# encoding: utf-8
import click
import logging

import ckan.model as model

from typing import Any, Mapping

from ckan.plugins import toolkit


log = logging.getLogger(__name__)


_banner = """
****** Welcome to the CKAN shell ******

This session has some variables pre-populated:
  - app (CKAN Application object)
  - config (CKAN config dictionary)
  - model (CKAN model module to access the Database)
  - toolkit (CKAN toolkit module)
    """


def ipython(namespace: Mapping[str, Any], banner: str) -> None:
    import IPython
    from traitlets.config.loader import Config

    c = Config()
    c.TerminalInteractiveShell.banner2 = banner

    IPython.start_ipython([], user_ns=namespace, config=c)


def python(namespace: Mapping[str, Any], banner: str) -> None:
    import code
    code.interact(banner=banner, local=namespace)


@click.command()
@click.help_option("-h", "--help")
@click.pass_context
def shell(ctx: click.Context):
    """Run an interactive IPython shell with the context of the
    CKAN instance.

    It will try to use IPython, if not installed it will callback
    to the default Python's shell.
    """

    namespace = {
        "app": ctx.obj.app._wsgi_app,
        "model": model,
        "config": ctx.obj.config,
        "toolkit": toolkit,
    }

    try:
        ipython(namespace, _banner)
    except ImportError:
        log.debug("`ipython` library is missing. Using default python shell.")
        python(namespace, _banner)
