# -*- coding: utf-8 -*-
#
# (c) Copyright 2003-2007 Hewlett-Packard Development Company, L.P.
#
# 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
#
# Author: Don Welch
#

# Std Lib
import os, os.path, gzip
import re, time, urllib, tempfile, glob

# Local
from base.g import *
from base import utils

# Handle case where cups.py (via device.py) is loaded
# and cupsext doesn't exist yet. This happens in the
# installer and in a fresh sandbox if the Python extensions
# aren't installed yet.
try:
    import cupsext
except ImportError:
    if not os.getenv("HPLIP_BUILD"):
        log.error("CUPSEXT could not be loaded. Please check HPLIP installation.")
        sys.exit(1)

nickname_pat = re.compile(r'''\*NickName:\s*\"(.*)"''', re.MULTILINE)

IPP_PRINTER_STATE_IDLE = 3
IPP_PRINTER_STATE_PROCESSING = 4
IPP_PRINTER_STATE_STOPPED = 5

PPD_UI_BOOLEAN = 0   # True or False option
PPD_UI_PICKONE = 1   # Pick one from a list
PPD_UI_PICKMANY = 2  # Pick zero or more from a list

# Non-std
UI_SPINNER = 100           # Simple spinner with opt. suffix (ie, %)
UI_UNITS_SPINNER = 101     # Spinner control w/pts, cm, in, etc. units
UI_BANNER_JOB_SHEETS = 102 # dual combos for banner job-sheets

# ipp_op_t
IPP_PAUSE_PRINTER = 0x0010
IPP_RESUME_PRINTER = 0x011
IPP_PURGE_JOBS = 0x012
CUPS_GET_DEFAULT = 0x4001
CUPS_GET_PRINTERS = 0x4002
CUPS_ADD_MODIFY_PRINTER = 0x4003
CUPS_DELETE_PRINTER = 0x4004
CUPS_GET_CLASSES = 0x4005
CUPS_ADD_MODIFY_CLASS = 0x4006
CUPS_DELETE_CLASS = 0x4007
CUPS_ACCEPT_JOBS = 0x4008
CUPS_REJECT_JOBS = 0x4009
CUPS_SET_DEFAULT = 0x400a
CUPS_GET_DEVICES = 0x400b
CUPS_GET_PPDS = 0x400c
CUPS_MOVE_JOB = 0x400d
CUPS_AUTHENTICATE_JOB = 0x400e

# ipp_jstate_t
IPP_JOB_PENDING = 3    # Job is waiting to be printed
IPP_JOB_HELD = 4       # Job is held for printing
IPP_JOB_PROCESSING = 5 # Job is currently printing
IPP_JOB_STOPPED = 6    # Job has been stopped
IPP_JOB_CANCELLED = 7  # Job has been cancelled
IPP_JOB_ABORTED = 8    # Job has aborted due to error
IPP_JOB_COMPLETED = 8  # Job has completed successfully

# ipp_status_e
IPP_OK = 0x0000 # successful-ok 
IPP_OK_SUBST = 0x001 # successful-ok-ignored-or-substituted-attributes 
IPP_OK_CONFLICT = 0x002 # successful-ok-conflicting-attributes 
IPP_OK_IGNORED_SUBSCRIPTIONS = 0x003 # successful-ok-ignored-subscriptions 
IPP_OK_IGNORED_NOTIFICATIONS = 0x004 # successful-ok-ignored-notifications 
IPP_OK_TOO_MANY_EVENTS = 0x005 # successful-ok-too-many-events 
IPP_OK_BUT_CANCEL_SUBSCRIPTION = 0x006 # successful-ok-but-cancel-subscription 
IPP_OK_EVENTS_COMPLETE = 0x007 # successful-ok-events-complete 
IPP_REDIRECTION_OTHER_SITE = 0x300
IPP_BAD_REQUEST = 0x0400 # client-error-bad-request 
IPP_FORBIDDEN = 0x0401 # client-error-forbidden 
IPP_NOT_AUTHENTICATED = 0x0402 # client-error-not-authenticated 
IPP_NOT_AUTHORIZED = 0x0403 # client-error-not-authorized 
IPP_NOT_POSSIBLE = 0x0404 # client-error-not-possible 
IPP_TIMEOUT = 0x0405 # client-error-timeout 
IPP_NOT_FOUND = 0x0406 # client-error-not-found 
IPP_GONE = 0x0407 # client-error-gone 
IPP_REQUEST_ENTITY = 0x0408 # client-error-request-entity-too-large 
IPP_REQUEST_VALUE = 0x0409 # client-error-request-value-too-long 
IPP_DOCUMENT_FORMAT = 0x040a # client-error-document-format-not-supported 
IPP_ATTRIBUTES = 0x040b # client-error-attributes-or-values-not-supported 
IPP_URI_SCHEME = 0x040c # client-error-uri-scheme-not-supported 
IPP_CHARSET = 0x040d # client-error-charset-not-supported 
IPP_CONFLICT = 0x040e # client-error-conflicting-attributes 
IPP_COMPRESSION_NOT_SUPPORTED = 0x040f # client-error-compression-not-supported 
IPP_COMPRESSION_ERROR = 0x0410 # client-error-compression-error 
IPP_DOCUMENT_FORMAT_ERROR = 0x0411 # client-error-document-format-error 
IPP_DOCUMENT_ACCESS_ERROR = 0x0412 # client-error-document-access-error 
IPP_ATTRIBUTES_NOT_SETTABLE = 0x0413 # client-error-attributes-not-settable 
IPP_IGNORED_ALL_SUBSCRIPTIONS = 0x0414 # client-error-ignored-all-subscriptions 
IPP_TOO_MANY_SUBSCRIPTIONS = 0x0415 # client-error-too-many-subscriptions 
IPP_IGNORED_ALL_NOTIFICATIONS = 0x0416 # client-error-ignored-all-notifications 
IPP_PRINT_SUPPORT_FILE_NOT_FOUND = 0x0417 # client-error-print-support-file-not-found 
IPP_INTERNAL_ERROR = 0x0500 # server-error-internal-error 
IPP_OPERATION_NOT_SUPPORTED = 0x0501 # server-error-operation-not-supported 
IPP_SERVICE_UNAVAILABLE = 0x0502 # server-error-service-unavailable 
IPP_VERSION_NOT_SUPPORTED = 0x0503 # server-error-version-not-supported 
IPP_DEVICE_ERROR = 0x0504 # server-error-device-error 
IPP_TEMPORARY_ERROR = 0x0505 # server-error-temporary-error 
IPP_NOT_ACCEPTING = 0x0506 # server-error-not-accepting-jobs 
IPP_PRINTER_BUSY = 0x0507 # server-error-busy 
IPP_ERROR_JOB_CANCELLED = 0x0508 # server-error-job-canceled 
IPP_MULTIPLE_JOBS_NOT_SUPPORTED = 0x0509 # server-error-multiple-document-jobs-not-supported 
IPP_PRINTER_IS_DEACTIVATED = 0x050a # server-error-printer-is-deactivated 

CUPS_ERROR_BAD_NAME = 0x0f00
CUPS_ERROR_BAD_PARAMETERS = 0x0f01



def restartCUPS(): # must be root. How do you check for this?
    os.system('killall -HUP cupsd')

def getPPDPath(addtional_paths=None):
    """
        Returns the CUPS ppd path (not the foomatic one under /usr/share/ppd).
        Usually this is /usr/share/cups/model.
    """
    if addtional_paths is None:
        addtional_paths = []

    search_paths = prop.ppd_search_path.split(';') + addtional_paths

    for path in search_paths:
        ppd_path = os.path.join(path, 'cups/model')
        if os.path.exists(ppd_path):
            return ppd_path


def getAllowableMIMETypes():
    """
        Scan all /etc/cups/*.convs files for allowable file formats.
    """
    files = glob.glob("/etc/cups/*.convs")

    allowable_mime_types = []

    for f in files:
        #log.debug( "Capturing allowable MIME types from: %s" % f )
        conv_file = file(f, 'r')

        for line in conv_file:
            if not line.startswith("#") and len(line) > 1:
                try:
                    source, dest, cost, prog =  line.split()
                except ValueError:
                    continue

                if source not in ('application/octet-stream', 'application/vnd.cups-postscript'):
                    allowable_mime_types.append(source)

    # Add some well-known MIME types that may not appear in the .convs files
    allowable_mime_types.append("image/x-bmp")
    allowable_mime_types.append("text/cpp")

    return allowable_mime_types
    
def getPPDDescription(f):
    if f.endswith('.gz'):
        nickname = gzip.GzipFile(f, 'r').read(4096)
    else:
        nickname = file(f, 'r').read(4096)
    
    try:
        desc = nickname_pat.search(nickname).group(1)
    except AttributeError:
        desc = ''
        
    return desc


def getSystemPPDs():
    major, minor, patch = getVersionTuple()
    ppds = {} # {'ppd name' : 'desc', ...}

    if major == 1 and minor < 2:
        log.debug("(CUPS 1.1.x) Searching for PPDs in: %s" % sys_cfg.dirs.ppd)

        for f in utils.walkFiles(sys_cfg.dirs.ppd, pattern="HP*ppd*;hp*ppd*", abs_paths=True):
            desc = getPPDDescription(f)
            
            if 'foo2' not in desc:
                ppds[f] = desc
                log.debug("%s: %s" % (f, desc))

    else: # 1.2.x
        log.debug("(CUPS 1.2.x) Getting list of PPDs using CUPS_GET_PPDS...")
        ppd_dict = cupsext.getPPDList()
        cups_ppd_path = getPPDPath() # usually /usr/share/cups/model
        foomatic_ppd_path = sys_cfg.dirs.ppdbase # usually /usr/share/ppd

        if not foomatic_ppd_path or not os.path.exists(foomatic_ppd_path):
            foomatic_ppd_path = '/usr/share/ppd'

        log.debug("CUPS PPD base path = %s" % cups_ppd_path)
        log.debug("Foomatic PPD base path = %s" % foomatic_ppd_path)

        for ppd in ppd_dict:
            if 'hp-' in ppd.lower() or 'hp_' in ppd.lower() and \
                ppd_dict[ppd]['ppd-make'] == 'HP':
                
                desc = ppd_dict[ppd]['ppd-make-and-model']
                
                if 'foo2' not in desc:
                    # PPD files returned by CUPS_GET_PPDS (and by lpinfo -m)
                    # can be relative to /usr/share/ppd/ or to 
                    # /usr/share/cups/model/. Not sure why this is.
                    # Here we will try both and see which one it is...
                    path = os.path.join(foomatic_ppd_path, ppd)
                    
                    if not os.path.exists(path):
                        path = os.path.join(cups_ppd_path, ppd)
                        
                        if not os.path.exists(path):
                            path = ppd # foomatic: or some other driver
    
                    ppds[path] = desc
                    log.debug("%s: %s" % (path, desc))

    return ppds


def levenshtein_distance(a,b):
    """
    Calculates the Levenshtein distance between a and b.
    Written by Magnus Lie Hetland.
    """
    n, m = len(a), len(b)
    if n > m:
        a,b = b,a
        n,m = m,n

    current = range(n+1)
    for i in range(1,m+1):
        previous, current = current, [i]+[0]*m
        for j in range(1,n+1):
            add, delete = previous[j]+1, current[j-1]+1
            change = previous[j-1]
            if a[j-1] != b[i-1]:
                change = change + 1
            current[j] = min(add, delete, change)

    return current[n]

number_pat = re.compile(r""".*?(\d+)""", re.IGNORECASE)

def getPPDFile(stripped_model, ppds):
    """
        Match up a model name to a PPD from a list of system PPD files.
    """
    log.debug("1st stage edit distance match")
    mins = {}
    eds = {}
    min_edit_distance = sys.maxint

    for f in ppds:
        t = os.path.basename(f).lower().replace('hp-', '').replace('-hpijs', '').\
            replace('.gz', '').replace('.ppd', '').replace('hp_', '').replace('_series', '').\
            replace('foomatic:', '').lower()

        eds[f] = levenshtein_distance(stripped_model, t)
        log.debug("dist('%s', '%s') = %d" % (stripped_model, t, eds[f]))
        min_edit_distance = min(min_edit_distance, eds[f])

    log.debug("Min. dist = %d" % min_edit_distance)

    for f in ppds:
        if eds[f] == min_edit_distance:
            for m in mins:
                if os.path.basename(m) == os.path.basename(f):
                    break # File already in list possibly with different path (Ubuntu, etc)
            else:
                mins[f] = ppds[f]

    log.debug(mins)

    if len(mins) > 1: # try pattern matching the model number
        log.debug("2nd stage matching with model number")

        try:
            model_number = number_pat.match(stripped_model).group(1)
            model_number = int(model_number)
        except AttributeError:
            pass
        except ValueError:
            pass
        else:
            log.debug("model_number=%d" % model_number)
            matches = {} #[]
            for x in range(3): # 1, 10, 100
                factor = 10**x
                log.debug("Factor = %d" % factor)
                adj_model_number = int(model_number/factor)*factor
                number_matching, match = 0, ''

                for m in mins:
                    try:
                        mins_model_number = number_pat.match(os.path.basename(m)).group(1)
                        mins_model_number = int(mins_model_number)
                        log.debug("mins_model_number= %d" % mins_model_number)
                    except AttributeError:
                        continue
                    except ValueError:
                        continue

                    mins_adj_model_number = int(mins_model_number/factor)*factor
                    log.debug("mins_adj_model_number=%d" % mins_adj_model_number)
                    log.debug("adj_model_number=%d" % adj_model_number)

                    if mins_adj_model_number == adj_model_number:
                        log.debug("match")
                        number_matching += 1
                        matches[m] = ppds[m]
                        log.debug(matches)

                    log.debug("***")

                if len(matches):
                    mins = matches
                    break

    return mins


#
# cupsext wrappers
#

def getDefaultPrinter():
    return cupsext.getDefaultPrinter()

def setDefaultPrinter(printer_name):
    return cupsext.setDefaultPrinter(printer_name)

def accept(printer_name):
    return controlPrinter(printer_name, CUPS_ACCEPT_JOBS)

def reject(printer_name):
    return controlPrinter(printer_name, CUPS_REJECT_JOBS)

def start(printer_name):
    return controlPrinter(printer_name, IPP_RESUME_PRINTER)

def stop(printer_name):
    return controlPrinter(printer_name, IPP_PAUSE_PRINTER)

def purge(printer_name):
    return controlPrinter(printer_name, IPP_PURGE_JOBS)

def controlPrinter(printer_name, cups_op):
    if cups_op in (CUPS_ACCEPT_JOBS, CUPS_REJECT_JOBS, IPP_PAUSE_PRINTER, IPP_RESUME_PRINTER, IPP_PURGE_JOBS):
        return cupsext.controlPrinter(printer_name, cups_op)

    return 0;

def openPPD(printer):
    if not printer:
        return

    return cupsext.openPPD(printer)

def closePPD():
    return cupsext.closePPD()

def getPPD(printer):
    if not printer:
        return

    return cupsext.getPPD(printer)

def getPPDOption(option):
    return cupsext.getPPDOption(option)

def getPPDPageSize():
    return cupsext.getPPDPageSize()

def getPrinters():
    return cupsext.getPrinters()

def getJobs(my_job=0, completed=0):
    return cupsext.getJobs(my_job, completed)

def getAllJobs(my_job=0):
    return cupsext.getJobs(my_job, 0) + cupsext.getJobs(my_job, 1)

def getVersion():
    return cupsext.getVersion()

def getVersionTuple():
    return cupsext.getVersionTuple()

def getServer():
    return cupsext.getServer()

def cancelJob(jobid, dest=None):
    if dest is not None:
        return cupsext.cancelJob(dest, jobid)
    else:
        jobs = cupsext.getJobs(0, 0)
        for j in jobs:
            if j.id == jobid:
                return cupsext.cancelJob(j.dest, jobid)

    return False

def resetOptions():
    return cupsext.resetOptions()

def addOption(option):
    return cupsext.addOption(option)

def getOptions():
    return cupsext.getOptions()

def printFile(printer, filename, title):
    if os.path.exists(filename):
        return cupsext.printFileWithOptions(printer, filename, title)
    else:
        return -1

def addPrinter(printer_name, device_uri, location, ppd_file, model, info):
    log.debug("addPrinter('%s', '%s', '%s', '%s', '%s', '%s')" %
        ( printer_name, device_uri, location, ppd_file, model, info))

    if ppd_file and not os.path.exists(ppd_file):
        log.error("PPD file '%s' not found." % ppd_file)
        return (-1, "PPD file not found")

    return cupsext.addPrinter(printer_name, device_uri, location, ppd_file, model, info)

def delPrinter(printer_name):
    return cupsext.delPrinter(printer_name)

def getGroupList():
    return cupsext.getGroupList()

def getGroup(group):
    return cupsext.getGroup(group)

def getOptionList(group):
    return cupsext.getOptionList(group)

def getOption(group, option):
    return cupsext.getOption(group, option)

def getChoiceList(group, option):
    return cupsext.getChoiceList(group, option)

def getChoice(group, option, choice):
    return cupsext.getChoice(group, option, choice)

def setOptions():
    return cupsext.setOptions()

def removeOption(option):
    return cupsext.removeOption(option)

def setPasswordCallback(func):
    return cupsext.setPasswordCallback(func)
    
