//! Simple calendar applications.
mod calendar;

use calendar::{CalendarMonthView, CalendarParams };

use iced::{
    Alignment, Column, Row,
    Container, Element, Length, Sandbox, Settings,
    Button, Text,
};
use iced::button;
use iced::theme;

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

#[derive(Default)]
struct CalendarApp {
    month: i32,
    controls: Controls,
}

#[derive(Debug, Clone, Copy)]
enum Message {
    NextMonth,
    PrevMonth,
}

#[derive(Default)]
struct Controls {
    prev_button: button::State,
    next_button: button::State,
}

impl Controls {
    fn view(&mut self, month_name: &str) -> Element<Message> {
        Row::new()
            .align_items(Alignment::Center)
            .padding(5)
            .spacing(10)
            .push(
                Button::new(&mut self.prev_button, Text::new("<<"))
                .on_press(Message::PrevMonth)
                .style(theme::Button::Secondary),
            )
            .push(
                Text::new(month_name)
                    .width(Length::Shrink)
                    .size(50),
            )
            .push(
                Button::new(&mut self.next_button, Text::new(">>"))
                    .on_press(Message::NextMonth)
                    .style(theme::Button::Secondary),
            )
            .into()
    }
}

impl Sandbox for CalendarApp {
    type Message = Message;

    fn new() -> Self {
        CalendarApp {
            month: 7,
            ..CalendarApp::default()
        }
    }

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

    fn update(&mut self, message: Message) {
        match message {
            Message::PrevMonth => {
                self.month = (self.month + 12 - 1) % 12;
            }
            Message::NextMonth => {
                self.month = (self.month + 12 + 1) % 12;
            }
        }
        println!("month={}", self.month);
    }

    fn view(&mut self) -> Element<Message> {
        const MONTH_NAMES: [&str;12] = [
            "January",
            "February",
            "March",
            "April",
            "May",
            "June",
            "July",
            "August",
            "September",
            "October",
            "Novemeber",
            "December",
        ];
        let content = Column::new()
            .align_items(Alignment::Fill)
            .push(self.controls.view(MONTH_NAMES[self.month as usize]))
            .push(CalendarMonthView::new(&CalendarParams::new(), self.month))
            ;

//        let area = Row::new()
//            .align_items(Alignment::Fill)
//            .push(Column::new()
//                .align_items(Alignment::Start)
//                .push(CalendarMonthView::new(6))
//                .push(CalendarMonthView::new(6))
//            )
//            .push(content)
//            ;
        Container::new(content)
            .width(Length::Fill)
            .height(Length::Fill)
            .center_x()
            .center_y()
            .into()
    }
}