"""
Device information management
Handles hostname and IP address of the device
Uses file-based configuration for reliability
"""

import os
from config_settings import DEVICE_INFO_FILE


def get_device_info():
    """
    Get device hostname and IP from configuration file
    Returns tuple: (hostname, device_ip)
    
    The hostname and IP are read from device_info.txt which should be
    configured with the device's own hostname and IP address.
    """
    hostname = None
    device_ip = None
    
    # Load device info from file (primary method - no socket resolution)
    try:
        os.makedirs(os.path.dirname(DEVICE_INFO_FILE), exist_ok=True)
        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"Device Info - Hostname: {hostname}, IP: {device_ip}")
                return hostname, device_ip
            else:
                print(f"Warning: {DEVICE_INFO_FILE} exists but lacks valid data")
    except FileNotFoundError:
        print(f"Device info file not found at {DEVICE_INFO_FILE}")
    except Exception as e:
        print(f"Error reading device info file: {e}")
    
    # Fallback if file doesn't exist or has issues
    print("Using default device values")
    hostname = "prezenta-device"
    device_ip = "192.168.1.100"
    
    # Create file with default values for future use
    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"Created device info file with defaults: {hostname}, {device_ip}")
    except Exception as e:
        print(f"Warning: Could not create device info file: {e}")
    
    return hostname, device_ip