import os
import string
import subprocess
import re
import settings
import urllib.parse

from PIL import Image, ImageDraw, ImageFont
from django import forms
from django.conf import settings
from django.urls import reverse
from django.http import HttpResponse, HttpResponseRedirect
from django.shortcuts import get_object_or_404, render
from django.core.exceptions import ObjectDoesNotExist, MultipleObjectsReturned

import troggle.settings as settings
#import troggle.core.models as models
from troggle.core.models import Expedition, DataIssue
from troggle.core.models_caves import CaveSlug, Cave, CaveAndEntrance, QM, EntranceSlug, Entrance, Area, SurvexStation, GetCaveLookup
from troggle.core.forms import CaveForm, CaveAndEntranceFormSet, VersionControlCommentForm, EntranceForm, EntranceLetterForm
from troggle.helper import login_required_if_public

class MapLocations(object):
    p = [
        ("laser.0_7", "BNase", "Reference", "Bräuning Nase laser point"),
        ("226-96", "BZkn", "Reference", "Bräuning Zinken trig point"),
        ("vd1","VD1","Reference", "VD1 survey point"),
        ("laser.kt114_96","HSK","Reference", "Hinterer Schwarzmooskogel trig point"), 
        ("2000","Nipple","Reference", "Nipple (Weiße Warze)"),
        ("3000","VSK","Reference", "Vorderer Schwarzmooskogel summit"),
        ("topcamp", "OTC", "Reference", "Old Top Camp"),
        ("laser.0", "LSR0", "Reference", "Laser Point 0"),
        ("laser.0_1", "LSR1", "Reference", "Laser Point 0/1"),
        ("laser.0_3", "LSR3", "Reference", "Laser Point 0/3"),
        ("laser.0_5", "LSR5", "Reference", "Laser Point 0/5"),
        ("225-96", "BAlm", "Reference", "Bräuning Alm trig point")
    ]
    def points(self):
        for ent in Entrance.objects.all():
            if ent.best_station():
                try:
                    k = ent.caveandentrance_set.all()[0].cave
                except:
                    message = " ! Failed to get Cave linked to Entrance:{} from:{} best:{}".format(ent.name, ent.filename, ent.best_station())
                    DataIssue.objects.create(parser='entrances', message=message)
                    print(message)
                    raise
                try:
                    areaName = k.getArea().short_name
                except:
                    message = " ! Failed to get Area on cave '{}' linked to Entrance:{} from:{} best:{}".format(cave, ent.name, ent.filename, ent.best_station())
                    DataIssue.objects.create(parser='entrances', message=message)
                    print(message)
                    raise
                self.p.append((ent.best_station(), "%s-%s" % (areaName, str(ent)[5:]), ent.needs_surface_work(), str(ent)))
        return self.p

    def __str__(self):
        return "{} map locations".format(len(self.p))

def getCave(cave_id):
    '''Returns a cave object when given a cave name or number. It is used by views including cavehref, ent, and qm.
    
    TO DO: search GCavelookup first, which should raise a MultpleObjectsReturned exception if there
    are duplicates'''
    try:
        cave = Cave.objects.get(kataster_number=cave_id)
        return cave
    except Cave.MultipleObjectsReturned as ex:
        raise MultipleObjectsReturned("Duplicate kataster number")  from ex # propagate this up

    except Cave.DoesNotExist as ex:
        Gcavelookup = GetCaveLookup() # dictionary makes strings to Cave objects
        if cave_id in Gcavelookup:
            return Gcavelookup[cave_id] 
        else:
            raise ObjectDoesNotExist("No cave found with this identifier in any id field") from ex # propagate this up           
    except:
        raise ObjectDoesNotExist("No cave found with this identifier in any id field")

def pad5(x):
   return "0" * (5 -len(x.group(0))) + x.group(0) 
def padnumber(x):
   return re.sub("\d+", pad5, x)
def numericalcmp(x, y):
   return cmp(padnumber(x), padnumber(y))

def caveKey(x):
    """python3 function for sort. Done in a hurry.
    Note that cave kataster numbers are not always integers.
    This needs to be fixed make a decent sort order.
    """ 
    if not x.kataster_number:
        return "~"
    return x.kataster_number

def getnotablecaves():
    notablecaves = []
    for kataster_number in settings.NOTABLECAVESHREFS:
        try:
            cave = Cave.objects.get(kataster_number=kataster_number)
            notablecaves.append(cave)
        except:
            print(" ! FAILED to get only one cave per kataster_number OR invalid number for: "+kataster_number)
            caves = Cave.objects.all().filter(kataster_number=kataster_number)
            for c in caves:
                print(c.kataster_number, c.slug())
                if c.slug() != None:
                    notablecaves.append(c)
    return notablecaves


def caveindex(request):
    caves = Cave.objects.all()
    caves1623 = list(Cave.objects.filter(area__short_name = "1623"))
    caves1626 = list(Cave.objects.filter(area__short_name = "1626"))
    caves1623.sort(key=caveKey)
    caves1626.sort(key=caveKey)
    return render(request,'caveindex.html', {'caves1623': caves1623, 'caves1626': caves1626, 'notablecaves':getnotablecaves(), 'cavepage': True})

def cave3d(request, cave_id=''):
    try:
        cave = getCave(cave_id)
    except Cave.MultipleObjectsReturned: # entirely the wrong action, REPLACE with the right display
        caves = Cave.objects.filter(kataster_number=cave_id) 
        return render(request, 'svxcaveseveral.html', {'settings': settings, "caves":caves })
    
    survexfilename = settings.SURVEX_DATA + cave.survex_file
    threedfilename = settings.THREEDCACHEDIR + '%s.3d' % cave_id
    if True or os.path.getmtime(survexfilename) > os.path.getmtime(threedfilename):
        subprocess.call(["cavern", "--output=%s" % threedfilename, survexfilename])
    test_file = open(threedfilename, 'rb')
    response = HttpResponse(content=test_file, content_type='application/3d')#mimetype is replaced by content_type for django 1.7
    response['Content-Disposition'] = 'attachment; filename=%s.3d' % cave_id
    # response['X-Sendfile'] = "%s.3d" % cave_id
    # It's usually a good idea to set the 'Content-Length' header too.
    # You can also set any other required headers: Cache-Control, etc.
    return response

def cave(request, cave_id='', offical_name=''):
    try:
        cave=getCave(cave_id) 
    except MultipleObjectsReturned:
        caves = Cave.objects.filter(kataster_number=cave_id) 
        return render(request, 'svxcaveseveral.html', {'settings': settings, "caves":caves }) # not the right template, needs a specific one
    except ObjectDoesNotExist:
        return render(request, 'svxcavesingle404.html', {'settings': settings, "cave":cave_id })
    except:
        return render(request, 'svxcavesingle404.html', {'settings': settings })

    if cave.non_public and settings.PUBLIC_SITE and not request.user.is_authenticated():
        return render(request, 'nonpublic.html', {'instance': cave, 'cavepage': True, 'cave_id': cave_id})
    else:
        return render(request,'cave.html', {'settings': settings, 'cave': cave, 'cavepage': True, 'cave_id': cave_id})

def caveEntrance(request, slug):
    cave = Cave.objects.get(caveslug__slug = slug)
    if cave.non_public and settings.PUBLIC_SITE and not request.user.is_authenticated():
        return render(request,'nonpublic.html', {'instance': cave})
    else:
        return render(request,'cave_entrances.html', {'cave': cave})

def caveDescription(request, slug):
    cave = Cave.objects.get(caveslug__slug = slug)
    if cave.non_public and settings.PUBLIC_SITE and not request.user.is_authenticated():
        return render(request,'nonpublic.html', {'instance': cave})
    else:
        return render(request,'cave_uground_description.html', {'cave': cave})

def caveQMs(request, slug):
    cave = Cave.objects.get(caveslug__slug = slug)
    if cave.non_public and settings.PUBLIC_SITE and not request.user.is_authenticated():
        return render(request,'nonpublic.html', {'instance': cave})
    else:
        return render(request,'cave_qms.html', {'cave': cave})
def caveLogbook(request, slug):
    cave = Cave.objects.get(caveslug__slug = slug)
    if cave.non_public and settings.PUBLIC_SITE and not request.user.is_authenticated():
        return render(request,'nonpublic.html', {'instance': cave})
    else:
        return render(request,'cave_logbook.html', {'cave': cave})

def caveSlug(request, slug):
    cave = Cave.objects.get(caveslug__slug = slug)
    if cave.non_public and settings.PUBLIC_SITE and not request.user.is_authenticated():
        return render(request,'nonpublic.html', {'instance': cave, 'cave_editable': slug})
    else:
        return render(request,'cave.html', {'cave': cave, 'cave_editable': slug})

@login_required_if_public
def edit_cave(request, slug=None):
    if  slug is not None:
        cave = Cave.objects.get(caveslug__slug = slug)
    else:
        cave = Cave()
    if request.POST:
        form = CaveForm(request.POST, instance=cave)
        ceFormSet = CaveAndEntranceFormSet(request.POST)
        versionControlForm = VersionControlCommentForm(request.POST)
        if form.is_valid() and ceFormSet.is_valid() and versionControlForm.is_valid():
            cave = form.save(commit = False)
            if slug is None:
                for a in form.cleaned_data["area"]:
                    if a.kat_area():
                        myArea = a.kat_area()
                if form.cleaned_data["kataster_number"]:
                    myslug =  "%s-%s" % (myArea, form.cleaned_data["kataster_number"])
                else:
                    myslug =  "%s-%s" % (myArea, form.cleaned_data["unofficial_number"])
            else:
                myslug = slug
            cave.filename = myslug + ".html"
            cave.save()
            form.save_m2m()
            if slug is None:
              cs = CaveSlug(cave = cave, slug = myslug, primary = True)
              cs.save()
            ceinsts = ceFormSet.save(commit=False)
            for ceinst in ceinsts:
                ceinst.cave = cave
                ceinst.save()
            cave.writeDataFile()
            return HttpResponseRedirect("/" + cave.url)    
    else:
        form = CaveForm(instance=cave)
        ceFormSet = CaveAndEntranceFormSet(queryset=cave.caveandentrance_set.all())
        versionControlForm = VersionControlCommentForm()
        
    return render(request, 
                               'editcave2.html', 
                               {'form': form,
                                'caveAndEntranceFormSet': ceFormSet,
                                'versionControlForm': versionControlForm
                                })

@login_required_if_public
def editEntrance(request, caveslug, slug=None):
    cave = Cave.objects.get(caveslug__slug = caveslug) 
    if  slug is not None:
        entrance = Entrance.objects.get(entranceslug__slug = slug)
    else:
        entrance = Entrance()
    if request.POST:
        form = EntranceForm(request.POST, instance = entrance)
        versionControlForm = VersionControlCommentForm(request.POST)
        if slug is None:
            entletter = EntranceLetterForm(request.POST)
        else:
            entletter = None
        if form.is_valid() and versionControlForm.is_valid() and (slug is not None or entletter.is_valid()):
            entrance = form.save(commit = False)
            if slug is None:
                slugname = cave.slug() + entletter.cleaned_data["entrance_letter"]
                entrance.cached_primary_slug = slugname
                entrance.filename = slugname + ".html"
            entrance.save()
            if slug is None:
                es = EntranceSlug(entrance = entrance, slug = slugname, primary = True)
                es.save()
                el = entletter.save(commit = False)
                el.cave = cave
                el.entrance = entrance
                el.save()
            entrance.writeDataFile()
            return HttpResponseRedirect("/" + cave.url) 
    else:
        form = EntranceForm(instance = entrance)
        versionControlForm = VersionControlCommentForm()
        if slug is None:
            entletter = EntranceLetterForm(request.POST)
        else:
            entletter = None
    return render(request, 
                               'editentrance.html', 
                               {'form': form,
                                'versionControlForm': versionControlForm,
                                'entletter': entletter
                                })

def qm(request,cave_id,qm_id,year,grade=None):
    year=int(year)
    try:
        qm=getCave(cave_id).get_QMs().get(number=qm_id,found_by__date__year=year) 
        return render(request,'qm.html',locals())
    except Cave.MultipleObjectsReturned: # entirely the wrong action, REPLACE with the right display
        caves = Cave.objects.filter(kataster_number=cave_id) 
        return render(request, 'svxcaveseveral.html', {'settings': settings, "caves":caves })

    except QM.DoesNotExist:
        url=urllib.parse.urljoin(settings.URL_ROOT, r'/admin/core/qm/add/'+'?'+  r'number=' + qm_id)
        if grade:
            url += r'&grade=' + grade
        return HttpResponseRedirect(url)

def ent(request, cave_id, ent_letter):
    cave = Cave.objects.filter(kataster_number = cave_id)[0]
    cave_and_ent = CaveAndEntrance.objects.filter(cave = cave).filter(entrance_letter = ent_letter)[0]
    return render(request,'entrance.html', {'cave': cave,
                                                'entrance': cave_and_ent.entrance,
                                                'letter': cave_and_ent.entrance_letter,})

def entranceSlug(request, slug):
    entrance = Entrance.objects.get(entranceslug__slug = slug)
    if entrance.non_public and not request.user.is_authenticated():
        return render(request,'nonpublic.html', {'instance': entrance})
    else:
        return render(request,'entranceslug.html', {'entrance': entrance})

def surveyindex(request):
    surveys=Survey.objects.all()
    expeditions=Expedition.objects.order_by("-year")
    return render(request,'survey.html',locals())

# def cave_description(request, cavedescription_name):
    # cave_description = get_object_or_404(CaveDescription, short_name = cavedescription_name)
    # return render(request,'cave_description.html', locals())

def get_entrances(request, caveslug):
    cave = Cave.objects.get(caveslug__slug = caveslug)
    return render(request,'options.html', {"items": [(e.entrance.slug(), e.entrance.slug()) for e in cave.entrances()]})

def get_qms(request, caveslug):
    cave = Cave.objects.get(caveslug__slug = caveslug)
    return render(request,'options.html', {"items": [(e.entrance.slug(), e.entrance.slug()) for e in cave.entrances()]})

areanames = [
	#('',     'Location unclear'),
	('1a',   '1a – Plateau: around Top Camp'),
	('1b',   '1b – Western plateau near 182'),
	('1c',   '1c – Eastern plateau near 204 walk-in path'),
	('1d',   '1d – Further plateau around 76'),
	('2a',   '2a – Southern Schwarzmooskogel near 201 path and the Nipple'),
	('2b',   '2b – Eishöhle area'),
	('2b or 4 (unclear)', '2b or 4 (unclear)'),
	('2c',   '2c – Kaninchenhöhle area'),
	('2d',   '2d – Steinbrückenhöhle area'),
	('3',    '3 – Bräuning Alm'),
	('4',	'4 – Kratzer valley'),
	('5',	'5 – Schwarzmoos-Wildensee'),
	('6',	'6 – Far plateau'),
	('1626 or 6 (borderline)', '1626 or 6 (borderline)'),
	('7',	'7 – Egglgrube'),
	('8a',	'8a – Loser south face'),
	('8b',	'8b – Loser below Dimmelwand'),
	('8c',	'8c – Augst See'),
	('8d',	'8d – Loser-Hochganger ridge'),
	('9',	'9 – Gschwandt Alm'),
	('10',	'10 – Altaussee'),
	('11',	'11 – Augstbach')
	]


def prospecting(request):
    #for key, name in areanames:
    #    print key, Area.objects.get(short_name = key)
    areas = []
    for key, name in areanames:
        a = Area.objects.get(short_name = key)
        caves = list(a.cave_set.all())
        caves.sort(key=caveKey)
        areas.append((name, a, caves))
    return render(request, 'prospecting.html', {"areas": areas})
    
# Parameters for big map and zoomed subarea maps:
# big map first (zoom factor ignored)

maps = {
# id	left		top			right		bottom		zoom
#		G&K			G&K			G&K			G&K			factor
"all": [33810.4,	85436.5,	38192.0,		81048.2,	0.35,
		"All"],
"40":  [36275.6,	82392.5,	36780.3,	81800.0,	3.0,
		"Eishöhle"],
"76":  [35440.0,	83220.0,	36090.0,	82670.0,	1.3,
		"Eislufthöhle"],
"204": [36354.1,	84154.5,	37047.4,	83300,	3.0,
		"Steinbrückenhöhle"],
"tc":  [35230.0,	82690.0,	36110.0,	82100.0,	3.0,
		"Near Top Camp"],
"grieß":
       [36000.0,	86300.0,	38320.0,	84400.0,	4.0,
		"Grießkogel Area"],
}

for n in list(maps.keys()):
    L, T, R, B, S, name = maps[n]
    W = (R-L)/2
    H = (T-B)/2
    for i in range(2):
        for j in range(2):
            maps["%s%i%i" % (n, i, j)] = [L + i * W, T - j * H, L + (i + 1) * W, T - (j + 1) * H, S, name]
# Keys in the order in which we want the maps output
mapcodes = ["all", "grieß","40", "76", "204", "tc"] 
# Field codes
L = 0
T = 1
R = 2
B = 3
ZOOM = 4
DESC = 5

areacolours = {
	'1a' : '#00ffff',
	'1b' : '#ff00ff',
	'1c' : '#ffff00',
	'1d' : '#ffffff',
	'2a' : '#ff0000',
	'2b' : '#00ff00',
	'2c' : '#008800',
	'2d' : '#ff9900',
	'3'  : '#880000',
	'4'  : '#0000ff',
	'6'  : '#000000', # doubles for surface fixed pts, and anything else
	'7'  : '#808080'
	}

for FONT in [
		"/usr/share/fonts/truetype/freefont/FreeSans.ttf",
		"/usr/X11R6/lib/X11/fonts/truetype/arial.ttf",
		"/mnt/c/windows/fonts/arial.ttf",
		"C:\WINNT\Fonts\ARIAL.TTF"
		]:
	if os.path.isfile(FONT): break
TEXTSIZE = 16
CIRCLESIZE =8
LINEWIDTH = 2
myFont = ImageFont.truetype(FONT, TEXTSIZE)

def mungecoord(x, y, mapcode, img):
	# Top of Zinken is 73 1201 = dataset 34542 81967
	# Top of Hinter is 1073 562 = dataset 36670 83317
	# image is 1417 by 2201
	# FACTOR1 = 1000.0 / (36670.0-34542.0)
	# FACTOR2 = (1201.0-562.0) / (83317 - 81967)
	# FACTOR = (FACTOR1 + FACTOR2)/2 
	# The factors aren't the same as the scanned map's at a slight angle. I
	# can't be bothered to fix this.  Since we zero on the Hinter it makes
	# very little difference for caves in the areas round 76 or 204.
	# xoffset = (x - 36670)*FACTOR
	# yoffset = (y - 83317)*FACTOR
	# return (1073 + xoffset, 562 - yoffset)

	m = maps[mapcode]
	factorX, factorY = img.size[0] / (m[R] - m[L]), img.size[1] / (m[T] - m[B])
	return ((x - m[L]) * factorX, (m[T] - y) * factorY)
	
COL_TYPES = {True: "red",
             False: "#dddddd",
             "Reference": "#dddddd"}
	
def plot(surveypoint, number,  point_type, label, mapcode, draw, img):
    try:
        ss = SurvexStation.objects.lookup(surveypoint)
        E, N = ss.x, ss.y
        shortnumber = number.replace("—","")
        (x,y) = list(map(int, mungecoord(E, N, mapcode, img)))
        #imgmaps[maparea].append( [x-4, y-SIZE/2, x+4+draw.textsize(shortnumber)[0], y+SIZE/2, shortnumber, label] )
        draw.rectangle([(x+CIRCLESIZE, y-TEXTSIZE/2), (x+CIRCLESIZE*2+draw.textsize(shortnumber)[0], y+TEXTSIZE/2)], fill="#ffffff")
        draw.text((x+CIRCLESIZE * 1.5,y-TEXTSIZE/2), shortnumber, fill="#000000")
        draw.ellipse([(x-CIRCLESIZE,y-CIRCLESIZE),(x+CIRCLESIZE,y+CIRCLESIZE)], fill=COL_TYPES[point_type], outline="#000000")
    except:
        pass

def prospecting_image(request, name):
    # We should replace all this with something that exports an overlay for Google Maps and OpenStreetView
    mainImage = Image.open(os.path.join(settings.SURVEY_SCANS, "location_maps", "pguidemap.jpg"))
    if settings.PUBLIC_SITE and not request.user.is_authenticated():
        mainImage = Image.new("RGB", mainImage.size, '#ffffff')
    m = maps[name]
    #imgmaps = []
    if name == "all":
        img = mainImage
    else:
        M = maps['all']
        W, H = mainImage.size
        l = int((m[L] - M[L]) / (M[R] - M[L]) * W)
        t = int((m[T] - M[T]) / (M[B] - M[T]) * H)
        r = int((m[R] - M[L]) / (M[R] - M[L]) * W)
        b = int((m[B] - M[T]) / (M[B] - M[T]) * H)
        img = mainImage.crop((l, t, r, b))
        w = int(round(m[ZOOM] * (m[R] - m[L]) / (M[R] - M[L]) * W))
        h = int(round(m[ZOOM] * (m[B] - m[T]) / (M[B] - M[T]) * H))
        img = img.resize((w, h), Image.BICUBIC)
    draw = ImageDraw.Draw(img)
    draw.setfont(myFont)
    if name == "all":
        for maparea in list(maps.keys()):
            if maparea == "all":
                continue
            localm = maps[maparea]
            l,t = mungecoord(localm[L], localm[T], "all", img)
            r,b = mungecoord(localm[R], localm[B], "all", img)
            text = maparea + " map"
            textlen = draw.textsize(text)[0] + 3
            draw.rectangle([l, t, l+textlen, t+TEXTSIZE+2], fill='#ffffff')
            draw.text((l+2, t+1), text, fill="#000000")
            #imgmaps.append( [l, t, l+textlen, t+SIZE+2, "submap" + maparea, maparea + " subarea map"] )
            draw.line([l, t, r, t], fill='#777777', width=LINEWIDTH)
            draw.line([l, b, r, b], fill='#777777', width=LINEWIDTH)
            draw.line([l, t, l, b], fill='#777777', width=LINEWIDTH)
            draw.line([r, t, r, b], fill='#777777', width=LINEWIDTH)
            draw.line([l, t, l+textlen, t], fill='#777777', width=LINEWIDTH)
            draw.line([l, t+TEXTSIZE+2, l+textlen, t+TEXTSIZE+2], fill='#777777', width=LINEWIDTH)
            draw.line([l, t, l, t+TEXTSIZE+2], fill='#777777', width=LINEWIDTH)
            draw.line([l+textlen, t, l+textlen, t+TEXTSIZE+2], fill='#777777', width=LINEWIDTH)
    #imgmaps[maparea] = []
    # Draw scale bar
    m100 = int(100 / (m[R] - m[L]) * img.size[0])
    draw.line([10, TEXTSIZE*3, 10, TEXTSIZE*2], fill='#000000', width=LINEWIDTH)
    draw.line([10, TEXTSIZE*2, 10+m100, TEXTSIZE*2], fill='#000000', width=LINEWIDTH)
    draw.line([10+m100, TEXTSIZE * 3, 10+m100, TEXTSIZE*2], fill='#000000', width=LINEWIDTH)
    label = "100m"
    draw.text([10 + (m100 - draw.textsize(label)[0]) / 2, TEXTSIZE/2], label, fill='#000000')

    for p in MapLocations.points():
        surveypoint, number,  point_type, label = p
        plot(surveypoint, number,  point_type, label, name, draw, img)

    for (N, E, D, num) in [(35975.37,    83018.21,    100,"177"),    # Calculated from bearings
                           (35350.00,    81630.00,    50,    "71"),    # From Auer map
                           (36025.00,    82475.00,    50,    "146"),    # From mystery map
                           (35600.00,    82050.00,    50,    "35"),    # From Auer map
                           (35650.00,    82025.00,    50,    "44"),    # From Auer map
                           (36200.00,    82925.00,    50,    "178"),    # Calculated from bearings
                           (35232.64,    82910.37,    25,    "181"),    # Calculated from bearings
                           (35323.60,    81357.83,    50,    "74")    # From Auer map
                           ]:
        (N,E,D) = list(map(float, (N, E, D)))
        maparea = Cave.objects.get(kataster_number = num).getArea().short_name
        lo = mungecoord(N-D, E+D, name, img)
        hi = mungecoord(N+D, E-D, name, img)
        lpos = mungecoord(N-D, E, name, img)
        draw.ellipse([lo,hi], outline="#000000")
        draw.ellipse([lo[0]+1, lo[1]+1, hi[0]-1, hi[1]-1], outline=areacolours[maparea])
        draw.ellipse([lo[0]+2, lo[1]+2, hi[0]-2, hi[1]-2], outline=areacolours[maparea])
        draw.rectangle([lpos[0],lpos[1]-TEXTSIZE/2, lpos[0] + draw.textsize(name)[0], lpos[1]+TEXTSIZE/2], fill="#ffffff")
        draw.text((lpos[0], lpos[1]-TEXTSIZE/2), num, fill="#000000")
    response = HttpResponse(content_type = "image/png")
    del draw
    img.save(response, "PNG")
    return response