use crate::{Axis, Holds, PxVec2, UiRegion};

/// Dependencies of one evaluation, before the frame and extent are composed.
#[derive(Clone, Copy, Debug, PartialEq)]
pub struct LayoutHolds {
    pub frame: [Holds; 2],
    pub extent: [Holds; 2],
    pub placement: Option<UiRegion>,
}

impl LayoutHolds {
    pub const ANY: Self = Self {
        frame: [Holds::ANY; 2],
        extent: [Holds::ANY; 2],
        placement: None,
    };

    pub fn contains(self, px: PxVec2, placement: UiRegion) -> bool {
        self.placement.is_none_or(|old| old == placement)
            && [Axis::X, Axis::Y].into_iter().all(|axis| {
                self.frame[axis as usize].contains(px.axis(axis))
                    && self.extent[axis as usize]
                        .contains(placement.axis(axis).len().to_px(px.axis(axis)))
            })
    }

    pub fn in_frame(self, placement: UiRegion) -> [Holds; 2] {
        [Axis::X, Axis::Y].map(|axis| {
            self.frame[axis as usize]
                .and(self.extent[axis as usize].through(placement.axis(axis).len()))
        })
    }
}