use iced::{
    widget::{column, row, text, text_input},
    Element, Sandbox, Settings,
};

use volute::volume::{CubicMetre, Volume};

pub fn main() -> iced::Result {
    App::run(Settings::default())
}

struct App {
    displacement: Box<dyn Volume>,
    ui: UI,
}

#[derive(Default)]
struct UI {
    displacement: String,
}

impl App {
    fn set_displacement(&mut self, displacement: &str) {
        if displacement.len() == 0 {
            self.displacement.set(0.0);
            self.ui.displacement = "".to_string();
        } else if let Ok(d) = displacement.parse::<f64>() {
            self.displacement.set(d);
            self.ui.displacement = String::from(displacement);
        }
    }
}

impl Default for App {
    fn default() -> Self {
        Self {
            displacement: Box::new(CubicMetre::default()),
            ui: UI::default(),
        }
    }
}

impl Sandbox for App {
    type Message = Message;

    fn new() -> Self {
        Self::default()
    }

    fn title(&self) -> String {
        String::from("volute")
    }

    fn update(&mut self, message: Message) {
        match message {
            Message::DisplacementChanged(displacement) => {
                self.set_displacement(&displacement);
            }
        }
    }

    fn view(&self) -> Element<Self::Message> {
        column![row![
            text("Displacement:"),
            text_input("2.0", &self.ui.displacement, Message::DisplacementChanged),
            text(self.displacement.unit()),
        ]]
        .into()
    }
}

#[derive(Debug, Clone)]
pub enum Message {
    DisplacementChanged(String),
}