"""
Fixtures and setup / teardown functions

Tasks:
1. setup test database before starting the tests
2. delete test database after running the tests
"""

import os
import copy

import pytest


DB_NAME = 'bigchain_test_{}'.format(os.getpid())

CONFIG = {
    'database': {
        'name': DB_NAME
    },
    'keypair': {
        'private': '31Lb1ZGKTyHnmVK3LUMrAUrPNfd4sE2YyBt3UA4A25aA',
        'public': '4XYfCbabAWVUCbjTmRTFEu2sc3dFEdkse4r6X498B1s8'
    }
}

# Test user. inputs will be created for this user. Cryptography Keys
USER_PRIVATE_KEY = '8eJ8q9ZQpReWyQT5aFCiwtZ5wDZC4eDnCen88p3tQ6ie'
USER_PUBLIC_KEY = 'JEAkEJqLbbgDRAtMm8YAjGp759Aq2qTn9eaEHUj2XePE'


# We need this function to avoid loading an existing
# conf file located in the home of the user running
# the tests. If it's too aggressive we can change it
# later.
@pytest.fixture(scope='function', autouse=True)
def ignore_local_config_file(monkeypatch):
    def mock_file_config(filename=None):
        raise FileNotFoundError()

    monkeypatch.setattr('bigchaindb.config_utils.file_config', mock_file_config)


@pytest.fixture(scope='function', autouse=True)
def restore_config(request, node_config):
    from bigchaindb import config_utils
    config_utils.set_config(node_config)


@pytest.fixture(scope='module')
def node_config():
    return copy.deepcopy(CONFIG)


@pytest.fixture
def user_sk():
    return USER_PRIVATE_KEY


@pytest.fixture
def user_pk():
    return USER_PUBLIC_KEY


@pytest.fixture
def b(request, node_config):
    restore_config(request, node_config)
    from bigchaindb import Bigchain
    return Bigchain()


@pytest.fixture
def create_tx(b, user_pk):
    from bigchaindb.models import Transaction
    return Transaction.create([b.me], [([user_pk], 1)])


@pytest.fixture
def signed_create_tx(b, create_tx):
    return create_tx.sign([b.me_private])


@pytest.fixture
def signed_transfer_tx(signed_create_tx, user_pk, user_sk):
    from bigchaindb.models import Transaction
    inputs = signed_create_tx.to_inputs()
    tx = Transaction.transfer(inputs, [([user_pk], 1)], signed_create_tx.asset)
    return tx.sign([user_sk])