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

# PyKota tool to hint for printer accounters
#
# 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

from pykota.tool import Tool, PyKotaToolError, crashed, N_
try :
    import pysnmp
except ImportError :    
    hasSNMP = 0
else :    
    hasSNMP = 1

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

A tool to give hints on what accounting method is best for each printer.

command line usage :

  pkhint [options] [printer1 printer2 printer3 ... printerN] <file.conf

options :

  -v | --version       Prints pkhint's version number then exits.
  -h | --help          Prints this message then exits.
  
examples :                              

  $ pkhint "hp*" printer103 </etc/cups/printers.conf
  
  Will analyze your printing system to test which accounter
  is the best for each of the defined printer which
  name matches one of the parameters.
  
  If you don't pass any argument on the command line, all
  printers will be analyzed.
""")
        
SNMPTESTS = [ \
              'npadmin --pagecount %(printer)s 2>/dev/null', \
              'snmpget -v1 -c public -Ov %(printer)s mib-2.43.10.2.1.4.1.1 2>/dev/null | cut -f 2,2 -d " "', \
              'snmpwalk -v 1 -Cc -c public %(printer)s 2>/dev/null | grep mib-2.43.10.2.1.4.1.1 | cut -d " " -f4', \
              'snmpwalk -v 1 -Cc -c public -Ov %(printer)s 2>/dev/null | grep Counter32 | tail -2 | head -1 | cut -d " " -f2', \
            ]
            
NETPJLTESTS = [ \
                '/usr/share/pykota/pagecount.pl %(printer)s %(port)s 2>/dev/null', \
                'nc -w 2 %(printer)s %(port)s </usr/share/pykota/pagecount.pjl 2>/dev/null | tail -2', \
              ]
              
class PKHint(Tool) :
    """A class to autodetect the best accounting method for printers."""
    def extractPrintersInformation(self) :    
        """Extracts printer information from the printing system.
          
           Returns a mapping { queuename : device, ... }
        """   
        printers = {}
        current_printer = None
        for line in [l.strip() for l in sys.stdin.readlines()] :
            testline = line.lower()
            if testline.startswith("<printer ") or testline.startswith("<defaultprinter ") :
                # beginning of a CUPS printer definition
                current_printer = line.split()[-1][:-1]
            elif testline.startswith("</printer ") :
                # end of a CUPS printer definition
                current_printer = None
            elif testline.startswith("deviceuri ") :
                # CUPS printer device_uri
                device = testline.split()[-1]
                if current_printer is not None :
                    printers[current_printer] = device
            else :        
                # LPRng printcap specific code here
                pass
        return printers
        
    def extractDevices(self) :    
        """Extracts the list of available CUPS devices.
        
           Returns a mapping { device : devicetype, ... }
           
           WARNING : CUPS ONLY FOR NOW
        """   
        inp = os.popen("lpinfo -v 2>/dev/null")
        deviceslist = [l.strip() for l in inp.readlines()]
        inp.close()
        devicestypes = {}
        for device in deviceslist :
            (dtype, dname) = device.split()
            devicestypes[dname] = dtype
        return devicestypes
        
    def searchDeviceType(self, devicestypes, device) :    
        """Returns the device type for current device."""
        if device.startswith("cupspykota:") :
            fulldevice = device[:]
            device = fulldevice[len("cupspykota:"):]
            if device.startswith("//") :
                device = device[2:]
        for (k, v) in devicestypes.items() :
            if device.startswith(k) :
                return v
                
    def extractDeviceFromURI(self, device) :    
        """Cleans the device URI to remove any trace of PyKota."""
        if device.startswith("cupspykota:") :
            fulldevice = device[:]
            device = fulldevice[len("cupspykota:"):]
            if device.startswith("//") :
                device = device[2:]
        try :
            (backend, destination) = device.split(":", 1) 
        except ValueError :    
            raise PyKotaToolError, _("Invalid DeviceURI : %s") % device
        while destination.startswith("/") :
            destination = destination[1:]
        checkauth = destination.split("@", 1)    
        if len(checkauth) == 2 :
            destination = checkauth[1]
        return destination.split("/")[0]
        
    def accepts(self, commands, printer, port=None) :    
        """Tries to get the printer's internal page counter via SNMP."""
        for command in commands :
            inp = os.popen(command % locals())
            value = inp.readline().strip()
            inp.close()
            try :
                pagecounter = int(value)
            except :    
                pass
            else :    
                if port is None :
                    return command
                else :    
                    return command.replace("%(port)s", str(port))
        
    def main(self, args, options) :
        """Main work is done here."""
        os.environ["PATH"] = "%s:/bin:/usr/bin:/usr/local/bin:/opt/bin:/sbin:/usr/sbin" % os.environ.get("PATH", "")
        sys.stderr.write("BEWARE : This tool doesn't support LPRng's printcap files yet.\n")
        print _("\nPlease wait while pkhint analyzes your printing system's configuration...")
        printers = self.extractPrintersInformation()
        devicestypes = self.extractDevices() # TODO : IT'S CUPS ONLY FOR NOW
        configuration = []
        for (printer, deviceuri) in printers.items() :
            if self.matchString(printer, args) :
                devicetype = self.searchDeviceType(devicestypes, deviceuri)
                device = self.extractDeviceFromURI(deviceuri)
                if devicetype is None :
                    self.printInfo(_("Unknown device %s for printer %s") % (device, printer))
                elif devicetype == "network" :
                    try :
                        hostname, port = device.split(':')
                    except ValueError :    
                        hostname = device
                        port = 9100             # TODO : may cause problems with other protocols.
                        
                    snmpcommand = self.accepts(SNMPTESTS, hostname)
                    if snmpcommand is not None :
                        if hasSNMP and snmpcommand.startswith("snmpget ") :
                            # don't do a more complex test, just consider it will work
                            accounter = 'hardware(snmp)'
                        else :    
                            accounter = 'hardware(/usr/share/pykota/waitprinter.sh %(printer)s && ' + snmpcommand + ')'
                        configuration.append((printer, accounter))
                    else :    
                        netpjlcommand = self.accepts(NETPJLTESTS, hostname, port)
                        if netpjlcommand is not None :
                            #accounter = 'hardware(' + netpjlcommand + ')'
                            accounter = 'hardware(pjl)'
                            configuration.append((printer, accounter))
                        else :    
                            configuration.append((printer, "software()"))
                else :
                    configuration.append((printer, "software()"))
                    
        if not configuration :            
            print "\nSorry, pkhint can't help you for now. Please configure PyKota manually."
        else :
            print _("\nPut the following lines into your /etc/pykota/pykota.conf file :\n")
            print _("# BEWARE : if software accounting is suggested, this doesn't mean")
            print _("# that hardware accounting wouldn't work, this only means that PyKota")
            print _("# wasn't able to autodetect which hardware accounting method to use.")
            for (printer, accounter) in configuration :
                print "[%s]" % printer
                print "accounter: %s" % accounter
                print    
        
if __name__ == "__main__" : 
    retcode = 0
    try :
        short_options = "hv"
        long_options = ["help", "version"]
        
        # Initializes the command line tool
        manager = PKHint(doc=__doc__)
        manager.deferredInit()
        
        (options, args) = manager.parseCommandline(sys.argv[1:], short_options, long_options)
        
        # sets long options
        options["help"] = options["h"] or options["help"]
        options["version"] = options["v"] or options["version"]
        
        if options["help"] :
            manager.display_usage_and_quit()
        elif options["version"] :
            manager.display_version_and_quit()
        else :
            if not args :
                args = [ "*" ]
            retcode = manager.main(args, options)
    except KeyboardInterrupt :        
        sys.stderr.write("\nInterrupted with Ctrl+C !\n")
    except SystemExit :        
        pass
    except :
        try :
            manager.crashed("pkhint failed")
        except :    
            crashed("pkhint failed")
        retcode = -1
        
    sys.exit(retcode)