import os
import tarfile

from flask import request, make_response, send_file

from data.database import configure
from util.config.validator import EXTRA_CA_DIRECTORY

from config_app.c_app import app, config_provider
from config_app.config_endpoints.api import resource, ApiResource, nickname

@resource('/v1/configapp/tarconfig')
class TarConfigLoader(ApiResource):
    """
    Resource for dealing with configuration as a tarball,
    including loading and generating functions
    """

    @nickname('scGetConfigTarball')
    def get(self):
        config_path = config_provider.config_volume

        # remove the initial trailing / from the prefix path, and add the last dir one
        tar_dir_prefix = config_path[1:] + '/'

        def tarinfo_filter(tarinfo):
            # remove leading directory info
            tarinfo.name = tarinfo.name.replace(tar_dir_prefix, '')

            # ignore any directory that isn't the specified extra ca one:
            if tarinfo.isdir() and not tarinfo.name == EXTRA_CA_DIRECTORY:
                return None

            return tarinfo

        # Remove the tar if it already exists so we don't write on top of existing tarball
        if os.path.isfile('quay-config.tar.gz'):
            os.remove('quay-config.tar.gz')

        tar = tarfile.open('quay-config.tar.gz', mode="w|gz")

        for name in os.listdir(config_path):
            tar.add(os.path.join(config_path, name), filter=tarinfo_filter)

        tar.close()

        return send_file('quay-config.tar.gz', mimetype='application/gzip')

    @nickname('scUploadTarballConfig')
    def put(self):
        """ Loads tarball config into the config provider """
        input_stream = request.stream
        with tarfile.open(mode="r|gz", fileobj=input_stream) as tar_stream:
            # TODO: find a way to remove the contents of the directory on shutdown?
            tar_stream.extractall(config_provider.config_volume)

        # now try to connect to the db provided in their config
        combined = dict(**app.config)
        combined.update(config_provider.get_config())

        configure(combined)

        return make_response('OK')