# Copyright 2011 Corentin Chary <corentin.chary@gmail.com>
# Copyright 2020-2023 src_prepare group
# Distributed under the terms of the GNU General Public License v2

import json
import re
import urllib.error
import urllib.parse
import urllib.request

import portage

from euscan import helpers, mangling, output

HANDLER_NAME = "github"
CONFIDENCE = 100
PRIORITY = 90


def can_handle(pkg, url=None):
    return url and url.startswith("mirror://github/")


def guess_package(cp, url):
    match = re.search("^mirror://github/(.*?)/(.*?)/(.*)$", url)

    assert match
    return (match.group(1), match.group(2), match.group(3))


def scan_url(pkg, url, options):
    "http://developer.github.com/v3/repos/downloads/"

    user, project, filename = guess_package(pkg.cpv, url)

    # find out where version is expected to be found
    cp, ver, rev = portage.pkgsplit(pkg.cpv)
    if ver not in filename:
        return

    # now create a filename-matching regexp
    # XXX: supposedly replace first with (?P<foo>...)
    # and remaining ones with (?P=foo)
    fnre = re.compile("^%s$" % re.escape(filename).replace(re.escape(ver), "(.*?)"))

    output.einfo(
        "Using github API for: project=%s user=%s filename=%s"
        % (project, user, filename)
    )

    dlreq = urllib.request.urlopen(
        "https://api.github.com/repos/%s/%s/downloads" % (user, project)
    )
    dls = json.load(dlreq)

    ret = []
    for dl in dls:
        m = fnre.match(dl["name"])

        if m:
            pv = mangling.mangle_version(m.group(1), options)
            if helpers.version_filtered(cp, ver, pv):
                continue

            url = mangling.mangle_url(dl["html_url"], options)
            ret.append((url, pv, HANDLER_NAME, CONFIDENCE))
    return ret