#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
    Copyright(c) 2008-2013 pyLoad Team
    http://www.pyload.org

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as
    published by the Free Software Foundation, either version 3 of the
    License, or (at your option) any later version.

    Subjected to the terms and conditions in LICENSE

    @author: spoob
    @author: sebnapi
    @author: RaNaN
    @author: mkaay
    @version: v0.4.9
"""
CURRENT_VERSION = '0.4.9.9-dev'

import __builtin__

from getopt import getopt, GetoptError
from imp import find_module
import logging
import logging.handlers
import os
from os import _exit, execl, getcwd, remove, walk, chdir, close
import signal
import sys
from sys import argv, executable, exit
from time import time, sleep
from traceback import print_exc

import locale
locale.locale_alias = locale.windows_locale = {} #save ~100kb ram, no known sideeffects for now

import subprocess
subprocess.__doc__ = None # the module with the largest doc we are using

from module import InitHomeDir
from module.AccountManager import AccountManager
from module.config.ConfigParser import ConfigParser
from module.config.ConfigManager import ConfigManager
from module.PluginManager import PluginManager
from module.interaction.EventManager import EventManager
from module.network.RequestFactory import RequestFactory
from module.web.ServerThread import WebServer
from module.Scheduler import Scheduler
from module.common.JsEngine import JsEngine
from module.remote.RemoteManager import RemoteManager

import module.common.pylgettext as gettext
from module.utils import formatSize, get_console_encoding
from module.utils.fs import free_space, exists, makedirs, join, chmod

from codecs import getwriter

# test runner overwrites sys.stdout
if hasattr(sys.stdout, "encoding"): enc = get_console_encoding(sys.stdout.encoding)
else: enc = "utf8"

sys._stdout = sys.stdout
sys.stdout = getwriter(enc)(sys.stdout, errors="replace")

# TODO List
# - configurable auth system ldap/mysql
# - cron job like sheduler
# - plugin stack / multi decrypter
# - media plugin type
# - general progress info
# - content attribute for files / sync status
# - sync with disk content / file manager / nested packages
# - sync between pyload cores
# - new attributes (date|sync status)
# - embedded packages
# - would require new/modified link collector concept
# - pausable links/packages
# - toggable accounts
# - interaction manager
# - improve external scripts
# - make pyload undestructable to fail plugins -> see ConfigParser first

class Core(object):
    """pyLoad Core, one tool to rule them all... (the filehosters) :D"""

    def __init__(self):
        self.doDebug = False
        self.running = False
        self.daemon = False
        self.remote = True
        self.pdb = None
        self.arg_links = []
        self.pidfile = "pyload.pid"
        self.deleteLinks = False # will delete links on startup

        if len(argv) > 1:
            try:
                options, args = getopt(argv[1:], 'vchdusqp:',
                    ["version", "clear", "clean", "help", "debug", "user",
                     "setup", "configdir=", "changedir", "daemon",
                     "quit", "status", "no-remote","pidfile="])

                for option, argument in options:
                    if option in ("-v", "--version"):
                        print "pyLoad", CURRENT_VERSION
                        exit()
                    elif option in ("-p", "--pidfile"):
                        self.pidfile = argument
                    elif option == "--daemon":
                        self.daemon = True
                    elif option in ("-c", "--clear"):
                        self.deleteLinks = True
                    elif option in ("-h", "--help"):
                        self.print_help()
                        exit()
                    elif option in ("-d", "--debug"):
                        self.doDebug = True
                    elif option in ("-u", "--user"):
                        from module.Setup import Setup

                        self.config = ConfigParser()
                        s = Setup(pypath, self.config)
                        s.set_user()
                        exit()
                    elif option in ("-s", "--setup"):
                        from module.Setup import Setup

                        self.config = ConfigParser()
                        s = Setup(pypath, self.config)
                        s.start()
                        exit()
                    elif option == "--changedir":
                        from module.Setup import Setup

                        self.config = ConfigParser()
                        s = Setup(pypath, self.config)
                        s.conf_path(True)
                        exit()
                    elif option in ("-q", "--quit"):
                        self.quitInstance()
                        exit()
                    elif option == "--status":
                        pid = self.isAlreadyRunning()
                        if self.isAlreadyRunning():
                            print pid
                            exit(0)
                        else:
                            print "false"
                            exit(1)
                    elif option == "--clean":
                        self.cleanTree()
                        exit()
                    elif option == "--no-remote":
                        self.remote = False

            except GetoptError:
                print 'Unknown Argument(s) "%s"' % " ".join(argv[1:])
                self.print_help()
                exit()

    def print_help(self):
        print ""
        print "pyLoad v%s     2008-2013 the pyLoad Team" % CURRENT_VERSION
        print ""
        if sys.argv[0].endswith(".py"):
            print "Usage: python pyload.py [options]"
        else:
            print "Usage: pyload [options]"
        print ""
        print "<Options>"
        print "  -v, --version", " " * 10, "Print version to terminal"
        print "  -c, --clear", " " * 12, "Delete all saved packages/links"
        #print "  -a, --add=<link/list>", " " * 2, "Add the specified links"
        print "  -u, --user", " " * 13, "Manages users"
        print "  -d, --debug", " " * 12, "Enable debug mode"
        print "  -s, --setup", " " * 12, "Run setup assistant"
        print "  --configdir=<dir>", " " * 6, "Run with <dir> as configuration directory"
        print "  -p, --pidfile=<file>", " " * 3, "Set pidfile to <file>"
        print "  --changedir", " " * 12, "Change configuration directory permanently"
        print "  --daemon", " " * 15, "Daemonize after startup"
        print "  --no-remote", " " * 12, "Disable remote access (saves RAM)"
        print "  --status", " " * 15, "Display pid if running or False"
        print "  --clean", " " * 16, "Remove .pyc/.pyo files"
        print "  -q, --quit", " " * 13, "Quit a running pyLoad instance"
        print "  -h, --help", " " * 13, "Display this help screen"
        print ""


    def quit(self, a, b):
        self.shutdown()
        self.log.info(_("Received Quit signal"))
        _exit(1)

    def writePidFile(self):
        self.deletePidFile()
        pid = os.getpid()
        f = open(self.pidfile, "wb")
        f.write(str(pid))
        f.close()
        chmod(self.pidfile, 0660)

    def deletePidFile(self):
        if self.checkPidFile():
            self.log.debug("Deleting old pidfile %s" % self.pidfile)
            os.remove(self.pidfile)

    def checkPidFile(self):
        """ return pid as int or 0"""
        if os.path.isfile(self.pidfile):
            f = open(self.pidfile, "rb")
            pid = f.read().strip()
            f.close()
            if pid:
                pid = int(pid)
                return pid

        return 0

    def isAlreadyRunning(self):
        pid = self.checkPidFile()
        if not pid or os.name == "nt": return False
        try:
            os.kill(pid, 0)  # 0 - default signal (does nothing)
        except:
            return 0

        return pid

    def quitInstance(self):
        if os.name == "nt":
            print "Not supported on windows."
            return

        pid = self.isAlreadyRunning()
        if not pid:
            print "No pyLoad running."
            return

        try:
            os.kill(pid, 3) #SIGUIT

            t = time()
            print "waiting for pyLoad to quit"

            while exists(self.pidfile) and t + 10 > time():
                sleep(0.25)

            if not exists(self.pidfile):
                print "pyLoad successfully stopped"
            else:
                os.kill(pid, 9) #SIGKILL
                print "pyLoad did not respond"
                print "Kill signal was send to process with id %s" % pid

        except:
            print "Error quitting pyLoad"


    def cleanTree(self):
        for path, dirs, files in walk(self.path("")):
            for f in files:
                if not f.endswith(".pyo") and not f.endswith(".pyc"):
                    continue

                if "_25" in f or "_26" in f or "_27" in f:
                    continue

                print join(path, f)
                remove(join(path, f))

    def start(self, rpc=True, web=True, tests=False):
        """ starts the fun :D """

        self.version = CURRENT_VERSION

        # TODO: Re-enable when its working again
        # TODO: Don't forget it
        if False and not exists("pyload.conf") and not tests:
            from module.Setup import Setup

            print "This is your first start, running configuration assistant now."
            self.config = ConfigParser()
            s = Setup(pypath, self.config)
            res = False
            try:
                res = s.start()
            except SystemExit:
                pass
            except KeyboardInterrupt:
                print "\nSetup interrupted"
            except:
                res = False
                print_exc()
                print "Setup failed"
            if not res:
                remove("pyload.conf")

            exit()

        try: signal.signal(signal.SIGQUIT, self.quit)
        except: pass

        self.config = ConfigParser()

        gettext.setpaths([join(os.sep, "usr", "share", "pyload", "locale"), None])
        translation = gettext.translation("pyLoad", self.path("locale"),
                                          languages=[self.config['general']['language'],"en"],fallback=True)
        translation.install(True)

        # load again so translations are propagated
        self.config.loadDefault()

        self.debug = self.doDebug or self.config['general']['debug_mode']
        self.remote &= self.config['remote']['activated']

        pid = self.isAlreadyRunning()
        # don't exit when in test runner
        if pid and not tests:
            print _("pyLoad already running with pid %s") % pid
            exit()

        if os.name != "nt" and self.config["general"]["renice"]:
            os.system("renice %d %d" % (self.config["general"]["renice"], os.getpid()))

        if self.config["permission"]["change_group"]:
            if os.name != "nt":
                try:
                    from grp import getgrnam

                    group = getgrnam(self.config["permission"]["group"])
                    os.setgid(group[2])
                except Exception, e:
                    print _("Failed changing group: %s") % e

        if self.config["permission"]["change_user"]:
            if os.name != "nt":
                try:
                    from pwd import getpwnam

                    user = getpwnam(self.config["permission"]["user"])
                    os.setuid(user[2])
                except Exception, e:
                    print _("Failed changing user: %s") % e

        if self.debug:
            self.init_logger(logging.DEBUG) # logging level
        else:
            self.init_logger(logging.INFO) # logging level

        self.do_kill = False
        self.do_restart = False
        self.shuttedDown = False

        self.log.info(_("Starting") + " pyLoad %s" % CURRENT_VERSION)
        self.log.info(_("Using home directory: %s") % getcwd())
	
        if not tests:
            self.writePidFile()

        self.captcha = True # checks seems to fail, although tesseract is available

        self.eventManager = self.evm = EventManager(self)
        self.setupDB()

        # Upgrade to configManager
        self.config = ConfigManager(self, self.config)

        if self.deleteLinks:
            self.log.info(_("All links removed"))
            self.db.purgeLinks()

        self.requestFactory = RequestFactory(self)
        __builtin__.pyreq = self.requestFactory

        # deferred import, could improve start-up time
        from module.Api import Api
        from module.AddonManager import AddonManager
        from module.interaction.InteractionManager import InteractionManager
        from module.threads.ThreadManager import ThreadManager

        Api.initComponents()
        self.api = Api(self)

        self.scheduler = Scheduler(self)

        #hell yeah, so many important managers :D
        self.pluginManager = PluginManager(self)
        self.interactionManager = self.im = InteractionManager(self)
        self.accountManager = AccountManager(self)
        self.threadManager = ThreadManager(self)
        self.addonManager = AddonManager(self)
        self.remoteManager = RemoteManager(self)

        self.js = JsEngine()

        # enough initialization for test cases
        if tests: return

        self.log.info(_("Download time: %s") % self.api.isTimeDownload())

        if rpc:
            self.remoteManager.startBackends()

        if web:
            self.init_webserver()

        dl_folder = self.config["general"]["download_folder"]

        if not exists(dl_folder):
            makedirs(dl_folder)

        spaceLeft = free_space(dl_folder)

        self.log.info(_("Free space: %s") % formatSize(spaceLeft))

        self.config.save() #save so config files gets filled

        link_file = join(pypath, "links.txt")

        if exists(link_file):
            f = open(link_file, "rb")
            if f.read().strip():
                self.api.addPackage("links.txt", [link_file], 1)
            f.close()

        link_file = "links.txt"
        if exists(link_file):
            f = open(link_file, "rb")
            if f.read().strip():
                self.api.addPackage("links.txt", [link_file], 1)
            f.close()

        #self.scheduler.addJob(0, self.accountManager.getAccountInfos)
        self.log.info(_("Activating Accounts..."))
        self.accountManager.refreshAllAccounts()

        #restart failed
        if self.config["download"]["restart_failed"]:
            self.log.info(_("Restarting failed downloads..."))
            self.api.restartFailed()
        
        self.threadManager.pause = False
        self.running = True

        self.addonManager.activateAddons()

        self.log.info(_("pyLoad is up and running"))
        self.eventManager.dispatchEvent("coreReady")

        #test api
#        from module.common.APIExerciser import startApiExerciser
#        startApiExerciser(self, 3)

        #some memory stats
#        from guppy import hpy
#        hp=hpy()
#        print hp.heap()
#        import objgraph
#        objgraph.show_most_common_types(limit=30)
#        import memdebug
#        memdebug.start(8002)
#        from meliae import scanner
#        scanner.dump_all_objects(self.path('objs.json'))

        locals().clear()

        while True:
            sleep(1.5)
            if self.do_restart:
                self.log.info(_("restarting pyLoad"))
                self.restart()
            if self.do_kill:
                self.shutdown()
                self.log.info(_("pyLoad quits"))
                self.removeLogger()
                _exit(0) #@TODO thrift blocks shutdown

            self.threadManager.work()
            self.interactionManager.work()
            self.scheduler.work()

    def setupDB(self):
        from module.database import DatabaseBackend
        from module.FileManager import FileManager

        self.db = DatabaseBackend(self) # the backend
        self.db.setup()

        self.files = FileManager(self)
        self.db.manager = self.files #ugly?

    def init_webserver(self):
        if self.config['webinterface']['activated']:
            self.webserver = WebServer(self)
            self.webserver.start()

    def init_logger(self, level):
        console = logging.StreamHandler(sys.stdout)

        # change current locale to default if it is not set
        current_locale = locale.getlocale()
        if current_locale == (None, None):
            current_locale = locale.setlocale(locale.LC_ALL, '')

        # We use timeformat provided by locale when available
        if current_locale != (None, None):
            tfrm = locale.nl_langinfo(locale.D_FMT) + " " + locale.nl_langinfo(locale.T_FMT)
        else: # normally this case should not be entered
            tfrm = "%d.%m.%Y %H:%M:%S"

        frm = logging.Formatter("%(asctime)s %(levelname)-8s  %(message)s", tfrm)
        console.setFormatter(frm)
        self.log = logging.getLogger("log") # setable in config

        if not exists(self.config['log']['log_folder']):
            makedirs(self.config['log']['log_folder'], 0700)

        if self.config['log']['file_log']:
            if self.config['log']['log_rotate']:
                file_handler = logging.handlers.RotatingFileHandler(join(self.config['log']['log_folder'], 'log.txt'),
                                                                    maxBytes=self.config['log']['log_size'] * 1024,
                                                                    backupCount=int(self.config['log']['log_count']),
                                                                    encoding="utf8")
            else:
                file_handler = logging.FileHandler(join(self.config['log']['log_folder'], 'log.txt'), encoding="utf8")

            file_handler.setFormatter(frm)
            self.log.addHandler(file_handler)

        self.log.addHandler(console) #if console logging
        self.log.setLevel(level)

    def removeLogger(self):
        for h in list(self.log.handlers):
            self.log.removeHandler(h)
            h.close()


    def restart(self):
        self.shutdown()
        chdir(owd)
        # close some open fds
        for i in range(3,50):
            try:
                close(i)
            except :
                pass

        execl(executable, executable, *sys.argv)
        _exit(0)

    def shutdown(self):
        self.log.info(_("shutting down..."))
        self.eventManager.dispatchEvent("coreShutdown")
        try:
            if self.config['webinterface']['activated'] and hasattr(self, "webserver"):
                pass # TODO: quit webserver?
#                self.webserver.quit()

            for thread in self.threadManager.threads:
                thread.put("quit")

            self.api.stopAllDownloads()
            self.addonManager.deactivateAddons()

        except:
            self.print_exc()
            self.log.info(_("error while shutting down"))

        finally:
            self.files.syncSave()
            self.db.shutdown()
            self.shuttedDown = True

        self.deletePidFile()

    def shell(self):
        """ stop and open an ipython shell inplace"""
        if self.debug:
            from IPython import embed
            sys.stdout = sys._stdout
            embed()

    def breakpoint(self):
        if self.debug:
            from IPython.core.debugger import Pdb
            sys.stdout = sys._stdout
            if not self.pdb: self.pdb = Pdb()
            self.pdb.set_trace()

    def print_exc(self):
        if self.debug:
            print_exc()

    def path(self, *args):
        return join(pypath, *args)

def deamon():
    try:
        pid = os.fork()
        if pid > 0:
            sys.exit(0)
    except OSError, e:
        print >> sys.stderr, "fork #1 failed: %d (%s)" % (e.errno, e.strerror)
        sys.exit(1)

    # decouple from parent environment 
    os.setsid()
    os.umask(0)

    # do second fork
    try:
        pid = os.fork()
        if pid > 0:
        # exit from second parent, print eventual PID before
            print "Daemon PID %d" % pid
            sys.exit(0)
    except OSError, e:
        print >> sys.stderr, "fork #2 failed: %d (%s)" % (e.errno, e.strerror)
        sys.exit(1)

    # Iterate through and close some file descriptors.
    for fd in range(0, 3):
        try:
            os.close(fd)
        except OSError:    # ERROR, fd wasn't open to begin with (ignored)
            pass

    os.open(os.devnull, os.O_RDWR)    # standard input (0)
    os.dup2(0, 1)            # standard output (1)
    os.dup2(0, 2)

    pyload_core = Core()
    pyload_core.start()


def main():
    #change name to 'pyLoadCore'
    #from module.lib.rename_process import renameProcess
    #renameProcess('pyLoadCore')
    if "--daemon" in sys.argv:
            deamon()
    else:
        pyload_core = Core()
        try:
            pyload_core.start()
        except KeyboardInterrupt:
            pyload_core.shutdown()
            pyload_core.log.info(_("killed pyLoad from terminal"))
            pyload_core.removeLogger()
            _exit(1)

# And so it begins... 
if __name__ == "__main__":
    main()