import subprocess
import re

from const import fullPholusPath, logPath
from helper import checkIPV4, timeNow, updateState
from logger import mylog

#-------------------------------------------------------------------------------

def performPholusScan (db, timeoutSec, userSubnets):
    sql = db.sql # TO-DO
    # scan every interface
    for subnet in userSubnets:

        temp = subnet.split("--interface=")

        if len(temp) != 2:
            mylog('none', ["[PholusScan] Skip scan (need subnet in format '192.168.1.0/24 --inteface=eth0'), got: ", subnet])
            return

        mask = temp[0].strip()
        interface = temp[1].strip()

        # logging & updating app state        
        updateState(db,"Scan: Pholus")        
        mylog('none', ['[PholusScan] Scan: Pholus for ', str(timeoutSec), 's ('+ str(round(int(timeoutSec) / 60, 1)) +'min)'])  
        mylog('verbose', ["[PholusScan] Pholus scan on [interface] ", interface, " [mask] " , mask])
        
        # the scan always lasts 2x as long, so the desired user time from settings needs to be halved
        adjustedTimeout = str(round(int(timeoutSec) / 2, 0)) 

        #  python3 -m trace --trace /home/pi/pialert/pholus/pholus3.py eth1 -rdns_scanning  192.168.1.0/24 -stimeout 600
        pholus_args = ['python3', fullPholusPath, interface, "-rdns_scanning", mask, "-stimeout", adjustedTimeout]

        # Execute command
        output = ""

        try:
            # try runnning a subprocess with a forced (timeout + 30 seconds)  in case the subprocess hangs
            output = subprocess.check_output (pholus_args, universal_newlines=True,  stderr=subprocess.STDOUT, timeout=(timeoutSec + 30))
        except subprocess.CalledProcessError as e:
            # An error occured, handle it
            mylog('none', [[PholusScan], e.output])
            mylog('none', ["[PholusScan] Error - Pholus Scan - check logs"])            
        except subprocess.TimeoutExpired as timeErr:
            mylog('none', ['[PholusScan] Pholus TIMEOUT - the process forcefully terminated as timeout reached']) 

        if output == "": # check if the subprocess failed                    
            mylog('none', ['[PholusScan] Scan: Pholus FAIL - check logs']) 
        else: 
            mylog('verbose', ['[PholusScan] Scan: Pholus SUCCESS'])
        
        #  check the last run output
        f = open(logPath + '/pialert_pholus_lastrun.log', 'r+')
        newLines = f.read().split('\n')
        f.close()        

        # cleanup - select only lines containing a separator to filter out unnecessary data
        newLines = list(filter(lambda x: '|' in x, newLines))        
        
        # build SQL query parameters to insert into the DB
        params = []

        for line in newLines:
            columns = line.split("|")
            if len(columns) == 4:
                params.append(( interface + " " + mask, timeNow() , columns[0].replace(" ", ""), columns[1].replace(" ", ""), columns[2].replace(" ", ""), columns[3], ''))

        if len(params) > 0:                
            sql.executemany ("""INSERT INTO Pholus_Scan ("Info", "Time", "MAC", "IP_v4_or_v6", "Record_Type", "Value", "Extra") VALUES (?, ?, ?, ?, ?, ?, ?)""", params) 
            db.commitDB()

#-------------------------------------------------------------------------------
def cleanResult(str):
    # alternative str.split('.')[0]
    str = str.replace("._airplay", "")
    str = str.replace("._tcp", "")
    str = str.replace(".local", "")
    str = str.replace("._esphomelib", "")
    str = str.replace("._googlecast", "")
    str = str.replace(".lan", "")
    str = str.replace(".home", "")
    str = re.sub(r'-[a-fA-F0-9]{32}', '', str)    # removing last part of e.g. Nest-Audio-ff77ff77ff77ff77ff77ff77ff77ff77
    # remove trailing dots
    if str.endswith('.'):
        str = str[:-1]

    return str


# Disclaimer - I'm interfacing with a script I didn't write (pholus3.py) so it's possible I'm missing types of answers
# it's also possible the pholus3.py script can be adjusted to provide a better output to interface with it
# Hit me with a PR if you know how! :)
def resolve_device_name_pholus (pMAC, pIP, allRes):
    
    pholusMatchesIndexes = []

    index = 0
    for result in allRes:
        #  limiting entries used for name resolution to the ones containing the current IP (v4 only)
        if result["MAC"] == pMAC and result["Record_Type"] == "Answer" and result["IP_v4_or_v6"] == pIP and '._googlezone' not in result["Value"]:
            # found entries with a matching MAC address, let's collect indexes             
            pholusMatchesIndexes.append(index)

        index += 1

    # return if nothing found
    if len(pholusMatchesIndexes) == 0:
        return -1

    # we have some entries let's try to select the most useful one

    # airplay matches contain a lot of information
    # Matches for example: 
    # Brand Tv (50)._airplay._tcp.local. TXT Class:32769 "acl=0 deviceid=66:66:66:66:66:66 features=0x77777,0x38BCB46 rsf=0x3 fv=p20.T-FFFFFF-03.1 flags=0x204 model=XXXX manufacturer=Brand serialNumber=XXXXXXXXXXX protovers=1.1 srcvers=777.77.77 pi=FF:FF:FF:FF:FF:FF psi=00000000-0000-0000-0000-FFFFFFFFFF gid=00000000-0000-0000-0000-FFFFFFFFFF gcgl=0 pk=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
    for i in pholusMatchesIndexes:
        if checkIPV4(allRes[i]['IP_v4_or_v6']) and '._airplay._tcp.local. TXT Class:32769' in str(allRes[i]["Value"]) :
            return allRes[i]["Value"].split('._airplay._tcp.local. TXT Class:32769')[0]
    
    # second best - contains airplay
    # Matches for example: 
    # _airplay._tcp.local. PTR Class:IN "Brand Tv (50)._airplay._tcp.local."
    for i in pholusMatchesIndexes:
        if checkIPV4(allRes[i]['IP_v4_or_v6']) and '_airplay._tcp.local. PTR Class:IN' in allRes[i]["Value"] and ('._googlecast') not in allRes[i]["Value"]:
            return cleanResult(allRes[i]["Value"].split('"')[1])    

    # Contains PTR Class:32769
    # Matches for example: 
    # 3.1.168.192.in-addr.arpa. PTR Class:32769 "MyPc.local."
    for i in pholusMatchesIndexes:
        if checkIPV4(allRes[i]['IP_v4_or_v6']) and 'PTR Class:32769' in allRes[i]["Value"]:
            return cleanResult(allRes[i]["Value"].split('"')[1])

    # Contains AAAA Class:IN
    # Matches for example: 
    # DESKTOP-SOMEID.local. AAAA Class:IN "fe80::fe80:fe80:fe80:fe80"
    for i in pholusMatchesIndexes:
        if checkIPV4(allRes[i]['IP_v4_or_v6']) and 'AAAA Class:IN' in allRes[i]["Value"]:
            return cleanResult(allRes[i]["Value"].split('.local.')[0])

    # Contains _googlecast._tcp.local. PTR Class:IN
    # Matches for example: 
    # _googlecast._tcp.local. PTR Class:IN "Nest-Audio-ff77ff77ff77ff77ff77ff77ff77ff77._googlecast._tcp.local."
    for i in pholusMatchesIndexes:
        if checkIPV4(allRes[i]['IP_v4_or_v6']) and '_googlecast._tcp.local. PTR Class:IN' in allRes[i]["Value"] and ('Google-Cast-Group') not in allRes[i]["Value"]:
            return cleanResult(allRes[i]["Value"].split('"')[1])

    # Contains A Class:32769
    # Matches for example: 
    # Android.local. A Class:32769 "192.168.1.6"
    for i in pholusMatchesIndexes:
        if checkIPV4(allRes[i]['IP_v4_or_v6']) and ' A Class:32769' in allRes[i]["Value"]:
            return cleanResult(allRes[i]["Value"].split(' A Class:32769')[0])

    # # Contains PTR Class:IN
    # Matches for example: 
    # _esphomelib._tcp.local. PTR Class:IN "ceiling-light-1._esphomelib._tcp.local."
    for i in pholusMatchesIndexes:
        if checkIPV4(allRes[i]['IP_v4_or_v6']) and 'PTR Class:IN' in allRes[i]["Value"]:
            return cleanResult(allRes[i]["Value"].split('"')[1])

    return -1
    
#-------------------------------------------------------------------------------

def resolve_device_name_dig (pMAC, pIP):
    
    newName = ""

    try :
        dig_args = ['dig', '+short', '-x', pIP]

        # Execute command
        try:
            # try runnning a subprocess
            newName = subprocess.check_output (dig_args, universal_newlines=True)
        except subprocess.CalledProcessError as e:
            # An error occured, handle it
            mylog('none', ['[device_name_dig] ', e.output])            
            # newName = "Error - check logs"
            return -1

        # Check returns
        newName = newName.strip()

        if len(newName) == 0 :
            return -1
            
        # Cleanup
        newName = cleanResult(newName)

        if newName == "" or  len(newName) == 0: 
            return -1

        # Return newName
        return newName

    # not Found
    except subprocess.CalledProcessError :
        return -1