#! /usr/bin/env python
# -*- coding: utf-8 -*-
#
# PyKota : Print Quotas for CUPS
#
# (c) 2003-2013 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 3 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, see <http://www.gnu.org/licenses/>.
#
# $Id$
#
#

"""A print quote generator for PyKota"""

import sys
import os
import pwd

import pykota.appinit
from pykota.utils import run
from pykota.commandline import PyKotaOptionParser
from pykota.errors import PyKotaCommandLineError
from pykota.tool import PyKotaTool
from pykota.accounter import openAccounter

class PyKotMe(PyKotaTool) :
    """A class for pykotme."""
    def main(self, files, options) :
        """Gives print quotes."""
        if (not sys.stdin.isatty()) and ("-" not in files) :
            # TODO : create a named temporary file for standard input
            # TODO : because if there are several printers on the command
            # TODO : line and they have different preaccounter directives,
            # TODO : the standard input will already be consumed when looping
            # TODO : over the second printer below.
            files.append("-")

        printers = self.storage.getMatchingPrinters(options.printer)
        if not printers :
            raise PyKotaCommandLineError, _("There's no printer matching %s") % options.printer

        username = pwd.getpwuid(os.getuid())[0]
        if options.user :
            if not self.config.isAdmin :
                self.printInfo(_("The --user command line option will be ignored because you are not a PyKota Administrator."), "warn")
            else :
                username = options.user

        user = self.storage.getUser(username)
        if not user.Exists :
            self.printInfo(_("There's no user matching '%(username)s'.") \
                                              % locals(),
                           "error")
        else :
            if user.LimitBy and (user.LimitBy.lower() == "balance"):
                self.display("%s\n" % (_("Your account balance : %.2f") % (user.AccountBalance or 0.0)))

            sizeprinted = False
            done = {}
            for printer in printers :
                # Now fake some values. TODO : improve API to not need this anymore
                printername = printer.Name
                self.PrinterName = printer.Name
                self.JobSizeBytes = 1
                self.preaccounter = openAccounter(self, ispreaccounter=1)
                key = self.preaccounter.name + self.preaccounter.arguments
                if not done.has_key(key) :
                    totalsize = 0
                    inkusage = []
                    for filename in files :
                        self.DataFile = filename
                        self.preaccounter.beginJob(None)
                        self.preaccounter.endJob(None)
                        totalsize += self.preaccounter.getJobSize(None)
                        inkusage.extend(self.preaccounter.inkUsage)
                    done[key] = (totalsize, inkusage)
                (totalsize, inkusage) = done[key]
                if not sizeprinted :
                    self.display("%s\n" % (_("Job size : %i pages") % totalsize))
                    sizeprinted = True
                userpquota = self.storage.getUserPQuota(user, printer)
                if userpquota.Exists :
                    if (printer.MaxJobSize and (totalsize > printer.MaxJobSize)) \
                            or (userpquota.MaxJobSize and (totalsize > userpquota.MaxJobSize)) :
                        self.display("%s\n" % (_("User %(username)s is not allowed to print so many pages on printer %(printername)s at this time.") % locals()))
                    else :
                        cost = userpquota.computeJobPrice(totalsize, inkusage)
                        msg = _("Cost on printer %s : %.2f") % (printer.Name, cost)
                        if printer.PassThrough :
                            msg = "%s (%s)" % (msg, _("won't be charged, printer is in passthrough mode"))
                        elif user.LimitBy == "nochange" :
                            msg = "%s (%s)" % (msg, _("won't be charged, account is immutable"))
                        self.display("%s\n" % msg)
            if user.LimitBy == "noprint" :
                self.display("%s\n" % (_("User %(username)s is forbidden to print at this time.") % locals()))

if __name__ == "__main__" :
    parser = PyKotaOptionParser(description=_("Generates print quotes for end users."),
                                usage="pykotme [options] [files]")
    parser.add_option("-P", "--printer",
                            dest="printer",
                            default="*",
                            help=_("Acts on this printer only. You can specify several printer names by separating them with commas. The default value is '%default', which means all printers."))
    parser.add_option("-u", "--user",
                            dest="user",
                            help=_("Acts on this user only. Only one username can be specified this way. The default value is the name of the user who launched this command. This option is ignored when the command is not launched by a PyKota Administrator."))

    parser.add_example("--printer apple file1.ps <file2.pclxl",
                       _("This would show the number of pages needed to print these two files, as well as the cost of printing them to the 'apple' printer for the user who launched this command."))
    parser.add_example("--user john",
                       _("This would show the number of pages needed to print the content of the standard input, and the cost of printing this on all printers for user 'john'."))
    run(parser, PyKotMe)