use iced::Settings;
use iced::pure::widget::{Button, Column, Container, Text};
use iced::pure::Sandbox;
use main_page::MainPage;

mod main_page;


fn main() -> Result<(), iced::Error> {
    Counter::run(Settings::default())
}

struct Counter {
    count: i32,
    current_view: Views,
}

#[derive(Debug, Clone, Copy)]
pub enum Views {
    Counter,
    Main
}

#[derive(Debug, Clone, Copy)]
pub enum CounterMessage {
    Increment,
    Decrement,
    ChangePage(Views)
}

impl Sandbox for Counter {
    type Message = CounterMessage;

    fn new() -> Self {
        Counter {
            count: 0,
            current_view: Views::Counter,
        }
    }

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

    fn update(&mut self, message: Self::Message) {
        match message {
            CounterMessage::Increment => self.count += 1,
            CounterMessage::Decrement => self.count -= 1,
            CounterMessage::ChangePage(view) => self.current_view = view
        }
    }

    fn view(&self) -> iced::pure::Element<Self::Message> {
        let label = Text::new(format!("Count: {}", self.count));
        let incr = Button::new("Increment").on_press(CounterMessage::Increment);
        let decr = Button::new("Decrement").on_press(CounterMessage::Decrement);
        let navigate = Button::new(Text::new("Go to the next page")).on_press(CounterMessage::ChangePage(Views::Main));
        let col = Column::new().push(incr).push(label).push(decr).push(navigate).spacing(5);
        let counter_layout = Container::new(col).center_x().center_y().width(iced::Length::Fill).height(iced::Length::Fill);

        match self.current_view {
            Views::Counter => counter_layout.into(),
            Views::Main => MainPage::view(self)
        }
    }
}