import json
import uuid

import cv2
import numpy as np
from django.http import HttpResponse
from django.shortcuts import render
# Create your views here.
from django.views.decorators.csrf import csrf_exempt

PREFIX = 'media/'

SUPPORT_FILE_FORMAT = ['png', 'jpg', 'bmp', 'jpeg', 'jpe', 'dib', 'pbm', 'pgm', 'ppm', 'tiff', 'tif']


# 获取uuid图片名
def getImageName():
    return uuid.uuid1().__str__()


# 保存图片，并判断是否为合适的扩展名
def getImage(request):
    print(request.FILES)
    file = request.FILES.get('image')
    suffix = file.name[file.name.rfind('.') + 1:].lower()
    if suffix not in SUPPORT_FILE_FORMAT:
        return ''
    filename = getImageName() + '.' + suffix
    img = open(PREFIX + filename, 'wb+')
    for chunk in file.chunks():
        img.write(chunk)
    img.close()
    return filename


# 接收图片，转发到getImage
@csrf_exempt
def upload(request):
    imageName = getImage(request)
    if imageName == '':
        return HttpResponse('Not supported image format')
    return HttpResponse(imageName)


def process_bg():
    img = np.zeros((800, 800, 3), np.uint8)
    filename = getImageName() + '.jpg'
    cv2.imwrite(PREFIX + filename, img)
    return filename


def process_line(para):
    name, start, end, color, thickness = para['img'], para['start'], para['end'], para['color'], para['thickness']
    img = cv2.imread(PREFIX + name)
    cv2.line(img, tuple(start), tuple(end), tuple(color), thickness)
    cv2.imwrite(PREFIX + name, img)
    return name


def process_rectangle(para):
    name, start, end, color, thickness = para['img'], para['start'], para['end'], para['color'], para['thickness']
    img = cv2.imread(PREFIX + name)
    cv2.rectangle(img, tuple(start), tuple(end), tuple(color), thickness)
    cv2.imwrite(PREFIX + name, img)
    return name


def process_circle(para):
    name, center, radius, color, thickness = para['img'], para['center'], para['radius'], para['color'], para[
        'thickness']
    img = cv2.imread(PREFIX + name)
    cv2.circle(img, tuple(center), radius, tuple(color), thickness)
    cv2.imwrite(PREFIX + name, img)
    return name


def process_ellipse(para):
    name, center, axes, angle, startangle, endangle, color, thickness = para['img'], para['center'], para['axes'], para[
        'angle'], para['startangle'], para['endangle'], para['color'], para['thickness']
    img = cv2.imread(PREFIX + name)
    cv2.ellipse(img, tuple(center), tuple(axes), angle, startangle, endangle, tuple(color), thickness)
    cv2.imwrite(PREFIX + name, img)
    return name


def process_polylines(para):
    name, point, isclosed, color = para['img'], para['point'], para['isclosed'], para['color']
    img = cv2.imread(PREFIX + name)
    pts = np.array(point, np.int32)
    pts = pts.reshape((-1, 1, 2))
    cv2.polylines(img, [pts], isclosed, tuple(color))
    cv2.imwrite(PREFIX + name, img)
    return name


def process_text(para):
    name, text, org, fontsize, color = para['img'], para['text'], para['org'], para['fontsize'], para['color']
    img = cv2.imread(PREFIX + name)
    cv2.putText(img, text, org, fontFace=cv2.FONT_HERSHEY_SCRIPT_COMPLEX, fontScale=fontsize, color=tuple(color))
    cv2.imwrite(PREFIX + name, img)
    return name


# 使用opencv 基本绘图
@csrf_exempt
def basic_drawing(request):
    if request.method == 'POST':
        para = json.loads(request.body)
        draw_type = para['type']
        if draw_type == 'bg':
            return HttpResponse(process_bg())
        else:
            if draw_type == 'line':
                return HttpResponse(process_line(para))
            elif draw_type == 'rectangle':
                return HttpResponse(process_rectangle(para))
            elif draw_type == 'circle':
                return HttpResponse(process_circle(para))
            elif draw_type == 'ellipse':
                return HttpResponse(process_ellipse(para))
            elif draw_type == 'polylines':
                return HttpResponse(process_polylines(para))
            elif draw_type == 'text':
                return HttpResponse(process_text(para))
    return HttpResponse('请使用POST方法')


@csrf_exempt
def rgb_color_space(request, color):
    if request.method == 'GET':
        image_name = request.GET.get('img')
        img = cv2.imread(PREFIX + image_name)
        data = None
        if color == 'r':
            data = img[:, :, 2]
        elif color == 'g':
            data = img[:, :, 1]
        elif color == 'b':
            data = img[:, :, 0]
        filename = color + '-' + image_name
        cv2.imwrite(PREFIX + filename, data)
        return HttpResponse(filename)
    return HttpResponse('请使用GET方法')


def r(request):
    return render(request, 'upload.html')