#!/usr/bin/env python
#
#-------------------------------------------------------------------------------
#  NetAlertX  v2.70  /  2021-02-01
#  Open Source Network Guard / WIFI & LAN intrusion detector 
#
#  Back module. Network scanner
#-------------------------------------------------------------------------------
#  Puche 2021 / 2022+ jokob             jokob@duck.com                GNU GPLv3
#-------------------------------------------------------------------------------


#===============================================================================
# IMPORTS
#===============================================================================
#from __future__ import print_function

import sys
import time
import datetime
import multiprocessing
import subprocess

# Register NetAlertX modules 
import conf
from const import *
from logger import  mylog
from helper import  filePermissions, timeNowTZ, get_setting_value
from app_state import updateState
from api import update_api
from scan.session_events import process_scan
from initialise import importConfigs
from database import DB
from reporting import get_notifications
from notification import Notification_obj
from plugin import run_plugin_scripts, check_and_run_user_event 
from scan.device_handling import update_devices_names
from workflows.manager import WorkflowManager 

#===============================================================================
#===============================================================================
#                              MAIN
#===============================================================================
#===============================================================================
"""
main structure of Pi Alert

    Initialise All
    start Loop forever
        initialise loop 
            (re)import config
            (re)import plugin config
        run plugins (once)
        run frontend events
        update API         
        run plugins (scheduled)
        processing scan results
        run plugins (after Scan)
        reporting - could be replaced by run flows TODO
    end loop
"""

def main ():
    mylog('none', ['[MAIN] Setting up ...']) # has to be level 'none' as user config not loaded yet

    mylog('none', [f'[conf.tz] Setting up ...{conf.tz}'])
    
    # check file permissions and fix if required
    filePermissions()

    # Header + init app state
    updateState("Initializing", None, None, None, 0)    

    # Open DB once and keep open
    # Opening / closing DB frequently actually casues more issues
    db = DB()  # instance of class DB
    db.open()
    sql = db.sql  # To-Do replace with the db class

    # Upgrade DB if needed
    db.upgradeDB()

    # Initialize the WorkflowManager
    workflow_manager = WorkflowManager(db)

    #===============================================================================
    # This is the main loop of NetAlertX 
    #===============================================================================

    mylog('debug', '[MAIN] Starting loop')

    all_plugins = None

    while True:

        # re-load user configuration and plugins   
        all_plugins, imported = importConfigs(db, all_plugins)

        # update time started
        conf.loop_start_time = timeNowTZ()       
        
        loop_start_time = conf.loop_start_time # TODO fix                      

        # Handle plugins executed ONCE
        if conf.plugins_once_run == False:
            run_plugin_scripts(db, all_plugins, 'once')  
            conf.plugins_once_run = True
        
        # check if user is waiting for api_update
        check_and_run_user_event(db, all_plugins)

        # Update API endpoints              
        update_api(db, all_plugins, False)

        # proceed if 1 minute passed
        if conf.last_scan_run + datetime.timedelta(minutes=1) < conf.loop_start_time :

             # last time any scan or maintenance/upkeep was run
            conf.last_scan_run = loop_start_time            

            # Header
            updateState("Process: Start")      

            # Timestamp
            startTime = loop_start_time
            startTime = startTime.replace (microsecond=0) 

            # Check if any plugins need to run on schedule
            run_plugin_scripts(db, all_plugins, 'schedule') 

            # determine run/scan type based on passed time
            # --------------------------------------------
           
            # Runs plugin scripts which are set to run every time after a scans finished            
            run_plugin_scripts(db, all_plugins, 'always_after_scan')             
            
            # process all the scanned data into new devices
            processScan = updateState("Check scan").processScan
            mylog('debug', [f'[MAIN] processScan: {processScan}'])
            
            if processScan == True:   
                mylog('debug', "[MAIN] start processig scan results")
                process_scan(db)
                updateState("Scan processed", None, None, None, None, False)
                          
            # --------
            # Reporting   
            # run plugins before notification processing (e.g. Plugins to discover device names)
            run_plugin_scripts(db, all_plugins, 'before_name_updates')

            # Resolve devices names
            mylog('debug','[Main] Resolve devices names')
            update_devices_names(db)             
            
            # Check if new devices found
            sql.execute (sql_new_devices)
            newDevices = sql.fetchall()
            db.commitDB()
            
            #  new devices were found
            if len(newDevices) > 0:
                #  run all plugins registered to be run when new devices are found                    
                run_plugin_scripts(db, all_plugins, 'on_new_device')

            # Notification handling
            # ----------------------------------------

            # send all configured notifications
            final_json = get_notifications(db)

            # Write the notifications into the DB
            notification    = Notification_obj(db)
            notificationObj = notification.create(final_json, "")

            # run all enabled publisher gateways 
            if notificationObj.HasNotifications:                
                
                run_plugin_scripts(db, all_plugins, 'on_notification') 
                notification.setAllProcessed()
                notification.clearPendingEmailFlag()
                
            else:
                mylog('verbose', ['[Notification] No changes to report'])

            # Commit SQL
            db.commitDB()        
                        
            mylog('verbose', ['[MAIN] Process: Idle'])            
        else:
            # do something  
            # mylog('verbose', ['[MAIN] Waiting to start next loop'])
            updateState("Process: Idle")

        # WORKFLOWS handling 
        # ----------------------------------------
        # Fetch new unprocessed events
        new_events = workflow_manager.get_new_app_events()

        mylog('debug', [f'[MAIN] Processing WORKFLOW new_events from get_new_app_events: {len(new_events)}'])

        # Process each new event and check triggers
        if len(new_events) > 0:
            updateState("Workflows: Start")
            update_api_flag = False
            for event in new_events:
                mylog('debug', [f'[MAIN] Processing WORKFLOW app event with GUID {event["GUID"]}'])

                # proceed to process events
                workflow_manager.process_event(event)  

                if workflow_manager.update_api:
                    # Update API endpoints if needed  
                    update_api_flag = True   

            if update_api_flag:     
                update_api(db, all_plugins, True)

            updateState("Workflows: End")
           

        #loop     
        time.sleep(5) # wait for N seconds      



#===============================================================================
# BEGIN
#===============================================================================
if __name__ == '__main__':
    mylog('debug', ['[__main__] Welcome to NetAlertX'])
    sys.exit(main())       
