// Copyright 2023 System76 <info@system76.com>
// SPDX-License-Identifier: MPL-2.0

//! Application API example

use cosmic::app::{Command, Core, Settings};
use cosmic::{executor, iced, ApplicationExt, Element};

/// Runs application with these settings
#[rustfmt::skip]
fn main() -> Result<(), Box<dyn std::error::Error>> {
    cosmic::app::run::<App>(Settings::default(), ())?;

    Ok(())
}

/// Messages that are used specifically by our [`App`].
#[derive(Clone, Debug)]
pub enum Message {
    Clicked,
}

/// The [`App`] stores application-specific state.
pub struct App {
    core: Core,
}

/// Implement [`cosmic::Application`] to integrate with COSMIC.
impl cosmic::Application for App {
    /// Default async executor to use with the app.
    type Executor = executor::Default;

    /// Argument received [`cosmic::Application::new`].
    type Flags = ();

    /// Message type specific to our [`App`].
    type Message = Message;

    /// The unique application ID to supply to the window manager.
    const APP_ID: &'static str = "org.cosmic.AppDemo";

    fn core(&self) -> &Core {
        &self.core
    }

    fn core_mut(&mut self) -> &mut Core {
        &mut self.core
    }

    /// Creates the application, and optionally emits command on initialize.
    fn init(core: Core, _input: Self::Flags) -> (Self, Command<Self::Message>) {
        let mut app = App { core };

        let command = app.update_title();

        (app, command)
    }

    /// Handle application events here.
    fn update(&mut self, message: Self::Message) -> Command<Self::Message> {
        if let Message::Clicked = message {
            eprintln!("clicked");
        }

        Command::none()
    }

    /// Creates a view after each update.
    fn view(&self) -> Element<Self::Message> {
        let content = cosmic::widget::column()
            .spacing(12)
            .push(
                cosmic::widget::button::image("/usr/share/backgrounds/pop/kait-herzog-8242.jpg")
                    .width(600.0)
                    .selected(true)
                    .on_press(Message::Clicked),
            )
            .push(
                cosmic::widget::button::image(
                    "/usr/share/backgrounds/pop/kate-hazen-unleash-your-robot-blue.png",
                )
                .width(600.0)
                .selected(true)
                .on_press(Message::Clicked),
            );

        let centered = cosmic::widget::container(content)
            .width(iced::Length::Fill)
            .height(iced::Length::Shrink)
            .align_x(iced::alignment::Horizontal::Center)
            .align_y(iced::alignment::Vertical::Center);

        Element::from(centered)
    }
}

impl App
where
    Self: cosmic::Application,
{
    fn update_title(&mut self) -> Command<Message> {
        self.set_header_title(String::from("Image Button Demo"));
        self.set_window_title(String::from("Image Button Demo"))
    }
}