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use map_gui::tools::grey_out_map;
use widgetry::tools::open_browser;
use widgetry::{EventCtx, GfxCtx, Line, Panel, SimpleState, State, Text, Widget};

use crate::{App, Transition};

pub struct About;

impl About {
    pub fn new_state(ctx: &mut EventCtx) -> Box<dyn State<App>> {
        let panel = Panel::new_builder(Widget::col(vec![
            Widget::row(vec![
                Line("About the LTN tool").small_heading().into_widget(ctx),
                ctx.style().btn_close_widget(ctx),
            ]),
            Text::from_multiline(vec![
                Line("Created by Dustin Carlino, Cindy Huang, and Jennifer Ding"),
                Line("Developed at the Alan Turing Institute"),
                Line("Data from OpenStreetMap"),
                Line("See below for full credits and more info"),
            ])
            .into_widget(ctx),
            ctx.style()
                .btn_outline
                .text("ltn.abstreet.org")
                .build_def(ctx),
        ]))
        .build(ctx);
        <dyn SimpleState<_>>::new_state(panel, Box::new(About))
    }
}

impl SimpleState<App> for About {
    fn on_click(&mut self, _: &mut EventCtx, _: &mut App, x: &str, _: &mut Panel) -> Transition {
        if x == "close" {
            return Transition::Pop;
        } else if x == "ltn.abstreet.org" {
            open_browser("http://ltn.abstreet.org");
        }
        Transition::Keep
    }

    fn draw(&self, g: &mut GfxCtx, app: &App) {
        grey_out_map(g, app);
    }
}