import altair as alt
from altair.datasets import data
from shiny.express import render, ui

from shinywidgets import render_altair

ui.page_opts(title="Click a point for details", fillable=True)

cars = data.cars()

with ui.layout_columns(col_widths=[8, 4]):
    with ui.card(full_screen=True):
        ui.card_header("Click a car")

        @render_altair
        def scatter():
            pick = alt.selection_point(name="pick")
            return (
                alt.Chart(cars)
                .mark_circle()
                .encode(
                    x="Horsepower:Q",
                    y="Miles_per_Gallon:Q",
                    color=alt.condition(pick, alt.value("steelblue"), alt.value("lightgray")),
                )
                .add_params(pick)
            )

    with ui.card(full_screen=True):
        ui.card_header("Detail card")

        @render.ui
        def detail():
            rows = scatter.selected_rows("pick")
            if len(rows) == 0:
                return ui.p("Click a point to see its details.")
            car = rows.iloc[0]
            return ui.TagList(
                ui.h5(car["Name"]),
                ui.p(f"{car['Horsepower']:.0f} hp, {car['Miles_per_Gallon']:.1f} mpg"),
                ui.p(f"{car['Cylinders']} cylinders, {car['Origin']}"),
            )