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use super::Props;
use crate::{
  callback::PersistedCallback, create_element, hooks::JsRefContainer, VNode,
  VNodeList,
};
use wasm_bindgen::{
  convert::{FromWasmAbi, IntoWasmAbi},
  JsValue,
};
use web_sys::Element;

#[doc(hidden)]
#[derive(Debug, Clone, Copy)]
pub struct HtmlTag<'a>(pub &'a str);

impl<'a> AsRef<str> for HtmlTag<'a> {
  fn as_ref(&self) -> &str {
    &self.0
  }
}

#[doc(hidden)]
#[derive(Debug, Clone, Copy)]
pub struct ImportedComponent<'a>(pub &'a JsValue);

impl<'a> AsRef<JsValue> for ImportedComponent<'a> {
  fn as_ref(&self) -> &JsValue {
    &self.0
  }
}

mod private {
  use super::{HtmlTag, ImportedComponent};

  pub trait Sealed {}
  impl<'a> Sealed for ImportedComponent<'a> {}
  impl<'a> Sealed for HtmlTag<'a> {}
}

/// A marker trait for the component type that [`H`] is supposed to build.
///
/// Can either be `HtmlTag` or `ImportedComponent`.
pub trait HType: private::Sealed {
  #[doc(hidden)]
  fn with_js<T>(&self, f: impl FnOnce(&JsValue) -> T) -> T;
}

impl<'a> HType for ImportedComponent<'a> {
  fn with_js<T>(&self, f: impl FnOnce(&JsValue) -> T) -> T {
    f(&self.as_ref())
  }
}

impl<'a> HType for HtmlTag<'a> {
  fn with_js<T>(&self, f: impl FnOnce(&JsValue) -> T) -> T {
    f(&self.as_ref().into())
  }
}

/// The component builder that powers [`h!`](crate::h!), which provides
/// convenience methods for adding props.
///
/// In case `T` is `HtmlTag`, [`H<T>`] also provides auto-completion for HTML
/// attributes and events.
#[derive(Debug, Clone)]
pub struct H<T: HType> {
  pub(crate) typ: T,
  pub(crate) props: Props,
}

impl<T: HType> H<T> {
  /// Creates a new instance of [`H`]. It is recommended to use the
  /// [`h!`](crate::h!) macro instead.
  pub fn new(typ: T) -> Self {
    Self {
      typ,
      props: Props::new(),
    }
  }

  /// Sets the [React key][key].
  ///
  /// [key]: https://reactjs.org/docs/lists-and-keys.html
  pub fn key(mut self, value: Option<&str>) -> Self {
    self.props = self.props.key(value);
    self
  }

  /// Sets the [React ref][ref] to the given ref container created with the
  /// [`use_js_ref()`](crate::hooks::use_js_ref()) hook.
  ///
  /// [ref]: https://reactjs.org/docs/refs-and-the-dom.html
  pub fn ref_container(
    mut self,
    ref_container: &JsRefContainer<Element>,
  ) -> Self {
    self.props = self.props.ref_container(ref_container);
    self
  }

  /// Sets the [React ref][ref] to the given ref callback.
  ///
  /// [ref]: https://reactjs.org/docs/refs-and-the-dom.html
  pub fn ref_callback(
    mut self,
    ref_callback: &PersistedCallback<Option<Element>>,
  ) -> Self {
    self.props = self.props.ref_callback(ref_callback);
    self
  }

  /// Sets an attribute on the [`VNode`].
  pub fn attr(mut self, key: &str, value: &JsValue) -> Self {
    self.props = self.props.insert(key, value);
    self
  }

  /// Sets a callback value to an attribute on the [`VNode`].
  pub fn attr_callback<U, V>(
    mut self,
    key: &str,
    f: &PersistedCallback<U, V>,
  ) -> Self
  where
    U: FromWasmAbi + 'static,
    V: IntoWasmAbi + 'static,
  {
    self.props = self.props.insert_callback(key, f);
    self
  }

  /// Builds the [`VNode`] and returns it with the given children. Use
  /// [`c!`](crate::c!) for easier construction of the children.
  pub fn build(self, children: VNodeList) -> VNode {
    self
      .typ
      .with_js(|typ| create_element(typ, &self.props, children))
  }
}