"""
Network connectivity and backup data handling
"""

import subprocess
import time
import requests
import logging
from config_settings import CONNECTIVITY_CHECK_HOST, CONNECTIVITY_CHECK_INTERVAL, TAG_FILE
from logger_module import log_with_server


def check_internet_connection(hostname, device_ip, on_connect_callback=None):
    """
    Check internet connection periodically
    
    Args:
        hostname: Device hostname
        device_ip: Device IP
        on_connect_callback: Optional callback function when internet is restored
    """
    log_with_server('Internet connection check loaded', hostname, device_ip)
    
    while True:
        try:
            # Check connection to the specified host
            response = subprocess.run(
                ["ping", "-c", "1", CONNECTIVITY_CHECK_HOST],
                stdout=subprocess.DEVNULL,
                stderr=subprocess.DEVNULL,
                timeout=5
            )
            
            if response.returncode == 0:
                log_with_server(f"Internet is up! Waiting {CONNECTIVITY_CHECK_INTERVAL}s.", hostname, device_ip)
                
                # Call callback if internet restored
                if on_connect_callback:
                    try:
                        on_connect_callback()
                    except Exception as e:
                        log_with_server(f"Callback error: {e}", hostname, device_ip)
                
                time.sleep(CONNECTIVITY_CHECK_INTERVAL)
            else:
                log_with_server("Internet is down", hostname, device_ip)
                time.sleep(10)  # Retry every 10 seconds when offline
                
        except subprocess.TimeoutExpired:
            log_with_server("Ping timeout", hostname, device_ip)
            time.sleep(10)
        except Exception as e:
            log_with_server(f"Connection check error: {e}", hostname, device_ip)
            time.sleep(10)


def post_backup_data(hostname, device_ip):
    """
    Post backup data to Harting server
    Reads URLs from tag.txt and attempts to POST to each one
    
    Args:
        hostname: Device hostname
        device_ip: Device IP
    """
    try:
        with open(TAG_FILE, "r") as file:
            lines = file.readlines()
        
        remaining_lines = lines[:]
        
        for line in lines:
            line = line.strip()
            if line:
                try:
                    response = requests.post(line, verify=False, timeout=3)
                    response.raise_for_status()
                    log_with_server(f"Data posted successfully to {line}", hostname, device_ip)
                    remaining_lines.remove(line + "\n")
                except requests.exceptions.Timeout:
                    log_with_server("Request timed out.", hostname, device_ip)
                    break
                except requests.exceptions.RequestException as e:
                    log_with_server(f"An error occurred posting data: {e}", hostname, device_ip)
                    break
        
        # Update tag file with remaining lines
        with open(TAG_FILE, "w") as file:
            file.writelines(remaining_lines)
    
    except FileNotFoundError:
        log_with_server("No backup file found.", hostname, device_ip)
    except Exception as e:
        log_with_server(f"Error posting backup data: {e}", hostname, device_ip)