#!/usr/bin/env luash
-- System Administration Demo: Real-world sysadmin tasks

print("=== System Administration with Luash ===\n")

-- System information gathering
print("1. System Information:")
os_name = `uname -s`
architecture = `uname -m`
uptime_info = `uptime`

print("   OS: " .. os_name)
print("   Architecture: " .. architecture)
print("   Uptime: " .. uptime_info)

-- Process management
print("\n2. Process Management:")
process_count = `ps aux | wc -l`
print("   Total processes: " .. process_count)

-- Check if important services are running
print("\n3. Service Status Check:")
services = {"ssh", "cron", "systemd"}
for i = 1, #services do
    local service = services[i]
    local result = `pgrep #{service} | wc -l`
    if tonumber(result) > 0 then
        print("   ✓ " .. service .. " is running")
    else
        print("   ✗ " .. service .. " not found")
    end
end

-- Disk usage analysis
print("\n4. Disk Usage:")
disk_usage = `df -h /`
print("   Root filesystem:")
!df -h / | tail -1

-- Log file analysis
print("\n5. Log Analysis:")
if `test -f /var/log/syslog && echo "exists"` == "exists" then
    print("   Recent system errors:")
    !tail -5 /var/log/syslog | grep -i error || echo "   No recent errors found"
else
    print("   Syslog not accessible (normal on macOS)")
end

-- Network connectivity check
print("\n6. Network Check:")
hosts_to_check = {"google.com", "github.com"}
for i = 1, #hosts_to_check do
    local host = hosts_to_check[i]
    local ping_result = `ping -c 1 #{host} >/dev/null 2>&1 && echo "ok" || echo "fail"`
    if ping_result == "ok" then
        print("   ✓ " .. host .. " is reachable")
    else
        print("   ✗ " .. host .. " is unreachable")
    end
end

-- Generate a simple system report
print("\n7. Generating System Report:")
$REPORT_DATE = `date`
report = "System Report - " .. $REPORT_DATE .. "\n"
report = report .. "User: " .. $USER .. "\n"
report = report .. "System: " .. os_name .. " " .. architecture .. "\n"
report = report .. "Processes: " .. process_count .. "\n"

-- Write report to file (using Lua's file operations)
local file = io.open("system_report.txt", "w")
if file then
    file:write(report)
    file:close()
    print("   Report saved to system_report.txt")
else
    print("   Failed to write report file")
end