import yaml
import os

from glob import glob
from slugify import slugify
from .util import pushd


class ConfigException(Exception):
    pass


class BaseConfig(object):
    def __getitem__(self, name):
        return self._data[name]

    def __contains__(self, name):
        return name in self._data

    def __str__(self):
        return yaml.dump(self._data, default_flow_style=False)


class ChildConfig(BaseConfig):
    def __init__(self, config, path):
        self.path = path
        self.config = config
        self.id = slugify(path, max_length=255)
        self.name = os.path.splitext(os.path.basename(path))[0]
        if not os.path.exists(path):
            raise ConfigException("Repo config file not found: {}".format(path))

        with open(path) as f:
            self._data = yaml.load(f, Loader=yaml.SafeLoader) or {}

        self._data['name'] = self.name


class Config(BaseConfig):
    def __init__(self, path):
        self.path = os.path.join(path, 'pacman-repo.yml')
        if not os.path.exists(self.path):
            self.path = os.path.join(path, 'pacman-repo.yaml')
            if not os.path.exists(self.path):
                raise ConfigException("Base config file not found: {}".format(path))

        with open(self.path) as f:
            self._data = yaml.load(f, Loader=yaml.SafeLoader) or {}

        self.repos = []
        self.servers = []
        with pushd(path):
            for source in self["repos"]:
                for path in glob('{}/*.yml'.format(source)) + \
                        glob('{}/*.yaml'.format(source)):
                    self.repos.append(RepoConfig(self, path))

            for server in self["servers"]:
                for path in glob('{}/*.yml'.format(server)) + \
                        glob('{}/*.yaml'.format(server)):
                    self.servers.append(ServerConfig(self, path))


class RepoConfig(ChildConfig):
    pass


class ServerConfig(ChildConfig):
    pass