use std::{cell::RefCell, future::Future};

use crate::prelude::Render;

pub trait GenericNode: std::fmt::Debug + Clone + PartialEq + std::cmp::Eq + 'static {
    /// Create a new element node.
    fn element(tag: &str) -> Self;

    /// Create a new text node.
    fn text_node(text: &str) -> Self;

    /// Create a new fragment (list of nodes). A fragment is not necessarily wrapped around by an element.
    fn fragment() -> Self;

    /// Create a marker (dummy) node. For [`DomNode`], this is implemented by creating an empty comment node.
    /// This is used, for example, in [`Keyed`] and [`Indexed`] for scenarios where you want to push a new item to the
    /// end of the list. If the list is empty, a dummy node is needed to store the position of the component.
    fn marker() -> Self;

    /// Sets an attribute on a node.
    fn set_attribute(&self, name: &str, value: &str);

    /// Appends a child to the node's children.
    fn append_child(&self, child: &Self);

    /// Insert a new child node to this node's children. If `reference_node` is `Some`, the child will be inserted
    /// before the reference node. Else if `None`, the child will be inserted at the end.
    fn insert_child_before(&self, new_node: &Self, reference_node: Option<&Self>);

    /// Remove a child node from this node's children.
    fn remove_child(&self, child: &Self);

    /// Replace a child node from this node's children with a new child node.
    fn replace_child(&self, old: &Self, new: &Self);

    /// Insert a new node before this node.
    fn insert_sibling_before(&self, child: &Self);

    /// Returns the parent node, or `None` if detached.
    fn parent_node(&self) -> Option<Self>;

    /// Returns the next sibling, or `None` if this node is the last sibling.
    fn next_sibling(&self) -> Option<Self>;

    /// Remove this node from the tree.
    fn remove_self(&self);

    /// Update inner text of the node. If the node has elements, all the elements are replaced with a new text node.
    fn update_inner_text(&self, text: &str);

    /// Replace all the children in a node with a new node
    fn replace_children_with(&self, node: &Self);

    fn effect(&self, future: impl Future<Output = ()> + 'static);

    fn children(&self) -> RefCell<Vec<Self>>;

    fn append_render(&self, render: impl Render<Self> + 'static) {
        Box::new(render).render_into(self).unwrap();
    }
}

pub trait EventListener {
    type Handler;
    fn event(&self, name: &str, handler: Self::Handler);
}

/// Allows you to acquire a node during template processing
pub trait NodeReference {
    type Target;
    fn try_get(&self) -> Option<Self::Target>;
    fn set(&self, node: Self::Target);
}