"""
Device information management
Handles hostname, IP address, and device configuration
"""

import socket
import os
from config_settings import DEVICE_INFO_FILE


def get_device_info():
    """
    Get hostname and device IP with file-based fallback
    Returns tuple: (hostname, device_ip)
    """
    hostname = None
    device_ip = None
    
    # Try to get current hostname and IP
    try:
        hostname = socket.gethostname()
        device_ip = socket.gethostbyname(hostname)
        print(f"Successfully resolved - Hostname: {hostname}, IP: {device_ip}")
        
        # Save the working values to file for future fallback
        try:
            os.makedirs(os.path.dirname(DEVICE_INFO_FILE), exist_ok=True)
            with open(DEVICE_INFO_FILE, "w") as f:
                f.write(f"{hostname}\n{device_ip}\n")
            print(f"Saved device info to {DEVICE_INFO_FILE}")
        except Exception as e:
            print(f"Warning: Could not save device info to file: {e}")
            
        return hostname, device_ip
        
    except socket.gaierror as e:
        print(f"Socket error occurred: {e}")
        print("Attempting to load device info from file...")
        
        # Try to load from file
        try:
            with open(DEVICE_INFO_FILE, "r") as f:
                lines = f.read().strip().split('\n')
                if len(lines) >= 2:
                    hostname = lines[0].strip()
                    device_ip = lines[1].strip()
                    print(f"Loaded from file - Hostname: {hostname}, IP: {device_ip}")
                    return hostname, device_ip
                else:
                    print("File exists but doesn't contain valid data")
        except FileNotFoundError:
            print(f"No fallback file found at {DEVICE_INFO_FILE}")
        except Exception as e:
            print(f"Error reading fallback file: {e}")
    
    except Exception as e:
        print(f"Unexpected error getting device info: {e}")
        
        # Try to load from file as fallback
        try:
            with open(DEVICE_INFO_FILE, "r") as f:
                lines = f.read().strip().split('\n')
                if len(lines) >= 2:
                    hostname = lines[0].strip()
                    device_ip = lines[1].strip()
                    print(f"Loaded from file after error - Hostname: {hostname}, IP: {device_ip}")
                    return hostname, device_ip
        except Exception as file_error:
            print(f"Could not load from file: {file_error}")
    
    # Final fallback if everything fails
    print("All methods failed - Using default values")
    hostname = hostname or "unknown-device"
    device_ip = "127.0.0.1"
    
    # Try to save these default values for next time
    try:
        os.makedirs(os.path.dirname(DEVICE_INFO_FILE), exist_ok=True)
        with open(DEVICE_INFO_FILE, "w") as f:
            f.write(f"{hostname}\n{device_ip}\n")
        print(f"Saved fallback values to {DEVICE_INFO_FILE}")
    except Exception as e:
        print(f"Could not save fallback values: {e}")
    
    return hostname, device_ip