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use std::convert::TryInto;

use js_sys::Function;
use serde::{de::DeserializeOwned, Serialize};
use wasm_bindgen::prelude::*;

use crate::ReactObservable;

#[wasm_bindgen(module = "react")]
extern "C" {
    /// Binding to React.useState
    #[wasm_bindgen(js_name = useState)]
    fn js_use_state(initial_value: JsValue) -> js_sys::Array;

    /// Binding to React.useEffect
    #[wasm_bindgen(js_name = useEffect)]
    fn js_use_effect(effect: &Closure<dyn FnMut()>, bindings: js_sys::Array) -> js_sys::Array;

    /// Binding to React.useReducer
    #[wasm_bindgen(js_name = useReducer)]
    fn js_use_reducer(reducer: &Closure<dyn FnMut()>, initial_value: JsValue) -> js_sys::Array;
}

// Duck type for React components
#[wasm_bindgen]
extern "C" {
    pub type ReactComponent;

    #[wasm_bindgen(structural, method)]
    pub fn forceUpdate(this: &ReactComponent);
}

/// Oxidized interface to React.useState
pub fn use_state<T>(initial_value: T) -> (T, impl Fn(T))
where
    T: Serialize + DeserializeOwned,
{
    #[allow(unused_unsafe)]
    let jsa = unsafe { js_use_state(JsValue::from_serde(&initial_value).unwrap()) };

    let current = jsa.get(0).into_serde().unwrap();
    let update: Function = jsa.get(1).try_into().unwrap();

    let cb = move |value: T| {
        // unimplemented!()
        update
            .call1(&JsValue::UNDEFINED, &JsValue::from_serde(&value).unwrap())
            .unwrap();
    };

    (current, cb)
}

// /// Oxidized interface to React.useEffect
// pub fn use_effect<T, E>(effect: E, props: Vec<T>)
// where
//     T: Serialize + DeserializeOwned,
//     E: Fn(T) -> fn(),
// {
//     // #[allow(unused_unsafe)]
//     // let jsa = unsafe { js_use_state(JsValue::from_serde(&initial_value).unwrap()) };

//     // let current = jsa.get(0).into_serde().unwrap();
//     // let update: Function = jsa.get(1).try_into().unwrap();

//     // let cb = move |value: T| {
//     //     // unimplemented!()
//     //     update
//     //         .call1(&JsValue::UNDEFINED, &JsValue::from_serde(&value).unwrap())
//     //         .unwrap();
//     // };

//     // (current, cb)

//     unimplemented!()
// }

// /// Oxidized interface to React.useReducer
// pub fn use_reducer<T, R>(reducer: R, initial_value: T) -> (T, fn())
// where
//     T: Serialize + DeserializeOwned,
//     R: Into<Closure<dyn Fn(T) -> T>>,
// {
//     #[allow(unused_unsafe)]
//     let jsa =
//         unsafe { js_use_reducer(reducer.into(), JsValue::from_serde(&initial_value).unwrap()) };

//     let current = jsa.get(0).into_serde().unwrap();
//     let update: Function = jsa.get(1).try_into().unwrap();

//     let cb = move |value: T| {
//         //     // unimplemented!()
//         update
//             .call1(&JsValue::UNDEFINED, &JsValue::from_serde(&value).unwrap())
//             .unwrap();
//     };

//     // (current, cb)

//     unimplemented!()
// }

// fn forceupdate_reducer(x: usize) -> usize {
//     x + 1
// }
// pub fn use_force_update() {
//     let closure = Closure::wrap(Box::new(|| {}));
//     // let jsa = unsafe {
//     //     js_use_reducer(
//     //         Closure::wrap(Box::new(|x: JsValue| {}))
//     //             .as_ref()
//     //             .unchecked_ref(),
//     //         0.into(),
//     //     )
//     // };

//     let current = jsa.get(0).into_serde().unwrap();
//     let update: Function = jsa.get(1).try_into().unwrap();

//     let cb = move |value: T| {
//         //     // unimplemented!()
//         update
//             .call1(&JsValue::UNDEFINED, &JsValue::from_serde(&value).unwrap())
//             .unwrap();
//     };

//     // (current, cb)
// }