#! /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 billing codes manager for PyKota."""

import os
import sys
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.storage import StorageBillingCode
from pykota.progressbar import Percent

class PKBcodes(PyKotaTool) :
    """A class for a billing codes manager."""
    def modifyBillingCode(self, billingcode, reset, description) :
        """Modifies a billing code."""
        if reset :
            billingcode.reset()
        if description is not None : # NB : "" is allowed !
            billingcode.setDescription(description)

    def main(self, names, options) :
        """Manage billing codes."""
        islist = (options.action == "list")
        isadd = (options.action == "add")
        isdelete = (options.action == "delete")

        if not islist :
            self.adminOnly()

        if not names :
            if isdelete or isadd :
                raise PyKotaCommandLineError, _("You must specify billing codes on the command line.")
            names = [u"*"]

        if not islist :
            percent = Percent(self)

        if not isadd :
            if not islist :
                percent.display("%s..." % _("Extracting datas"))
            if not names :
                names = ["*"]
            billingcodes = self.storage.getMatchingBillingCodes(",".join(names))
            if not billingcodes :
                if not islist :
                    percent.display("\n")
                raise PyKotaCommandLineError, _("There's no billingcode matching %s") % " ".join(names)
            if not islist :
                percent.setSize(len(billingcodes))

        if islist :
            for billingcode in billingcodes :
                self.display("%s [%s] %s %s %s %.2f %s\n" % \
                      (billingcode.BillingCode, billingcode.Description, \
                       billingcode.PageCounter, \
                       _("pages"), \
                       _("and"), \
                       billingcode.Balance, \
                       _("credits")))
        elif isdelete :
            percent.display("\n%s..." % _("Deletion"))
            self.storage.deleteManyBillingCodes(billingcodes)
            percent.display("\n")
        else :
            description = options.description
            if description :
                description = description.strip()

            self.storage.beginTransaction()
            try :
                if isadd :
                    percent.display("%s...\n" % _("Creation"))
                    percent.setSize(len(names))
                    for bname in names :
                        billingcode = StorageBillingCode(self.storage, bname)
                        self.modifyBillingCode(billingcode,
                                               options.reset,
                                               description)
                        oldbillingcode = self.storage.addBillingCode(billingcode)
                        if oldbillingcode is not None :
                            if options.skipexisting :
                                self.logdebug(_("Billing code '%(bname)s' already exists, skipping.") % locals())
                            else :
                                self.logdebug(_("Billing code '%(bname)s' already exists, will be modified.") % locals())
                                self.modifyBillingCode(oldbillingcode,
                                                       options.reset,
                                                       description)
                                oldbillingcode.save()
                        percent.oneMore()
                else :
                    percent.display("\n%s...\n" % _("Modification"))
                    for billingcode in billingcodes :
                        self.modifyBillingCode(billingcode,
                                               options.reset,
                                               description)
                        billingcode.save()
                        percent.oneMore()
            except :
                self.storage.rollbackTransaction()
                raise
            else :
                self.storage.commitTransaction()

        if not islist :
            percent.done()

if __name__ == "__main__" :
    parser = PyKotaOptionParser(description=_("A billing codes manager for PyKota."),
                                usage="pkbcodes [options] code1 code2 ... codeN")
    parser.add_option("-a", "--add",
                            action="store_const",
                            const="add",
                            dest="action",
                            help=_("Add new, or modify existing, billing codes."))
    parser.add_option("-d", "--delete",
                            action="store_const",
                            const="delete",
                            dest="action",
                            help=_("Deletes billing codes. Matching entries in the printing history are not deleted, on purpose."))
    parser.add_option("-D", "--description",
                            dest="description",
                            help=_("Set a textual description for the specified billing codes."))
    parser.add_option("-l", "--list",
                            action="store_const",
                            const="list",
                            dest="action",
                            help=_("Display detailed informations about the specified billing codes."))
    parser.add_option("-r", "--reset",
                            action="store_true",
                            dest="reset",
                            help=_("Reset the page count and amount spent for the specified billing codes."))
    parser.add_option("-s", "--skipexisting",
                            action="store_true",
                            dest="skipexisting",
                            help=_("If --add is used, ensure that existing billing codes won't be modified."))

    parser.add_example('-D "Financial Department" financial',
                       _("Would create a billing code labelled 'financial' with the specified textual description."))
    parser.add_example('--delete "fin*"',
                       _("Would delete all billing codes which label begins with 'fin'. Matching jobs in the printing history wouldn't be deleted though."))
    parser.add_example("--list",
                       _("Would display details about all existing billing codes."))

    (options, arguments) = parser.parse_args()
    run(parser, PKBcodes)