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

use crate::{RenderNode, RenderNodeType};
use glib::translate::*;

glib::wrapper! {
    /// A render node that can contain other render nodes.
    #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
    #[doc(alias = "GskContainerNode")]
    pub struct ContainerNode(Shared<ffi::GskContainerNode>);

    match fn {
        ref => |ptr| ffi::gsk_render_node_ref(ptr as *mut ffi::GskRenderNode),
        unref => |ptr| ffi::gsk_render_node_unref(ptr as *mut ffi::GskRenderNode),
    }
}

define_render_node!(
    ContainerNode,
    ffi::GskContainerNode,
    ffi::gsk_container_node_get_type,
    RenderNodeType::ContainerNode
);

impl ContainerNode {
    /// Creates a new [`RenderNode`][crate::RenderNode] instance for holding the given `children`.
    ///
    /// The new node will acquire a reference to each of the children.
    /// ## `children`
    /// The children of the node
    ///
    /// # Returns
    ///
    /// the new [`RenderNode`][crate::RenderNode]
    #[doc(alias = "gsk_container_node_new")]
    pub fn new(children: &[RenderNode]) -> Self {
        assert_initialized_main_thread!();
        let n_children = children.len() as u32;
        unsafe {
            from_glib_full(ffi::gsk_container_node_new(
                children.to_glib_none().0,
                n_children,
            ))
        }
    }

    /// Gets one of the children of `container`.
    /// ## `idx`
    /// the position of the child to get
    ///
    /// # Returns
    ///
    /// the `idx`'th child of `container`
    #[doc(alias = "gsk_container_node_get_child")]
    #[doc(alias = "get_child")]
    pub fn child(&self, idx: u32) -> Option<RenderNode> {
        unsafe {
            from_glib_none(ffi::gsk_container_node_get_child(
                self.to_glib_none().0,
                idx,
            ))
        }
    }

    /// Retrieves the number of direct children of `self`.
    ///
    /// # Returns
    ///
    /// the number of children of the [`RenderNode`][crate::RenderNode]
    #[doc(alias = "gsk_container_node_get_n_children")]
    #[doc(alias = "get_n_children")]
    pub fn n_children(&self) -> u32 {
        unsafe { ffi::gsk_container_node_get_n_children(self.to_glib_none().0) }
    }
}