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use crate::{
    core::{algebra::Vector2, math::Rect, pool::Handle, scope_profile},
    message::UiMessage,
    widget::{Widget, WidgetBuilder},
    BuildContext, Control, Orientation, UiNode, UserInterface,
};
use std::{
    any::{Any, TypeId},
    ops::{Deref, DerefMut},
};

#[derive(Clone)]
pub struct StackPanel {
    pub widget: Widget,
    pub orientation: Orientation,
}

crate::define_widget_deref!(StackPanel);

impl Control for StackPanel {
    fn query_component(&self, type_id: TypeId) -> Option<&dyn Any> {
        if type_id == TypeId::of::<Self>() {
            Some(self)
        } else {
            None
        }
    }

    fn measure_override(&self, ui: &UserInterface, available_size: Vector2<f32>) -> Vector2<f32> {
        scope_profile!();

        let mut child_constraint = Vector2::new(f32::INFINITY, f32::INFINITY);

        match self.orientation {
            Orientation::Vertical => {
                child_constraint.x = available_size.x;

                if !self.widget.width().is_nan() {
                    child_constraint.x = self.widget.width();
                }

                child_constraint.x = child_constraint.x.clamp(self.min_width(), self.max_width());
            }
            Orientation::Horizontal => {
                child_constraint.y = available_size.y;

                if !self.widget.height().is_nan() {
                    child_constraint.y = self.widget.height();
                }

                child_constraint.y = child_constraint
                    .y
                    .clamp(self.min_height(), self.max_height());
            }
        }

        let mut measured_size = Vector2::default();

        for child_handle in self.widget.children() {
            ui.measure_node(*child_handle, child_constraint);

            let child = ui.node(*child_handle);
            let desired = child.desired_size();
            match self.orientation {
                Orientation::Vertical => {
                    if desired.x > measured_size.x {
                        measured_size.x = desired.x;
                    }
                    measured_size.y += desired.y;
                }
                Orientation::Horizontal => {
                    measured_size.x += desired.x;
                    if desired.y > measured_size.y {
                        measured_size.y = desired.y;
                    }
                }
            }
        }

        measured_size
    }

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

        let mut width = final_size.x;
        let mut height = final_size.y;

        match self.orientation {
            Orientation::Vertical => height = 0.0,
            Orientation::Horizontal => width = 0.0,
        }

        for child_handle in self.widget.children() {
            let child = ui.node(*child_handle);
            match self.orientation {
                Orientation::Vertical => {
                    let child_bounds = Rect::new(
                        0.0,
                        height,
                        width.max(child.desired_size().x),
                        child.desired_size().y,
                    );
                    ui.arrange_node(*child_handle, &child_bounds);
                    width = width.max(child.desired_size().x);
                    height += child.desired_size().y;
                }
                Orientation::Horizontal => {
                    let child_bounds = Rect::new(
                        width,
                        0.0,
                        child.desired_size().x,
                        height.max(child.desired_size().y),
                    );
                    ui.arrange_node(*child_handle, &child_bounds);
                    width += child.desired_size().x;
                    height = height.max(child.desired_size().y);
                }
            }
        }

        match self.orientation {
            Orientation::Vertical => {
                height = height.max(final_size.y);
            }
            Orientation::Horizontal => {
                width = width.max(final_size.x);
            }
        }

        Vector2::new(width, height)
    }

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

pub struct StackPanelBuilder {
    widget_builder: WidgetBuilder,
    orientation: Option<Orientation>,
}

impl StackPanelBuilder {
    pub fn new(widget_builder: WidgetBuilder) -> Self {
        Self {
            widget_builder,
            orientation: None,
        }
    }

    pub fn with_orientation(mut self, orientation: Orientation) -> Self {
        self.orientation = Some(orientation);
        self
    }

    pub fn build(self, ctx: &mut BuildContext) -> Handle<UiNode> {
        let stack_panel = StackPanel {
            widget: self.widget_builder.build(),
            orientation: self.orientation.unwrap_or(Orientation::Vertical),
        };

        ctx.add_node(UiNode::new(stack_panel))
    }
}