use orbtk::prelude::*;

use crate::{data::PolicyList, keys::*};

/// Provides generic methods to handle states of datatypes (e.g. used in `PolicyList`).
pub trait BaseState {
    /// Navigates to the given entity.
    fn navigate(&self, to: Entity, ctx: &mut Context) {
	if let Some(old_focused_element) = ctx.window().get::<Global>("global").focused_widget {
	    let mut old_focused_element = ctx.get_widget(old_focused_element);
	    old_focused_element.set("focused", false);
	    old_focused_element.update_theme_by_state(false);
	}
	ctx.window().get_mut::<Global>("global").focused_widget = None;
	ctx.widget().set("visibility", Visibility::Collapsed);
	ctx.get_widget(to).set("visibility", Visibility::Visible);
    }

    /// Fetches the text of a widget.
    fn fetch_text(&self, ctx: &mut Context, entity: Entity) -> Option<String> {
	let mut widget = ctx.get_widget(entity);

	let entry = widget.get_mut::<String>("text");
	if entry.is_empty() {
	    return None;
	}

	let copy = entry.to_string();
	entry.clear();
	Some(copy)
    }

    // Save the data.
    fn save(&self, registry: &mut Registry, ctx: &mut Context) {
	registry
	    .get::<Settings>("settings")
	    .save(
		PROP_POLICY_LISTS,
		ctx.widget().get::<PolicyList>(PROP_POLICY_LISTS),
	    )
	    .unwrap();
    }
}