#! /usr/bin/env python
# -*- coding: utf-8 -*-*-
#
# PyKota : Print Quotas for CUPS
#
# (c) 2003, 2004, 2005, 2006, 2007, 2008 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 refunding tool for PyKota"""

import sys
import os
import pwd
import time
import cStringIO

try :
    from reportlab.pdfgen import canvas
    from reportlab.lib import pagesizes
    from reportlab.lib.units import cm
except ImportError :    
    hasRL = False
else :    
    hasRL = True
    
try :
    import PIL.Image 
except ImportError :    
    hasPIL = False
else :    
    hasPIL = True

import pykota.appinit
from pykota.utils import run
from pykota.commandline import PyKotaOptionParser, \
                               checkandset_pagesize, \
                               checkandset_positiveint
from pykota.pdfutils import getPageSize
from pykota.errors import PyKotaToolError, PyKotaCommandLineError
from pykota.tool import Percent, PyKotaTool
        
class PKRefund(PyKotaTool) :        
    """A class for refund manager."""
    validfilterkeys = [ "username",
                        "printername",
                        "hostname",
                        "jobid",
                        "billingcode",
                        "start",
                        "end",
                      ]
                      
    def printVar(self, label, value, size) :
        """Outputs a variable onto the PDF canvas.
        
           Returns the number of points to substract to current Y coordinate.
        """   
        xcenter = (self.pagesize[0] / 2.0) - 1*cm
        self.canvas.saveState()
        self.canvas.setFont("Helvetica-Bold", size)
        self.canvas.setFillColorRGB(0, 0, 0)
        self.canvas.drawRightString(xcenter, self.ypos, "%s :" % label)
        self.canvas.setFont("Courier-Bold", size)
        self.canvas.setFillColorRGB(0, 0, 1)
        self.canvas.drawString(xcenter + 0.5*cm, self.ypos, value)
        self.canvas.restoreState()
        self.ypos -= (size + 4)
        
    def pagePDF(self, receiptnumber, name, values, unit, reason) :
        """Generates a new page in the PDF document."""
        if values["nbpages"] :
            self.canvas.doForm("background")
            self.ypos = self.yorigine - (cm + 20)
            self.printVar(_("Refunding receipt"), "#%s" % receiptnumber, 22)
            self.printVar(_("Username"), name, 22)
            self.ypos -= 20
            datetime = time.strftime("%c", time.localtime()).decode(self.charset, "replace")
            self.printVar(_("Edited on"), datetime, 14)
                
            self.ypos -= 20
            self.printVar(_("Jobs refunded"), str(values["nbjobs"]), 18)
            self.printVar(_("Pages refunded"), str(values["nbpages"]), 18)
            self.printVar(_("Amount refunded"), "%.3f %s" % (values["nbcredits"], unit), 18)
            self.ypos -= 20
            self.printVar(_("Reason"), reason, 14)
            self.canvas.showPage()
            return 1
        return 0    
        
    def initPDF(self, logo) :
        """Initializes the PDF document."""
        self.pdfDocument = cStringIO.StringIO()        
        self.canvas = c = canvas.Canvas(self.pdfDocument, \
                                        pagesize=self.pagesize, \
                                        pageCompression=1)
        
        c.setAuthor(self.effectiveUserName)
        c.setTitle(_("PyKota print job refunding receipts"))
        c.setSubject(_("Print job refunding receipts generated with PyKota"))
        
        self.canvas.beginForm("background")
        self.canvas.saveState()
        
        self.ypos = self.pagesize[1] - (2 * cm)            
        
        xcenter = self.pagesize[0] / 2.0
        if logo :
            try :    
                imglogo = PIL.Image.open(logo)
            except IOError :    
                self.printInfo("Unable to open image %s" % logo, "warn")
            else :
                (width, height) = imglogo.size
                multi = float(width) / (8 * cm) 
                width = float(width) / multi
                height = float(height) / multi
                self.ypos -= height
                c.drawImage(logo, xcenter - (width / 2.0), \
                                  self.ypos, \
                                  width, height)
        
        self.ypos -= (cm + 20)
        self.canvas.setFont("Helvetica-Bold", 14)
        self.canvas.setFillColorRGB(0, 0, 0)
        msg = _("Here's the receipt for the refunding of your print jobs")
        self.canvas.drawCentredString(xcenter, self.ypos, "%s :" % msg)
        
        self.yorigine = self.ypos
        self.canvas.restoreState()
        self.canvas.endForm()
        
    def endPDF(self, fname) :    
        """Flushes the PDF generator."""
        self.canvas.save()
        if fname != "-" :        
            outfile = open(fname, "w")
            outfile.write(self.pdfDocument.getvalue())
            outfile.close()
        else :    
            sys.stdout.write(self.pdfDocument.getvalue())
            sys.stdout.flush()
        
    def genReceipts(self, peruser, logo, outfname, firstnumber, reason, unit) :
        """Generates the receipts file."""
        if len(peruser) :
            percent = Percent(self, size=len(peruser))
            if outfname != "-" :
                percent.display("%s...\n" % _("Generating receipts"))
                
            self.initPDF(logo)
            number = firstnumber
            for (name, values) in peruser.items() :
                number += self.pagePDF(number, name, values, unit, reason)
                if outfname != "-" :
                    percent.oneMore()
                    
            if number > firstnumber :
                self.endPDF(outfname)
                
            if outfname != "-" :
                percent.done()
        
    def main(self, arguments, options) :
        """Refunds jobs."""
        if not hasRL :
            raise PyKotaToolError, "The ReportLab module is missing. Download it from http://www.reportlab.org"
        if not hasPIL :
            raise PyKotaToolError, "The Python Imaging Library is missing. Download it from http://www.pythonware.com/downloads"
            
        self.adminOnly()    
            
        self.pagesize = getPageSize(options.pagesize)
        
        if (not options.reason) or (not options.reason.strip()) :
            raise PyKotaCommandLineError, _("Refunding for no reason is forbidden. Please use the --reason command line option.")
            
        extractonly = {}
        for filterexp in arguments :
            if filterexp.strip() :
                try :
                    (filterkey, filtervalue) = [part.strip() for part in filterexp.split("=")]
                    filterkey = filterkey.lower()
                    if filterkey not in self.validfilterkeys :
                        raise ValueError                
                except ValueError :    
                    raise PyKotaCommandLineError, _("Invalid filter value [%s], see help.") % filterexp
                else :    
                    extractonly.update({ filterkey : filtervalue })
            
        percent = Percent(self)
        outfname = options.output.strip().encode(sys.getfilesystemencoding())
        if outfname != "-" :
            percent.display("%s..." % _("Extracting datas"))
        else :    
            options.force = True
            self.printInfo(_("The PDF file containing the receipts will be sent to stdout. --force is assumed."), "warn")
            
        username = extractonly.get("username")    
        if username :
            user = self.storage.getUser(username)
        else :
            user = None
            
        printername = extractonly.get("printername")    
        if printername :
            printer = self.storage.getPrinter(printername)
        else :    
            printer = None
            
        start = extractonly.get("start")
        end = extractonly.get("end")
        (start, end) = self.storage.cleanDates(start, end)
        
        jobs = self.storage.retrieveHistory(user=user,    
                                            printer=printer, 
                                            hostname=extractonly.get("hostname"),
                                            billingcode=extractonly.get("billingcode"),
                                            jobid=extractonly.get("jobid"),
                                            start=start,
                                            end=end,
                                            limit=0)
                                            
        peruser = {}                                    
        nbjobs = 0                                    
        nbpages = 0                                            
        nbcredits = 0.0
        percent.setSize(len(jobs))
        if outfname != "-" :
            percent.display("\n")
        for job in jobs :                                    
            if job.JobSize and (job.JobAction not in ("DENY", "CANCEL", "REFUND")) :
                if options.force :
                    nbpages += job.JobSize
                    nbcredits += job.JobPrice
                    counters = peruser.setdefault(job.UserName, { "nbjobs" : 0, "nbpages" : 0, "nbcredits" : 0.0 })
                    counters["nbpages"] += job.JobSize
                    counters["nbcredits"] += job.JobPrice
                    job.refund(options.reason)
                    counters["nbjobs"] += 1
                    nbjobs += 1
                    if outfname != "-" :
                        percent.oneMore()
                else :    
                    print _("Date : %s") % str(job.JobDate)[:19]
                    print _("Printer : %s") % job.PrinterName
                    print _("User : %s") % job.UserName
                    print _("JobId : %s") % job.JobId
                    print _("Title : %s") % job.JobTitle
                    if job.JobBillingCode :
                        print _("Billing code : %s") % job.JobBillingCode
                    print _("Pages : %i") % job.JobSize
                    print _("Credits : %.3f") % job.JobPrice
                    
                    while True :                             
                        answer = raw_input("\t%s ? " % _("Refund (Y/N)")).strip().upper()
                        if answer == _("Y") :
                            nbpages += job.JobSize
                            nbcredits += job.JobPrice
                            counters = peruser.setdefault(job.UserName, { "nbjobs" : 0, "nbpages" : 0, "nbcredits" : 0.0 })
                            counters["nbpages"] += job.JobSize
                            counters["nbcredits"] += job.JobPrice
                            job.refund(options.reason)
                            counters["nbjobs"] += 1
                            nbjobs += 1
                            break    
                        elif answer == _("N") :    
                            break
                    print        
        if outfname != "-" :
            percent.done()
        self.genReceipts(peruser, 
                         options.logo.strip().encode(sys.getfilesystemencoding()), 
                         outfname, 
                         options.number, 
                         options.reason, 
                         options.unit or _("Credits"))
        if outfname != "-" :    
            nbusers = len(peruser)
            print _("Refunded %(nbusers)i users for %(nbjobs)i jobs, %(nbpages)i pages and %(nbcredits).3f credits") \
                     % locals()
            
if __name__ == "__main__" : 
    parser = PyKotaOptionParser(description=_("Refunding tool for PyKota."),
                                usage="pkrefund [options] [filterexpr]")
    parser.add_option("-f", "--force",
                            dest="force",
                            action="store_true",
                            help=_("Doesn't ask for confirmation before refunding."))
    parser.add_option("-l", "--logo",
                            dest="logo",
                            default=u"/usr/share/pykota/logos/pykota.jpeg",
                            help=_("The image to use as a logo. The logo will be drawn at the center top of the page. The default logo is %default."))
    parser.add_option("-p", "--pagesize",
                            type="string",
                            action="callback",
                            callback=checkandset_pagesize,
                            dest="pagesize",
                            default=u"A4",
                            help=_("Set the size of the page. Most well known page sizes are recognized, like 'A4' or 'Letter' to name a few. The default page size is %default."))
    parser.add_option("-n", "--number",                        
                            dest="number",
                            type="int",
                            action="callback",
                            callback=checkandset_positiveint,
                            default=1,
                            help=_("Sets the number of the first receipt. This number will automatically be incremented for each receipt. The default value is %default."))
    parser.add_option("-o", "--output",
                            dest="output",
                            type="string",
                            default=u"-",
                            help=_("The name of the file to which the PDF receipts will be written. If not set or set to '%default', the PDF document will be sent to the standard output."))
    parser.add_option("-r", "--reason",
                            dest="reason",
                            type="string",
                            help=_("The reason why there was a refund."))
                            
    # TODO : due to Python's optparse.py bug #1498146 fixed in rev 46861
    # TODO : we can't use 'default=_("Credits")' for this option
    parser.add_option("-u", "--unit",                   
                            dest="unit",
                            type="string",
                            help=_("The name of the unit to use on the receipts. The default value is 'Credits' or its locale translation."))
                            
    parser.add_filterexpression("username", _("User's name"))
    parser.add_filterexpression("printername", _("Printer's name"))
    parser.add_filterexpression("hostname", _("Host's name"))
    parser.add_filterexpression("jobid", _("Job's id"))
    parser.add_filterexpression("billingcode", _("Job's billing code"))
    parser.add_filterexpression("start", _("Job's date of printing"))
    parser.add_filterexpression("end", _("Job's date of printing"))
    
    parser.add_example('--output /tmp/receipts.pdf jobid=503',
                       _("This would refund all jobs which Id is 503. A confirmation would be asked for each job to refund, and a PDF file named /tmp/receipts.pdf would be created containing printable receipts. BEWARE of job ids rolling over if you reset CUPS' history."))
  
    parser.add_example('--reason "Hardware problem" jobid=503 start=today-7',
                       _("This would refund all jobs which id is 503 but which would have been printed during the  past week. The reason would be marked as being an hardware problem."))
  
    parser.add_example('--force username=jerome printername=HP2100',
                       _("This would refund all jobs printed by user jerome on printer HP2100. No confirmation would be asked."))
  
    parser.add_example('--force printername=HP2100 start=200602 end=yesterday',
                       _("This would refund all jobs printed on printer HP2100 between February 1st 2006 and yesterday. No confirmation would be asked."))
    
    (options, arguments) = parser.parse_args()
    run(parser, PKRefund)