use tengri::{self, Usually, Perhaps, input::*, output::*, tui::*, dsl::*};
use std::sync::{Arc, RwLock};
use crate::ratatui::style::Color;
//use crossterm::event::{*, KeyCode::*};

fn main () -> Usually<()> {
    let state = Example::new();
    Tui::new().unwrap().run(&state)?;
    Ok(())
}

#[derive(Debug)] pub struct Example(
    usize,
    Measure<TuiOut>
);

impl Example {
    fn new () -> Arc<RwLock<Self>> {
        Arc::new(RwLock::new(Example(10, Measure::new())))
    }
    const BINDS: &'static str = stringify! {
        (@left prev)
        (@right next)
    };
    const VIEWS: &'static [&'static str] = &[
        stringify! { :hello-world },
        stringify! { (fill/xy :hello-world) },
        stringify! { (bsp/s :hello :world) },
        stringify! { (fixed/xy 20 10 :hello-world) },
        stringify! { (bsp/s (fixed/xy 5 6 :hello) (fixed/xy 7 8 :world)) },
        stringify! { (bsp/e (fixed/xy 5 6 :hello) (fixed/xy 7 8 :world)) },
        stringify! { (bsp/n (fixed/xy 5 6 :hello) (fixed/xy 7 8 :world)) },
        stringify! { (bsp/w (fixed/xy 5 6 :hello) (fixed/xy 7 8 :world)) },
        stringify! { (bsp/a (fixed/xy 5 6 :hello) (fixed/xy 7 8 :world)) },
        stringify! { (bsp/b (fixed/xy 5 6 :hello) (fixed/xy 7 8 :world)) },
        stringify! {
            (bsp/s
              (bsp/e       (align/nw (fixed/xy 5 3 :hello))
                (bsp/e     (align/n  (fixed/xy 5 3 :hello))
                           (align/ne (fixed/xy 5 3 :hello))))
                (bsp/s
                  (bsp/e   (align/w  (fixed/xy 5 3 :hello))
                    (bsp/e (align/c  (fixed/xy 5 3 :hello))
                           (align/e  (fixed/xy 5 3 :hello))))
                  (bsp/e   (align/sw (fixed/xy 5 3 :hello))
                    (bsp/e (align/s  (fixed/xy 5 3 :hello))
                           (align/se (fixed/xy 5 3 :hello))))))
        },
        stringify! {
            (bsp/s
              (bsp/e     (fixed/xy 8 5 (align/nw :hello))
                (bsp/e   (fixed/xy 8 5 (align/n  :hello))
                         (fixed/xy 8 5 (align/ne :hello))))
              (bsp/s
                (bsp/e   (fixed/xy 8 5 (align/w  :hello))
                  (bsp/e (fixed/xy 8 5 (align/c  :hello))
                         (fixed/xy 8 5 (align/e  :hello))))
                (bsp/e   (fixed/xy 8 5 (align/sw :hello))
                  (bsp/e (fixed/xy 8 5 (align/s  :hello))
                         (fixed/xy 8 5 (align/se :hello))))))
        },
        stringify! {
            (bsp/s
              (bsp/e     (grow/xy 1 1 (fixed/xy 8 5 (align/nw :hello)))
                (bsp/e   (grow/xy 1 1 (fixed/xy 8 5 (align/n  :hello)))
                         (grow/xy 1 1 (fixed/xy 8 5 (align/ne :hello)))))
              (bsp/s
                (bsp/e   (grow/xy 1 1 (fixed/xy 8 5 (align/w  :hello)))
                  (bsp/e (grow/xy 1 1 (fixed/xy 8 5 (align/c  :hello)))
                         (grow/xy 1 1 (fixed/xy 8 5 (align/e  :hello)))))
                (bsp/e   (grow/xy 1 1 (fixed/xy 8 5 (align/sw :hello)))
                  (bsp/e (grow/xy 1 1 (fixed/xy 8 5 (align/s  :hello)))
                         (grow/xy 1 1 (fixed/xy 8 5 (align/se :hello)))))))
        },
        stringify! { :map-e },
        stringify! { (align/c :map-e) },
        stringify! { :map-s },
        stringify! { (align/c :map-s) },
        stringify! {
            (align/c (bg/behind :bg0 (margin/xy 1 1 (col
              (bg/behind :bg1 (border/around :border1 (margin/xy 2 1 :label1)))
              (bg/behind :bg2 (border/around :border2 (margin/xy 4 2 :label2)))
              (bg/behind :bg3 (border/around :border3 (margin/xy 6 3 :label3)))))))
        },
    ];
}

tui_draw!(|self: Example, to|to.place(&self.content()));

content!(TuiOut: |self: Example|{
    let index   = self.0 + 1;
    let wh      = self.1.wh();
    let src     = EXAMPLES.get(self.0).unwrap_or(&"");
    let heading = format!("Example {}/{} in {:?}", index, EXAMPLES.len(), &wh);
    let title   = Tui::bg(Color::Rgb(60, 10, 10), Push::y(1, Align::n(heading)));
    let code    = Tui::bg(Color::Rgb(10, 60, 10), Push::y(2, Align::n(format!("{}", src))));
    let content = ();//Tui::bg(Color::Rgb(10, 10, 60), View(self, CstIter::new(src)));
    self.1.of(Bsp::s(title, Bsp::n(""/*code*/, content)))
});

handle!(TuiIn: |self: Example, input|{
    Ok(None)/*if let Some(command) = CstIter::new(KEYMAP).command::<_, ExampleCommand, _>(self, input) {
        command.execute(self)?;
        Some(true)
    } else {
        None
    })*/
});

//#[tengri_proc::expose]
//impl Example {
    //fn _todo_u16_stub (&self) -> u16 { todo!() }
    //fn _todo_bool_stub (&self) -> bool { todo!() }
    //fn _todo_usize_stub (&self) -> usize { todo!() }
    ////[bool]  => {}
    ////[u16]   => {}
    ////[usize] => {}
//}

#[tengri_proc::command(Example)]
impl ExampleCommand {
    fn next (state: &mut Example) -> Perhaps<Self> {
        state.0 = (state.0 + 1) % EXAMPLES.len();
        Ok(None)
    }
    fn prev (state: &mut Example) -> Perhaps<Self> {
        state.0 = if state.0 > 0 { state.0 - 1 } else { EXAMPLES.len() - 1 };
        Ok(None)
    }
}

//#[tengri_proc::view(TuiOut)]
//impl Example {
    //pub fn title (&self) -> impl Draw<TuiOut> + use<'_> {
        //Tui::bg(Color::Rgb(60,  10, 10), Push::y(1, Align::n(format!("Example {}/{}:", self.0 + 1, EXAMPLES.len())))).boxed()
    //}
    //pub fn code (&self) -> impl Draw<TuiOut> + use<'_> {
        //Tui::bg(Color::Rgb(10,  60, 10), Push::y(2, Align::n(format!("{}", EXAMPLES[self.0])))).boxed()
    //}
    //pub fn hello (&self) -> impl Draw<TuiOut> + use<'_> {
        //Tui::bg(Color::Rgb(10, 100, 10), "Hello").boxed()
    //}
    //pub fn world (&self) -> impl Draw<TuiOut> + use<'_> {
        //Tui::bg(Color::Rgb(100, 10, 10), "world").boxed()
    //}
    //pub fn hello_world (&self) -> impl Draw<TuiOut> + use<'_> {
        //"Hello world!".boxed()
    //}
    //pub fn map_e (&self) -> impl Draw<TuiOut> + use<'_> {
        //Map::east(5u16, ||0..5u16, |n, _i|format!("{n}")).boxed()
    //}
    //pub fn map_s (&self) -> impl Draw<TuiOut> + use<'_> {
        //Map::south(5u16, ||0..5u16, |n, _i|format!("{n}")).boxed()
    //}
//}
/*

    fn content (&self) -> dyn Draw<Engine = Tui> {
        let border_style = Style::default().fg(Color::Rgb(0,0,0));
        Align::Center(Layers::new(move|add|{

            add(&Background(Color::Rgb(0,128,128)))?;

            add(&Margin::XY(1, 1, Stack::down(|add|{

                add(&Layers::new(|add|{
                    add(&Background(Color::Rgb(128,96,0)))?;
                    add(&Border(Square(border_style)))?;
                    add(&Margin::XY(2, 1, "..."))?;
                    Ok(())
                }).debug())?;

                add(&Layers::new(|add|{
                    add(&Background(Color::Rgb(128,64,0)))?;
                    add(&Border(Lozenge(border_style)))?;
                    add(&Margin::XY(4, 2, "---"))?;
                    Ok(())
                }).debug())?;

                add(&Layers::new(|add|{
                    add(&Background(Color::Rgb(96,64,0)))?;
                    add(&Border(SquareBold(border_style)))?;
                    add(&Margin::XY(6, 3, "~~~"))?;
                    Ok(())
                }).debug())?;

                Ok(())
            })).debug())?;

            Ok(())

        }))
        //Align::Center(Margin::X(1, Layers::new(|add|{
            //add(&Background(Color::Rgb(128,0,0)))?;
            //add(&Stack::down(|add|{
                //add(&Margin::Y(1, Layers::new(|add|{
                    //add(&Background(Color::Rgb(0,128,0)))?;
                    //add(&Align::Center("12345"))?;
                    //add(&Align::Center("FOO"))
                //})))?;
                //add(&Margin::XY(1, 1, Layers::new(|add|{
                    //add(&Align::Center("1234567"))?;
                    //add(&Align::Center("BAR"))?;
                    //add(&Background(Color::Rgb(0,0,128)))
                //})))
            //}))
        //})))

        //Align::Y(Layers::new(|add|{
            //add(&Background(Color::Rgb(128,0,0)))?;
            //add(&Margin::X(1, Align::Center(Stack::down(|add|{
                //add(&Align::X(Margin::Y(1, Layers::new(|add|{
                    //add(&Background(Color::Rgb(0,128,0)))?;
                    //add(&Align::Center("12345"))?;
                    //add(&Align::Center("FOO"))
                //})))?;
                //add(&Margin::XY(1, 1, Layers::new(|add|{
                    //add(&Align::Center("1234567"))?;
                    //add(&Align::Center("BAR"))?;
                    //add(&Background(Color::Rgb(0,0,128)))
                //})))?;
                //Ok(())
            //})))))
        //}))
    }
*/