#    Copyright (C) 2013 Hewlett-Packard Development Company, L.P.
#
#    Author: Juerg Haefliger <juerg.haefliger@hp.com>
#
#    Based on test_handler_set_hostname.py
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License version 3, as
#    published by the Free Software Foundation.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

from cloudinit.config import cc_seed_random

import base64
import gzip
import tempfile

from StringIO import StringIO

from cloudinit import cloud
from cloudinit import distros
from cloudinit import helpers
from cloudinit import util

from cloudinit.sources import DataSourceNone

from tests.unittests import helpers as t_help

import logging

LOG = logging.getLogger(__name__)


class TestRandomSeed(t_help.TestCase):
    def setUp(self):
        super(TestRandomSeed, self).setUp()
        self._seed_file = tempfile.mktemp()

    def tearDown(self):
        util.del_file(self._seed_file)

    def _compress(self, text):
        contents = StringIO()
        gz_fh = gzip.GzipFile(mode='wb', fileobj=contents)
        gz_fh.write(text)
        gz_fh.close()
        return contents.getvalue()

    def _get_cloud(self, distro, metadata=None):
        paths = helpers.Paths({})
        cls = distros.fetch(distro)
        ubuntu_distro = cls(distro, {}, paths)
        ds = DataSourceNone.DataSourceNone({}, ubuntu_distro, paths)
        if metadata:
            ds.metadata = metadata
        return cloud.Cloud(ds, paths, {}, ubuntu_distro, None)

    def test_append_random(self):
        cfg = {
            'random_seed': {
                'file': self._seed_file,
                'data': 'tiny-tim-was-here',
            }
        }
        cc_seed_random.handle('test', cfg, self._get_cloud('ubuntu'), LOG, [])
        contents = util.load_file(self._seed_file)
        self.assertEquals("tiny-tim-was-here", contents)

    def test_append_random_unknown_encoding(self):
        data = self._compress("tiny-toe")
        cfg = {
            'random_seed': {
                'file': self._seed_file,
                'data': data,
                'encoding': 'special_encoding',
            }
        }
        self.assertRaises(IOError, cc_seed_random.handle, 'test', cfg,
                          self._get_cloud('ubuntu'), LOG, [])

    def test_append_random_gzip(self):
        data = self._compress("tiny-toe")
        cfg = {
            'random_seed': {
                'file': self._seed_file,
                'data': data,
                'encoding': 'gzip',
            }
        }
        cc_seed_random.handle('test', cfg, self._get_cloud('ubuntu'), LOG, [])
        contents = util.load_file(self._seed_file)
        self.assertEquals("tiny-toe", contents)

    def test_append_random_gz(self):
        data = self._compress("big-toe")
        cfg = {
            'random_seed': {
                'file': self._seed_file,
                'data': data,
                'encoding': 'gz',
            }
        }
        cc_seed_random.handle('test', cfg, self._get_cloud('ubuntu'), LOG, [])
        contents = util.load_file(self._seed_file)
        self.assertEquals("big-toe", contents)

    def test_append_random_base64(self):
        data = base64.b64encode('bubbles')
        cfg = {
            'random_seed': {
                'file': self._seed_file,
                'data': data,
                'encoding': 'base64',
            }
        }
        cc_seed_random.handle('test', cfg, self._get_cloud('ubuntu'), LOG, [])
        contents = util.load_file(self._seed_file)
        self.assertEquals("bubbles", contents)

    def test_append_random_b64(self):
        data = base64.b64encode('kit-kat')
        cfg = {
            'random_seed': {
                'file': self._seed_file,
                'data': data,
                'encoding': 'b64',
            }
        }
        cc_seed_random.handle('test', cfg, self._get_cloud('ubuntu'), LOG, [])
        contents = util.load_file(self._seed_file)
        self.assertEquals("kit-kat", contents)

    def test_append_random_metadata(self):
        cfg = {
            'random_seed': {
                'file': self._seed_file,
                'data': 'tiny-tim-was-here',
            }
        }
        c = self._get_cloud('ubuntu', {'random_seed': '-so-was-josh'})
        cc_seed_random.handle('test', cfg, c, LOG, [])
        contents = util.load_file(self._seed_file)
        self.assertEquals('tiny-tim-was-here-so-was-josh', contents)