import sys
import cv2
import numpy as np
import math
from os.path import exists, basename
from common import image_resize, display, normalize_angle
from json import load

#clockwise from top left
order = [ 0, 2, 3, 5, 4, 1 ]
matchMethods = ['cv2.TM_CCOEFF', 'cv2.TM_CCOEFF_NORMED', 'cv2.TM_CCORR', 'cv2.TM_CCORR_NORMED', 'cv2.TM_SQDIFF', 'cv2.TM_SQDIFF_NORMED']

def read_text (textPath) :
	holePunches = {}
	with open(textPath) as json:
		holePunches = load(json)
	return holePunches

#
# CALIBRATE
#

if len(sys.argv) < 2:
	print('Please provide path of normalized scan to calibrate to')
	exit(1)

if len(sys.argv) < 3:
	print('Please provide path to output svg template')
	exit(2)

normalImage = sys.argv[-2]

if not exists(normalImage) :
	print('Normalized scan does not exist, please provide one that does')
	exit(2)

normalText = normalImage + '.json'

if not exists(normalText) :
	print('Corresponding normalized scan text does not exist, please generate one')
	exit(3)

outputTmpl = sys.argv[-1]

print(f'Calibrating to scan {basename(normalImage)}')

registrationMark = cv2.imread('./registrationMark.png', 0)
w, h = registrationMark.shape[:2]
holePunches = read_text(normalText)
original = cv2.imread(normalImage)
img = original.copy()
height, width = img.shape[:2]
orientation = height > width
marks = []

if not orientation :
	print(f'Scan is not in portrait mode, exiting...')
	exit(3)

print(holePunches)

def get_distance(ref, point):
	# print('ref: {} , point: {}'.format(ref, point))
	x1, y1 = ref[0], ref[1]
	x2, y2 = point[0], point[1]
	return math.hypot(x2 - x1, y2 - y1)

def group_points(points):
    groups = {}
    groupnum = 0
    while len(points) > 1:
        groupnum += 1
        key = str(groupnum)
        groups[key] = []
        ref = points.pop(0)
        for i, point in enumerate(points):
            d = get_distance(ref, point)
            if d < 30:
                groups[key].append(points[i])
                points[i] = None
        points = list(filter(lambda x: x is not None, points))
    return list([[int(np.mean(list([x[0] for x in groups[arr]]))), int(np.mean(list([x[1] for x in groups[arr]])))] for arr in groups])

def find_closest (pt, pts) :
	return pts[min(range(len(pts)), key = lambda i: get_distance(pts[i], pt))]

def find_in_half (half) :
	halfGray = cv2.cvtColor(half, cv2.COLOR_BGR2GRAY)
	res = cv2.matchTemplate(halfGray, registrationMark, cv2.TM_CCOEFF_NORMED)
	threshold = 0.7
	loc = np.where( res >= threshold)
	for pt in zip(*loc[::-1]):
		cv2.rectangle(half, pt, (pt[0] + w, pt[1] + h), (0,0,255), 2)
	return list(zip(*loc[::-1]))



ttly = holePunches['0']['y']-round(height*0.05)
ttlx = holePunches['0']['x']
topHalf = img[ttly:holePunches['1']['y']+round(height*0.1), ttlx:holePunches['2']['x']]
topHalfPts = find_in_half(topHalf)
thpts = group_points(topHalfPts)
for pt in thpts :
	#print(f'{ttlx + pt[0]},{ttly + pt[1]}')
	marks.append((ttlx + pt[0], ttly + pt[1],))

print(f'Found {len(thpts)} points')
#display(topHalf)

btly = holePunches['4']['y']-round(height*0.1)
btlx = holePunches['3']['x']
bottomHalf = img[btly:holePunches['5']['y']+round(height*0.05), btlx:holePunches['4']['x']]
bottomHalfPts = find_in_half(bottomHalf)
bhpts = group_points(bottomHalfPts)
for pt in bhpts :
	#print(f'{btlx + pt[0]},{btly + pt[1]}')
	marks.append((btlx + pt[0], btly + pt[1], ))

print(f'Found {len(bhpts)} points')

if len(marks) != 16 :
	print(f'{len(marks)} != 16 marks')
	exit(1)

print(find_closest((0,0,), marks))
print(find_closest((width,0,), marks))

print(find_closest((0,height,), marks))
print(find_closest((width,height,), marks))