import os

import re


def forge_package_version():
    git_rev = os.popen('git describe --tags').read().strip()  # type: str

    groups = re.match(r'^((\d+).(\d+)(.\d+)?)(-(\d+)-([0-9A-Za-z]+))?$', git_rev).groups()
    major = int(groups[1])
    minor = int(groups[2])
    patch = int(groups[3]) if groups[3] is not None else 0
    pre = int(groups[5]) if groups[4] is not None else None
    rev = groups[6] or ''
    sub = ''

    if pre is not None:
        if patch == 0:
            minor += 1
        else:
            patch += 1
        git_branch = os.popen('git branch | grep \*').read().strip()  # type: str
        git_branch = git_branch.replace('* ', '')

        if git_branch == 'master':  # preview release
            pre_type = 'pr'
        elif git_branch == 'develop':  # beta release
            pre_type = 'b'
        else:  # alpha release
            pre_type = 'a'
        sub = '%s%s-%s' % (pre_type, pre, rev)

    return '%s.%s.%s%s' % (major, minor, patch, sub)


print(forge_package_version())