import httplib2
import re
import argparse
import os.path
from collections import Counter
from bs4 import BeautifulSoup

if __name__ == '__main__':
    parser = argparse.ArgumentParser(description="Dig out links from a website.")
    parser.add_argument('site', type=str, help="Website that you want to scrape for links.")
    parser.add_argument('-f', '--filter', type=str, default=r'..*$',
                        help="Only return file names matching this regular expression.")
    parser.add_argument('-s', '--summary', action='store_true', help="Print summary and quit.")
    parser.add_argument('-d', '--debug', action='store_true', help="Print out debugging information.")
    parser.add_argument('-r', '--save-report', action='store_true',
                        help='Save report of all the original links to a file.')
    
    args = parser.parse_args()
    
    # todo: save in tmp
    h = httplib2.Http('.cache')
    response, content = h.request(args.site)
    
    s = BeautifulSoup(content, features='html.parser')
    
    # if args.debug:
    #     print(s.prettify())

    links = s.find_all(href=re.compile(args.filter))
    if not links or links == 0:
        exit("No file names found with the given filter.")
    if args.summary:
        # grab only the extension from splitext
        extensions = []
        has_jpeg = False
        for link in links:
            filename, extension = os.path.splitext(link['href'])
            if extension:
                if extension == '.jpeg':
                    has_jpeg = True
                extensions.append(extension)
            if args.debug:
                print(f'Original: {link}, splitext[0]: {filename}, splitext[1]: {extension}')
        # todo: merge jpeg and jpg into one extension (display as: xxx jpg (yyy as jpeg))
        print(f'URL: {args.site}')
        print(f'Total file names: {len(links)}')
        print('File types:')
        # todo: in the counts of extensions mention varying capitalisation
        extension_count = Counter(extensions)
        if has_jpeg:
            
        for extension, count in extension_count.items():
            # do not print the first character (dot) of extension
            if not has_jpeg:
                print(f'{count}\t{extension[1:]}')
            else:
                if extension == '.jpg' or extension == '.jpeg':
                    print(f"{count}\t{extension[1:]} (with some as .jpeg")
        exit(0)
    # we got to the end, print out all the links
    link_list = [f'{args.site}{link["href"]}' for link in links]
    for link in link_list:
        print(f"{link}")
    if args.save_report:
        with open(args.save_report, 'w') as file:
            # todo: create summary object that will be printed with --summary or saved to file with --save-summary
            print(link_list, file=file)