#!/usr/bin/env python3
import json
import subprocess
import os
from http.server import BaseHTTPRequestHandler, HTTPServer

# --- CONFIGURATION FLAGS ---
PORT = 8080
IFACE = "bond0"

# Toggle features True/False depending on your setup
ENABLE_ZFS = False
ZPOOL = "rpool"

ENABLE_PVE_STATS = True  # Set to False if not running on Proxmox
# ---------------------------

def run_cmd(cmd):
    """Runs a shell command and silently returns None if it fails."""
    try:
        return subprocess.check_output(cmd, shell=True, stderr=subprocess.DEVNULL).decode('utf-8').strip()
    except Exception:
        return None

class MetricsHandler(BaseHTTPRequestHandler):
    def do_GET(self):
        if self.path == '/api/homelab':
            self.send_response(200)
            self.send_header('Content-type', 'application/json')
            self.send_header('Access-Control-Allow-Origin', '*') 
            self.end_headers()

            data = {}

            try:
                # 1. Network & CPU (Includes 1-second delay for accuracy)
                rx1 = int(run_cmd(f"cat /sys/class/net/{IFACE}/statistics/rx_bytes") or 0)
                tx1 = int(run_cmd(f"cat /sys/class/net/{IFACE}/statistics/tx_bytes") or 0)

                cpu_idle_str = run_cmd("vmstat 1 2 | tail -1 | awk '{print $15}'")
                cpu_idle = float(cpu_idle_str) if cpu_idle_str else 100.0
                data["cpu"] = round(100.0 - cpu_idle, 1)

                rx2 = int(run_cmd(f"cat /sys/class/net/{IFACE}/statistics/rx_bytes") or 0)
                tx2 = int(run_cmd(f"cat /sys/class/net/{IFACE}/statistics/tx_bytes") or 0)
                
                data["rx_mb"] = round((rx2 - rx1) / (1024 * 1024), 2)
                data["tx_mb"] = round((tx2 - tx1) / (1024 * 1024), 2)

                # 2. RAM Usage
                ram_str = run_cmd("free | grep Mem | awk '{print $3/$2 * 100.0}'")
                data["ram"] = round(float(ram_str), 1) if ram_str else 0.0

                # 3. Load Average (Pure Python)
                load1, load5, load15 = os.getloadavg()
                data["load_avg"] = [round(load1, 2), round(load5, 2), round(load15, 2)]

                # 4. Uptime in Days (Pure Python)
                with open('/proc/uptime', 'r') as f:
                    uptime_seconds = float(f.readline().split()[0])
                    data["uptime_days"] = round(uptime_seconds / 86400, 1)

                # 5. Root Disk Usage (Pure Python, lightning fast)
                st = os.statvfs('/')
                total = st.f_blocks * st.f_frsize
                free = st.f_bavail * st.f_frsize
                data["root_disk_pct"] = round(((total - free) / total) * 100.0, 1)

                # 6. CPU Temperature (Reads native thermal zone)
                try:
                    with open('/sys/class/thermal/thermal_zone0/temp', 'r') as f:
                        data["temp_c"] = round(int(f.read()) / 1000.0, 1)
                except Exception:
                    data["temp_c"] = "N/A" # Fails safely if hardware doesn't expose it

                # 7. ZFS Array (Optional)
                if ENABLE_ZFS:
                    zfs_alloc = run_cmd(f"zpool list -H -p -o allocated {ZPOOL}")
                    zfs_size = run_cmd(f"zpool list -H -p -o size {ZPOOL}")
                    if zfs_alloc and zfs_size:
                        data["zfs_pct"] = round((float(zfs_alloc) / float(zfs_size)) * 100.0, 1)
                    else:
                        data["zfs_pct"] = "Error"

                # 8. Proxmox VM/LXC Counts (Optional)
                if ENABLE_PVE_STATS:
                    data["vms_running"] = int(run_cmd("qm list | grep running | wc -l") or 0)
                    data["lxcs_running"] = int(run_cmd("pct list | grep running | wc -l") or 0)

                # Send payload
                self.wfile.write(json.dumps(data).encode())
                
            except Exception as e:
                self.wfile.write(json.dumps({"error": str(e)}).encode())
        else:
            self.send_response(404)
            self.end_headers()

if __name__ == '__main__':
    server = HTTPServer(('0.0.0.0', PORT), MetricsHandler)
    print(f"Starting homelab API on port {PORT}...")
    server.serve_forever()