from __future__ import absolute_import

import os
import re
from typing import List, Type

from clwpos.php.base import PHP


def create_generic_php(alt_php_identifier: str, root_path=None, base_cls = None):
    if root_path is None:
        # create alt versions by default
        php_root_dir = f'/opt/{alt_php_identifier.replace("-", "/")}/'
    else:
        php_root_dir = root_path

    base_cls = base_cls if base_cls else PHP
    return base_cls(
        identifier=alt_php_identifier,
        version=f'{alt_php_identifier[-2]}.{alt_php_identifier[-1]}',
        modules_dir=os.path.join(php_root_dir, 'usr/lib64/php/modules/'),
        dir=php_root_dir,
        bin=os.path.join(php_root_dir, 'usr/bin/php'),
        ini=os.path.join(php_root_dir, 'link/conf/default.ini')
    )


def get_alt_php_versions() -> List[PHP]:
    """
    Get list of installed alt-php versions.
    """
    alt_dir = '/opt/alt'
    pattern = re.compile(r'^php\d{2}$')
    alt_php_versions = [
        create_generic_php(f'alt-{dirname}') for dirname in os.listdir(alt_dir)
        if pattern.match(dirname)
    ]
    return alt_php_versions