#! /usr/bin/env python
# -*- coding: ISO-8859-15 -*-

# PyKota Turn Key tool
#
# PyKota - Print Quotas for CUPS and LPRng
#
# (c) 2003, 2004, 2005 Jerome Alet <alet@librelogiciel.com>
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# $Id$
#
#

import sys
import os
import pwd

from pykota.tool import Tool, PyKotaToolError, crashed, N_

__doc__ = N_("""pkturnkey v%(__version__)s (c) %(__years__)s %(__author__)s

A turn key tool for PyKota. When launched, this command will initialize
PyKota's database with all existing print queues and some or all users.
For now, no prices or limits are set, so printing is fully accounted
for, but not limited.

command line usage :

  pkturnkey [options]

options :

  -v | --version       Prints pkturnkey version number then exits.
  -h | --help          Prints this message then exits.
  
  -u | --uidmin uid    Only adds users whose uid is greater than or equal to
                       uid. You can pass an username there as well, and its
                       uid will be used automatically.
                       If not set, 0 will be used automatically.
                       
  -U | --uidmax uid    Only adds users whose uid is lesser than or equal to
                       uid. You can pass an username there as well, and its
                       uid will be used automatically.
                       If not set, a large value will be used automatically.

examples :                              

  $ pkturnkey --uidmin jerome

  Will initialize PyKota's database will all existing printers and
  create print accounts for all users whose uid is greater than or
  equal to jerome's one.
""")
        
class PKTurnKey(Tool) :
    """A class for an initialization tool."""
    def listPrinters(self) :
        """Returns a list of tuples (queuename, deviceuri) for all existing print queues."""
        self.logdebug("Extracting all print queues.")
        result = os.popen("lpstat -v", "r")
        lines = result.readlines()
        result.close()
        printers = []
        for line in lines :
            (begin, end) = line.split(':', 1)
            deviceuri = end.strip()
            queuename = begin.split()[-1]
            printers.append((queuename, deviceuri))
        return printers    
        
    def listUsers(self, uidmin, uidmax) :    
        """Returns a list of usernames whose uids are between uidmin and uidmax."""
        self.logdebug("Extracting all users whose uid is between %s and %s." % (uidmin, uidmax))
        return [entry[0] for entry in pwd.getpwall() if uidmin <= entry[2] <= uidmax]
        
    def createPrinters(self, printers) :    
        """Creates all printers in PyKota's database."""
        needswarning = [p[0] for p in printers if p[1].find("cupspykota") == -1]
        command = "pkprinters --add %s" % " ".join(['"%s"' % p[0] for p in printers])
        self.logdebug("Launching : %s" % command)
        os.system(command)
        
    def createUsers(self, users) :    
        """Creates all users in PyKota's database."""
        command = "edpykota --add --noquota %s" % " ".join(['"%s"' % u for u in users])
        self.logdebug("Launching : %s" % command)
        os.system(command)
        
    def main(self, names, options) :
        """Intializes PyKota's database."""
        if not self.config.isAdmin :
            raise PyKotaToolError, "%s : %s" % (pwd.getpwuid(os.geteuid())[0], _("You're not allowed to use this command."))
            
        # TODO : names not used for now    
        if not names :
            names = ["*"]
            
        if not options["uidmin"] :    
            self.printInfo(_("System users will have a print account as well !"), "warn")
            uidmin = 0
        else :    
            try :
                uidmin = int(options["uidmin"])
            except :    
                try :
                    uidmin = pwd.getpwnam(options["uidmin"])[2]
                except KeyError, msg :    
                    raise PyKotaToolError, _("Unknown username %s : %s") % (options["uidmin"], msg)
                    
        if not options["uidmax"] :    
            uidmax = sys.maxint
        else :    
            try :
                uidmax = int(options["uidmax"])
            except :    
                try :
                    uidmax = pwd.getpwnam(options["uidmax"])[2]
                except KeyError, msg :    
                    raise PyKotaToolError, _("Unknown username %s : %s") % (options["uidmax"], msg)
                    
        if uidmin > uidmax :            
            (uidmin, uidmax) = (uidmax, uidmin)
        users = self.listUsers(uidmin, uidmax)
        printers = self.listPrinters()                    
        
        print "Please be patient...",
        sys.stdout.flush()
        self.createPrinters(printers)
        self.createUsers(users)
        print
        print "Database initialized."
                    
                     
if __name__ == "__main__" : 
    retcode = 0
    try :
        short_options = "hvu:U:"
        long_options = ["help", "version", "uidmin=", "uidmax="]
        
        # Initializes the command line tool
        manager = PKTurnKey(doc=__doc__)
        manager.deferredInit()
        
        # parse and checks the command line
        (options, args) = manager.parseCommandline(sys.argv[1:], \
                                                   short_options, \
                                                   long_options, \
                                                   allownothing=1)
        
        # sets long options
        options["help"] = options["h"] or options["help"]
        options["version"] = options["v"] or options["version"]
        options["uidmin"] = options["u"] or options["uidmin"]
        options["uidmax"] = options["U"] or options["uidmax"]
        
        if options["help"] :
            manager.display_usage_and_quit()
        elif options["version"] :
            manager.display_version_and_quit()
        else :
            retcode = manager.main(args, options)
    except KeyboardInterrupt :        
        sys.stderr.write("\nInterrupted with Ctrl+C !\n")
    except SystemExit :        
        pass
    except :
        try :
            manager.crashed("pkturnkey failed")
        except :    
            crashed("pkturnkey failed")
        retcode = -1

    try :
        manager.storage.close()
    except (TypeError, NameError, AttributeError) :    
        pass
        
    sys.exit(retcode)