#!/bin/bash
# System info reporter - outputs JSON with verifiable data
set -euo pipefail

# Get hostname
HOSTNAME=$(hostname 2>/dev/null || echo "unknown")

# Get kernel version
KERNEL=$(uname -r 2>/dev/null || echo "unknown")

# Get OS info (try multiple methods)
if [[ -f /etc/os-release ]]; then
    OS_NAME=$(grep '^NAME=' /etc/os-release 2>/dev/null | cut -d'=' -f2 | tr -d '"' || echo "unknown")
    OS_VERSION=$(grep '^VERSION=' /etc/os-release 2>/dev/null | cut -d'=' -f2 | tr -d '"' || echo "unknown")
else
    OS_NAME="unknown"
    OS_VERSION="unknown"
fi

# Get disk usage for root filesystem
DISK_TOTAL=$(df -h / 2>/dev/null | awk 'NR==2 {print $2}' || echo "0")
DISK_USED=$(df -h / 2>/dev/null | awk 'NR==2 {print $3}' || echo "0")
DISK_AVAIL=$(df -h / 2>/dev/null | awk 'NR==2 {print $4}' || echo "0")
DISK_PERCENT=$(df -h / 2>/dev/null | awk 'NR==2 {print $5}' | tr -d '%' || echo "0")

# Get memory info
if [[ -f /proc/meminfo ]]; then
    MEM_TOTAL_KB=$(awk '/MemTotal/ {print $2}' /proc/meminfo 2>/dev/null || echo "0")
    MEM_FREE_KB=$(awk '/MemFree/ {print $2}' /proc/meminfo 2>/dev/null || echo "0")
    MEM_TOTAL_GB=$(echo "scale=2; $MEM_TOTAL_KB/1048576" | bc 2>/dev/null || echo "0")
else
    MEM_TOTAL_GB=0
fi

# Get current user
CURRENT_USER=$(whoami 2>/dev/null || echo "unknown")

# Get current working directory
CWD=$(pwd 2>/dev/null || echo "unknown")

# Count processes
PROCESS_COUNT=$(ps aux 2>/dev/null | wc -l || echo "0")

# Output JSON
cat <<EOF
{
  "hostname": "$HOSTNAME",
  "kernel": "$KERNEL",
  "os": {
    "name": "$OS_NAME",
    "version": "$OS_VERSION"
  },
  "disk": {
    "total": "$DISK_TOTAL",
    "used": "$DISK_USED",
    "available": "$DISK_AVAIL",
    "percent_used": $DISK_PERCENT
  },
  "memory": {
    "total_gb": $MEM_TOTAL_GB
  },
  "user": "$CURRENT_USER",
  "working_directory": "$CWD",
  "process_count": $PROCESS_COUNT
}
EOF