use crate::prelude::*;
use iris_macro::widget_trait;

// these methods should "not require any context" (require unit) because they're in core
event_ctx!(());

widget_trait! {
    pub trait CoreWidget;

    fn pad(self, padding: impl Into<Padding>) -> impl WidgetFn<Pad> {
        |ui| Pad {
            padding: padding.into(),
            inner: self.add(ui),
        }
    }

    fn align(self, align: impl Into<Align>) -> impl WidgetFn<Aligned> {
        move |ui| Aligned {
            inner: self.add(ui),
            align: align.into(),
        }
    }

    fn center(self) -> impl WidgetFn<Aligned> {
        self.align(Align::CENTER)
    }

    fn label(self, label: impl Into<String>) -> impl WidgetIdFn<WL::Widget> {
        |ui| {
            let id = self.add(ui);
            id.set_label(label);
            id
        }
    }

    fn sized(self, size: impl Into<Size>) -> impl WidgetFn<Sized> {
        let size = size.into();
        move |ui| Sized {
            inner: self.add(ui),
            x: Some(size.x),
            y: Some(size.y),
        }
    }

    fn max_width(self, len: impl Into<Len>) -> impl WidgetFn<MaxSize> {
        let len = len.into();
        move |ui| MaxSize {
            inner: self.add(ui),
            x: Some(len),
            y: None,
        }
    }

    fn max_height(self, len: impl Into<Len>) -> impl WidgetFn<MaxSize> {
        let len = len.into();
        move |ui| MaxSize {
            inner: self.add(ui),
            x: None,
            y: Some(len),
        }
    }

    fn width(self, len: impl Into<Len>) -> impl WidgetFn<Sized> {
        let len = len.into();
        move |ui| Sized {
            inner: self.add(ui),
            x: Some(len),
            y: None,
        }
    }

    fn height(self, len: impl Into<Len>) -> impl WidgetFn<Sized> {
        let len = len.into();
        move |ui| Sized {
            inner: self.add(ui),
            x: None,
            y: Some(len),
        }
    }

    fn offset(self, amt: impl Into<UiVec2>) -> impl WidgetFn<Offset> {
        move |ui| Offset {
            inner: self.add(ui),
            amt: amt.into(),
        }
    }

    fn scroll(self) -> impl WidgetIdFn<Scroll> {
        move |ui| {
            Scroll::new(self.add(ui), Axis::Y)
                .on(CursorSense::Scroll, |ctx| {
                    let s = &mut *ctx.widget.get_mut();
                    s.scroll(ctx.data.scroll_delta.y * 50.0);
                })
                .add(ui)
        }
    }

    fn masked(self) -> impl WidgetFn<Masked> {
        move |ui| Masked {
            inner: self.add(ui),
        }
    }

    fn background<T,>(self, w: impl WidgetLike<T>) -> impl WidgetFn<Stack> {
        move |ui| Stack {
            children: vec![w.add(ui), self.add(ui)],
            size: StackSize::Child(1),
        }
    }

    fn foreground<T,>(self, w: impl WidgetLike<T>) -> impl WidgetFn<Stack> {
        move |ui| Stack {
            children: vec![self.add(ui), w.add(ui)],
            size: StackSize::Child(0),
        }
    }

    fn layer_offset(self, offset: usize) -> impl WidgetFn<LayerOffset> {
        move |ui| LayerOffset {
            inner: self.add(ui),
            offset,
        }
    }

    fn to_any(self) -> impl WidgetRet {
        |ui| self.add(ui)
    }

    fn set_ptr(self, ptr: &WidgetRef<WidgetPtr>, ui: &mut Ui) {
        ptr.get_mut().inner = Some(self.add(ui));
    }
}

pub trait CoreWidgetArr<const LEN: usize, Wa: WidgetArrLike<LEN, Tag>, Tag> {
    fn span(self, dir: Dir) -> SpanBuilder<LEN, Wa, Tag>;
    fn stack(self) -> StackBuilder<LEN, Wa, Tag>;
}

impl<const LEN: usize, Wa: WidgetArrLike<LEN, Tag>, Tag> CoreWidgetArr<LEN, Wa, Tag> for Wa {
    fn span(self, dir: Dir) -> SpanBuilder<LEN, Wa, Tag> {
        SpanBuilder::new(self, dir)
    }
    fn stack(self) -> StackBuilder<LEN, Wa, Tag> {
        StackBuilder::new(self)
    }
}