import os
import json
import sys
import tempfile
from unittest import skipIf
from twisted.trial import unittest
from lbrynet import conf
from lbrynet.core.Error import InvalidCurrencyError


class SettingsTest(unittest.TestCase):
    def setUp(self):
        os.environ['LBRY_TEST'] = 'test_string'

    def tearDown(self):
        del os.environ['LBRY_TEST']

    @staticmethod
    def get_mock_config_instance():
        settings = {'test': (str, '')}
        env = conf.Env(**settings)
        return conf.Config({}, settings, environment=env)

    def test_envvar_is_read(self):
        settings = self.get_mock_config_instance()
        self.assertEqual('test_string', settings['test'])

    def test_setting_can_be_overridden(self):
        settings = self.get_mock_config_instance()
        settings['test'] = 'my_override'
        self.assertEqual('my_override', settings['test'])

    def test_setting_can_be_updated(self):
        settings = self.get_mock_config_instance()
        settings.update({'test': 'my_update'})
        self.assertEqual('my_update', settings['test'])

    def test_setting_is_in_dict(self):
        settings = self.get_mock_config_instance()
        setting_dict = settings.get_current_settings_dict()
        self.assertEqual({'test': 'test_string'}, setting_dict)

    def test_invalid_setting_raises_exception(self):
        settings = self.get_mock_config_instance()
        self.assertRaises(KeyError, settings.set, 'invalid_name', 123)

    def test_invalid_data_type_raises_exception(self):
        settings = self.get_mock_config_instance()
        self.assertIsNone(settings.set('test', 123))
        self.assertRaises(KeyError, settings.set, 'test', 123, ('fake_data_type',))

    def test_setting_precedence(self):
        settings = self.get_mock_config_instance()
        settings.set('test', 'cli_test_string', data_types=(conf.TYPE_CLI,))
        self.assertEqual('cli_test_string', settings['test'])
        settings.set('test', 'this_should_not_take_precedence', data_types=(conf.TYPE_ENV,))
        self.assertEqual('cli_test_string', settings['test'])
        settings.set('test', 'runtime_takes_precedence', data_types=(conf.TYPE_RUNTIME,))
        self.assertEqual('runtime_takes_precedence', settings['test'])

    def test_max_key_fee_set(self):
        fixed_default = {'CURRENCIES':{'BTC':{'type':'crypto'}}}
        adjustable_settings = {'max_key_fee': (json.loads, {'currency':'USD', 'amount':1})}
        env = conf.Env(**adjustable_settings)
        settings = conf.Config(fixed_default, adjustable_settings, environment=env)

        with self.assertRaises(InvalidCurrencyError):
            settings.set('max_key_fee', {'currency':'USD', 'amount':1})

        valid_setting = {'currency':'BTC', 'amount':1}
        settings.set('max_key_fee', valid_setting)
        out = settings.get('max_key_fee')
        self.assertEqual(out, valid_setting)


    def test_data_dir(self):
        # check if these directories are returned as string and not unicode
        # otherwise there will be problems when calling os.path.join on
        # unicode directory names with string file names
        self.assertEqual(str, type(conf.default_download_dir))
        self.assertEqual(str, type(conf.default_data_dir))
        self.assertEqual(str, type(conf.default_lbryum_dir))

    @skipIf('win' in sys.platform, 'fix me!')
    def test_load_save_config_file(self):
        # setup settings
        adjustable_settings = {'data_dir': (str, conf.default_data_dir),
                'lbryum_servers': (list, [])}
        env = conf.Env(**adjustable_settings)
        settings = conf.Config({}, adjustable_settings, environment=env)
        conf.settings = settings
        # setup tempfile
        conf_entry = b"lbryum_servers: ['localhost:50001', 'localhost:50002']\n"
        with tempfile.NamedTemporaryFile(suffix='.yml') as conf_file:
            conf_file.write(conf_entry)
            conf_file.seek(0)
            conf.conf_file = conf_file.name
            # load and save settings from conf file
            settings.load_conf_file_settings()
            settings.save_conf_file_settings()
            # test if overwritten entry equals original entry
            # use decoded versions, because format might change without
            # changing the interpretation
            decoder = conf.settings_decoders['.yml']
            conf_decoded = decoder(conf_entry)
            conf_entry_new = conf_file.read()
            conf_decoded_new = decoder(conf_entry_new)
            self.assertEqual(conf_decoded, conf_decoded_new)