"""TODO."""

import importlib
import os
import sys
import tarfile
from urllib.parse import urlparse

import boto3


def _load_remote_project_archive(project_zip_path, project_name):
    """Load the S3 archive into the local fs and insert it into the path."""
    project_folder = '/tmp/{0!s}'.format(project_name)
    print('Using project folder: ', project_folder)
    if not os.path.isdir(project_folder):
        result = urlparse(project_zip_path)
        remote_bucket = result.netloc
        remote_file = result.path.strip('/')
        print('Locating archive in s3: ', remote_bucket, remote_file)
        s3 = boto3.Session().resource('s3')
        archive_on_s3 = s3.Object(remote_bucket, remote_file).get()
        with tarfile.open(fileobj=archive_on_s3['Body'], mode='r|gz') as t:
            t.extractall(project_folder)
    sys.path.insert(0, project_folder)
    print('Using path: ', sys.path)
    os.chdir(project_folder)


def lambda_handler(event, context):
    """Entry point. Loads settings from deployed zappa_settings.py."""
    zappa_settings = importlib.import_module('zappa_settings')
    _load_remote_project_archive(
        zappa_settings.ARCHIVE_PATH,
        zappa_settings.PROJECT_NAME
    )
    from index import handler
    return handler(event, context)