import asyncio
import tempfile as tfile
from datetime import datetime
from urllib.request import urlopen

import requests
from keras.utils import img_to_array
from lxml import etree
import keras

from keras.applications.imagenet_utils import decode_predictions, preprocess_input
from keras.models import Model
from PIL import Image
from io import BytesIO

import numpy as np

from sklearn.decomposition import PCA
from scipy.spatial import distance
from collections import OrderedDict

# from remove import remove_files
#
# from generate_csv_file import generate_csv_files
# from load_data import load_data, get_shops
from schemas import Shop


def get_ids_from_feed(feed_url):
    # create temp xml file
    temp_file = tfile.NamedTemporaryFile(mode="w", suffix=".xml", prefix="feed")

    f = temp_file.name

    temp_file.write(urlopen(feed_url).read().decode('utf-8'))

    # open xml file
    tree = etree.parse(f)

    temp_file.close()

    root = tree.getroot()

    # get image ids and shop base url
    list_ids = []

    shop_url = root[0][1].text

    for item in root.findall(".//g:mpn", root.nsmap):
        list_ids.append(item.text)

    return list_ids, shop_url


def get_image(url):
    res = requests.get(url)
    im = Image.open(BytesIO(res.content)).convert("RGB").resize((224, 224))
    img = img_to_array(im)
    x = img_to_array(img)
    x = np.expand_dims(x, axis=0)
    x = preprocess_input(x)
    return img, x


def load_image(url, img_id):
    print('get image url', id)
    request_url = '{}/flat_thumb/{}/1/224'.format(url, img_id)
    print('get image', request_url)
    img, x = get_image(request_url)
    return img, x


async def create_feature_files(shop: Shop):
    model = keras.applications.VGG16(weights='imagenet', include_top=True)
    feat_extractor = Model(inputs=model.input, outputs=model.get_layer("fc2").output)
    await calculate_shop(shop, feat_extractor)


async def calculate_shop(shop: Shop, feat_extractor) -> None:
    start = datetime.today()
    if shop.id:  # temp
        print(shop.id, shop.base_url)
        google_xml_feed_url = '{}/google_xml_feed'.format(shop.base_url)
        try:
            list_ids, shop_url = get_ids_from_feed(google_xml_feed_url)
        except Exception as e:
            list_ids = []
            print('could not get images from ', shop.id, e)
        features = []

        list_of_fitted_designs = []

        design_json = {}
        if len(list_ids) > 0:
            for l in list_ids[:100]:

                try:
                    img, x = load_image(shop_url, l)
                    feat = feat_extractor.predict(x)[0]

                    features.append(feat)
                    list_of_fitted_designs.append(l)

                except Exception as e:
                    print(l, ' failed loading feature extraction', e)

            try:
                features = np.array(features)
                # print(features.shape)
                components = len(features) if len(features) < 300 else 300
                pca = PCA(n_components=components)  # 300
                pca.fit(features)
                pca_features = pca.transform(features)
            except Exception as e:
                print('pca too small?', e)

            if len(list_of_fitted_designs) >= 80:
                max_list_per_design = 80
            else:
                max_list_per_design = len(list_of_fitted_designs)

            try:
                for im in list_of_fitted_designs:

                    query_image_idx = list_of_fitted_designs.index(im)

                    similar_idx = [distance.cosine(pca_features[query_image_idx], feat) for feat in pca_features]

                    filterd_idx = dict()

                    for i in range(len(similar_idx)):
                        filterd_idx[i] = {"dist": similar_idx[i], "id": list_of_fitted_designs[i]}

                    sorted_dict = dict(
                        OrderedDict(sorted(filterd_idx.items(), key=lambda i: i[1]['dist'])[1:max_list_per_design]))

                    design_list = []

                    for k, v in sorted_dict.items():
                        design_list.append(v)

                    design_dict = {"shop_id": shop.id, "design": im,
                                   "results": design_list
                                   }

                    print(design_dict)
                    try:
                        response = requests.post(shop.webhook_url, json=design_dict)
                        if response.status_code == 200:
                            print(f"result for {im} is sent to {shop.webhook_url}")
                        else:
                            print(f"Error sending data {shop.webhook_url} to for result {im}: {response.status_code}")
                    except Exception as e:
                        print(f"Error sending data {shop.webhook_url} to for result {im}: {response.status_code}", e)

                    # idx_closest = sorted(range(len(similar_idx)), key=lambda k: similar_idx[k])

                    # design_json.update(design_dict)
                    # print(idx_closest)

            except Exception as e:
                print("could not create json with look-a-like for shop:", shop.id, e)

        end = datetime.today()

        # return {'shop_id': shop.id, 'start_time': start, 'end_time': end, 'designs': design_json}