleep 1
}

# Calculate colors based on metrics
calc_health_color() {
    local score=$(get_json_val "score")
    [ -z "$score" ] && score=100
    if [ "$score" -ge 80 ]; then echo "green"
    elif [ "$score" -ge 50 ]; then echo "yellow"
    else echo "red"; fi
}

calc_cpu_color() {
    local cpu=$(get_json_val "resources.cpu_load" | cut -d'.' -f1)
    [ -z "$cpu" ] && cpu=0
    local pct=$((cpu * 25))
    if [ "$pct" -lt 60 ]; then echo "green"
    elif [ "$pct" -lt 85 ]; then echo "yellow"
    else echo "red"; fi
}

calc_mem_color() {
    local mem=$(get_json_val "resources.memory_percent")
    [ -z "$mem" ] && mem=50
    if [ "$mem" -lt 60 ]; then echo "green"
    elif [ "$mem" -lt 85 ]; then echo "yellow"
    else echo "red"; fi
}

# Pulse with specific color
pulse_color() {
    case "$1" in
        green)  set_color 0 255 0 ;;
        yellow) set_color 255 165 0 ;;
        red)    set_color 255 0 0 ;;
        cyan)   set_color 0 255 255 ;;
        *)      set_color 0 128 0 ;;
    esac
}

dim_color() {
    case "$1" in
        green)  set_color 0 64 0 ;;
        yellow) set_color 64 42 0 ;;
        red)    set_color 64 0 0 ;;
        cyan)   set_color 0 64 64 ;;
        *)      set_color 0 32 0 ;;
    esac
}

# Busy wait for ms (BusyBox compatible)
busy_wait() {
    local count=$(($1 * 100))
    local x=0
    while [ $x -lt $count ]; do x=$((x+1)); done
}

echo 'SecuBox LED Tri-Color + SPUNK ALERT starting...'
all_off

# Main loop
while true; do
    # PRIORITY 1: Check for critical service failures
    if ! check_critical_services; then
        spunk_alert
        continue
    fi

    # Normal operation: Tri-color heartbeat
    health_color=$(calc_health_color)
    cpu_color=$(calc_cpu_color)
    mem_color=$(calc_mem_color)

    echo "$health_color $cpu_color $mem_color" > /tmp/secubox/led-status

    # Triple-pulse cascade (Health -> CPU -> Memory)
    # Pulse 1: Health
    pulse_color "$health_color"
    busy_wait 150
    dim_color "$health_color"
    busy_wait 100

    # Pulse 2: CPU
    pulse_color "$cpu_color"
    busy_wait 150
    dim_color "$cpu_color"
    busy_wait 100

    # Pulse 3: Memory
    pulse_color "$mem_color"
    busy_wait 150
    all_off
    busy_wait 500

    # Pause between heartbeats
    sleep 1
done