#!/usr/bin/env python3
"""
Register an edge node with the central SmartClass server.

This script registers a new edge device (e.g., Raspberry Pi 5) with the central
server, establishing its identity and section assignment.

Usage:
    python scripts/register_edge_node.py --node-id rpi5-room301 --section AIML-3-A --ip 192.168.1.101
"""
import argparse
import json
import socket
import sys
import urllib.request
import urllib.error
from datetime import datetime


def get_system_info() -> dict:
    """Gather system information for registration."""
    import platform

    return {
        "hostname": socket.gethostname(),
        "platform": platform.platform(),
        "architecture": platform.machine(),
        "python_version": platform.python_version(),
    }


def register_node(
    api_url: str,
    node_id: str,
    section_key: str,
    ip_address: str,
    api_key: str = "",
) -> bool:
    """Register edge node with central API server."""
    system_info = get_system_info()

    payload = {
        "node_id": node_id,
        "section_key": section_key,
        "ip_address": ip_address,
        "hostname": system_info["hostname"],
        "platform": system_info["platform"],
        "architecture": system_info["architecture"],
        "registered_at": datetime.now().isoformat(),
    }

    print(f"📡 Registering edge node: {node_id}")
    print(f"   Section: {section_key}")
    print(f"   IP: {ip_address}")
    print(f"   Hostname: {system_info['hostname']}")

    headers = {
        "Content-Type": "application/json",
    }
    if api_key:
        headers["Authorization"] = f"Bearer {api_key}"

    try:
        data = json.dumps(payload).encode("utf-8")
        req = urllib.request.Request(
            f"{api_url}/api/v1/edge-nodes/register",
            data=data,
            headers=headers,
            method="POST",
        )
        with urllib.request.urlopen(req, timeout=15) as resp:
            result = json.loads(resp.read().decode())
            print(f"\n✅ Registration successful!")
            print(f"   Node ID: {result.get('node_id', node_id)}")
            print(f"   Status: {result.get('status', 'registered')}")
            return True

    except urllib.error.HTTPError as e:
        body = e.read().decode() if e.fp else ""
        print(f"\n❌ Registration failed: HTTP {e.code}")
        print(f"   Response: {body[:200]}")
        return False

    except urllib.error.URLError as e:
        print(f"\n❌ Connection failed: {e.reason}")
        print(f"   Is the API server running at {api_url}?")
        return False


def main():
    parser = argparse.ArgumentParser(description="Register SmartClass edge node")
    parser.add_argument("--node-id", required=True, help="Unique node identifier")
    parser.add_argument("--section", required=True, help="Section key (e.g., AIML-3-A)")
    parser.add_argument("--ip", default="", help="Node IP address (auto-detected if empty)")
    parser.add_argument("--api-url", default="http://localhost:8000", help="Central API URL")
    parser.add_argument("--api-key", default="", help="API authentication key")

    args = parser.parse_args()

    # Auto-detect IP if not provided
    ip_address = args.ip
    if not ip_address:
        try:
            s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
            s.connect(("8.8.8.8", 80))
            ip_address = s.getsockname()[0]
            s.close()
        except Exception:
            ip_address = "127.0.0.1"

    success = register_node(
        api_url=args.api_url,
        node_id=args.node_id,
        section_key=args.section,
        ip_address=ip_address,
        api_key=args.api_key,
    )

    sys.exit(0 if success else 1)


if __name__ == "__main__":
    main()