from urllib import request
from io import TextIOWrapper
from itertools import groupby
import re
import json
from meta_release import SourceMetaRelease, MetaRelease


RELEASE_WORD_MATCHER = r'(^\Origin\:\s|Label:\s|Suite:\s|Version:\s|Codename:\s|Date:\s|Architecture:\s|Components:\s|Description\:\s|MD5Sum:\s)'

class Release:
    def __init__(self, distro_codename):
        # example url:http://old-releases.ubuntu.com/ubuntu/dists/hoary/Release
		# example distro_codename = 'hoary'
        self.distro_codename = distro_codename
        self.meta_release = self.changelog_release_file()

    def changelog_release_file(self):
        meta_release = SourceMetaRelease().meta_release_parse()
        return meta_release

    def distro_release_file_urls(self):
        meta_release_objects = []

        for d in self.meta_release:
            meta_release_obj = MetaRelease(d)
            dist_and_release_file_url = { meta_release_obj.dist, meta_release_obj.release_file }
            print(type(dist_and_release_file_url))
            meta_release_objects.append(dist_and_release_file_url)

        return meta_release_objects

    def release_file_parse(self, release_file_url):
        """ Returns the meta_release_file parsed as a list of dicts """
        with request.urlopen(f'{release_file_url}') as response:
            index_counter = 0
            lines = TextIOWrapper(response, encoding='utf-8')
            stripped_lines = [
                    re.split(RELEASE_WORD_MATCHER, l.strip()) for l in
                    lines ]
            print(stripped_lines)
            grouped_lines = [list(group) for key, group in
                    groupby(stripped_lines, lambda x: x == []) if not key]
            list_of_dicts = []

            for group in grouped_lines:
                d = {}
                # list of each group
                for arr in group:
                    arr_per_group = len(group)
                    k = arr[0].lower().replace(":", "").strip()
                    v = arr[1].strip()

                    # this builds up our dict by adding one k,v pair per key
                    d[f"{k}"] = v

                    list_of_dicts.append(d) if arr_per_group == len(d.keys()) else None 

            return list_of_dicts

if __name__ == '__main__':
    # testing

    r = Release('focal')
    release_file_urls = r.distro_release_file_urls()

    for meta_release in release_file_urls:
        print(meta_release)
        #keys = meta_release.keys()
        #for distro in keys:
        #    url = meta_release[distro]
        #    print(url)