import base64
import os
import random
import string
import tempfile
from typing import Tuple, Any, Generator

import pytest
from flask import Flask
from flask.testing import FlaskClient, FlaskCliRunner
from werkzeug.test import Client

from corvus import create_app, register_blueprints, register_error_handlers
from corvus.db import init_db
from corvus.model import User
from corvus.service import user_service


def add_test_user() -> Tuple[str, str]:
    test_username = 'test_' + ''.join(
        random.choices(string.ascii_letters + string.digits, k=17)).strip()
    test_password = ''.join(
        random.choices(string.ascii_letters + string.digits, k=32)).strip()
    user_service.register(test_username, test_password, User.ROLE_ADMIN, False)
    return test_username, test_password


@pytest.fixture
def app() -> Generator[Flask, Any, Any]:
    """Create and configure a new corvus_app instance for each test."""
    # create a temporary file to isolate the database for each test
    db_fd, db_path = tempfile.mkstemp(suffix='.db')
    test_database_uri = 'sqlite:///{}'.format(db_path)
    # create the corvus_app with common test config
    corvus_app = create_app({
        'TESTING': True,
        'SQLALCHEMY_DATABASE_URI': test_database_uri,
    })
    register_blueprints(corvus_app)
    register_error_handlers(corvus_app)

    # create the database and load test data
    with corvus_app.app_context():
        init_db()
        test_username, test_password = add_test_user()
        corvus_app.config['test_username'] = test_username
        corvus_app.config['test_password'] = test_password
        # get_db().executescript(_data_sql)

    yield corvus_app

    # close and remove the temporary database
    os.close(db_fd)
    os.unlink(db_path)


@pytest.fixture
def client(app: Flask) -> FlaskClient:
    """A test client for the app."""
    return app.test_client()


@pytest.fixture
def runner(app: Flask) -> FlaskCliRunner:
    """A test runner for the app's Click commands."""
    return app.test_cli_runner()


class AuthActions(object):
    def __init__(self,
                 client: Client,
                 username: str = "",
                 password: str = "") -> None:
        self._client = client
        self.username: str = username
        self.password: str = password
        self.token: str = ""

    def configure(self, username: str, password: str) -> Any:
        self.username = username
        self.password = password
        return self

    def login(self) -> Any:
        auth_header = self.get_authorization_header_basic()
        result = self._client.post(
            '/auth/login',
            headers={
                auth_header[0]: auth_header[1]
            }
        )
        self.token = result.json['token']
        return result

    def bump(self) -> Any:
        auth_header = self.get_authorization_header_token()
        return self._client.post(
            '/auth/bump',
            headers={
                auth_header[0]: auth_header[1]
            }
        )

    def logout(self) -> Any:
        auth_header = self.get_authorization_header_token()
        return self._client.post(
            '/auth/logout',
            headers={
                auth_header[0]: auth_header[1]
            }
        )

    def get_authorization_header_basic(self) -> Tuple[str, str]:
        credentials = base64.b64encode(
            '{}:{}'.format(self.username, self.password).encode('utf8')) \
            .decode('utf8').strip()
        return 'Authorization', 'Basic {}'.format(credentials)

    def get_authorization_header_token(self) -> Tuple[str, str]:
        credentials = base64.b64encode(
            '{}:{}'.format(self.username, self.token).encode('utf8')) \
            .decode('utf8').strip()
        return 'X-Auth-Token', '{}'.format(credentials)


@pytest.fixture
def auth(client: Client) -> AuthActions:
    return AuthActions(client,
                       client.application.config.get('test_username'),
                       client.application.config.get('test_password'))