import shutil
import tempfile
import sys
import unittest
import os
import json

from io import StringIO
from lib.storage import WalletStorage, FINAL_SEED_VERSION

from . import SequentialTestCase


class FakeSynchronizer(object):

    def __init__(self):
        self.store = []

    def add(self, address):
        self.store.append(address)


class WalletTestCase(SequentialTestCase):

    def setUp(self):
        super(WalletTestCase, self).setUp()
        self.user_dir = tempfile.mkdtemp()

        self.wallet_path = os.path.join(self.user_dir, "somewallet")

        self._saved_stdout = sys.stdout
        self._stdout_buffer = StringIO()
        sys.stdout = self._stdout_buffer

    def tearDown(self):
        super(WalletTestCase, self).tearDown()
        shutil.rmtree(self.user_dir)
        # Restore the "real" stdout
        sys.stdout = self._saved_stdout


class TestWalletStorage(WalletTestCase):

    def test_read_dictionary_from_file(self):

        some_dict = {"a":"b", "c":"d"}
        contents = json.dumps(some_dict)
        with open(self.wallet_path, "w") as f:
            contents = f.write(contents)

        storage = WalletStorage(self.wallet_path, manual_upgrades=True)
        self.assertEqual("b", storage.get("a"))
        self.assertEqual("d", storage.get("c"))

    def test_write_dictionary_to_file(self):

        storage = WalletStorage(self.wallet_path)

        some_dict = {
            u"a": u"b",
            u"c": u"d",
            u"seed_version": FINAL_SEED_VERSION}

        for key, value in some_dict.items():
            storage.put(key, value)
        storage.write()

        contents = ""
        with open(self.wallet_path, "r") as f:
            contents = f.read()
        self.assertEqual(some_dict, json.loads(contents))