import subprocess
import datetime
from zoneinfo import ZoneInfo
import sys
import os    
import shutil

import ogGlobals
#from engine.DiskLib import *
#from engine.CacheLib import *
#from engine.StringLib import *
from StringLib import *

#NODEBUGFUNCTIONS, OGIMG, OG_ERR_CACHESIZE, OG_ERR_NOTCACHE, OG_ERR_NOTWRITE, OG_ERR_FILESYS
#OG_ERR_REPO, OG_ERR_NOTOS, OG_ERR_NOGPT, OG_ERR_OUTOFLIMIT, OG_ERR_IMAGE, OG_ERR_CACHE
#OGLOGSESSION, OGLOGCOMMAND, OGLOGFILE, OG_ERR_LOCKED, OG_ERR_PARTITION, OG_ERR_FORMAT, OG_ERR_NOTEXEC, OG_ERR_NOTFOUND

def _logtype2logfile (t):
    if   'log'     == t: return ogGlobals.OGLOGFILE
    elif 'command' == t: return ogGlobals.OGLOGCOMMAND
    elif 'session' == t: return ogGlobals.OGLOGSESSION
    else: raise Exception (f'unknown log type ({t})')
#/**
#         ogEcho [str_logtype ...] [str_loglevel] "str_message" ...
#@brief   Muestra mensajes en consola y lo registra en fichero de incidencias.
#@param   str_logtype  tipo de registro de incidencias ("log", "command", "session")
#@param   str_loglevel nivel de registro de incidencias ("info", "warning", "error")
#@param   str_message  mensaje (puede recibir más de 1 parámetro.
#@return  Mensaje mostrado.
#*/
## zero or more logtypes can be specified
## zero or one loglevel can be specified
## ogEcho ([],                 None,   msg)
## ogEcho ('log',              None,   msg)
## ogEcho ('session',          None,   msg)
## ogEcho (['log', 'session'], None,   msg)
## ogEcho ([], None,           'info', msg)
## ogEcho ('log', None,        'info', msg)
## ogEcho ('session', None,    'info', msg)
## ogEcho (['log', 'session'], 'info', msg)
def ogEcho (logtypes, loglevel, msg):
    logfiles = []
    if type (logtypes) is list:
        for l in logtypes:
            logfiles.append (_logtype2logfile (l))
    else:   ## string
        logfiles.append (_logtype2logfile (logtypes))

    if loglevel is None or 'help' == loglevel:
        if ogGlobals.DEBUG.lower() != "no":
            logfiles.append (ogGlobals.OGLOGFILE)
        for f in logfiles:
            with open (f, 'a') as fd:
                fd.write (msg + '\n')
        return

    if 'info' == loglevel or 'warning' == loglevel or 'error' == loglevel:
        DATETIME = datetime.datetime.now(ZoneInfo(ogGlobals.TZ)).strftime("%F %T %Z")

        for f in logfiles:
            with open (f, 'a') as fd:
                fd.write (f"OpenGnsys {loglevel} {DATETIME} {msg}\n")
    else:
        raise Exception (f'unknown loglevel ({loglevel})')

def ogExecAndLog(*args):
    # Variables locales
    ISCOMMAND = False
    ISLOG = False
    ISSESSION = False
    COMMAND = ""
    CONTINUE = 1
    FILES = ""
    REDIREC = ""
    FUNCNAME = ogExecAndLog.__name__

    # Si se solicita, mostrar ayuda.
    if len(args) > 0 and args[0] == "help":
        ogHelp(f"{FUNCNAME} str_logfile ... str_command ...",
                f"{FUNCNAME} COMMAND ls -al /")
        return

    # Procesar parámetros.
    while CONTINUE:
        arg = args.pop(0).lower()
        if arg == "command":
            ISCOMMAND = True
            continue
        elif arg == "log":
            ISLOG = True
            continue
        elif arg == "session":
            ISSESSION = True
            continue
        else:
            COMMAND = " ".join(args)
            CONTINUE = 0

    # Error si no se recibe un comando que ejecutar.
    if not COMMAND:
        ogRaiseError(OG_ERR_FORMAT)
        return

    # Componer lista de ficheros de registro.
    if ISCOMMAND:
        FILES = OGLOGCOMMAND
        open(FILES, "w").close()
        REDIREC = "2>&1"
    if ISLOG:
        FILES += " " + OGLOGFILE
    if ISSESSION:
        FILES += " " + OGLOGSESSION

    # Ejecutar comando.
    subprocess.call(f"{COMMAND} {REDIREC} | tee -a {FILES}", shell=True)
    # Salida de error del comando ejecutado.
    return subprocess.PIPESTATUS[0]

#/**
#         ogGetCaller
#@brief   Devuelve nombre del programa o script ejecutor (padre).
#@return  str_name - Nombre del programa ejecutor.
#*/
def ogGetCaller():
    if 'COLUMNS' in os.environ:
        cols = os.environ['COLUMNS']
    else:
        cols = None

    lines = subprocess.run (["ps", "hp", str(os.getppid()), "-o", "args"], capture_output=True, text=True).stdout.splitlines()
    if 0 == len (lines):
        return ''

    line = lines[0]
    words = line.split()
    if "bash" in line and len(words)>1:
        caller = words[1]
    else:
        caller = words[0].lstrip("-")

    if cols is None:
        del (os.environ['COLUMNS'])
    else:
        os.environ['COLUMNS'] = cols

    return os.path.basename(caller)

import inspect
#/**
#         ogHelp ["str_function" ["str_format" ["str_example" ... ]]]
#@brief   Muestra mensaje de ayuda para una función determinda.
#@param   str_function Nombre de la función.
#@param   str_format   Formato de ejecución de la función.
#@param   str_example  Ejemplo de ejecución de la función.
#@return  str_help - Salida de ayuda.
#@note    Si no se indican parámetros, la función se toma de la variable \c $FUNCNAME
#@note    La descripción de la función se toma de la variable compuesta por \c MSG_FUNC_$función incluida en el fichero de idiomas.
#@note    Pueden especificarse varios mensajes con ejemplos.
#*/
def ogHelp (fname, fmt=None, examples=[]):
    FUNC = fname or inspect.stack()[1][3]
    MSG = f'ogGlobals.lang.MSG_HELP_{FUNC}'
    ogEcho ([], "help", f"{ogGlobals.lang.MSG_FUNCTION} {FUNC}: {eval (MSG)}")
    if fmt:
        ogEcho([], "help", f"    {ogGlobals.lang.MSG_FORMAT}: {fmt}")

    if type (examples) is list:
        for example in examples:
            ogEcho([], "help", f"    {ogGlobals.lang.MSG_EXAMPLE}: {example}")
    else:   ## string
        ogEcho([], "help", f"    {ogGlobals.lang.MSG_EXAMPLE}: {examples}")

#/**
#         ogRaiseError [str_logtype ...] int_errcode ["str_errmessage" ...]
#@brief   Devuelve el mensaje y el código de error correspondiente.
#@param   str_logtype    tipo de registro de incidencias.
#@param   int_errcode    código de error.
#@param   str_errmessage mensajes complementarios de error.
#@return  str_code - código de error
#*/
## si creamos un script ogRaiseError que llame a esta función (lo cual está por ver)
## entonces la gestión de la ayuda va en ese script, por ejemplo:
#from SystemLib import ogHelp
#if 'help' == sys.argv[1]:
#    ogHelp (
#        'ogRaiseError',
#        'ogRaiseError ([str_logfile, ...], int_errorcode, str_errormessage)',
#        [
#            'ogRaiseError ("log", 42, "my error message")',
#            'ogRaiseError (["log", "session"], 43, "my other error message")',
#        ]
#    )
#    return

def ogRaiseError (logtypes, code, msg):
    if   code == ogGlobals.OG_ERR_FORMAT:                 MSG = f'{ogGlobals.lang.MSG_ERR_FORMAT} "{msg}"'
    elif code == ogGlobals.OG_ERR_NOTFOUND:               MSG = f'{ogGlobals.lang.MSG_ERR_NOTFOUND} "{msg}"'
    elif code == ogGlobals.OG_ERR_OUTOFLIMIT:             MSG = f'{ogGlobals.lang.MSG_ERR_OUTOFLIMIT} "{msg}"'
    elif code == ogGlobals.OG_ERR_PARTITION:              MSG = f'{ogGlobals.lang.MSG_ERR_PARTITION} "{msg}"'
    elif code == ogGlobals.OG_ERR_LOCKED:                 MSG = f'{ogGlobals.lang.MSG_ERR_LOCKED} "{msg}"'
    elif code == ogGlobals.OG_ERR_CACHE:                  MSG = f'{ogGlobals.lang.MSG_ERR_CACHE} "{msg}"'
    elif code == ogGlobals.OG_ERR_NOGPT:                  MSG = f'{ogGlobals.lang.MSG_ERR_NOGPT} "{msg}"'
    elif code == ogGlobals.OG_ERR_REPO:                   MSG = f'{ogGlobals.lang.MSG_ERR_REPO} "{msg}"'
    elif code == ogGlobals.OG_ERR_FILESYS:                MSG = f'{ogGlobals.lang.MSG_ERR_FILESYS} "{msg}"'
    elif code == ogGlobals.OG_ERR_IMAGE:                  MSG = f'{ogGlobals.lang.MSG_ERR_IMAGE} "{msg}"'
    elif code == ogGlobals.OG_ERR_NOTOS:                  MSG = f'{ogGlobals.lang.MSG_ERR_NOTOS} "{msg}"'
    elif code == ogGlobals.OG_ERR_NOTEXEC:                MSG = f'{ogGlobals.lang.MSG_ERR_NOTEXEC} "{msg}"'
    elif code == ogGlobals.OG_ERR_NOTWRITE:               MSG = f'{ogGlobals.lang.MSG_ERR_NOTWRITE} "{msg}"'
    elif code == ogGlobals.OG_ERR_NOTCACHE:               MSG = f'{ogGlobals.lang.MSG_ERR_NOTCACHE} "{msg}"'
    elif code == ogGlobals.OG_ERR_CACHESIZE:              MSG = f'{ogGlobals.lang.MSG_ERR_CACHESIZE} "{msg}"'
    elif code == ogGlobals.OG_ERR_REDUCEFS:               MSG = f'{ogGlobals.lang.MSG_ERR_REDUCEFS} "{msg}"'
    elif code == ogGlobals.OG_ERR_EXTENDFS:               MSG = f'{ogGlobals.lang.MSG_ERR_EXTENDFS} "{msg}"'
    elif code == ogGlobals.OG_ERR_IMGSIZEPARTITION:       MSG = f'{ogGlobals.lang.MSG_ERR_IMGSIZEPARTITION} "{msg}"'
    elif code == ogGlobals.OG_ERR_UPDATECACHE:            MSG = f'{ogGlobals.lang.MSG_ERR_UPDATECACHE} "{msg}"'
    elif code == ogGlobals.OG_ERR_DONTFORMAT:             MSG = f'{ogGlobals.lang.MSG_ERR_DONTFORMAT} "{msg}"'
    elif code == ogGlobals.OG_ERR_IMAGEFILE:              MSG = f'{ogGlobals.lang.MSG_ERR_IMAGEFILE} "{msg}"'
    elif code == ogGlobals.OG_ERR_UCASTSYNTAXT:           MSG = f'{ogGlobals.lang.MSG_ERR_UCASTSYNTAXT} "{msg}"'
    elif code == ogGlobals.OG_ERR_UCASTSENDPARTITION:     MSG = f'{ogGlobals.lang.MSG_ERR_UCASTSENDPARTITION} "{msg}"'
    elif code == ogGlobals.OG_ERR_UCASTSENDFILE:          MSG = f'{ogGlobals.lang.MSG_ERR_UCASTSENDFILE} "{msg}"'
    elif code == ogGlobals.OG_ERR_UCASTRECEIVERPARTITION: MSG = f'{ogGlobals.lang.MSG_ERR_UCASTRECEIVERPARTITION} "{msg}"'
    elif code == ogGlobals.OG_ERR_UCASTRECEIVERFILE:      MSG = f'{ogGlobals.lang.MSG_ERR_UCASTRECEIVERFILE} "{msg}"'
    elif code == ogGlobals.OG_ERR_MCASTSYNTAXT:           MSG = f'{ogGlobals.lang.MSG_ERR_MCASTSYNTAXT} "{msg}"'
    elif code == ogGlobals.OG_ERR_MCASTSENDFILE:          MSG = f'{ogGlobals.lang.MSG_ERR_MCASTSENDFILE} "{msg}"'
    elif code == ogGlobals.OG_ERR_MCASTRECEIVERFILE:      MSG = f'{ogGlobals.lang.MSG_ERR_MCASTRECEIVERFILE} "{msg}"'
    elif code == ogGlobals.OG_ERR_MCASTSENDPARTITION:     MSG = f'{ogGlobals.lang.MSG_ERR_MCASTSENDPARTITION} "{msg}"'
    elif code == ogGlobals.OG_ERR_MCASTRECEIVERPARTITION: MSG = f'{ogGlobals.lang.MSG_ERR_MCASTRECEIVERPARTITION} "{msg}"'
    elif code == ogGlobals.OG_ERR_PROTOCOLJOINMASTER:     MSG = f'{ogGlobals.lang.MSG_ERR_PROTOCOLJOINMASTER} "{msg}"'
    elif code == ogGlobals.OG_ERR_DONTMOUNT_IMAGE:        MSG = f'{ogGlobals.lang.MSG_ERR_DONTMOUNT_IMAGE} "{msg}"'
    elif code == ogGlobals.OG_ERR_DONTUNMOUNT_IMAGE:      MSG = f'{ogGlobals.lang.MSG_ERR_DONTUNMOUNT_IMAGE} "{msg}"'
    elif code == ogGlobals.OG_ERR_DONTSYNC_IMAGE:         MSG = f'{ogGlobals.lang.MSG_ERR_DONTSYNC_IMAGE} "{msg}"'
    elif code == ogGlobals.OG_ERR_NOTDIFFERENT:           MSG = f'{ogGlobals.lang.MSG_ERR_NOTDIFFERENT} "{msg}"'
    elif code == ogGlobals.OG_ERR_SYNCHRONIZING:          MSG = f'{ogGlobals.lang.MSG_ERR_SYNCHRONIZING} "{msg}"'
    elif code == ogGlobals.OG_ERR_NOTUEFI:                MSG = f'{ogGlobals.lang.MSG_ERR_NOTUEFI} "{msg}"'
    elif code == ogGlobals.OG_ERR_NOMSDOS:                MSG = f'{ogGlobals.lang.MSG_ERR_NOMSDOS} "{msg}"'
    elif code == ogGlobals.OG_ERR_NOTBIOS:                MSG = f'{ogGlobals.lang.MSG_ERR_NOTBIOS} "{msg}"'
    else:
        MSG = ogGlobals.lang.MSG_ERR_GENERIC
        CODE = ogGlobals.OG_ERR_GENERIC

    call_stack = [i[3] for i in inspect.stack()]
    if len (call_stack) < 3: return     ## shouldn't happen
    call_stack.pop()    ## remove '<module>'
    call_stack.pop(0)   ## remove 'ogRaiseError'
    str_call_stack = ' '.join (call_stack)

    if code == ogGlobals.OG_ERR_FORMAT or \
        ogCheckStringInGroup (str_call_stack, ogGlobals.NODEBUGFUNCTIONS) or \
        not ogCheckStringInGroup (call_stack[0], ogGlobals.NODEBUGFUNCTIONS):
        ogEcho (logtypes, "error", f"{str_call_stack.replace(' ', '<-')}: {MSG}")

    return code

def ogIsRepoLocked():
    # Variables locales
    FILES = ""
    FUNCNAME = ogIsRepoLocked.__name__

    # Si se solicita, mostrar ayuda.
    if len(sys.argv) > 1 and sys.argv[1] == "help":
        ogHelp(f"{FUNCNAME}", f"{FUNCNAME}", f"if {FUNCNAME}(): ...")

    # No hacer nada, si no está definido el punto de montaje del repositorio.
    if not OGIMG:
        return 1

    # Comprobar si alguno de los ficheros abiertos por los procesos activos está en el
    # punto de montaje del repositorio de imágenes.
    FILES = subprocess.check_output(["find", "/proc", "-maxdepth", "2", "-type", "f", "-lname", f"{OGIMG}/*"]).decode("utf-8")
    return bool(FILES)

def ogCheckProgram(*args):
    FUNCNAME = ogCheckProgram.__name__
    # Si se solicita, mostrar ayuda.
    if len(args) > 0 and args[0] == "help":
        ogHelp(f"{FUNCNAME} \"str_program ...\"",
                f"{FUNCNAME} \"partimage partclone mbuffer\"")
        return

    # Error si no se recibe 1 parámetro.
    if len(args) != 1:
        ogRaiseError(OG_ERR_FORMAT)
        return

    PERROR = 0
    PLOG = " "
    for i in args[0].split():
        if not shutil.which(i):
            PERROR = 1
            PLOG += f" {i}"
    
    if PERROR == 1:
        ogRaiseError(OG_ERR_NOTEXEC, PLOG)
        return
    else:
        return 0
    
def ogIsVirtualMachine():
    output = subprocess.run (["dmidecode", "-s", "system-product-name"], capture_output=True, text=True).stdout
    return "KVM" in output or "VirtualBox" in output