import datetime
import os
import sys
import _io
import json
import uuid
import socket
import subprocess
import requests
from yattag import indent
from json2table import convert

# Register NetAlertX directories
INSTALL_PATH="/app"
sys.path.extend([f"{INSTALL_PATH}/server"])

# Register NetAlertX modules 

import conf
from const import applicationPath, logPath, apiPath, confFileName, reportTemplatesPath
from logger import logResult, mylog
from helper import generate_mac_links, removeDuplicateNewLines, timeNowTZ, get_file_content, write_file, get_setting_value, get_timezone_offset

NOTIFICATION_API_FILE = apiPath + 'user_notifications.json'

# Show Frontend User Notification
def write_notification(content, level='alert', timestamp=None):   

    if timestamp is None:
        timestamp = timeNowTZ()     

    # Generate GUID
    guid = str(uuid.uuid4())

    # Prepare notification dictionary
    notification = {
        'timestamp': str(timestamp),
        'guid': guid,
        'read': 0,
        'level': level,
        'content': content
    }

    # If file exists, load existing data, otherwise initialize as empty list
    if os.path.exists(NOTIFICATION_API_FILE):
        with open(NOTIFICATION_API_FILE, 'r') as file:
            # Check if the file object is of type _io.TextIOWrapper
            if isinstance(file, _io.TextIOWrapper):
                file_contents = file.read()  # Read file contents
                if file_contents == '':
                    file_contents = '[]'  # If file is empty, initialize as empty list

                # mylog('debug', ['[Notification] User Notifications file: ', file_contents])
                notifications = json.loads(file_contents)  # Parse JSON data
            else:
                mylog('none', '[Notification] File is not of type _io.TextIOWrapper')
                notifications = []
    else:
        notifications = []

    # Append new notification
    notifications.append(notification)

    # Write updated data back to file
    with open(NOTIFICATION_API_FILE, 'w') as file:
        json.dump(notifications, file, indent=4)

# Trim notifications
def remove_old(keepNumberOfEntries):

    # Check if file exists
    if not os.path.exists(NOTIFICATION_API_FILE):
        mylog('info', '[Notification] No notifications file to clean.')
        return

    # Load existing notifications
    try:
        with open(NOTIFICATION_API_FILE, 'r') as file:
            file_contents = file.read().strip()
            if file_contents == '':
                notifications = []
            else:
                notifications = json.loads(file_contents)
    except Exception as e:
        mylog('none', f'[Notification] Error reading notifications file: {e}')
        return

    if not isinstance(notifications, list):
        mylog('none', '[Notification] Invalid format: not a list')
        return

    # Sort by timestamp descending
    try:
        notifications.sort(key=lambda x: x['timestamp'], reverse=True)
    except KeyError:
        mylog('none', '[Notification] Missing timestamp in one or more entries')
        return

    # Trim to the latest entries
    trimmed = notifications[:keepNumberOfEntries]

    # Write back the trimmed list
    try:
        with open(NOTIFICATION_API_FILE, 'w') as file:
            json.dump(trimmed, file, indent=4)
        mylog('verbose', f'[Notification] Trimmed notifications to latest {keepNumberOfEntries}')
    except Exception as e:
        mylog('none', f'Error writing trimmed notifications file: {e}')