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import json
from pathlib import Path
from typing import Mapping

from .base import Repository, Version

__all__ = [
    'core',
    'linux',
    'cask',
]

def parse_cached(cached: Path) -> Mapping[str, Version]:
    with cached.open('r') as json_file:
        formulae = json.load(json_file)
    result = dict()
    for formula in formulae:
        if 'full_name' in formula:
            name = formula['full_name']
        elif 'full_token' in formula:
            name = formula['full_token']
        else:
            print('no name', formula)
            raise ValueError()
        if 'version' in formula:
            version = formula['version']
        elif 'versions' in formula:
            versions = formula['versions']
            if 'stable' in versions:
                version = versions['stable']
            else:
                print('no stable versions', versions)
                raise ValueError()
        else:
            print('no versions??', formula)
            raise ValueError()
        result[name] = Version(version, version)
    return result

def build_repo(name: str, url: str) -> Repository:
    url = f'https://formulae.brew.sh/api/{url}.json'
    return Repository(
        family='Homebrew',
        repo=name,
        index_url=url,
        parse=parse_cached,
    )

core = build_repo('Core', 'formula')
linux = build_repo('Linux', 'formula-linux')
cask = build_repo('Cask', 'cask')