import streamlit as st


# Streamlit widgets with persistence
# TODO: better detection of whether a field has been updated
def update_card_dict(key_list, default=None):
    state_key = "_".join(key_list)
    if st.session_state.save_state.get(state_key, default) != default:
        card_key = key_list[-1]
        current_dict = st.session_state.card_dict
        for key in key_list[:-1]:
            current_dict = current_dict[key]
        current_dict[card_key] = st.session_state.save_state[state_key]


def make_multiselect(
    key_list, label, options, format_func=lambda x: x, help="", default=None
):
    key = "_".join(key_list)
    if key in st.session_state:
        st.session_state.save_state[key] = st.session_state[key]
    elif default is not None:
        st.session_state.save_state[key] = default
    res = st.multiselect(
        label=label,
        options=options,
        format_func=format_func,
        key=key,
        default=st.session_state.save_state.get(key, []),
        help=help,
    )
    update_card_dict(key_list, default=[])
    return res


def make_selectbox(key_list, label, options, format_func=lambda x: x, help="", index=None, on_change=None):
    key = "_".join(key_list)
    if key in st.session_state:
        st.session_state.save_state[key] = st.session_state[key]
    elif index is not None:
        st.session_state.save_state[key] = options[index]
    res = st.selectbox(
        label=label,
        options=options,
        format_func=format_func,
        key=key,
        index=options.index(
            st.session_state.save_state.get(key, options[0])
        ),  # if st.session_state.save_state.get(key, options[0]) in options else 0,
        help=help,
        on_change=on_change,
    )
    update_card_dict(key_list, default=[])
    return res


def make_radio(key_list, label, options, format_func=lambda x: x, help="", index=None):
    key = "_".join(key_list)
    if key in st.session_state:
        st.session_state.save_state[key] = st.session_state[key]
    elif index is not None:
        st.session_state.save_state[key] = options[index]
    res = st.radio(
        label=label,
        options=options,
        format_func=format_func,
        key=key,
        index=options.index(st.session_state.save_state.get(key, options[0])),
        help=help,
    )
    update_card_dict(key_list)
    return res


def make_text_input(key_list, label, help="", value=None):
    key = "_".join(key_list)
    if key in st.session_state:
        st.session_state.save_state[key] = st.session_state[key]
    elif value is not None:
        st.session_state.save_state[key] = value
    res = st.text_input(
        label=label,
        key=key,
        value=st.session_state.save_state.get(key, ""),
        help=help,
    )
    update_card_dict(key_list, default="")
    return res


def make_text_area(key_list, label, help="", value=None):
    key = "_".join(key_list)
    if key in st.session_state:
        st.session_state.save_state[key] = st.session_state[key]
    elif value is not None:
        st.session_state.save_state[key] = value
    res =  st.text_area(
        label=label,
        key=key,
        value=st.session_state.save_state.get(key, ""),
        help=help,
    )
    update_card_dict(key_list, default="")
    return res


def make_checkbox(key_list, label, help="", value=None):
    key = "_".join(key_list)
    if key in st.session_state:
        st.session_state.save_state[key] = st.session_state[key]
    elif value is not None:
        st.session_state.save_state[key] = value
    res = st.checkbox(
        label=label,
        key=key,
        value=st.session_state.save_state.get(key, False),
        help=help,
    )
    update_card_dict(key_list)
    return res