# scrape.py
import argparse
import base64
import json
from pathlib import Path

from bs4 import BeautifulSoup
import requests


def scrape(url, format_, type_):
    try:
        page = requests.get(url)
    except requests.RequestException as err:
        print(str(err))
    else:
        soup = BeautifulSoup(page.content, 'html.parser')
        images = fetch_images(soup, url)
        images = filter_images(images, type_)
        save(images, format_)


def fetch_images(soup, base_url):
    # Works only with relative src paths.
    images = []
    for img in soup.findAll('img'):
        src = img.get('src')
        img_url = f'{base_url}/{src}'
        name = img_url.split('/')[-1]
        images.append(dict(name=name, url=img_url))
    return images


def filter_images(images, type_):
    if type_ == 'all':
        return images
    ext_map = {
        'png': ['.png'],
        'jpg': ['.jpg', '.jpeg'],
    }
    return [
        img for img in images
        if matches_extension(img['name'], ext_map[type_])
    ]


def matches_extension(filename, extension_list):
    extension = Path(filename.lower()).suffix
    return extension in extension_list


def save(images, format_):
    if images:
        if format_ == 'img':
            save_images(images)
        else:
            save_json(images)
        print('Done')
    else:
        print('No images to save.')


def save_images(images):
    for img in images:
        img_data = requests.get(img['url']).content
        with open(img['name'], 'wb') as f:
            f.write(img_data)


def save_json(images):
    data = {}
    for img in images:
        img_data = requests.get(img['url']).content
        b64_img_data = base64.b64encode(img_data)
        str_img_data = b64_img_data.decode('utf-8')
        data[img['name']] = str_img_data

    with open('images.json', 'w') as ijson:
        ijson.write(json.dumps(data))


if __name__ == "__main__":

    parser = argparse.ArgumentParser(
        description='Scrape a webpage.')
    parser.add_argument(
        '-t',
        '--type',
        choices=['all', 'png', 'jpg'],
        default='all',
        help='The image type we want to scrape.')

    parser.add_argument(
        '-f',
        '--format',
        choices=['img', 'json'],
        default='img',
        help='The format images are saved to.')

    parser.add_argument(
        'url',
        help='The URL we want to scrape for images.')

    args = parser.parse_args()
    scrape(args.url, args.format, args.type)