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use crate::{
    core::{algebra::Vector2, math::Rect, pool::Handle, scope_profile},
    message::{MessageData, UiMessage},
    widget::{Widget, WidgetBuilder},
    BuildContext, Control, UINode, UserInterface,
};
use std::ops::{Deref, DerefMut};

/// Allows user to directly set position and size of a node
#[derive(Clone)]
pub struct Canvas<M: MessageData, C: Control<M, C>> {
    widget: Widget<M, C>,
}

crate::define_widget_deref!(Canvas<M, C>);

impl<M: MessageData, C: Control<M, C>> Control<M, C> for Canvas<M, C> {
    fn measure_override(
        &self,
        ui: &UserInterface<M, C>,
        _available_size: Vector2<f32>,
    ) -> Vector2<f32> {
        scope_profile!();

        let size_for_child = Vector2::new(std::f32::INFINITY, std::f32::INFINITY);

        for child_handle in self.widget.children() {
            ui.node(*child_handle).measure(ui, size_for_child);
        }

        Vector2::default()
    }

    fn arrange_override(&self, ui: &UserInterface<M, C>, final_size: Vector2<f32>) -> Vector2<f32> {
        scope_profile!();

        for child_handle in self.widget.children() {
            let child = ui.nodes.borrow(*child_handle);
            child.arrange(
                ui,
                &Rect::new(
                    child.desired_local_position().x,
                    child.desired_local_position().y,
                    child.desired_size().x,
                    child.desired_size().y,
                ),
            );
        }

        final_size
    }

    fn handle_routed_message(
        &mut self,
        ui: &mut UserInterface<M, C>,
        message: &mut UiMessage<M, C>,
    ) {
        self.widget.handle_routed_message(ui, message);
    }
}

impl<M: MessageData, C: Control<M, C>> Canvas<M, C> {
    pub fn new(widget: Widget<M, C>) -> Self {
        Self { widget }
    }
}

pub struct CanvasBuilder<M: MessageData, C: Control<M, C>> {
    widget_builder: WidgetBuilder<M, C>,
}

impl<M: MessageData, C: Control<M, C>> CanvasBuilder<M, C> {
    pub fn new(widget_builder: WidgetBuilder<M, C>) -> Self {
        Self { widget_builder }
    }

    pub fn build(self, ui: &mut BuildContext<M, C>) -> Handle<UINode<M, C>> {
        let canvas = Canvas {
            widget: self.widget_builder.build(),
        };
        ui.add_node(UINode::Canvas(canvas))
    }
}