#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
 #the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

""" This is the Kibble git utility plugin """

import os
import sys
import subprocess
import re

def defaultBranch(source, datapath, KibbleBit = None):
    """ Tries to figure out what the main branch of a repo is """
    wanted_branches = ['main', 'master', 'trunk']
    branch = ""
    # If we have an override of branches we like, use 'em
    if KibbleBit and KibbleBit.config.get('git'):
        wanted_branches = KibbleBit.config['git'].get('wanted_branches', wanted_branches)
    foundBranch = False
    
    # For each wanted branch, in order, look for it in our clone,
    # and return the name if found.
    for B in wanted_branches:
        try:
            branch = subprocess.check_output('cd %s && git rev-parse --abbrev-ref %s' % (datapath, B),  shell = True, stderr=subprocess.DEVNULL).decode('ascii', 'replace').strip().strip("* ")
            return branch
        except:
            pass
    # If we couldn't find it locally, looking at all (local+remote)
    try:
        inp = subprocess.check_output("cd %s && git branch -a | awk -F ' +' '! /\(no branch\)/ {print $2}'" % datapath,  shell = True, stderr=subprocess.DEVNULL).decode('ascii', 'replace').split()
        if len(inp) > 0:
            for b in sorted(inp):
                if b.find("detached") == -1:
                    branch = str(b.replace("remotes/origin/", "", 1))
                    for B in wanted_branches:
                        if branch == B:
                            return branch
    except:
        pass

    # If still not found, resort to whatever branch comes first in the remote listing...
    inp = subprocess.check_output("cd %s && git ls-remote --heads %s" % (datapath, source['sourceURL']),  shell = True, stderr=subprocess.DEVNULL).decode('ascii', 'replace').split()
    if len(inp) > 0:
        for remote in inp:
            m = re.match(r"[a-f0-9]+\s+refs/heads/(?:remotes/)?(.+)", remote)
            if m:
                branch = m.group(1)
                return branch
    # Give up
    return ""