import os
import string
import re
#import settings
import urllib.parse
# from pathlib import Path
from PIL import Image, ImageDraw, ImageFont

from django.http import HttpResponse
from django.shortcuts import render
# from django.core.exceptions import ObjectDoesNotExist, MultipleObjectsReturned

import troggle.settings as settings
from troggle.core.models.caves import Entrance, Area, SurvexStation, Cave
from troggle.core.views.caves import caveKey

''' Generates the prospecting guide document.
'''

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))

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) # assumes unique
        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.EXPOFILES, "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