// Take a look at the license at the top of the repository in the LICENSE file.

use std::mem;

use glib::translate::*;
use graphene::{Point, Rect, Size};

glib::wrapper! {
    /// A rectangular region with rounded corners.
    ///
    /// Application code should normalize rectangles using
    /// [`normalize()`][Self::normalize()]; this function will ensure that
    /// the bounds of the rectangle are normalized and ensure that the corner
    /// values are positive and the corners do not overlap.
    ///
    /// All functions taking a [`RoundedRect`][crate::RoundedRect] as an argument will internally
    /// operate on a normalized copy; all functions returning a [`RoundedRect`][crate::RoundedRect]
    /// will always return a normalized one.
    ///
    /// The algorithm used for normalizing corner sizes is described in
    /// [the CSS specification](https://drafts.csswg.org/css-backgrounds-3/#border-radius).
    #[doc(alias = "GskRoundedRect")]
    pub struct RoundedRect(BoxedInline<ffi::GskRoundedRect>);
}

impl RoundedRect {
    #[doc(alias = "gsk_rounded_rect_init")]
    pub fn new(
        bounds: Rect,
        top_left: Size,
        top_right: Size,
        bottom_right: Size,
        bottom_left: Size,
    ) -> Self {
        assert_initialized_main_thread!();
        unsafe {
            let mut rounded_rect = mem::MaybeUninit::uninit();
            ffi::gsk_rounded_rect_init(
                rounded_rect.as_mut_ptr(),
                bounds.to_glib_none().0,
                top_left.to_glib_none().0,
                top_right.to_glib_none().0,
                bottom_right.to_glib_none().0,
                bottom_left.to_glib_none().0,
            );
            Self::unsafe_from(rounded_rect.assume_init())
        }
    }

    #[doc(alias = "gsk_rounded_rect_init_from_rect")]
    #[doc(alias = "init_from_rect")]
    pub fn from_rect(bounds: Rect, radius: f32) -> Self {
        assert_initialized_main_thread!();
        unsafe {
            let mut rounded_rect = mem::MaybeUninit::uninit();
            ffi::gsk_rounded_rect_init_from_rect(
                rounded_rect.as_mut_ptr(),
                bounds.to_glib_none().0,
                radius,
            );
            Self::unsafe_from(rounded_rect.assume_init())
        }
    }

    /// Normalizes the passed rectangle.
    ///
    /// This function will ensure that the bounds of the rectangle
    /// are normalized and ensure that the corner values are positive
    /// and the corners do not overlap.
    ///
    /// # Returns
    ///
    /// the normalized rectangle
    #[doc(alias = "gsk_rounded_rect_normalize")]
    pub fn normalize(&mut self) {
        unsafe {
            ffi::gsk_rounded_rect_normalize(&mut self.inner);
        }
    }

    /// Offsets the bound's origin by @dx and @dy.
    ///
    /// The size and corners of the rectangle are unchanged.
    /// ## `dx`
    /// the horizontal offset
    /// ## `dy`
    /// the vertical offset
    ///
    /// # Returns
    ///
    /// the offset rectangle
    #[doc(alias = "gsk_rounded_rect_offset")]
    pub fn offset(&mut self, dx: f32, dy: f32) {
        unsafe {
            ffi::gsk_rounded_rect_offset(&mut self.inner, dx, dy);
        }
    }

    /// Shrinks (or grows) the given rectangle by moving the 4 sides
    /// according to the offsets given.
    ///
    /// The corner radii will be changed in a way that tries to keep
    /// the center of the corner circle intact. This emulates CSS behavior.
    ///
    /// This function also works for growing rectangles if you pass
    /// negative values for the @top, @right, @bottom or @left.
    /// ## `top`
    /// How far to move the top side downwards
    /// ## `right`
    /// How far to move the right side to the left
    /// ## `bottom`
    /// How far to move the bottom side upwards
    /// ## `left`
    /// How far to move the left side to the right
    ///
    /// # Returns
    ///
    /// the resized [`RoundedRect`][crate::RoundedRect]
    #[doc(alias = "gsk_rounded_rect_shrink")]
    pub fn shrink(&mut self, top: f32, right: f32, bottom: f32, left: f32) {
        unsafe {
            ffi::gsk_rounded_rect_shrink(&mut self.inner, top, right, bottom, left);
        }
    }

    /// Checks if all corners of @self are right angles and the
    /// rectangle covers all of its bounds.
    ///
    /// This information can be used to decide if [`ClipNode::new()`][crate::ClipNode::new()]
    /// or [`RoundedClipNode::new()`][crate::RoundedClipNode::new()] should be called.
    ///
    /// # Returns
    ///
    /// [`true`] if the rectangle is rectilinear
    #[doc(alias = "gsk_rounded_rect_is_rectilinear")]
    pub fn is_rectilinear(&self) -> bool {
        unsafe { from_glib(ffi::gsk_rounded_rect_is_rectilinear(&self.inner)) }
    }

    /// Checks if the given @point is inside the rounded rectangle.
    /// ## `point`
    /// the point to check
    ///
    /// # Returns
    ///
    /// [`true`] if the @point is inside the rounded rectangle
    #[doc(alias = "gsk_rounded_rect_contains_point")]
    pub fn contains_point(&self, point: Point) -> bool {
        unsafe {
            from_glib(ffi::gsk_rounded_rect_contains_point(
                &self.inner,
                point.to_glib_none().0,
            ))
        }
    }

    /// Checks if the given @rect is contained inside the rounded rectangle.
    /// ## `rect`
    /// the rectangle to check
    ///
    /// # Returns
    ///
    /// [`true`] if the @rect is fully contained inside the rounded rectangle
    #[doc(alias = "gsk_rounded_rect_contains_rect")]
    pub fn contains_rect(&self, rect: Rect) -> bool {
        unsafe {
            from_glib(ffi::gsk_rounded_rect_contains_rect(
                &self.inner,
                rect.to_glib_none().0,
            ))
        }
    }

    /// Checks if part of the given @rect is contained inside the rounded rectangle.
    /// ## `rect`
    /// the rectangle to check
    ///
    /// # Returns
    ///
    /// [`true`] if the @rect intersects with the rounded rectangle
    #[doc(alias = "gsk_rounded_rect_intersects_rect")]
    pub fn intersects_rect(&self, rect: Rect) -> bool {
        unsafe {
            from_glib(ffi::gsk_rounded_rect_intersects_rect(
                &self.inner,
                rect.to_glib_none().0,
            ))
        }
    }

    #[inline]
    pub fn bounds(&self) -> &graphene::Rect {
        unsafe {
            &*(&self.inner.bounds as *const graphene::ffi::graphene_rect_t as *const graphene::Rect)
        }
    }

    #[inline]
    pub fn corner(&self) -> &[graphene::Size; 4] {
        unsafe {
            &*(&self.inner.corner as *const [graphene::ffi::graphene_size_t; 4]
                as *const [graphene::Size; 4])
        }
    }
}

impl std::fmt::Debug for RoundedRect {
    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
        f.debug_struct("RoundedRect")
            .field("is_rectilinear", &self.is_rectilinear())
            .field("bounds", &self.bounds())
            .field("corner", &self.corner())
            .finish()
    }
}