# encoding: utf-8

import cv2 as cv
import numpy as np
import math

#裁剪图片
def cutImage(img_addr):
    img = cv.imread(img_addr)
    img_arr = np.array(img)
    hight = img_arr.shape[0]
    wight = img_arr.shape[1]
    dest_img = img_arr[hight/2+20:hight,wight/2:wight,:]

    return dest_img


def cmpPicWithRGB(picPath1,picPath2):
    std_img = cutImage(picPath1)

    test_img = cutImage(picPath2)

    width = std_img.shape[0]
    hight = test_img.shape[1]

    std_B, std_G, std_R = cv.split(std_img)
    test_B, test_G, test_R = cv.split(std_img)

    sum_std_B = 0
    sum_std_G = 0
    sum_std_R = 0
    for x in range(0,width,1):
        for y in range(0,hight,1):
            sum_std_B = sum_std_B + std_B[x][y]
            sum_std_G = sum_std_G + std_G[x][y]
            sum_std_R = sum_std_R + std_R[x][y]
    avg_std_B = sum_std_B / (width*hight)
    avg_std_G = sum_std_G / (width*hight)
    avg_std_R = sum_std_R / (width*hight)
    for x in range(0,width,1):
        for y in range(0,hight,1):
            if abs(test_B[x][y] - avg_std_B) >10 or abs(test_G[x][y] - avg_std_G) > 10 or abs(test_R[x][y] - avg_std_R[x][y] > 10):
                print test_B[x][y]
                print test_G[x][y]
                print test_R[x][y]
                print avg_std_B
                print avg_std_R
                print avg_std_G
                return False
            else:
                return True

class RGBColor():
    def __init__(self):
        pass

    '''
    BGR颜色差值小于offset值时，定性为灰阶色调。
    '''
    def isGray(self, bgr, offset = 10):
        # print "RGB isGray:", bgr,abs(bgr[0] - bgr[1])
        if abs(bgr[0] - bgr[1]) < offset \
                and abs(bgr[1] - bgr[2]) < offset\
                and abs(bgr[2] - bgr[0]) < offset:
            return True
        else:
            return False

    '''
    传入的图片对象，必须是BGR颜色空间。
    根据BGR颜色值，判断是否为纯色图片。同时忽略极少的噪点干扰。
    :param img:传入的图片对象， BGR颜色空间
    :param expTh: 颜色平均值偏差范围，> expTh 则是False。
    :return: [判断结果True/False,颜色值]
    '''
    def isSingleColor(self, img, expTh=0.01, splitCount=10):
        height, width, color = img.shape
        heightStep = height/splitCount
        widthStep = width/splitCount
        totalAvg = self.getAvgBGR(img)
        expCount = 0.0
        for heightCount in range(0,splitCount):
            for widthCount in range(0, splitCount):
                height0 = heightStep*heightCount
                width0 = widthStep*widthCount
                height1 = height0+heightStep
                width1 = width0+widthStep
                scaleAvg = self.getAvgBGR(img[height0:height1, width0:width1])
                ret = self.isColorSimilar(totalAvg, scaleAvg, faultTolerance=40)
                if ret is False:
                    expCount += 1
        expRate = expCount/(splitCount*splitCount)
        print "isSingleColor,expRate:",expRate,expCount
        if expRate > expTh:
            return False, totalAvg
        else:
            return True, totalAvg

    def getAvgBGR(self, img):
        imgB = img[:,:,0]
        imgG = img[:,:,1]
        imgR = img[:,:,2]

        avgB = np.average(imgB)
        avgG = np.average(imgG)
        avgR = np.average(imgR)
        return avgB,avgG,avgR

    def getMaxBGR(self, img):
        imgB = img[:, :, 0]
        imgG = img[:, :, 1]
        imgR = img[:, :, 2]

        maxB = np.max(imgB)
        maxG = np.max(imgG)
        maxR = np.max(imgR)
        return maxB, maxG, maxR

    '''
    判断一张图片是否是纯黑图片。
    :param img:需要判断的图片
    :param grayTH : 黑色判断的灰阶阈值
    :param splitCount: 图片拆分的行列次数
    :param expTh：黑色计算的容错区域比例。> expTh 则是False。
    '''
    def isBlack(self, img, grayTH = 70,splitCount=10, expTh = 0.01):
        height, width, color = img.shape
        heightStep = height / splitCount
        widthStep = width / splitCount
        totalAvg = self.getAvgBGR(img)
        expCount = 0.0
        for heightCount in range(0, splitCount):
            for widthCount in range(0, splitCount):
                height0 = heightStep * heightCount
                width0 = widthStep * widthCount
                height1 = height0 + heightStep
                width1 = width0 + widthStep
                scaleAvg = self.getAvgBGR(img[height0:height1, width0:width1])
                ret = self.isGray(scaleAvg)
                #print "rgb isBlack,gray ret:", ret
                if ret is False or scaleAvg[1] > grayTH:
                    expCount += 1
        expRate = expCount / (splitCount * splitCount)
        print "isBlack,expRate:", expRate, expCount
        if expRate > expTh:
            return False
        else:
            return True


    '''
            # 描述：bgr色差计算。ΔE=( ΔL^2 + ΔA^2 + ΔB^2 ) ^ (1/2) ΔE
            # 参数：color1、color2: bgr格式
            # 返回值：
            #   相差值，越小越相近。
            #   0~50(微小色差)，感觉极微；
            #   50~150(小色差)，感觉轻微；
            #   150~300(较小色差)，感觉明显；
            #   300~600(较大色差)，感觉很明显；
            #   600以上(大色差)，感觉强烈。
            # '''

    def colorDistance(self, color1, color2):
        b1, g1, r1 = color1
        b2, g2, r2 = color2
        rmean = (r1 + r2) / 2
        R = int(r1) - int(r2)
        G = int(g1) - int(g2)
        B = int(b1) - int(b2)
        return math.sqrt((2 + rmean / 256) * (R ** 2) + 4 * (G ** 2) + (2 + (255 - rmean) / 256) * (B ** 2))

    '''
        # 描述：颜色是否相近。
        # 参数：
        #   color1、color2: bgr格式
        #   faultTolerance: 容错值大小，表示两颜色的色差值
        # 返回值：<= faultTolerance返回True,否则返回False.
        #
        # '''

    def isColorSimilar(self, color1, color2, faultTolerance=100):
        if 0:
            b1 = color1[0] in range(color2[0] - faultTolerance, color2[0] + faultTolerance)
            b2 = color1[1] in range(color2[1] - faultTolerance, color2[1] + faultTolerance)
            b3 = color1[2] in range(color2[2] - faultTolerance, color2[2] + faultTolerance)

            if b1 == True and b2 == True and b3 == True:
                return True
            else:
                return False
        if 1:
            val = self.colorDistance(color1, color2)
            return True if val <= faultTolerance else False