import os
from typing import List, Dict
import streamlit.components.v1 as components

# Create a _RELEASE constant. We'll set this to False while we're developing
# the component, and True when we're ready to package and distribute it.
# (This is, of course, optional - there are innumerable ways to manage your
# release process.)
_RELEASE = True

# Declare a Streamlit component. `declare_component` returns a function
# that is used to create instances of the component. We're naming this
# function "_component_func", with an underscore prefix, because we don't want
# to expose it directly to users. Instead, we will create a custom wrapper
# function, below, that will serve as our component's public API.

# It's worth noting that this call to `declare_component` is the
# *only thing* you need to do to create the binding between Streamlit and
# your component frontend. Everything else we do in this file is simply a
# best practice.

if not _RELEASE:
    _component_func = components.declare_component(
        # We give the component a simple, descriptive name ("my_component"
        # does not fit this bill, so please choose something better for your
        # own component :)
        "draggable_list",
        # Pass `url` here to tell Streamlit that the component will be served
        # by the local dev server that you run via `npm run start`.
        # (This is useful while your component is in development.)
        url="http://localhost:3001",
    )
else:
    # When we're distributing a production version of the component, we'll
    # replace the `url` param with `path`, and point it to to the component's
    # build directory:
    parent_dir = os.path.dirname(os.path.abspath(__file__))
    build_dir = os.path.join(parent_dir, "frontend/build")
    _component_func = components.declare_component("draggable_list", path=build_dir)


# Create a wrapper function for the component. This is an optional
# best practice - we could simply expose the component function returned by
# `declare_component` and call it done. The wrapper allows us to customize
# our component's API: we can pre-process its input args, post-process its
# output value, and add a docstring for users.
def DraggableList(items: List[Dict], key: str | None = None, **kwargs):
    """Create a new instance of "DraggableList".

    Parameters
    ----------
    items: List[Dict]
        The list of Items to display in the list. Each item must have "id", "order", "name".
         - "id": str. The unique id of the item.
         - "order": int. The order of the item in the list.
         - "name": str. The display name of the item.

    key: str or None
        An optional key that uniquely identifies this component. If this is
        None, and the component's arguments are changed, the component will
        be re-mounted in the Streamlit frontend and lose its current state.

    Returns
    -------
    str
        The dict of the item that was arranged.

    """
    # Call through to our private component function. Arguments we pass here
    # will be sent to the frontend, where they'll be available in an "args"
    # dictionary.
    #
    # "default" is a special argument that specifies the initial return
    # value of the component before the user has interacted with it.
    component_value = _component_func(items=items, key=key, **kwargs)

    # We could modify the value returned from the component if we wanted.
    # There's no need to do this in our simple example - but it's an option.
    return component_value


# Add some test code to play with the component while it's in development.
# During development, we can run this just as we would any other Streamlit
# app: `$ streamlit run my_component/__init__.py`
if not _RELEASE:
    import streamlit as st

    st.title("DraggableList")

    data = [
        {"id": "oct", "order": 10, "name": "Oct"},
        {"id": "nov", "order": 11, "name": "Nov"},
        {"id": "dec", "order": 12, "name": "Dec"},
        {"id": "jan", "order": 1, "name": "Jan"},
        {"id": "feb", "order": 2, "name": "Feb"},
        {"id": "mar", "order": 3, "name": "Mar"},
        {"id": "apr", "order": 4, "name": "Apr"},
        {"id": "may", "order": 5, "name": "May"},
        {"id": "jun", "order": 6, "name": "Jun"},
        {"id": "jul", "order": 7, "name": "Jul"},
        {"id": "aug", "order": 8, "name": "Aug"},
        {"id": "Sep", "order": 9, "name": "Sep"},
    ]

    slist = DraggableList(data, width="max-content")
    st.write(slist)
